fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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4460 lines
158 KiB
4460 lines
158 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/version_set.h"
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <inttypes.h>
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#include <stdio.h>
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#include <algorithm>
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#include <list>
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#include <map>
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#include <set>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "db/compaction.h"
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#include "db/internal_stats.h"
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "db/memtable.h"
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#include "db/merge_context.h"
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#include "db/merge_helper.h"
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#include "db/pinned_iterators_manager.h"
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#include "db/table_cache.h"
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#include "db/version_builder.h"
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#include "monitoring/file_read_sample.h"
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#include "monitoring/perf_context_imp.h"
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#include "rocksdb/env.h"
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/write_buffer_manager.h"
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#include "table/format.h"
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#include "table/get_context.h"
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#include "table/internal_iterator.h"
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#include "table/merging_iterator.h"
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#include "table/meta_blocks.h"
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#include "table/plain_table_factory.h"
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#include "table/table_reader.h"
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#include "table/two_level_iterator.h"
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#include "util/coding.h"
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#include "util/file_reader_writer.h"
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#include "util/filename.h"
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#include "util/stop_watch.h"
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#include "util/string_util.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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namespace {
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// Find File in LevelFilesBrief data structure
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// Within an index range defined by left and right
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int FindFileInRange(const InternalKeyComparator& icmp,
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const LevelFilesBrief& file_level,
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const Slice& key,
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uint32_t left,
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uint32_t right) {
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auto cmp = [&](const FdWithKeyRange& f, const Slice& k) -> bool {
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return icmp.InternalKeyComparator::Compare(f.largest_key, k) < 0;
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};
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const auto &b = file_level.files;
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return static_cast<int>(std::lower_bound(b + left,
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b + right, key, cmp) - b);
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}
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Status OverlapWithIterator(const Comparator* ucmp,
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const Slice& smallest_user_key,
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const Slice& largest_user_key,
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InternalIterator* iter,
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bool* overlap) {
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InternalKey range_start(smallest_user_key, kMaxSequenceNumber,
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kValueTypeForSeek);
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iter->Seek(range_start.Encode());
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if (!iter->status().ok()) {
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return iter->status();
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}
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*overlap = false;
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if (iter->Valid()) {
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ParsedInternalKey seek_result;
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if (!ParseInternalKey(iter->key(), &seek_result)) {
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return Status::Corruption("DB have corrupted keys");
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}
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if (ucmp->Compare(seek_result.user_key, largest_user_key) <= 0) {
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*overlap = true;
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}
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}
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return iter->status();
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}
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// Class to help choose the next file to search for the particular key.
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// Searches and returns files level by level.
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// We can search level-by-level since entries never hop across
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// levels. Therefore we are guaranteed that if we find data
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// in a smaller level, later levels are irrelevant (unless we
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// are MergeInProgress).
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class FilePicker {
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public:
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FilePicker(std::vector<FileMetaData*>* files, const Slice& user_key,
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const Slice& ikey, autovector<LevelFilesBrief>* file_levels,
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unsigned int num_levels, FileIndexer* file_indexer,
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const Comparator* user_comparator,
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const InternalKeyComparator* internal_comparator)
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: num_levels_(num_levels),
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curr_level_(static_cast<unsigned int>(-1)),
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returned_file_level_(static_cast<unsigned int>(-1)),
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hit_file_level_(static_cast<unsigned int>(-1)),
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search_left_bound_(0),
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search_right_bound_(FileIndexer::kLevelMaxIndex),
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#ifndef NDEBUG
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files_(files),
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#endif
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level_files_brief_(file_levels),
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is_hit_file_last_in_level_(false),
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curr_file_level_(nullptr),
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user_key_(user_key),
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ikey_(ikey),
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file_indexer_(file_indexer),
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user_comparator_(user_comparator),
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internal_comparator_(internal_comparator) {
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#ifdef NDEBUG
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(void)files;
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#endif
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// Setup member variables to search first level.
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search_ended_ = !PrepareNextLevel();
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if (!search_ended_) {
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// Prefetch Level 0 table data to avoid cache miss if possible.
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for (unsigned int i = 0; i < (*level_files_brief_)[0].num_files; ++i) {
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auto* r = (*level_files_brief_)[0].files[i].fd.table_reader;
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if (r) {
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r->Prepare(ikey);
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}
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}
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}
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}
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int GetCurrentLevel() const { return curr_level_; }
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FdWithKeyRange* GetNextFile() {
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while (!search_ended_) { // Loops over different levels.
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while (curr_index_in_curr_level_ < curr_file_level_->num_files) {
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// Loops over all files in current level.
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FdWithKeyRange* f = &curr_file_level_->files[curr_index_in_curr_level_];
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hit_file_level_ = curr_level_;
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is_hit_file_last_in_level_ =
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curr_index_in_curr_level_ == curr_file_level_->num_files - 1;
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int cmp_largest = -1;
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// Do key range filtering of files or/and fractional cascading if:
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// (1) not all the files are in level 0, or
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// (2) there are more than 3 current level files
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// If there are only 3 or less current level files in the system, we skip
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// the key range filtering. In this case, more likely, the system is
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// highly tuned to minimize number of tables queried by each query,
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// so it is unlikely that key range filtering is more efficient than
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// querying the files.
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if (num_levels_ > 1 || curr_file_level_->num_files > 3) {
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// Check if key is within a file's range. If search left bound and
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// right bound point to the same find, we are sure key falls in
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// range.
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assert(
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curr_level_ == 0 ||
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curr_index_in_curr_level_ == start_index_in_curr_level_ ||
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user_comparator_->Compare(user_key_,
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ExtractUserKey(f->smallest_key)) <= 0);
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int cmp_smallest = user_comparator_->Compare(user_key_,
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ExtractUserKey(f->smallest_key));
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if (cmp_smallest >= 0) {
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cmp_largest = user_comparator_->Compare(user_key_,
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ExtractUserKey(f->largest_key));
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}
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// Setup file search bound for the next level based on the
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// comparison results
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if (curr_level_ > 0) {
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file_indexer_->GetNextLevelIndex(curr_level_,
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curr_index_in_curr_level_,
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cmp_smallest, cmp_largest,
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&search_left_bound_,
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&search_right_bound_);
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}
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// Key falls out of current file's range
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if (cmp_smallest < 0 || cmp_largest > 0) {
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if (curr_level_ == 0) {
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++curr_index_in_curr_level_;
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continue;
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} else {
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// Search next level.
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break;
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}
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}
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}
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#ifndef NDEBUG
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// Sanity check to make sure that the files are correctly sorted
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if (prev_file_) {
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if (curr_level_ != 0) {
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int comp_sign = internal_comparator_->Compare(
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prev_file_->largest_key, f->smallest_key);
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assert(comp_sign < 0);
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} else {
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// level == 0, the current file cannot be newer than the previous
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// one. Use compressed data structure, has no attribute seqNo
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assert(curr_index_in_curr_level_ > 0);
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assert(!NewestFirstBySeqNo(files_[0][curr_index_in_curr_level_],
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files_[0][curr_index_in_curr_level_-1]));
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}
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}
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prev_file_ = f;
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#endif
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returned_file_level_ = curr_level_;
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if (curr_level_ > 0 && cmp_largest < 0) {
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// No more files to search in this level.
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search_ended_ = !PrepareNextLevel();
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} else {
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++curr_index_in_curr_level_;
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}
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return f;
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}
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// Start searching next level.
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search_ended_ = !PrepareNextLevel();
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}
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// Search ended.
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return nullptr;
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}
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// getter for current file level
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// for GET_HIT_L0, GET_HIT_L1 & GET_HIT_L2_AND_UP counts
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unsigned int GetHitFileLevel() { return hit_file_level_; }
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// Returns true if the most recent "hit file" (i.e., one returned by
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// GetNextFile()) is at the last index in its level.
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bool IsHitFileLastInLevel() { return is_hit_file_last_in_level_; }
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private:
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unsigned int num_levels_;
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unsigned int curr_level_;
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unsigned int returned_file_level_;
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unsigned int hit_file_level_;
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int32_t search_left_bound_;
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int32_t search_right_bound_;
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#ifndef NDEBUG
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std::vector<FileMetaData*>* files_;
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#endif
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autovector<LevelFilesBrief>* level_files_brief_;
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bool search_ended_;
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bool is_hit_file_last_in_level_;
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LevelFilesBrief* curr_file_level_;
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unsigned int curr_index_in_curr_level_;
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unsigned int start_index_in_curr_level_;
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Slice user_key_;
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Slice ikey_;
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FileIndexer* file_indexer_;
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const Comparator* user_comparator_;
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const InternalKeyComparator* internal_comparator_;
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#ifndef NDEBUG
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FdWithKeyRange* prev_file_;
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#endif
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// Setup local variables to search next level.
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// Returns false if there are no more levels to search.
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bool PrepareNextLevel() {
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curr_level_++;
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while (curr_level_ < num_levels_) {
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curr_file_level_ = &(*level_files_brief_)[curr_level_];
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if (curr_file_level_->num_files == 0) {
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// When current level is empty, the search bound generated from upper
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// level must be [0, -1] or [0, FileIndexer::kLevelMaxIndex] if it is
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// also empty.
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assert(search_left_bound_ == 0);
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assert(search_right_bound_ == -1 ||
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search_right_bound_ == FileIndexer::kLevelMaxIndex);
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// Since current level is empty, it will need to search all files in
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// the next level
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search_left_bound_ = 0;
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search_right_bound_ = FileIndexer::kLevelMaxIndex;
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curr_level_++;
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continue;
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}
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// Some files may overlap each other. We find
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// all files that overlap user_key and process them in order from
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// newest to oldest. In the context of merge-operator, this can occur at
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// any level. Otherwise, it only occurs at Level-0 (since Put/Deletes
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// are always compacted into a single entry).
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int32_t start_index;
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if (curr_level_ == 0) {
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// On Level-0, we read through all files to check for overlap.
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start_index = 0;
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} else {
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// On Level-n (n>=1), files are sorted. Binary search to find the
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// earliest file whose largest key >= ikey. Search left bound and
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// right bound are used to narrow the range.
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if (search_left_bound_ == search_right_bound_) {
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start_index = search_left_bound_;
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} else if (search_left_bound_ < search_right_bound_) {
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if (search_right_bound_ == FileIndexer::kLevelMaxIndex) {
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search_right_bound_ =
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static_cast<int32_t>(curr_file_level_->num_files) - 1;
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}
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start_index =
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FindFileInRange(*internal_comparator_, *curr_file_level_, ikey_,
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static_cast<uint32_t>(search_left_bound_),
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static_cast<uint32_t>(search_right_bound_));
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} else {
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// search_left_bound > search_right_bound, key does not exist in
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// this level. Since no comparison is done in this level, it will
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// need to search all files in the next level.
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search_left_bound_ = 0;
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search_right_bound_ = FileIndexer::kLevelMaxIndex;
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curr_level_++;
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continue;
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}
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}
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start_index_in_curr_level_ = start_index;
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curr_index_in_curr_level_ = start_index;
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#ifndef NDEBUG
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prev_file_ = nullptr;
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#endif
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return true;
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}
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// curr_level_ = num_levels_. So, no more levels to search.
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return false;
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}
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};
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} // anonymous namespace
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VersionStorageInfo::~VersionStorageInfo() { delete[] files_; }
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Version::~Version() {
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assert(refs_ == 0);
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// Remove from linked list
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prev_->next_ = next_;
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next_->prev_ = prev_;
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// Drop references to files
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for (int level = 0; level < storage_info_.num_levels_; level++) {
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for (size_t i = 0; i < storage_info_.files_[level].size(); i++) {
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FileMetaData* f = storage_info_.files_[level][i];
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assert(f->refs > 0);
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f->refs--;
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if (f->refs <= 0) {
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assert(cfd_ != nullptr);
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uint32_t path_id = f->fd.GetPathId();
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assert(path_id < cfd_->ioptions()->cf_paths.size());
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vset_->obsolete_files_.push_back(
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ObsoleteFileInfo(f, cfd_->ioptions()->cf_paths[path_id].path));
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}
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}
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}
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}
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int FindFile(const InternalKeyComparator& icmp,
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const LevelFilesBrief& file_level,
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const Slice& key) {
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return FindFileInRange(icmp, file_level, key, 0,
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static_cast<uint32_t>(file_level.num_files));
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}
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void DoGenerateLevelFilesBrief(LevelFilesBrief* file_level,
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const std::vector<FileMetaData*>& files,
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Arena* arena) {
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assert(file_level);
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assert(arena);
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size_t num = files.size();
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file_level->num_files = num;
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char* mem = arena->AllocateAligned(num * sizeof(FdWithKeyRange));
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file_level->files = new (mem)FdWithKeyRange[num];
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for (size_t i = 0; i < num; i++) {
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Slice smallest_key = files[i]->smallest.Encode();
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Slice largest_key = files[i]->largest.Encode();
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// Copy key slice to sequential memory
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size_t smallest_size = smallest_key.size();
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size_t largest_size = largest_key.size();
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mem = arena->AllocateAligned(smallest_size + largest_size);
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memcpy(mem, smallest_key.data(), smallest_size);
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memcpy(mem + smallest_size, largest_key.data(), largest_size);
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FdWithKeyRange& f = file_level->files[i];
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f.fd = files[i]->fd;
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f.file_metadata = files[i];
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f.smallest_key = Slice(mem, smallest_size);
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f.largest_key = Slice(mem + smallest_size, largest_size);
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}
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}
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static bool AfterFile(const Comparator* ucmp,
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const Slice* user_key, const FdWithKeyRange* f) {
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// nullptr user_key occurs before all keys and is therefore never after *f
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return (user_key != nullptr &&
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ucmp->Compare(*user_key, ExtractUserKey(f->largest_key)) > 0);
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}
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static bool BeforeFile(const Comparator* ucmp,
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const Slice* user_key, const FdWithKeyRange* f) {
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// nullptr user_key occurs after all keys and is therefore never before *f
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return (user_key != nullptr &&
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ucmp->Compare(*user_key, ExtractUserKey(f->smallest_key)) < 0);
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}
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bool SomeFileOverlapsRange(
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const InternalKeyComparator& icmp,
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bool disjoint_sorted_files,
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const LevelFilesBrief& file_level,
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const Slice* smallest_user_key,
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const Slice* largest_user_key) {
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const Comparator* ucmp = icmp.user_comparator();
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if (!disjoint_sorted_files) {
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// Need to check against all files
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for (size_t i = 0; i < file_level.num_files; i++) {
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const FdWithKeyRange* f = &(file_level.files[i]);
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if (AfterFile(ucmp, smallest_user_key, f) ||
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BeforeFile(ucmp, largest_user_key, f)) {
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// No overlap
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} else {
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return true; // Overlap
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}
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}
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return false;
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}
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// Binary search over file list
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uint32_t index = 0;
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if (smallest_user_key != nullptr) {
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// Find the leftmost possible internal key for smallest_user_key
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InternalKey small;
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small.SetMinPossibleForUserKey(*smallest_user_key);
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index = FindFile(icmp, file_level, small.Encode());
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}
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if (index >= file_level.num_files) {
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// beginning of range is after all files, so no overlap.
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return false;
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}
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return !BeforeFile(ucmp, largest_user_key, &file_level.files[index]);
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}
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namespace {
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class LevelIterator final : public InternalIterator {
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public:
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LevelIterator(TableCache* table_cache, const ReadOptions& read_options,
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const EnvOptions& env_options,
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const InternalKeyComparator& icomparator,
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const LevelFilesBrief* flevel,
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const SliceTransform* prefix_extractor, bool should_sample,
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HistogramImpl* file_read_hist, bool for_compaction,
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bool skip_filters, int level, RangeDelAggregator* range_del_agg,
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const std::vector<AtomicCompactionUnitBoundary>*
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compaction_boundaries = nullptr)
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: table_cache_(table_cache),
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read_options_(read_options),
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env_options_(env_options),
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icomparator_(icomparator),
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flevel_(flevel),
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prefix_extractor_(prefix_extractor),
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file_read_hist_(file_read_hist),
|
|
should_sample_(should_sample),
|
|
for_compaction_(for_compaction),
|
|
skip_filters_(skip_filters),
|
|
file_index_(flevel_->num_files),
|
|
level_(level),
|
|
range_del_agg_(range_del_agg),
|
|
pinned_iters_mgr_(nullptr),
|
|
compaction_boundaries_(compaction_boundaries) {
|
|
// Empty level is not supported.
|
|
assert(flevel_ != nullptr && flevel_->num_files > 0);
|
|
}
|
|
|
|
virtual ~LevelIterator() { delete file_iter_.Set(nullptr); }
|
|
|
|
virtual void Seek(const Slice& target) override;
|
|
virtual void SeekForPrev(const Slice& target) override;
|
|
virtual void SeekToFirst() override;
|
|
virtual void SeekToLast() override;
|
|
virtual void Next() override;
|
|
virtual void Prev() override;
|
|
|
|
virtual bool Valid() const override { return file_iter_.Valid(); }
|
|
virtual Slice key() const override {
|
|
assert(Valid());
|
|
return file_iter_.key();
|
|
}
|
|
virtual Slice value() const override {
|
|
assert(Valid());
|
|
return file_iter_.value();
|
|
}
|
|
virtual Status status() const override {
|
|
return file_iter_.iter() ? file_iter_.status() : Status::OK();
|
|
}
|
|
virtual void SetPinnedItersMgr(
|
|
PinnedIteratorsManager* pinned_iters_mgr) override {
|
|
pinned_iters_mgr_ = pinned_iters_mgr;
|
|
if (file_iter_.iter()) {
|
|
file_iter_.SetPinnedItersMgr(pinned_iters_mgr);
|
|
}
|
|
}
|
|
virtual bool IsKeyPinned() const override {
|
|
return pinned_iters_mgr_ && pinned_iters_mgr_->PinningEnabled() &&
|
|
file_iter_.iter() && file_iter_.IsKeyPinned();
|
|
}
|
|
virtual bool IsValuePinned() const override {
|
|
return pinned_iters_mgr_ && pinned_iters_mgr_->PinningEnabled() &&
|
|
file_iter_.iter() && file_iter_.IsValuePinned();
|
|
}
|
|
|
|
private:
|
|
void SkipEmptyFileForward();
|
|
void SkipEmptyFileBackward();
|
|
void SetFileIterator(InternalIterator* iter);
|
|
void InitFileIterator(size_t new_file_index);
|
|
|
|
const Slice& file_smallest_key(size_t file_index) {
|
|
assert(file_index < flevel_->num_files);
|
|
return flevel_->files[file_index].smallest_key;
|
|
}
|
|
|
|
bool KeyReachedUpperBound(const Slice& internal_key) {
|
|
return read_options_.iterate_upper_bound != nullptr &&
|
|
icomparator_.user_comparator()->Compare(
|
|
ExtractUserKey(internal_key),
|
|
*read_options_.iterate_upper_bound) >= 0;
|
|
}
|
|
|
|
InternalIterator* NewFileIterator() {
|
|
assert(file_index_ < flevel_->num_files);
|
|
auto file_meta = flevel_->files[file_index_];
|
|
if (should_sample_) {
|
|
sample_file_read_inc(file_meta.file_metadata);
|
|
}
|
|
|
|
const InternalKey* smallest_compaction_key = nullptr;
|
|
const InternalKey* largest_compaction_key = nullptr;
|
|
if (compaction_boundaries_ != nullptr) {
|
|
smallest_compaction_key = (*compaction_boundaries_)[file_index_].smallest;
|
|
largest_compaction_key = (*compaction_boundaries_)[file_index_].largest;
|
|
}
|
|
return table_cache_->NewIterator(
|
|
read_options_, env_options_, icomparator_, *file_meta.file_metadata,
|
|
range_del_agg_, prefix_extractor_,
|
|
nullptr /* don't need reference to table */,
|
|
file_read_hist_, for_compaction_, nullptr /* arena */, skip_filters_,
|
|
level_, smallest_compaction_key, largest_compaction_key);
|
|
}
|
|
|
|
TableCache* table_cache_;
|
|
const ReadOptions read_options_;
|
|
const EnvOptions& env_options_;
|
|
const InternalKeyComparator& icomparator_;
|
|
const LevelFilesBrief* flevel_;
|
|
mutable FileDescriptor current_value_;
|
|
const SliceTransform* prefix_extractor_;
|
|
|
|
HistogramImpl* file_read_hist_;
|
|
bool should_sample_;
|
|
bool for_compaction_;
|
|
bool skip_filters_;
|
|
size_t file_index_;
|
|
int level_;
|
|
RangeDelAggregator* range_del_agg_;
|
|
IteratorWrapper file_iter_; // May be nullptr
|
|
PinnedIteratorsManager* pinned_iters_mgr_;
|
|
|
|
// To be propagated to RangeDelAggregator in order to safely truncate range
|
|
// tombstones.
|
|
const std::vector<AtomicCompactionUnitBoundary>* compaction_boundaries_;
|
|
};
|
|
|
|
void LevelIterator::Seek(const Slice& target) {
|
|
size_t new_file_index = FindFile(icomparator_, *flevel_, target);
|
|
|
|
InitFileIterator(new_file_index);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.Seek(target);
|
|
}
|
|
SkipEmptyFileForward();
|
|
}
|
|
|
|
void LevelIterator::SeekForPrev(const Slice& target) {
|
|
size_t new_file_index = FindFile(icomparator_, *flevel_, target);
|
|
if (new_file_index >= flevel_->num_files) {
|
|
new_file_index = flevel_->num_files - 1;
|
|
}
|
|
|
|
InitFileIterator(new_file_index);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.SeekForPrev(target);
|
|
SkipEmptyFileBackward();
|
|
}
|
|
}
|
|
|
|
void LevelIterator::SeekToFirst() {
|
|
InitFileIterator(0);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.SeekToFirst();
|
|
}
|
|
SkipEmptyFileForward();
|
|
}
|
|
|
|
void LevelIterator::SeekToLast() {
|
|
InitFileIterator(flevel_->num_files - 1);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.SeekToLast();
|
|
}
|
|
SkipEmptyFileBackward();
|
|
}
|
|
|
|
void LevelIterator::Next() {
|
|
assert(Valid());
|
|
file_iter_.Next();
|
|
SkipEmptyFileForward();
|
|
}
|
|
|
|
void LevelIterator::Prev() {
|
|
assert(Valid());
|
|
file_iter_.Prev();
|
|
SkipEmptyFileBackward();
|
|
}
|
|
|
|
void LevelIterator::SkipEmptyFileForward() {
|
|
while (file_iter_.iter() == nullptr ||
|
|
(!file_iter_.Valid() && file_iter_.status().ok() &&
|
|
!file_iter_.iter()->IsOutOfBound())) {
|
|
// Move to next file
|
|
if (file_index_ >= flevel_->num_files - 1) {
|
|
// Already at the last file
|
|
SetFileIterator(nullptr);
|
|
return;
|
|
}
|
|
if (KeyReachedUpperBound(file_smallest_key(file_index_ + 1))) {
|
|
SetFileIterator(nullptr);
|
|
return;
|
|
}
|
|
InitFileIterator(file_index_ + 1);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.SeekToFirst();
|
|
}
|
|
}
|
|
}
|
|
|
|
void LevelIterator::SkipEmptyFileBackward() {
|
|
while (file_iter_.iter() == nullptr ||
|
|
(!file_iter_.Valid() && file_iter_.status().ok())) {
|
|
// Move to previous file
|
|
if (file_index_ == 0) {
|
|
// Already the first file
|
|
SetFileIterator(nullptr);
|
|
return;
|
|
}
|
|
InitFileIterator(file_index_ - 1);
|
|
if (file_iter_.iter() != nullptr) {
|
|
file_iter_.SeekToLast();
|
|
}
|
|
}
|
|
}
|
|
|
|
void LevelIterator::SetFileIterator(InternalIterator* iter) {
|
|
if (pinned_iters_mgr_ && iter) {
|
|
iter->SetPinnedItersMgr(pinned_iters_mgr_);
|
|
}
|
|
|
|
InternalIterator* old_iter = file_iter_.Set(iter);
|
|
if (pinned_iters_mgr_ && pinned_iters_mgr_->PinningEnabled()) {
|
|
pinned_iters_mgr_->PinIterator(old_iter);
|
|
} else {
|
|
delete old_iter;
|
|
}
|
|
}
|
|
|
|
void LevelIterator::InitFileIterator(size_t new_file_index) {
|
|
if (new_file_index >= flevel_->num_files) {
|
|
file_index_ = new_file_index;
|
|
SetFileIterator(nullptr);
|
|
return;
|
|
} else {
|
|
// If the file iterator shows incomplete, we try it again if users seek
|
|
// to the same file, as this time we may go to a different data block
|
|
// which is cached in block cache.
|
|
//
|
|
if (file_iter_.iter() != nullptr && !file_iter_.status().IsIncomplete() &&
|
|
new_file_index == file_index_) {
|
|
// file_iter_ is already constructed with this iterator, so
|
|
// no need to change anything
|
|
} else {
|
|
file_index_ = new_file_index;
|
|
InternalIterator* iter = NewFileIterator();
|
|
SetFileIterator(iter);
|
|
}
|
|
}
|
|
}
|
|
|
|
// A wrapper of version builder which references the current version in
|
|
// constructor and unref it in the destructor.
|
|
// Both of the constructor and destructor need to be called inside DB Mutex.
|
|
class BaseReferencedVersionBuilder {
|
|
public:
|
|
explicit BaseReferencedVersionBuilder(ColumnFamilyData* cfd)
|
|
: version_builder_(new VersionBuilder(
|
|
cfd->current()->version_set()->env_options(), cfd->table_cache(),
|
|
cfd->current()->storage_info(), cfd->ioptions()->info_log)),
|
|
version_(cfd->current()) {
|
|
version_->Ref();
|
|
}
|
|
~BaseReferencedVersionBuilder() {
|
|
delete version_builder_;
|
|
version_->Unref();
|
|
}
|
|
VersionBuilder* version_builder() { return version_builder_; }
|
|
|
|
private:
|
|
VersionBuilder* version_builder_;
|
|
Version* version_;
|
|
};
|
|
} // anonymous namespace
|
|
|
|
Status Version::GetTableProperties(std::shared_ptr<const TableProperties>* tp,
|
|
const FileMetaData* file_meta,
|
|
const std::string* fname) const {
|
|
auto table_cache = cfd_->table_cache();
|
|
auto ioptions = cfd_->ioptions();
|
|
Status s = table_cache->GetTableProperties(
|
|
env_options_, cfd_->internal_comparator(), file_meta->fd, tp,
|
|
mutable_cf_options_.prefix_extractor.get(), true /* no io */);
|
|
if (s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// We only ignore error type `Incomplete` since it's by design that we
|
|
// disallow table when it's not in table cache.
|
|
if (!s.IsIncomplete()) {
|
|
return s;
|
|
}
|
|
|
|
// 2. Table is not present in table cache, we'll read the table properties
|
|
// directly from the properties block in the file.
|
|
std::unique_ptr<RandomAccessFile> file;
|
|
std::string file_name;
|
|
if (fname != nullptr) {
|
|
file_name = *fname;
|
|
} else {
|
|
file_name =
|
|
TableFileName(ioptions->cf_paths, file_meta->fd.GetNumber(),
|
|
file_meta->fd.GetPathId());
|
|
}
|
|
s = ioptions->env->NewRandomAccessFile(file_name, &file, env_options_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TableProperties* raw_table_properties;
|
|
// By setting the magic number to kInvalidTableMagicNumber, we can by
|
|
// pass the magic number check in the footer.
|
|
std::unique_ptr<RandomAccessFileReader> file_reader(
|
|
new RandomAccessFileReader(
|
|
std::move(file), file_name, nullptr /* env */, nullptr /* stats */,
|
|
0 /* hist_type */, nullptr /* file_read_hist */,
|
|
nullptr /* rate_limiter */, false /* for_compaction*/,
|
|
ioptions->listeners));
|
|
s = ReadTableProperties(
|
|
file_reader.get(), file_meta->fd.GetFileSize(),
|
|
Footer::kInvalidTableMagicNumber /* table's magic number */, *ioptions,
|
|
&raw_table_properties, false /* compression_type_missing */);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
RecordTick(ioptions->statistics, NUMBER_DIRECT_LOAD_TABLE_PROPERTIES);
|
|
|
|
*tp = std::shared_ptr<const TableProperties>(raw_table_properties);
|
|
return s;
|
|
}
|
|
|
|
Status Version::GetPropertiesOfAllTables(TablePropertiesCollection* props) {
|
|
Status s;
|
|
for (int level = 0; level < storage_info_.num_levels_; level++) {
|
|
s = GetPropertiesOfAllTables(props, level);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status Version::GetPropertiesOfAllTables(TablePropertiesCollection* props,
|
|
int level) {
|
|
for (const auto& file_meta : storage_info_.files_[level]) {
|
|
auto fname =
|
|
TableFileName(cfd_->ioptions()->cf_paths, file_meta->fd.GetNumber(),
|
|
file_meta->fd.GetPathId());
|
|
// 1. If the table is already present in table cache, load table
|
|
// properties from there.
|
|
std::shared_ptr<const TableProperties> table_properties;
|
|
Status s = GetTableProperties(&table_properties, file_meta, &fname);
|
|
if (s.ok()) {
|
|
props->insert({fname, table_properties});
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status Version::GetPropertiesOfTablesInRange(
|
|
const Range* range, std::size_t n, TablePropertiesCollection* props) const {
|
|
for (int level = 0; level < storage_info_.num_non_empty_levels(); level++) {
|
|
for (decltype(n) i = 0; i < n; i++) {
|
|
// Convert user_key into a corresponding internal key.
|
|
InternalKey k1(range[i].start, kMaxSequenceNumber, kValueTypeForSeek);
|
|
InternalKey k2(range[i].limit, kMaxSequenceNumber, kValueTypeForSeek);
|
|
std::vector<FileMetaData*> files;
|
|
storage_info_.GetOverlappingInputs(level, &k1, &k2, &files, -1, nullptr,
|
|
false);
|
|
for (const auto& file_meta : files) {
|
|
auto fname =
|
|
TableFileName(cfd_->ioptions()->cf_paths,
|
|
file_meta->fd.GetNumber(), file_meta->fd.GetPathId());
|
|
if (props->count(fname) == 0) {
|
|
// 1. If the table is already present in table cache, load table
|
|
// properties from there.
|
|
std::shared_ptr<const TableProperties> table_properties;
|
|
Status s = GetTableProperties(&table_properties, file_meta, &fname);
|
|
if (s.ok()) {
|
|
props->insert({fname, table_properties});
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status Version::GetAggregatedTableProperties(
|
|
std::shared_ptr<const TableProperties>* tp, int level) {
|
|
TablePropertiesCollection props;
|
|
Status s;
|
|
if (level < 0) {
|
|
s = GetPropertiesOfAllTables(&props);
|
|
} else {
|
|
s = GetPropertiesOfAllTables(&props, level);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
auto* new_tp = new TableProperties();
|
|
for (const auto& item : props) {
|
|
new_tp->Add(*item.second);
|
|
}
|
|
tp->reset(new_tp);
|
|
return Status::OK();
|
|
}
|
|
|
|
size_t Version::GetMemoryUsageByTableReaders() {
|
|
size_t total_usage = 0;
|
|
for (auto& file_level : storage_info_.level_files_brief_) {
|
|
for (size_t i = 0; i < file_level.num_files; i++) {
|
|
total_usage += cfd_->table_cache()->GetMemoryUsageByTableReader(
|
|
env_options_, cfd_->internal_comparator(), file_level.files[i].fd,
|
|
mutable_cf_options_.prefix_extractor.get());
|
|
}
|
|
}
|
|
return total_usage;
|
|
}
|
|
|
|
void Version::GetColumnFamilyMetaData(ColumnFamilyMetaData* cf_meta) {
|
|
assert(cf_meta);
|
|
assert(cfd_);
|
|
|
|
cf_meta->name = cfd_->GetName();
|
|
cf_meta->size = 0;
|
|
cf_meta->file_count = 0;
|
|
cf_meta->levels.clear();
|
|
|
|
auto* ioptions = cfd_->ioptions();
|
|
auto* vstorage = storage_info();
|
|
|
|
for (int level = 0; level < cfd_->NumberLevels(); level++) {
|
|
uint64_t level_size = 0;
|
|
cf_meta->file_count += vstorage->LevelFiles(level).size();
|
|
std::vector<SstFileMetaData> files;
|
|
for (const auto& file : vstorage->LevelFiles(level)) {
|
|
uint32_t path_id = file->fd.GetPathId();
|
|
std::string file_path;
|
|
if (path_id < ioptions->cf_paths.size()) {
|
|
file_path = ioptions->cf_paths[path_id].path;
|
|
} else {
|
|
assert(!ioptions->cf_paths.empty());
|
|
file_path = ioptions->cf_paths.back().path;
|
|
}
|
|
files.emplace_back(SstFileMetaData{
|
|
MakeTableFileName("", file->fd.GetNumber()),
|
|
file_path,
|
|
static_cast<size_t>(file->fd.GetFileSize()),
|
|
file->fd.smallest_seqno,
|
|
file->fd.largest_seqno,
|
|
file->smallest.user_key().ToString(),
|
|
file->largest.user_key().ToString(),
|
|
file->stats.num_reads_sampled.load(std::memory_order_relaxed),
|
|
file->being_compacted});
|
|
level_size += file->fd.GetFileSize();
|
|
}
|
|
cf_meta->levels.emplace_back(
|
|
level, level_size, std::move(files));
|
|
cf_meta->size += level_size;
|
|
}
|
|
}
|
|
|
|
uint64_t Version::GetSstFilesSize() {
|
|
uint64_t sst_files_size = 0;
|
|
for (int level = 0; level < storage_info_.num_levels_; level++) {
|
|
for (const auto& file_meta : storage_info_.LevelFiles(level)) {
|
|
sst_files_size += file_meta->fd.GetFileSize();
|
|
}
|
|
}
|
|
return sst_files_size;
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::GetEstimatedActiveKeys() const {
|
|
// Estimation will be inaccurate when:
|
|
// (1) there exist merge keys
|
|
// (2) keys are directly overwritten
|
|
// (3) deletion on non-existing keys
|
|
// (4) low number of samples
|
|
if (current_num_samples_ == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (current_num_non_deletions_ <= current_num_deletions_) {
|
|
return 0;
|
|
}
|
|
|
|
uint64_t est = current_num_non_deletions_ - current_num_deletions_;
|
|
|
|
uint64_t file_count = 0;
|
|
for (int level = 0; level < num_levels_; ++level) {
|
|
file_count += files_[level].size();
|
|
}
|
|
|
|
if (current_num_samples_ < file_count) {
|
|
// casting to avoid overflowing
|
|
return
|
|
static_cast<uint64_t>(
|
|
(est * static_cast<double>(file_count) / current_num_samples_)
|
|
);
|
|
} else {
|
|
return est;
|
|
}
|
|
}
|
|
|
|
double VersionStorageInfo::GetEstimatedCompressionRatioAtLevel(
|
|
int level) const {
|
|
assert(level < num_levels_);
|
|
uint64_t sum_file_size_bytes = 0;
|
|
uint64_t sum_data_size_bytes = 0;
|
|
for (auto* file_meta : files_[level]) {
|
|
sum_file_size_bytes += file_meta->fd.GetFileSize();
|
|
sum_data_size_bytes += file_meta->raw_key_size + file_meta->raw_value_size;
|
|
}
|
|
if (sum_file_size_bytes == 0) {
|
|
return -1.0;
|
|
}
|
|
return static_cast<double>(sum_data_size_bytes) / sum_file_size_bytes;
|
|
}
|
|
|
|
void Version::AddIterators(const ReadOptions& read_options,
|
|
const EnvOptions& soptions,
|
|
MergeIteratorBuilder* merge_iter_builder,
|
|
RangeDelAggregator* range_del_agg) {
|
|
assert(storage_info_.finalized_);
|
|
|
|
for (int level = 0; level < storage_info_.num_non_empty_levels(); level++) {
|
|
AddIteratorsForLevel(read_options, soptions, merge_iter_builder, level,
|
|
range_del_agg);
|
|
}
|
|
}
|
|
|
|
void Version::AddIteratorsForLevel(const ReadOptions& read_options,
|
|
const EnvOptions& soptions,
|
|
MergeIteratorBuilder* merge_iter_builder,
|
|
int level,
|
|
RangeDelAggregator* range_del_agg) {
|
|
assert(storage_info_.finalized_);
|
|
if (level >= storage_info_.num_non_empty_levels()) {
|
|
// This is an empty level
|
|
return;
|
|
} else if (storage_info_.LevelFilesBrief(level).num_files == 0) {
|
|
// No files in this level
|
|
return;
|
|
}
|
|
|
|
bool should_sample = should_sample_file_read();
|
|
|
|
auto* arena = merge_iter_builder->GetArena();
|
|
if (level == 0) {
|
|
// Merge all level zero files together since they may overlap
|
|
for (size_t i = 0; i < storage_info_.LevelFilesBrief(0).num_files; i++) {
|
|
const auto& file = storage_info_.LevelFilesBrief(0).files[i];
|
|
merge_iter_builder->AddIterator(cfd_->table_cache()->NewIterator(
|
|
read_options, soptions, cfd_->internal_comparator(), *file.file_metadata,
|
|
range_del_agg, mutable_cf_options_.prefix_extractor.get(), nullptr,
|
|
cfd_->internal_stats()->GetFileReadHist(0), false, arena,
|
|
false /* skip_filters */, 0 /* level */));
|
|
}
|
|
if (should_sample) {
|
|
// Count ones for every L0 files. This is done per iterator creation
|
|
// rather than Seek(), while files in other levels are recored per seek.
|
|
// If users execute one range query per iterator, there may be some
|
|
// discrepancy here.
|
|
for (FileMetaData* meta : storage_info_.LevelFiles(0)) {
|
|
sample_file_read_inc(meta);
|
|
}
|
|
}
|
|
} else if (storage_info_.LevelFilesBrief(level).num_files > 0) {
|
|
// For levels > 0, we can use a concatenating iterator that sequentially
|
|
// walks through the non-overlapping files in the level, opening them
|
|
// lazily.
|
|
auto* mem = arena->AllocateAligned(sizeof(LevelIterator));
|
|
merge_iter_builder->AddIterator(new (mem) LevelIterator(
|
|
cfd_->table_cache(), read_options, soptions,
|
|
cfd_->internal_comparator(), &storage_info_.LevelFilesBrief(level),
|
|
mutable_cf_options_.prefix_extractor.get(), should_sample_file_read(),
|
|
cfd_->internal_stats()->GetFileReadHist(level),
|
|
false /* for_compaction */, IsFilterSkipped(level), level,
|
|
range_del_agg));
|
|
}
|
|
}
|
|
|
|
Status Version::OverlapWithLevelIterator(const ReadOptions& read_options,
|
|
const EnvOptions& env_options,
|
|
const Slice& smallest_user_key,
|
|
const Slice& largest_user_key,
|
|
int level, bool* overlap) {
|
|
assert(storage_info_.finalized_);
|
|
|
|
auto icmp = cfd_->internal_comparator();
|
|
auto ucmp = icmp.user_comparator();
|
|
|
|
Arena arena;
|
|
Status status;
|
|
RangeDelAggregator range_del_agg(icmp, {}, false);
|
|
|
|
*overlap = false;
|
|
|
|
if (level == 0) {
|
|
for (size_t i = 0; i < storage_info_.LevelFilesBrief(0).num_files; i++) {
|
|
const auto file = &storage_info_.LevelFilesBrief(0).files[i];
|
|
if (AfterFile(ucmp, &smallest_user_key, file) ||
|
|
BeforeFile(ucmp, &largest_user_key, file)) {
|
|
continue;
|
|
}
|
|
ScopedArenaIterator iter(cfd_->table_cache()->NewIterator(
|
|
read_options, env_options, cfd_->internal_comparator(), *file->file_metadata,
|
|
&range_del_agg, mutable_cf_options_.prefix_extractor.get(), nullptr,
|
|
cfd_->internal_stats()->GetFileReadHist(0), false, &arena,
|
|
false /* skip_filters */, 0 /* level */));
|
|
status = OverlapWithIterator(
|
|
ucmp, smallest_user_key, largest_user_key, iter.get(), overlap);
|
|
if (!status.ok() || *overlap) {
|
|
break;
|
|
}
|
|
}
|
|
} else if (storage_info_.LevelFilesBrief(level).num_files > 0) {
|
|
auto mem = arena.AllocateAligned(sizeof(LevelIterator));
|
|
ScopedArenaIterator iter(new (mem) LevelIterator(
|
|
cfd_->table_cache(), read_options, env_options,
|
|
cfd_->internal_comparator(), &storage_info_.LevelFilesBrief(level),
|
|
mutable_cf_options_.prefix_extractor.get(), should_sample_file_read(),
|
|
cfd_->internal_stats()->GetFileReadHist(level),
|
|
false /* for_compaction */, IsFilterSkipped(level), level,
|
|
&range_del_agg));
|
|
status = OverlapWithIterator(
|
|
ucmp, smallest_user_key, largest_user_key, iter.get(), overlap);
|
|
}
|
|
|
|
if (status.ok() && *overlap == false &&
|
|
range_del_agg.IsRangeOverlapped(smallest_user_key, largest_user_key)) {
|
|
*overlap = true;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
VersionStorageInfo::VersionStorageInfo(
|
|
const InternalKeyComparator* internal_comparator,
|
|
const Comparator* user_comparator, int levels,
|
|
CompactionStyle compaction_style, VersionStorageInfo* ref_vstorage,
|
|
bool _force_consistency_checks)
|
|
: internal_comparator_(internal_comparator),
|
|
user_comparator_(user_comparator),
|
|
// cfd is nullptr if Version is dummy
|
|
num_levels_(levels),
|
|
num_non_empty_levels_(0),
|
|
file_indexer_(user_comparator),
|
|
compaction_style_(compaction_style),
|
|
files_(new std::vector<FileMetaData*>[num_levels_]),
|
|
base_level_(num_levels_ == 1 ? -1 : 1),
|
|
level_multiplier_(0.0),
|
|
files_by_compaction_pri_(num_levels_),
|
|
level0_non_overlapping_(false),
|
|
next_file_to_compact_by_size_(num_levels_),
|
|
compaction_score_(num_levels_),
|
|
compaction_level_(num_levels_),
|
|
l0_delay_trigger_count_(0),
|
|
accumulated_file_size_(0),
|
|
accumulated_raw_key_size_(0),
|
|
accumulated_raw_value_size_(0),
|
|
accumulated_num_non_deletions_(0),
|
|
accumulated_num_deletions_(0),
|
|
current_num_non_deletions_(0),
|
|
current_num_deletions_(0),
|
|
current_num_samples_(0),
|
|
estimated_compaction_needed_bytes_(0),
|
|
finalized_(false),
|
|
force_consistency_checks_(_force_consistency_checks) {
|
|
if (ref_vstorage != nullptr) {
|
|
accumulated_file_size_ = ref_vstorage->accumulated_file_size_;
|
|
accumulated_raw_key_size_ = ref_vstorage->accumulated_raw_key_size_;
|
|
accumulated_raw_value_size_ = ref_vstorage->accumulated_raw_value_size_;
|
|
accumulated_num_non_deletions_ =
|
|
ref_vstorage->accumulated_num_non_deletions_;
|
|
accumulated_num_deletions_ = ref_vstorage->accumulated_num_deletions_;
|
|
current_num_non_deletions_ = ref_vstorage->current_num_non_deletions_;
|
|
current_num_deletions_ = ref_vstorage->current_num_deletions_;
|
|
current_num_samples_ = ref_vstorage->current_num_samples_;
|
|
oldest_snapshot_seqnum_ = ref_vstorage->oldest_snapshot_seqnum_;
|
|
}
|
|
}
|
|
|
|
Version::Version(ColumnFamilyData* column_family_data, VersionSet* vset,
|
|
const EnvOptions& env_opt,
|
|
const MutableCFOptions mutable_cf_options,
|
|
uint64_t version_number)
|
|
: env_(vset->env_),
|
|
cfd_(column_family_data),
|
|
info_log_((cfd_ == nullptr) ? nullptr : cfd_->ioptions()->info_log),
|
|
db_statistics_((cfd_ == nullptr) ? nullptr
|
|
: cfd_->ioptions()->statistics),
|
|
table_cache_((cfd_ == nullptr) ? nullptr : cfd_->table_cache()),
|
|
merge_operator_((cfd_ == nullptr) ? nullptr
|
|
: cfd_->ioptions()->merge_operator),
|
|
storage_info_(
|
|
(cfd_ == nullptr) ? nullptr : &cfd_->internal_comparator(),
|
|
(cfd_ == nullptr) ? nullptr : cfd_->user_comparator(),
|
|
cfd_ == nullptr ? 0 : cfd_->NumberLevels(),
|
|
cfd_ == nullptr ? kCompactionStyleLevel
|
|
: cfd_->ioptions()->compaction_style,
|
|
(cfd_ == nullptr || cfd_->current() == nullptr)
|
|
? nullptr
|
|
: cfd_->current()->storage_info(),
|
|
cfd_ == nullptr ? false : cfd_->ioptions()->force_consistency_checks),
|
|
vset_(vset),
|
|
next_(this),
|
|
prev_(this),
|
|
refs_(0),
|
|
env_options_(env_opt),
|
|
mutable_cf_options_(mutable_cf_options),
|
|
version_number_(version_number) {}
|
|
|
|
void Version::Get(const ReadOptions& read_options, const LookupKey& k,
|
|
PinnableSlice* value, Status* status,
|
|
MergeContext* merge_context,
|
|
SequenceNumber* max_covering_tombstone_seq, bool* value_found,
|
|
bool* key_exists, SequenceNumber* seq, ReadCallback* callback,
|
|
bool* is_blob) {
|
|
Slice ikey = k.internal_key();
|
|
Slice user_key = k.user_key();
|
|
|
|
assert(status->ok() || status->IsMergeInProgress());
|
|
|
|
if (key_exists != nullptr) {
|
|
// will falsify below if not found
|
|
*key_exists = true;
|
|
}
|
|
|
|
PinnedIteratorsManager pinned_iters_mgr;
|
|
GetContext get_context(
|
|
user_comparator(), merge_operator_, info_log_, db_statistics_,
|
|
status->ok() ? GetContext::kNotFound : GetContext::kMerge, user_key,
|
|
value, value_found, merge_context, max_covering_tombstone_seq, this->env_,
|
|
seq, merge_operator_ ? &pinned_iters_mgr : nullptr, callback, is_blob);
|
|
|
|
// Pin blocks that we read to hold merge operands
|
|
if (merge_operator_) {
|
|
pinned_iters_mgr.StartPinning();
|
|
}
|
|
|
|
FilePicker fp(
|
|
storage_info_.files_, user_key, ikey, &storage_info_.level_files_brief_,
|
|
storage_info_.num_non_empty_levels_, &storage_info_.file_indexer_,
|
|
user_comparator(), internal_comparator());
|
|
FdWithKeyRange* f = fp.GetNextFile();
|
|
|
|
while (f != nullptr) {
|
|
if (get_context.sample()) {
|
|
sample_file_read_inc(f->file_metadata);
|
|
}
|
|
|
|
*status = table_cache_->Get(
|
|
read_options, *internal_comparator(), *f->file_metadata, ikey,
|
|
&get_context, mutable_cf_options_.prefix_extractor.get(),
|
|
cfd_->internal_stats()->GetFileReadHist(fp.GetHitFileLevel()),
|
|
IsFilterSkipped(static_cast<int>(fp.GetHitFileLevel()),
|
|
fp.IsHitFileLastInLevel()),
|
|
fp.GetCurrentLevel());
|
|
// TODO: examine the behavior for corrupted key
|
|
if (!status->ok()) {
|
|
return;
|
|
}
|
|
|
|
// report the counters before returning
|
|
if (get_context.State() != GetContext::kNotFound &&
|
|
get_context.State() != GetContext::kMerge &&
|
|
db_statistics_ != nullptr) {
|
|
get_context.ReportCounters();
|
|
}
|
|
switch (get_context.State()) {
|
|
case GetContext::kNotFound:
|
|
// Keep searching in other files
|
|
break;
|
|
case GetContext::kMerge:
|
|
break;
|
|
case GetContext::kFound:
|
|
if (fp.GetHitFileLevel() == 0) {
|
|
RecordTick(db_statistics_, GET_HIT_L0);
|
|
} else if (fp.GetHitFileLevel() == 1) {
|
|
RecordTick(db_statistics_, GET_HIT_L1);
|
|
} else if (fp.GetHitFileLevel() >= 2) {
|
|
RecordTick(db_statistics_, GET_HIT_L2_AND_UP);
|
|
}
|
|
return;
|
|
case GetContext::kDeleted:
|
|
// Use empty error message for speed
|
|
*status = Status::NotFound();
|
|
return;
|
|
case GetContext::kCorrupt:
|
|
*status = Status::Corruption("corrupted key for ", user_key);
|
|
return;
|
|
case GetContext::kBlobIndex:
|
|
ROCKS_LOG_ERROR(info_log_, "Encounter unexpected blob index.");
|
|
*status = Status::NotSupported(
|
|
"Encounter unexpected blob index. Please open DB with "
|
|
"rocksdb::blob_db::BlobDB instead.");
|
|
return;
|
|
}
|
|
f = fp.GetNextFile();
|
|
}
|
|
|
|
if (db_statistics_ != nullptr) {
|
|
get_context.ReportCounters();
|
|
}
|
|
if (GetContext::kMerge == get_context.State()) {
|
|
if (!merge_operator_) {
|
|
*status = Status::InvalidArgument(
|
|
"merge_operator is not properly initialized.");
|
|
return;
|
|
}
|
|
// merge_operands are in saver and we hit the beginning of the key history
|
|
// do a final merge of nullptr and operands;
|
|
std::string* str_value = value != nullptr ? value->GetSelf() : nullptr;
|
|
*status = MergeHelper::TimedFullMerge(
|
|
merge_operator_, user_key, nullptr, merge_context->GetOperands(),
|
|
str_value, info_log_, db_statistics_, env_,
|
|
nullptr /* result_operand */, true);
|
|
if (LIKELY(value != nullptr)) {
|
|
value->PinSelf();
|
|
}
|
|
} else {
|
|
if (key_exists != nullptr) {
|
|
*key_exists = false;
|
|
}
|
|
*status = Status::NotFound(); // Use an empty error message for speed
|
|
}
|
|
}
|
|
|
|
bool Version::IsFilterSkipped(int level, bool is_file_last_in_level) {
|
|
// Reaching the bottom level implies misses at all upper levels, so we'll
|
|
// skip checking the filters when we predict a hit.
|
|
return cfd_->ioptions()->optimize_filters_for_hits &&
|
|
(level > 0 || is_file_last_in_level) &&
|
|
level == storage_info_.num_non_empty_levels() - 1;
|
|
}
|
|
|
|
void VersionStorageInfo::GenerateLevelFilesBrief() {
|
|
level_files_brief_.resize(num_non_empty_levels_);
|
|
for (int level = 0; level < num_non_empty_levels_; level++) {
|
|
DoGenerateLevelFilesBrief(
|
|
&level_files_brief_[level], files_[level], &arena_);
|
|
}
|
|
}
|
|
|
|
void Version::PrepareApply(
|
|
const MutableCFOptions& mutable_cf_options,
|
|
bool update_stats) {
|
|
UpdateAccumulatedStats(update_stats);
|
|
storage_info_.UpdateNumNonEmptyLevels();
|
|
storage_info_.CalculateBaseBytes(*cfd_->ioptions(), mutable_cf_options);
|
|
storage_info_.UpdateFilesByCompactionPri(cfd_->ioptions()->compaction_pri);
|
|
storage_info_.GenerateFileIndexer();
|
|
storage_info_.GenerateLevelFilesBrief();
|
|
storage_info_.GenerateLevel0NonOverlapping();
|
|
storage_info_.GenerateBottommostFiles();
|
|
}
|
|
|
|
bool Version::MaybeInitializeFileMetaData(FileMetaData* file_meta) {
|
|
if (file_meta->init_stats_from_file ||
|
|
file_meta->compensated_file_size > 0) {
|
|
return false;
|
|
}
|
|
std::shared_ptr<const TableProperties> tp;
|
|
Status s = GetTableProperties(&tp, file_meta);
|
|
file_meta->init_stats_from_file = true;
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(vset_->db_options_->info_log,
|
|
"Unable to load table properties for file %" PRIu64
|
|
" --- %s\n",
|
|
file_meta->fd.GetNumber(), s.ToString().c_str());
|
|
return false;
|
|
}
|
|
if (tp.get() == nullptr) return false;
|
|
file_meta->num_entries = tp->num_entries;
|
|
file_meta->num_deletions = GetDeletedKeys(tp->user_collected_properties);
|
|
file_meta->raw_value_size = tp->raw_value_size;
|
|
file_meta->raw_key_size = tp->raw_key_size;
|
|
|
|
return true;
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateAccumulatedStats(FileMetaData* file_meta) {
|
|
assert(file_meta->init_stats_from_file);
|
|
accumulated_file_size_ += file_meta->fd.GetFileSize();
|
|
accumulated_raw_key_size_ += file_meta->raw_key_size;
|
|
accumulated_raw_value_size_ += file_meta->raw_value_size;
|
|
accumulated_num_non_deletions_ +=
|
|
file_meta->num_entries - file_meta->num_deletions;
|
|
accumulated_num_deletions_ += file_meta->num_deletions;
|
|
|
|
current_num_non_deletions_ +=
|
|
file_meta->num_entries - file_meta->num_deletions;
|
|
current_num_deletions_ += file_meta->num_deletions;
|
|
current_num_samples_++;
|
|
}
|
|
|
|
void VersionStorageInfo::RemoveCurrentStats(FileMetaData* file_meta) {
|
|
if (file_meta->init_stats_from_file) {
|
|
current_num_non_deletions_ -=
|
|
file_meta->num_entries - file_meta->num_deletions;
|
|
current_num_deletions_ -= file_meta->num_deletions;
|
|
current_num_samples_--;
|
|
}
|
|
}
|
|
|
|
void Version::UpdateAccumulatedStats(bool update_stats) {
|
|
if (update_stats) {
|
|
// maximum number of table properties loaded from files.
|
|
const int kMaxInitCount = 20;
|
|
int init_count = 0;
|
|
// here only the first kMaxInitCount files which haven't been
|
|
// initialized from file will be updated with num_deletions.
|
|
// The motivation here is to cap the maximum I/O per Version creation.
|
|
// The reason for choosing files from lower-level instead of higher-level
|
|
// is that such design is able to propagate the initialization from
|
|
// lower-level to higher-level: When the num_deletions of lower-level
|
|
// files are updated, it will make the lower-level files have accurate
|
|
// compensated_file_size, making lower-level to higher-level compaction
|
|
// will be triggered, which creates higher-level files whose num_deletions
|
|
// will be updated here.
|
|
for (int level = 0;
|
|
level < storage_info_.num_levels_ && init_count < kMaxInitCount;
|
|
++level) {
|
|
for (auto* file_meta : storage_info_.files_[level]) {
|
|
if (MaybeInitializeFileMetaData(file_meta)) {
|
|
// each FileMeta will be initialized only once.
|
|
storage_info_.UpdateAccumulatedStats(file_meta);
|
|
// when option "max_open_files" is -1, all the file metadata has
|
|
// already been read, so MaybeInitializeFileMetaData() won't incur
|
|
// any I/O cost. "max_open_files=-1" means that the table cache passed
|
|
// to the VersionSet and then to the ColumnFamilySet has a size of
|
|
// TableCache::kInfiniteCapacity
|
|
if (vset_->GetColumnFamilySet()->get_table_cache()->GetCapacity() ==
|
|
TableCache::kInfiniteCapacity) {
|
|
continue;
|
|
}
|
|
if (++init_count >= kMaxInitCount) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// In case all sampled-files contain only deletion entries, then we
|
|
// load the table-property of a file in higher-level to initialize
|
|
// that value.
|
|
for (int level = storage_info_.num_levels_ - 1;
|
|
storage_info_.accumulated_raw_value_size_ == 0 && level >= 0;
|
|
--level) {
|
|
for (int i = static_cast<int>(storage_info_.files_[level].size()) - 1;
|
|
storage_info_.accumulated_raw_value_size_ == 0 && i >= 0; --i) {
|
|
if (MaybeInitializeFileMetaData(storage_info_.files_[level][i])) {
|
|
storage_info_.UpdateAccumulatedStats(storage_info_.files_[level][i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
storage_info_.ComputeCompensatedSizes();
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeCompensatedSizes() {
|
|
static const int kDeletionWeightOnCompaction = 2;
|
|
uint64_t average_value_size = GetAverageValueSize();
|
|
|
|
// compute the compensated size
|
|
for (int level = 0; level < num_levels_; level++) {
|
|
for (auto* file_meta : files_[level]) {
|
|
// Here we only compute compensated_file_size for those file_meta
|
|
// which compensated_file_size is uninitialized (== 0). This is true only
|
|
// for files that have been created right now and no other thread has
|
|
// access to them. That's why we can safely mutate compensated_file_size.
|
|
if (file_meta->compensated_file_size == 0) {
|
|
file_meta->compensated_file_size = file_meta->fd.GetFileSize();
|
|
// Here we only boost the size of deletion entries of a file only
|
|
// when the number of deletion entries is greater than the number of
|
|
// non-deletion entries in the file. The motivation here is that in
|
|
// a stable workload, the number of deletion entries should be roughly
|
|
// equal to the number of non-deletion entries. If we compensate the
|
|
// size of deletion entries in a stable workload, the deletion
|
|
// compensation logic might introduce unwanted effet which changes the
|
|
// shape of LSM tree.
|
|
if (file_meta->num_deletions * 2 >= file_meta->num_entries) {
|
|
file_meta->compensated_file_size +=
|
|
(file_meta->num_deletions * 2 - file_meta->num_entries) *
|
|
average_value_size * kDeletionWeightOnCompaction;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int VersionStorageInfo::MaxInputLevel() const {
|
|
if (compaction_style_ == kCompactionStyleLevel) {
|
|
return num_levels() - 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int VersionStorageInfo::MaxOutputLevel(bool allow_ingest_behind) const {
|
|
if (allow_ingest_behind) {
|
|
assert(num_levels() > 1);
|
|
return num_levels() - 2;
|
|
}
|
|
return num_levels() - 1;
|
|
}
|
|
|
|
void VersionStorageInfo::EstimateCompactionBytesNeeded(
|
|
const MutableCFOptions& mutable_cf_options) {
|
|
// Only implemented for level-based compaction
|
|
if (compaction_style_ != kCompactionStyleLevel) {
|
|
estimated_compaction_needed_bytes_ = 0;
|
|
return;
|
|
}
|
|
|
|
// Start from Level 0, if level 0 qualifies compaction to level 1,
|
|
// we estimate the size of compaction.
|
|
// Then we move on to the next level and see whether it qualifies compaction
|
|
// to the next level. The size of the level is estimated as the actual size
|
|
// on the level plus the input bytes from the previous level if there is any.
|
|
// If it exceeds, take the exceeded bytes as compaction input and add the size
|
|
// of the compaction size to tatal size.
|
|
// We keep doing it to Level 2, 3, etc, until the last level and return the
|
|
// accumulated bytes.
|
|
|
|
uint64_t bytes_compact_to_next_level = 0;
|
|
uint64_t level_size = 0;
|
|
for (auto* f : files_[0]) {
|
|
level_size += f->fd.GetFileSize();
|
|
}
|
|
// Level 0
|
|
bool level0_compact_triggered = false;
|
|
if (static_cast<int>(files_[0].size()) >=
|
|
mutable_cf_options.level0_file_num_compaction_trigger ||
|
|
level_size >= mutable_cf_options.max_bytes_for_level_base) {
|
|
level0_compact_triggered = true;
|
|
estimated_compaction_needed_bytes_ = level_size;
|
|
bytes_compact_to_next_level = level_size;
|
|
} else {
|
|
estimated_compaction_needed_bytes_ = 0;
|
|
}
|
|
|
|
// Level 1 and up.
|
|
uint64_t bytes_next_level = 0;
|
|
for (int level = base_level(); level <= MaxInputLevel(); level++) {
|
|
level_size = 0;
|
|
if (bytes_next_level > 0) {
|
|
#ifndef NDEBUG
|
|
uint64_t level_size2 = 0;
|
|
for (auto* f : files_[level]) {
|
|
level_size2 += f->fd.GetFileSize();
|
|
}
|
|
assert(level_size2 == bytes_next_level);
|
|
#endif
|
|
level_size = bytes_next_level;
|
|
bytes_next_level = 0;
|
|
} else {
|
|
for (auto* f : files_[level]) {
|
|
level_size += f->fd.GetFileSize();
|
|
}
|
|
}
|
|
if (level == base_level() && level0_compact_triggered) {
|
|
// Add base level size to compaction if level0 compaction triggered.
|
|
estimated_compaction_needed_bytes_ += level_size;
|
|
}
|
|
// Add size added by previous compaction
|
|
level_size += bytes_compact_to_next_level;
|
|
bytes_compact_to_next_level = 0;
|
|
uint64_t level_target = MaxBytesForLevel(level);
|
|
if (level_size > level_target) {
|
|
bytes_compact_to_next_level = level_size - level_target;
|
|
// Estimate the actual compaction fan-out ratio as size ratio between
|
|
// the two levels.
|
|
|
|
assert(bytes_next_level == 0);
|
|
if (level + 1 < num_levels_) {
|
|
for (auto* f : files_[level + 1]) {
|
|
bytes_next_level += f->fd.GetFileSize();
|
|
}
|
|
}
|
|
if (bytes_next_level > 0) {
|
|
assert(level_size > 0);
|
|
estimated_compaction_needed_bytes_ += static_cast<uint64_t>(
|
|
static_cast<double>(bytes_compact_to_next_level) *
|
|
(static_cast<double>(bytes_next_level) /
|
|
static_cast<double>(level_size) +
|
|
1));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
uint32_t GetExpiredTtlFilesCount(const ImmutableCFOptions& ioptions,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
const std::vector<FileMetaData*>& files) {
|
|
uint32_t ttl_expired_files_count = 0;
|
|
|
|
int64_t _current_time;
|
|
auto status = ioptions.env->GetCurrentTime(&_current_time);
|
|
if (status.ok()) {
|
|
const uint64_t current_time = static_cast<uint64_t>(_current_time);
|
|
for (auto f : files) {
|
|
if (!f->being_compacted && f->fd.table_reader != nullptr &&
|
|
f->fd.table_reader->GetTableProperties() != nullptr) {
|
|
auto creation_time =
|
|
f->fd.table_reader->GetTableProperties()->creation_time;
|
|
if (creation_time > 0 &&
|
|
creation_time < (current_time -
|
|
mutable_cf_options.compaction_options_fifo.ttl)) {
|
|
ttl_expired_files_count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ttl_expired_files_count;
|
|
}
|
|
} // anonymous namespace
|
|
|
|
void VersionStorageInfo::ComputeCompactionScore(
|
|
const ImmutableCFOptions& immutable_cf_options,
|
|
const MutableCFOptions& mutable_cf_options) {
|
|
for (int level = 0; level <= MaxInputLevel(); level++) {
|
|
double score;
|
|
if (level == 0) {
|
|
// We treat level-0 specially by bounding the number of files
|
|
// instead of number of bytes for two reasons:
|
|
//
|
|
// (1) With larger write-buffer sizes, it is nice not to do too
|
|
// many level-0 compactions.
|
|
//
|
|
// (2) The files in level-0 are merged on every read and
|
|
// therefore we wish to avoid too many files when the individual
|
|
// file size is small (perhaps because of a small write-buffer
|
|
// setting, or very high compression ratios, or lots of
|
|
// overwrites/deletions).
|
|
int num_sorted_runs = 0;
|
|
uint64_t total_size = 0;
|
|
for (auto* f : files_[level]) {
|
|
if (!f->being_compacted) {
|
|
total_size += f->compensated_file_size;
|
|
num_sorted_runs++;
|
|
}
|
|
}
|
|
if (compaction_style_ == kCompactionStyleUniversal) {
|
|
// For universal compaction, we use level0 score to indicate
|
|
// compaction score for the whole DB. Adding other levels as if
|
|
// they are L0 files.
|
|
for (int i = 1; i < num_levels(); i++) {
|
|
if (!files_[i].empty() && !files_[i][0]->being_compacted) {
|
|
num_sorted_runs++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (compaction_style_ == kCompactionStyleFIFO) {
|
|
score = static_cast<double>(total_size) /
|
|
mutable_cf_options.compaction_options_fifo.max_table_files_size;
|
|
if (mutable_cf_options.compaction_options_fifo.allow_compaction) {
|
|
score = std::max(
|
|
static_cast<double>(num_sorted_runs) /
|
|
mutable_cf_options.level0_file_num_compaction_trigger,
|
|
score);
|
|
}
|
|
if (mutable_cf_options.compaction_options_fifo.ttl > 0) {
|
|
score = std::max(
|
|
static_cast<double>(GetExpiredTtlFilesCount(
|
|
immutable_cf_options, mutable_cf_options, files_[level])),
|
|
score);
|
|
}
|
|
|
|
} else {
|
|
score = static_cast<double>(num_sorted_runs) /
|
|
mutable_cf_options.level0_file_num_compaction_trigger;
|
|
if (compaction_style_ == kCompactionStyleLevel && num_levels() > 1) {
|
|
// Level-based involves L0->L0 compactions that can lead to oversized
|
|
// L0 files. Take into account size as well to avoid later giant
|
|
// compactions to the base level.
|
|
score = std::max(
|
|
score, static_cast<double>(total_size) /
|
|
mutable_cf_options.max_bytes_for_level_base);
|
|
}
|
|
}
|
|
} else {
|
|
// Compute the ratio of current size to size limit.
|
|
uint64_t level_bytes_no_compacting = 0;
|
|
for (auto f : files_[level]) {
|
|
if (!f->being_compacted) {
|
|
level_bytes_no_compacting += f->compensated_file_size;
|
|
}
|
|
}
|
|
score = static_cast<double>(level_bytes_no_compacting) /
|
|
MaxBytesForLevel(level);
|
|
}
|
|
compaction_level_[level] = level;
|
|
compaction_score_[level] = score;
|
|
}
|
|
|
|
// sort all the levels based on their score. Higher scores get listed
|
|
// first. Use bubble sort because the number of entries are small.
|
|
for (int i = 0; i < num_levels() - 2; i++) {
|
|
for (int j = i + 1; j < num_levels() - 1; j++) {
|
|
if (compaction_score_[i] < compaction_score_[j]) {
|
|
double score = compaction_score_[i];
|
|
int level = compaction_level_[i];
|
|
compaction_score_[i] = compaction_score_[j];
|
|
compaction_level_[i] = compaction_level_[j];
|
|
compaction_score_[j] = score;
|
|
compaction_level_[j] = level;
|
|
}
|
|
}
|
|
}
|
|
ComputeFilesMarkedForCompaction();
|
|
ComputeBottommostFilesMarkedForCompaction();
|
|
if (mutable_cf_options.ttl > 0) {
|
|
ComputeExpiredTtlFiles(immutable_cf_options, mutable_cf_options.ttl);
|
|
}
|
|
EstimateCompactionBytesNeeded(mutable_cf_options);
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeFilesMarkedForCompaction() {
|
|
files_marked_for_compaction_.clear();
|
|
int last_qualify_level = 0;
|
|
|
|
// Do not include files from the last level with data
|
|
// If table properties collector suggests a file on the last level,
|
|
// we should not move it to a new level.
|
|
for (int level = num_levels() - 1; level >= 1; level--) {
|
|
if (!files_[level].empty()) {
|
|
last_qualify_level = level - 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (int level = 0; level <= last_qualify_level; level++) {
|
|
for (auto* f : files_[level]) {
|
|
if (!f->being_compacted && f->marked_for_compaction) {
|
|
files_marked_for_compaction_.emplace_back(level, f);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeExpiredTtlFiles(
|
|
const ImmutableCFOptions& ioptions, const uint64_t ttl) {
|
|
assert(ttl > 0);
|
|
|
|
expired_ttl_files_.clear();
|
|
|
|
int64_t _current_time;
|
|
auto status = ioptions.env->GetCurrentTime(&_current_time);
|
|
if (!status.ok()) {
|
|
return;
|
|
}
|
|
const uint64_t current_time = static_cast<uint64_t>(_current_time);
|
|
|
|
for (int level = 0; level < num_levels() - 1; level++) {
|
|
for (auto f : files_[level]) {
|
|
if (!f->being_compacted && f->fd.table_reader != nullptr &&
|
|
f->fd.table_reader->GetTableProperties() != nullptr) {
|
|
auto creation_time =
|
|
f->fd.table_reader->GetTableProperties()->creation_time;
|
|
if (creation_time > 0 && creation_time < (current_time - ttl)) {
|
|
expired_ttl_files_.emplace_back(level, f);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
|
|
// used to sort files by size
|
|
struct Fsize {
|
|
size_t index;
|
|
FileMetaData* file;
|
|
};
|
|
|
|
// Compator that is used to sort files based on their size
|
|
// In normal mode: descending size
|
|
bool CompareCompensatedSizeDescending(const Fsize& first, const Fsize& second) {
|
|
return (first.file->compensated_file_size >
|
|
second.file->compensated_file_size);
|
|
}
|
|
} // anonymous namespace
|
|
|
|
void VersionStorageInfo::AddFile(int level, FileMetaData* f, Logger* info_log) {
|
|
auto* level_files = &files_[level];
|
|
// Must not overlap
|
|
#ifndef NDEBUG
|
|
if (level > 0 && !level_files->empty() &&
|
|
internal_comparator_->Compare(
|
|
(*level_files)[level_files->size() - 1]->largest, f->smallest) >= 0) {
|
|
auto* f2 = (*level_files)[level_files->size() - 1];
|
|
if (info_log != nullptr) {
|
|
Error(info_log, "Adding new file %" PRIu64
|
|
" range (%s, %s) to level %d but overlapping "
|
|
"with existing file %" PRIu64 " %s %s",
|
|
f->fd.GetNumber(), f->smallest.DebugString(true).c_str(),
|
|
f->largest.DebugString(true).c_str(), level, f2->fd.GetNumber(),
|
|
f2->smallest.DebugString(true).c_str(),
|
|
f2->largest.DebugString(true).c_str());
|
|
LogFlush(info_log);
|
|
}
|
|
assert(false);
|
|
}
|
|
#else
|
|
(void)info_log;
|
|
#endif
|
|
f->refs++;
|
|
level_files->push_back(f);
|
|
}
|
|
|
|
// Version::PrepareApply() need to be called before calling the function, or
|
|
// following functions called:
|
|
// 1. UpdateNumNonEmptyLevels();
|
|
// 2. CalculateBaseBytes();
|
|
// 3. UpdateFilesByCompactionPri();
|
|
// 4. GenerateFileIndexer();
|
|
// 5. GenerateLevelFilesBrief();
|
|
// 6. GenerateLevel0NonOverlapping();
|
|
// 7. GenerateBottommostFiles();
|
|
void VersionStorageInfo::SetFinalized() {
|
|
finalized_ = true;
|
|
#ifndef NDEBUG
|
|
if (compaction_style_ != kCompactionStyleLevel) {
|
|
// Not level based compaction.
|
|
return;
|
|
}
|
|
assert(base_level_ < 0 || num_levels() == 1 ||
|
|
(base_level_ >= 1 && base_level_ < num_levels()));
|
|
// Verify all levels newer than base_level are empty except L0
|
|
for (int level = 1; level < base_level(); level++) {
|
|
assert(NumLevelBytes(level) == 0);
|
|
}
|
|
uint64_t max_bytes_prev_level = 0;
|
|
for (int level = base_level(); level < num_levels() - 1; level++) {
|
|
if (LevelFiles(level).size() == 0) {
|
|
continue;
|
|
}
|
|
assert(MaxBytesForLevel(level) >= max_bytes_prev_level);
|
|
max_bytes_prev_level = MaxBytesForLevel(level);
|
|
}
|
|
int num_empty_non_l0_level = 0;
|
|
for (int level = 0; level < num_levels(); level++) {
|
|
assert(LevelFiles(level).size() == 0 ||
|
|
LevelFiles(level).size() == LevelFilesBrief(level).num_files);
|
|
if (level > 0 && NumLevelBytes(level) > 0) {
|
|
num_empty_non_l0_level++;
|
|
}
|
|
if (LevelFiles(level).size() > 0) {
|
|
assert(level < num_non_empty_levels());
|
|
}
|
|
}
|
|
assert(compaction_level_.size() > 0);
|
|
assert(compaction_level_.size() == compaction_score_.size());
|
|
#endif
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateNumNonEmptyLevels() {
|
|
num_non_empty_levels_ = num_levels_;
|
|
for (int i = num_levels_ - 1; i >= 0; i--) {
|
|
if (files_[i].size() != 0) {
|
|
return;
|
|
} else {
|
|
num_non_empty_levels_ = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
// Sort `temp` based on ratio of overlapping size over file size
|
|
void SortFileByOverlappingRatio(
|
|
const InternalKeyComparator& icmp, const std::vector<FileMetaData*>& files,
|
|
const std::vector<FileMetaData*>& next_level_files,
|
|
std::vector<Fsize>* temp) {
|
|
std::unordered_map<uint64_t, uint64_t> file_to_order;
|
|
auto next_level_it = next_level_files.begin();
|
|
|
|
for (auto& file : files) {
|
|
uint64_t overlapping_bytes = 0;
|
|
// Skip files in next level that is smaller than current file
|
|
while (next_level_it != next_level_files.end() &&
|
|
icmp.Compare((*next_level_it)->largest, file->smallest) < 0) {
|
|
next_level_it++;
|
|
}
|
|
|
|
while (next_level_it != next_level_files.end() &&
|
|
icmp.Compare((*next_level_it)->smallest, file->largest) < 0) {
|
|
overlapping_bytes += (*next_level_it)->fd.file_size;
|
|
|
|
if (icmp.Compare((*next_level_it)->largest, file->largest) > 0) {
|
|
// next level file cross large boundary of current file.
|
|
break;
|
|
}
|
|
next_level_it++;
|
|
}
|
|
|
|
assert(file->fd.file_size != 0);
|
|
file_to_order[file->fd.GetNumber()] =
|
|
overlapping_bytes * 1024u / file->fd.file_size;
|
|
}
|
|
|
|
std::sort(temp->begin(), temp->end(),
|
|
[&](const Fsize& f1, const Fsize& f2) -> bool {
|
|
return file_to_order[f1.file->fd.GetNumber()] <
|
|
file_to_order[f2.file->fd.GetNumber()];
|
|
});
|
|
}
|
|
} // namespace
|
|
|
|
void VersionStorageInfo::UpdateFilesByCompactionPri(
|
|
CompactionPri compaction_pri) {
|
|
if (compaction_style_ == kCompactionStyleNone ||
|
|
compaction_style_ == kCompactionStyleFIFO ||
|
|
compaction_style_ == kCompactionStyleUniversal) {
|
|
// don't need this
|
|
return;
|
|
}
|
|
// No need to sort the highest level because it is never compacted.
|
|
for (int level = 0; level < num_levels() - 1; level++) {
|
|
const std::vector<FileMetaData*>& files = files_[level];
|
|
auto& files_by_compaction_pri = files_by_compaction_pri_[level];
|
|
assert(files_by_compaction_pri.size() == 0);
|
|
|
|
// populate a temp vector for sorting based on size
|
|
std::vector<Fsize> temp(files.size());
|
|
for (size_t i = 0; i < files.size(); i++) {
|
|
temp[i].index = i;
|
|
temp[i].file = files[i];
|
|
}
|
|
|
|
// sort the top number_of_files_to_sort_ based on file size
|
|
size_t num = VersionStorageInfo::kNumberFilesToSort;
|
|
if (num > temp.size()) {
|
|
num = temp.size();
|
|
}
|
|
switch (compaction_pri) {
|
|
case kByCompensatedSize:
|
|
std::partial_sort(temp.begin(), temp.begin() + num, temp.end(),
|
|
CompareCompensatedSizeDescending);
|
|
break;
|
|
case kOldestLargestSeqFirst:
|
|
std::sort(temp.begin(), temp.end(),
|
|
[](const Fsize& f1, const Fsize& f2) -> bool {
|
|
return f1.file->fd.largest_seqno <
|
|
f2.file->fd.largest_seqno;
|
|
});
|
|
break;
|
|
case kOldestSmallestSeqFirst:
|
|
std::sort(temp.begin(), temp.end(),
|
|
[](const Fsize& f1, const Fsize& f2) -> bool {
|
|
return f1.file->fd.smallest_seqno <
|
|
f2.file->fd.smallest_seqno;
|
|
});
|
|
break;
|
|
case kMinOverlappingRatio:
|
|
SortFileByOverlappingRatio(*internal_comparator_, files_[level],
|
|
files_[level + 1], &temp);
|
|
break;
|
|
default:
|
|
assert(false);
|
|
}
|
|
assert(temp.size() == files.size());
|
|
|
|
// initialize files_by_compaction_pri_
|
|
for (size_t i = 0; i < temp.size(); i++) {
|
|
files_by_compaction_pri.push_back(static_cast<int>(temp[i].index));
|
|
}
|
|
next_file_to_compact_by_size_[level] = 0;
|
|
assert(files_[level].size() == files_by_compaction_pri_[level].size());
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::GenerateLevel0NonOverlapping() {
|
|
assert(!finalized_);
|
|
level0_non_overlapping_ = true;
|
|
if (level_files_brief_.size() == 0) {
|
|
return;
|
|
}
|
|
|
|
// A copy of L0 files sorted by smallest key
|
|
std::vector<FdWithKeyRange> level0_sorted_file(
|
|
level_files_brief_[0].files,
|
|
level_files_brief_[0].files + level_files_brief_[0].num_files);
|
|
std::sort(level0_sorted_file.begin(), level0_sorted_file.end(),
|
|
[this](const FdWithKeyRange& f1, const FdWithKeyRange& f2) -> bool {
|
|
return (internal_comparator_->Compare(f1.smallest_key,
|
|
f2.smallest_key) < 0);
|
|
});
|
|
|
|
for (size_t i = 1; i < level0_sorted_file.size(); ++i) {
|
|
FdWithKeyRange& f = level0_sorted_file[i];
|
|
FdWithKeyRange& prev = level0_sorted_file[i - 1];
|
|
if (internal_comparator_->Compare(prev.largest_key, f.smallest_key) >= 0) {
|
|
level0_non_overlapping_ = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::GenerateBottommostFiles() {
|
|
assert(!finalized_);
|
|
assert(bottommost_files_.empty());
|
|
for (size_t level = 0; level < level_files_brief_.size(); ++level) {
|
|
for (size_t file_idx = 0; file_idx < level_files_brief_[level].num_files;
|
|
++file_idx) {
|
|
const FdWithKeyRange& f = level_files_brief_[level].files[file_idx];
|
|
int l0_file_idx;
|
|
if (level == 0) {
|
|
l0_file_idx = static_cast<int>(file_idx);
|
|
} else {
|
|
l0_file_idx = -1;
|
|
}
|
|
Slice smallest_user_key = ExtractUserKey(f.smallest_key);
|
|
Slice largest_user_key = ExtractUserKey(f.largest_key);
|
|
if (!RangeMightExistAfterSortedRun(smallest_user_key, largest_user_key,
|
|
static_cast<int>(level),
|
|
l0_file_idx)) {
|
|
bottommost_files_.emplace_back(static_cast<int>(level),
|
|
f.file_metadata);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateOldestSnapshot(SequenceNumber seqnum) {
|
|
assert(seqnum >= oldest_snapshot_seqnum_);
|
|
oldest_snapshot_seqnum_ = seqnum;
|
|
if (oldest_snapshot_seqnum_ > bottommost_files_mark_threshold_) {
|
|
ComputeBottommostFilesMarkedForCompaction();
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeBottommostFilesMarkedForCompaction() {
|
|
bottommost_files_marked_for_compaction_.clear();
|
|
bottommost_files_mark_threshold_ = kMaxSequenceNumber;
|
|
for (auto& level_and_file : bottommost_files_) {
|
|
if (!level_and_file.second->being_compacted &&
|
|
level_and_file.second->fd.largest_seqno != 0 &&
|
|
level_and_file.second->num_deletions > 1) {
|
|
// largest_seqno might be nonzero due to containing the final key in an
|
|
// earlier compaction, whose seqnum we didn't zero out. Multiple deletions
|
|
// ensures the file really contains deleted or overwritten keys.
|
|
if (level_and_file.second->fd.largest_seqno < oldest_snapshot_seqnum_) {
|
|
bottommost_files_marked_for_compaction_.push_back(level_and_file);
|
|
} else {
|
|
bottommost_files_mark_threshold_ =
|
|
std::min(bottommost_files_mark_threshold_,
|
|
level_and_file.second->fd.largest_seqno);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Version::Ref() {
|
|
++refs_;
|
|
}
|
|
|
|
bool Version::Unref() {
|
|
assert(refs_ >= 1);
|
|
--refs_;
|
|
if (refs_ == 0) {
|
|
delete this;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool VersionStorageInfo::OverlapInLevel(int level,
|
|
const Slice* smallest_user_key,
|
|
const Slice* largest_user_key) {
|
|
if (level >= num_non_empty_levels_) {
|
|
// empty level, no overlap
|
|
return false;
|
|
}
|
|
return SomeFileOverlapsRange(*internal_comparator_, (level > 0),
|
|
level_files_brief_[level], smallest_user_key,
|
|
largest_user_key);
|
|
}
|
|
|
|
// Store in "*inputs" all files in "level" that overlap [begin,end]
|
|
// If hint_index is specified, then it points to a file in the
|
|
// overlapping range.
|
|
// The file_index returns a pointer to any file in an overlapping range.
|
|
void VersionStorageInfo::GetOverlappingInputs(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
std::vector<FileMetaData*>* inputs, int hint_index, int* file_index,
|
|
bool expand_range, InternalKey** next_smallest) const {
|
|
if (level >= num_non_empty_levels_) {
|
|
// this level is empty, no overlapping inputs
|
|
return;
|
|
}
|
|
|
|
inputs->clear();
|
|
if (file_index) {
|
|
*file_index = -1;
|
|
}
|
|
const Comparator* user_cmp = user_comparator_;
|
|
if (level > 0) {
|
|
GetOverlappingInputsRangeBinarySearch(level, begin, end, inputs, hint_index,
|
|
file_index, false, next_smallest);
|
|
return;
|
|
}
|
|
|
|
if (next_smallest) {
|
|
// next_smallest key only makes sense for non-level 0, where files are
|
|
// non-overlapping
|
|
*next_smallest = nullptr;
|
|
}
|
|
|
|
Slice user_begin, user_end;
|
|
if (begin != nullptr) {
|
|
user_begin = begin->user_key();
|
|
}
|
|
if (end != nullptr) {
|
|
user_end = end->user_key();
|
|
}
|
|
|
|
// index stores the file index need to check.
|
|
std::list<size_t> index;
|
|
for (size_t i = 0; i < level_files_brief_[level].num_files; i++) {
|
|
index.emplace_back(i);
|
|
}
|
|
|
|
while (!index.empty()) {
|
|
bool found_overlapping_file = false;
|
|
auto iter = index.begin();
|
|
while (iter != index.end()) {
|
|
FdWithKeyRange* f = &(level_files_brief_[level].files[*iter]);
|
|
const Slice file_start = ExtractUserKey(f->smallest_key);
|
|
const Slice file_limit = ExtractUserKey(f->largest_key);
|
|
if (begin != nullptr && user_cmp->Compare(file_limit, user_begin) < 0) {
|
|
// "f" is completely before specified range; skip it
|
|
iter++;
|
|
} else if (end != nullptr &&
|
|
user_cmp->Compare(file_start, user_end) > 0) {
|
|
// "f" is completely after specified range; skip it
|
|
iter++;
|
|
} else {
|
|
// if overlap
|
|
inputs->emplace_back(files_[level][*iter]);
|
|
found_overlapping_file = true;
|
|
// record the first file index.
|
|
if (file_index && *file_index == -1) {
|
|
*file_index = static_cast<int>(*iter);
|
|
}
|
|
// the related file is overlap, erase to avoid checking again.
|
|
iter = index.erase(iter);
|
|
if (expand_range) {
|
|
if (begin != nullptr &&
|
|
user_cmp->Compare(file_start, user_begin) < 0) {
|
|
user_begin = file_start;
|
|
}
|
|
if (end != nullptr && user_cmp->Compare(file_limit, user_end) > 0) {
|
|
user_end = file_limit;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// if all the files left are not overlap, break
|
|
if (!found_overlapping_file) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Store in "*inputs" files in "level" that within range [begin,end]
|
|
// Guarantee a "clean cut" boundary between the files in inputs
|
|
// and the surrounding files and the maxinum number of files.
|
|
// This will ensure that no parts of a key are lost during compaction.
|
|
// If hint_index is specified, then it points to a file in the range.
|
|
// The file_index returns a pointer to any file in an overlapping range.
|
|
void VersionStorageInfo::GetCleanInputsWithinInterval(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
std::vector<FileMetaData*>* inputs, int hint_index, int* file_index) const {
|
|
inputs->clear();
|
|
if (file_index) {
|
|
*file_index = -1;
|
|
}
|
|
if (level >= num_non_empty_levels_ || level == 0 ||
|
|
level_files_brief_[level].num_files == 0) {
|
|
// this level is empty, no inputs within range
|
|
// also don't support clean input interval within L0
|
|
return;
|
|
}
|
|
|
|
const auto& level_files = level_files_brief_[level];
|
|
if (begin == nullptr) {
|
|
begin = &level_files.files[0].file_metadata->smallest;
|
|
}
|
|
if (end == nullptr) {
|
|
end = &level_files.files[level_files.num_files - 1].file_metadata->largest;
|
|
}
|
|
|
|
GetOverlappingInputsRangeBinarySearch(level, begin, end, inputs,
|
|
hint_index, file_index,
|
|
true /* within_interval */);
|
|
}
|
|
|
|
// Store in "*inputs" all files in "level" that overlap [begin,end]
|
|
// Employ binary search to find at least one file that overlaps the
|
|
// specified range. From that file, iterate backwards and
|
|
// forwards to find all overlapping files.
|
|
// if within_range is set, then only store the maximum clean inputs
|
|
// within range [begin, end]. "clean" means there is a boudnary
|
|
// between the files in "*inputs" and the surrounding files
|
|
void VersionStorageInfo::GetOverlappingInputsRangeBinarySearch(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
std::vector<FileMetaData*>* inputs, int hint_index, int* file_index,
|
|
bool within_interval, InternalKey** next_smallest) const {
|
|
assert(level > 0);
|
|
int min = 0;
|
|
int mid = 0;
|
|
int max = static_cast<int>(files_[level].size()) - 1;
|
|
bool foundOverlap = false;
|
|
auto user_cmp = user_comparator_;
|
|
|
|
// if the caller already knows the index of a file that has overlap,
|
|
// then we can skip the binary search.
|
|
if (hint_index != -1) {
|
|
mid = hint_index;
|
|
foundOverlap = true;
|
|
}
|
|
|
|
while (!foundOverlap && min <= max) {
|
|
mid = (min + max)/2;
|
|
FdWithKeyRange* f = &(level_files_brief_[level].files[mid]);
|
|
auto& smallest = f->file_metadata->smallest;
|
|
auto& largest = f->file_metadata->largest;
|
|
if ((!within_interval && sstableKeyCompare(user_cmp, begin, largest) > 0) ||
|
|
(within_interval && sstableKeyCompare(user_cmp, begin, smallest) > 0)) {
|
|
min = mid + 1;
|
|
} else if ((!within_interval &&
|
|
sstableKeyCompare(user_cmp, smallest, end) > 0) ||
|
|
(within_interval &&
|
|
sstableKeyCompare(user_cmp, largest, end) > 0)) {
|
|
max = mid - 1;
|
|
} else {
|
|
foundOverlap = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If there were no overlapping files, return immediately.
|
|
if (!foundOverlap) {
|
|
if (next_smallest) {
|
|
next_smallest = nullptr;
|
|
}
|
|
return;
|
|
}
|
|
// returns the index where an overlap is found
|
|
if (file_index) {
|
|
*file_index = mid;
|
|
}
|
|
|
|
int start_index, end_index;
|
|
if (within_interval) {
|
|
ExtendFileRangeWithinInterval(level, begin, end, mid,
|
|
&start_index, &end_index);
|
|
} else {
|
|
ExtendFileRangeOverlappingInterval(level, begin, end, mid,
|
|
&start_index, &end_index);
|
|
assert(end_index >= start_index);
|
|
}
|
|
// insert overlapping files into vector
|
|
for (int i = start_index; i <= end_index; i++) {
|
|
inputs->push_back(files_[level][i]);
|
|
}
|
|
|
|
if (next_smallest != nullptr) {
|
|
// Provide the next key outside the range covered by inputs
|
|
if (++end_index < static_cast<int>(files_[level].size())) {
|
|
**next_smallest = files_[level][end_index]->smallest;
|
|
} else {
|
|
*next_smallest = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Store in *start_index and *end_index the range of all files in
|
|
// "level" that overlap [begin,end]
|
|
// The mid_index specifies the index of at least one file that
|
|
// overlaps the specified range. From that file, iterate backward
|
|
// and forward to find all overlapping files.
|
|
// Use FileLevel in searching, make it faster
|
|
void VersionStorageInfo::ExtendFileRangeOverlappingInterval(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
unsigned int mid_index, int* start_index, int* end_index) const {
|
|
auto user_cmp = user_comparator_;
|
|
const FdWithKeyRange* files = level_files_brief_[level].files;
|
|
#ifndef NDEBUG
|
|
{
|
|
// assert that the file at mid_index overlaps with the range
|
|
assert(mid_index < level_files_brief_[level].num_files);
|
|
const FdWithKeyRange* f = &files[mid_index];
|
|
auto& smallest = f->file_metadata->smallest;
|
|
auto& largest = f->file_metadata->largest;
|
|
if (sstableKeyCompare(user_cmp, begin, smallest) <= 0) {
|
|
assert(sstableKeyCompare(user_cmp, smallest, end) <= 0);
|
|
} else {
|
|
// fprintf(stderr, "ExtendFileRangeOverlappingInterval\n%s - %s\n%s - %s\n%d %d\n",
|
|
// begin ? begin->DebugString().c_str() : "(null)",
|
|
// end ? end->DebugString().c_str() : "(null)",
|
|
// smallest->DebugString().c_str(),
|
|
// largest->DebugString().c_str(),
|
|
// sstableKeyCompare(user_cmp, smallest, begin),
|
|
// sstableKeyCompare(user_cmp, largest, begin));
|
|
assert(sstableKeyCompare(user_cmp, begin, largest) <= 0);
|
|
}
|
|
}
|
|
#endif
|
|
*start_index = mid_index + 1;
|
|
*end_index = mid_index;
|
|
int count __attribute__((__unused__));
|
|
count = 0;
|
|
|
|
// check backwards from 'mid' to lower indices
|
|
for (int i = mid_index; i >= 0 ; i--) {
|
|
const FdWithKeyRange* f = &files[i];
|
|
auto& largest = f->file_metadata->largest;
|
|
if (sstableKeyCompare(user_cmp, begin, largest) <= 0) {
|
|
*start_index = i;
|
|
assert((count++, true));
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
// check forward from 'mid+1' to higher indices
|
|
for (unsigned int i = mid_index+1;
|
|
i < level_files_brief_[level].num_files; i++) {
|
|
const FdWithKeyRange* f = &files[i];
|
|
auto& smallest = f->file_metadata->smallest;
|
|
if (sstableKeyCompare(user_cmp, smallest, end) <= 0) {
|
|
assert((count++, true));
|
|
*end_index = i;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
assert(count == *end_index - *start_index + 1);
|
|
}
|
|
|
|
// Store in *start_index and *end_index the clean range of all files in
|
|
// "level" within [begin,end]
|
|
// The mid_index specifies the index of at least one file within
|
|
// the specified range. From that file, iterate backward
|
|
// and forward to find all overlapping files and then "shrink" to
|
|
// the clean range required.
|
|
// Use FileLevel in searching, make it faster
|
|
void VersionStorageInfo::ExtendFileRangeWithinInterval(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
unsigned int mid_index, int* start_index, int* end_index) const {
|
|
assert(level != 0);
|
|
auto* user_cmp = user_comparator_;
|
|
const FdWithKeyRange* files = level_files_brief_[level].files;
|
|
#ifndef NDEBUG
|
|
{
|
|
// assert that the file at mid_index is within the range
|
|
assert(mid_index < level_files_brief_[level].num_files);
|
|
const FdWithKeyRange* f = &files[mid_index];
|
|
auto& smallest = f->file_metadata->smallest;
|
|
auto& largest = f->file_metadata->largest;
|
|
assert(sstableKeyCompare(user_cmp, begin, smallest) <= 0 &&
|
|
sstableKeyCompare(user_cmp, largest, end) <= 0);
|
|
}
|
|
#endif
|
|
ExtendFileRangeOverlappingInterval(level, begin, end, mid_index,
|
|
start_index, end_index);
|
|
int left = *start_index;
|
|
int right = *end_index;
|
|
// shrink from left to right
|
|
while (left <= right) {
|
|
auto& smallest = files[left].file_metadata->smallest;
|
|
if (sstableKeyCompare(user_cmp, begin, smallest) > 0) {
|
|
left++;
|
|
continue;
|
|
}
|
|
if (left > 0) { // If not first file
|
|
auto& largest = files[left - 1].file_metadata->largest;
|
|
if (sstableKeyCompare(user_cmp, smallest, largest) == 0) {
|
|
left++;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
// shrink from right to left
|
|
while (left <= right) {
|
|
auto& largest = files[right].file_metadata->largest;
|
|
if (sstableKeyCompare(user_cmp, largest, end) > 0) {
|
|
right--;
|
|
continue;
|
|
}
|
|
if (right < static_cast<int>(level_files_brief_[level].num_files) -
|
|
1) { // If not the last file
|
|
auto& smallest = files[right + 1].file_metadata->smallest;
|
|
if (sstableKeyCompare(user_cmp, smallest, largest) == 0) {
|
|
// The last user key in range overlaps with the next file's first key
|
|
right--;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
*start_index = left;
|
|
*end_index = right;
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::NumLevelBytes(int level) const {
|
|
assert(level >= 0);
|
|
assert(level < num_levels());
|
|
return TotalFileSize(files_[level]);
|
|
}
|
|
|
|
const char* VersionStorageInfo::LevelSummary(
|
|
LevelSummaryStorage* scratch) const {
|
|
int len = 0;
|
|
if (compaction_style_ == kCompactionStyleLevel && num_levels() > 1) {
|
|
assert(base_level_ < static_cast<int>(level_max_bytes_.size()));
|
|
if (level_multiplier_ != 0.0) {
|
|
len = snprintf(
|
|
scratch->buffer, sizeof(scratch->buffer),
|
|
"base level %d level multiplier %.2f max bytes base %" PRIu64 " ",
|
|
base_level_, level_multiplier_, level_max_bytes_[base_level_]);
|
|
}
|
|
}
|
|
len +=
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, "files[");
|
|
for (int i = 0; i < num_levels(); i++) {
|
|
int sz = sizeof(scratch->buffer) - len;
|
|
int ret = snprintf(scratch->buffer + len, sz, "%d ", int(files_[i].size()));
|
|
if (ret < 0 || ret >= sz) break;
|
|
len += ret;
|
|
}
|
|
if (len > 0) {
|
|
// overwrite the last space
|
|
--len;
|
|
}
|
|
len += snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
|
|
"] max score %.2f", compaction_score_[0]);
|
|
|
|
if (!files_marked_for_compaction_.empty()) {
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
|
|
" (%" ROCKSDB_PRIszt " files need compaction)",
|
|
files_marked_for_compaction_.size());
|
|
}
|
|
|
|
return scratch->buffer;
|
|
}
|
|
|
|
const char* VersionStorageInfo::LevelFileSummary(FileSummaryStorage* scratch,
|
|
int level) const {
|
|
int len = snprintf(scratch->buffer, sizeof(scratch->buffer), "files_size[");
|
|
for (const auto& f : files_[level]) {
|
|
int sz = sizeof(scratch->buffer) - len;
|
|
char sztxt[16];
|
|
AppendHumanBytes(f->fd.GetFileSize(), sztxt, sizeof(sztxt));
|
|
int ret = snprintf(scratch->buffer + len, sz,
|
|
"#%" PRIu64 "(seq=%" PRIu64 ",sz=%s,%d) ",
|
|
f->fd.GetNumber(), f->fd.smallest_seqno, sztxt,
|
|
static_cast<int>(f->being_compacted));
|
|
if (ret < 0 || ret >= sz)
|
|
break;
|
|
len += ret;
|
|
}
|
|
// overwrite the last space (only if files_[level].size() is non-zero)
|
|
if (files_[level].size() && len > 0) {
|
|
--len;
|
|
}
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, "]");
|
|
return scratch->buffer;
|
|
}
|
|
|
|
int64_t VersionStorageInfo::MaxNextLevelOverlappingBytes() {
|
|
uint64_t result = 0;
|
|
std::vector<FileMetaData*> overlaps;
|
|
for (int level = 1; level < num_levels() - 1; level++) {
|
|
for (const auto& f : files_[level]) {
|
|
GetOverlappingInputs(level + 1, &f->smallest, &f->largest, &overlaps);
|
|
const uint64_t sum = TotalFileSize(overlaps);
|
|
if (sum > result) {
|
|
result = sum;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::MaxBytesForLevel(int level) const {
|
|
// Note: the result for level zero is not really used since we set
|
|
// the level-0 compaction threshold based on number of files.
|
|
assert(level >= 0);
|
|
assert(level < static_cast<int>(level_max_bytes_.size()));
|
|
return level_max_bytes_[level];
|
|
}
|
|
|
|
void VersionStorageInfo::CalculateBaseBytes(const ImmutableCFOptions& ioptions,
|
|
const MutableCFOptions& options) {
|
|
// Special logic to set number of sorted runs.
|
|
// It is to match the previous behavior when all files are in L0.
|
|
int num_l0_count = static_cast<int>(files_[0].size());
|
|
if (compaction_style_ == kCompactionStyleUniversal) {
|
|
// For universal compaction, we use level0 score to indicate
|
|
// compaction score for the whole DB. Adding other levels as if
|
|
// they are L0 files.
|
|
for (int i = 1; i < num_levels(); i++) {
|
|
if (!files_[i].empty()) {
|
|
num_l0_count++;
|
|
}
|
|
}
|
|
}
|
|
set_l0_delay_trigger_count(num_l0_count);
|
|
|
|
level_max_bytes_.resize(ioptions.num_levels);
|
|
if (!ioptions.level_compaction_dynamic_level_bytes) {
|
|
base_level_ = (ioptions.compaction_style == kCompactionStyleLevel) ? 1 : -1;
|
|
|
|
// Calculate for static bytes base case
|
|
for (int i = 0; i < ioptions.num_levels; ++i) {
|
|
if (i == 0 && ioptions.compaction_style == kCompactionStyleUniversal) {
|
|
level_max_bytes_[i] = options.max_bytes_for_level_base;
|
|
} else if (i > 1) {
|
|
level_max_bytes_[i] = MultiplyCheckOverflow(
|
|
MultiplyCheckOverflow(level_max_bytes_[i - 1],
|
|
options.max_bytes_for_level_multiplier),
|
|
options.MaxBytesMultiplerAdditional(i - 1));
|
|
} else {
|
|
level_max_bytes_[i] = options.max_bytes_for_level_base;
|
|
}
|
|
}
|
|
} else {
|
|
uint64_t max_level_size = 0;
|
|
|
|
int first_non_empty_level = -1;
|
|
// Find size of non-L0 level of most data.
|
|
// Cannot use the size of the last level because it can be empty or less
|
|
// than previous levels after compaction.
|
|
for (int i = 1; i < num_levels_; i++) {
|
|
uint64_t total_size = 0;
|
|
for (const auto& f : files_[i]) {
|
|
total_size += f->fd.GetFileSize();
|
|
}
|
|
if (total_size > 0 && first_non_empty_level == -1) {
|
|
first_non_empty_level = i;
|
|
}
|
|
if (total_size > max_level_size) {
|
|
max_level_size = total_size;
|
|
}
|
|
}
|
|
|
|
// Prefill every level's max bytes to disallow compaction from there.
|
|
for (int i = 0; i < num_levels_; i++) {
|
|
level_max_bytes_[i] = std::numeric_limits<uint64_t>::max();
|
|
}
|
|
|
|
if (max_level_size == 0) {
|
|
// No data for L1 and up. L0 compacts to last level directly.
|
|
// No compaction from L1+ needs to be scheduled.
|
|
base_level_ = num_levels_ - 1;
|
|
} else {
|
|
uint64_t l0_size = 0;
|
|
for (const auto& f : files_[0]) {
|
|
l0_size += f->fd.GetFileSize();
|
|
}
|
|
|
|
uint64_t base_bytes_max =
|
|
std::max(options.max_bytes_for_level_base, l0_size);
|
|
uint64_t base_bytes_min = static_cast<uint64_t>(
|
|
base_bytes_max / options.max_bytes_for_level_multiplier);
|
|
|
|
// Try whether we can make last level's target size to be max_level_size
|
|
uint64_t cur_level_size = max_level_size;
|
|
for (int i = num_levels_ - 2; i >= first_non_empty_level; i--) {
|
|
// Round up after dividing
|
|
cur_level_size = static_cast<uint64_t>(
|
|
cur_level_size / options.max_bytes_for_level_multiplier);
|
|
}
|
|
|
|
// Calculate base level and its size.
|
|
uint64_t base_level_size;
|
|
if (cur_level_size <= base_bytes_min) {
|
|
// Case 1. If we make target size of last level to be max_level_size,
|
|
// target size of the first non-empty level would be smaller than
|
|
// base_bytes_min. We set it be base_bytes_min.
|
|
base_level_size = base_bytes_min + 1U;
|
|
base_level_ = first_non_empty_level;
|
|
ROCKS_LOG_WARN(ioptions.info_log,
|
|
"More existing levels in DB than needed. "
|
|
"max_bytes_for_level_multiplier may not be guaranteed.");
|
|
} else {
|
|
// Find base level (where L0 data is compacted to).
|
|
base_level_ = first_non_empty_level;
|
|
while (base_level_ > 1 && cur_level_size > base_bytes_max) {
|
|
--base_level_;
|
|
cur_level_size = static_cast<uint64_t>(
|
|
cur_level_size / options.max_bytes_for_level_multiplier);
|
|
}
|
|
if (cur_level_size > base_bytes_max) {
|
|
// Even L1 will be too large
|
|
assert(base_level_ == 1);
|
|
base_level_size = base_bytes_max;
|
|
} else {
|
|
base_level_size = cur_level_size;
|
|
}
|
|
}
|
|
|
|
level_multiplier_ = options.max_bytes_for_level_multiplier;
|
|
assert(base_level_size > 0);
|
|
if (l0_size > base_level_size &&
|
|
(l0_size > options.max_bytes_for_level_base ||
|
|
static_cast<int>(files_[0].size() / 2) >=
|
|
options.level0_file_num_compaction_trigger)) {
|
|
// We adjust the base level according to actual L0 size, and adjust
|
|
// the level multiplier accordingly, when:
|
|
// 1. the L0 size is larger than level size base, or
|
|
// 2. number of L0 files reaches twice the L0->L1 compaction trigger
|
|
// We don't do this otherwise to keep the LSM-tree structure stable
|
|
// unless the L0 compation is backlogged.
|
|
base_level_size = l0_size;
|
|
if (base_level_ == num_levels_ - 1) {
|
|
level_multiplier_ = 1.0;
|
|
} else {
|
|
level_multiplier_ = std::pow(
|
|
static_cast<double>(max_level_size) /
|
|
static_cast<double>(base_level_size),
|
|
1.0 / static_cast<double>(num_levels_ - base_level_ - 1));
|
|
}
|
|
}
|
|
|
|
uint64_t level_size = base_level_size;
|
|
for (int i = base_level_; i < num_levels_; i++) {
|
|
if (i > base_level_) {
|
|
level_size = MultiplyCheckOverflow(level_size, level_multiplier_);
|
|
}
|
|
// Don't set any level below base_bytes_max. Otherwise, the LSM can
|
|
// assume an hourglass shape where L1+ sizes are smaller than L0. This
|
|
// causes compaction scoring, which depends on level sizes, to favor L1+
|
|
// at the expense of L0, which may fill up and stall.
|
|
level_max_bytes_[i] = std::max(level_size, base_bytes_max);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::EstimateLiveDataSize() const {
|
|
// Estimate the live data size by adding up the size of the last level for all
|
|
// key ranges. Note: Estimate depends on the ordering of files in level 0
|
|
// because files in level 0 can be overlapping.
|
|
uint64_t size = 0;
|
|
|
|
auto ikey_lt = [this](InternalKey* x, InternalKey* y) {
|
|
return internal_comparator_->Compare(*x, *y) < 0;
|
|
};
|
|
// (Ordered) map of largest keys in non-overlapping files
|
|
std::map<InternalKey*, FileMetaData*, decltype(ikey_lt)> ranges(ikey_lt);
|
|
|
|
for (int l = num_levels_ - 1; l >= 0; l--) {
|
|
bool found_end = false;
|
|
for (auto file : files_[l]) {
|
|
// Find the first file where the largest key is larger than the smallest
|
|
// key of the current file. If this file does not overlap with the
|
|
// current file, none of the files in the map does. If there is
|
|
// no potential overlap, we can safely insert the rest of this level
|
|
// (if the level is not 0) into the map without checking again because
|
|
// the elements in the level are sorted and non-overlapping.
|
|
auto lb = (found_end && l != 0) ?
|
|
ranges.end() : ranges.lower_bound(&file->smallest);
|
|
found_end = (lb == ranges.end());
|
|
if (found_end || internal_comparator_->Compare(
|
|
file->largest, (*lb).second->smallest) < 0) {
|
|
ranges.emplace_hint(lb, &file->largest, file);
|
|
size += file->fd.file_size;
|
|
}
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
|
|
bool VersionStorageInfo::RangeMightExistAfterSortedRun(
|
|
const Slice& smallest_user_key, const Slice& largest_user_key,
|
|
int last_level, int last_l0_idx) {
|
|
assert((last_l0_idx != -1) == (last_level == 0));
|
|
// TODO(ajkr): this preserves earlier behavior where we considered an L0 file
|
|
// bottommost only if it's the oldest L0 file and there are no files on older
|
|
// levels. It'd be better to consider it bottommost if there's no overlap in
|
|
// older levels/files.
|
|
if (last_level == 0 &&
|
|
last_l0_idx != static_cast<int>(LevelFiles(0).size() - 1)) {
|
|
return true;
|
|
}
|
|
|
|
// Checks whether there are files living beyond the `last_level`. If lower
|
|
// levels have files, it checks for overlap between [`smallest_key`,
|
|
// `largest_key`] and those files. Bottomlevel optimizations can be made if
|
|
// there are no files in lower levels or if there is no overlap with the files
|
|
// in the lower levels.
|
|
for (int level = last_level + 1; level < num_levels(); level++) {
|
|
// The range is not in the bottommost level if there are files in lower
|
|
// levels when the `last_level` is 0 or if there are files in lower levels
|
|
// which overlap with [`smallest_key`, `largest_key`].
|
|
if (files_[level].size() > 0 &&
|
|
(last_level == 0 ||
|
|
OverlapInLevel(level, &smallest_user_key, &largest_user_key))) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Version::AddLiveFiles(std::vector<FileDescriptor>* live) {
|
|
for (int level = 0; level < storage_info_.num_levels(); level++) {
|
|
const std::vector<FileMetaData*>& files = storage_info_.files_[level];
|
|
for (const auto& file : files) {
|
|
live->push_back(file->fd);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string Version::DebugString(bool hex, bool print_stats) const {
|
|
std::string r;
|
|
for (int level = 0; level < storage_info_.num_levels_; level++) {
|
|
// E.g.,
|
|
// --- level 1 ---
|
|
// 17:123['a' .. 'd']
|
|
// 20:43['e' .. 'g']
|
|
//
|
|
// if print_stats=true:
|
|
// 17:123['a' .. 'd'](4096)
|
|
r.append("--- level ");
|
|
AppendNumberTo(&r, level);
|
|
r.append(" --- version# ");
|
|
AppendNumberTo(&r, version_number_);
|
|
r.append(" ---\n");
|
|
const std::vector<FileMetaData*>& files = storage_info_.files_[level];
|
|
for (size_t i = 0; i < files.size(); i++) {
|
|
r.push_back(' ');
|
|
AppendNumberTo(&r, files[i]->fd.GetNumber());
|
|
r.push_back(':');
|
|
AppendNumberTo(&r, files[i]->fd.GetFileSize());
|
|
r.append("[");
|
|
r.append(files[i]->smallest.DebugString(hex));
|
|
r.append(" .. ");
|
|
r.append(files[i]->largest.DebugString(hex));
|
|
r.append("]");
|
|
if (print_stats) {
|
|
r.append("(");
|
|
r.append(ToString(
|
|
files[i]->stats.num_reads_sampled.load(std::memory_order_relaxed)));
|
|
r.append(")");
|
|
}
|
|
r.append("\n");
|
|
}
|
|
}
|
|
return r;
|
|
}
|
|
|
|
// this is used to batch writes to the manifest file
|
|
struct VersionSet::ManifestWriter {
|
|
Status status;
|
|
bool done;
|
|
InstrumentedCondVar cv;
|
|
ColumnFamilyData* cfd;
|
|
const MutableCFOptions mutable_cf_options;
|
|
const autovector<VersionEdit*>& edit_list;
|
|
|
|
explicit ManifestWriter(InstrumentedMutex* mu, ColumnFamilyData* _cfd,
|
|
const MutableCFOptions& cf_options,
|
|
const autovector<VersionEdit*>& e)
|
|
: done(false),
|
|
cv(mu),
|
|
cfd(_cfd),
|
|
mutable_cf_options(cf_options),
|
|
edit_list(e) {}
|
|
};
|
|
|
|
VersionSet::VersionSet(const std::string& dbname,
|
|
const ImmutableDBOptions* _db_options,
|
|
const EnvOptions& storage_options, Cache* table_cache,
|
|
WriteBufferManager* write_buffer_manager,
|
|
WriteController* write_controller)
|
|
: column_family_set_(
|
|
new ColumnFamilySet(dbname, _db_options, storage_options, table_cache,
|
|
write_buffer_manager, write_controller)),
|
|
env_(_db_options->env),
|
|
dbname_(dbname),
|
|
db_options_(_db_options),
|
|
next_file_number_(2),
|
|
manifest_file_number_(0), // Filled by Recover()
|
|
options_file_number_(0),
|
|
pending_manifest_file_number_(0),
|
|
last_sequence_(0),
|
|
last_allocated_sequence_(0),
|
|
last_published_sequence_(0),
|
|
prev_log_number_(0),
|
|
current_version_number_(0),
|
|
manifest_file_size_(0),
|
|
env_options_(storage_options) {}
|
|
|
|
void CloseTables(void* ptr, size_t) {
|
|
TableReader* table_reader = reinterpret_cast<TableReader*>(ptr);
|
|
table_reader->Close();
|
|
}
|
|
|
|
VersionSet::~VersionSet() {
|
|
// we need to delete column_family_set_ because its destructor depends on
|
|
// VersionSet
|
|
Cache* table_cache = column_family_set_->get_table_cache();
|
|
table_cache->ApplyToAllCacheEntries(&CloseTables, false /* thread_safe */);
|
|
column_family_set_.reset();
|
|
for (auto& file : obsolete_files_) {
|
|
if (file.metadata->table_reader_handle) {
|
|
table_cache->Release(file.metadata->table_reader_handle);
|
|
TableCache::Evict(table_cache, file.metadata->fd.GetNumber());
|
|
}
|
|
file.DeleteMetadata();
|
|
}
|
|
obsolete_files_.clear();
|
|
}
|
|
|
|
void VersionSet::AppendVersion(ColumnFamilyData* column_family_data,
|
|
Version* v) {
|
|
// compute new compaction score
|
|
v->storage_info()->ComputeCompactionScore(
|
|
*column_family_data->ioptions(),
|
|
*column_family_data->GetLatestMutableCFOptions());
|
|
|
|
// Mark v finalized
|
|
v->storage_info_.SetFinalized();
|
|
|
|
// Make "v" current
|
|
assert(v->refs_ == 0);
|
|
Version* current = column_family_data->current();
|
|
assert(v != current);
|
|
if (current != nullptr) {
|
|
assert(current->refs_ > 0);
|
|
current->Unref();
|
|
}
|
|
column_family_data->SetCurrent(v);
|
|
v->Ref();
|
|
|
|
// Append to linked list
|
|
v->prev_ = column_family_data->dummy_versions()->prev_;
|
|
v->next_ = column_family_data->dummy_versions();
|
|
v->prev_->next_ = v;
|
|
v->next_->prev_ = v;
|
|
}
|
|
|
|
Status VersionSet::ProcessManifestWrites(
|
|
std::deque<ManifestWriter>& writers, InstrumentedMutex* mu,
|
|
Directory* db_directory, bool new_descriptor_log,
|
|
const ColumnFamilyOptions* new_cf_options) {
|
|
assert(!writers.empty());
|
|
ManifestWriter& first_writer = writers.front();
|
|
ManifestWriter* last_writer = &first_writer;
|
|
|
|
assert(!manifest_writers_.empty());
|
|
assert(manifest_writers_.front() == &first_writer);
|
|
|
|
autovector<VersionEdit*> batch_edits;
|
|
autovector<Version*> versions;
|
|
autovector<const MutableCFOptions*> mutable_cf_options_ptrs;
|
|
std::vector<std::unique_ptr<BaseReferencedVersionBuilder>> builder_guards;
|
|
|
|
if (first_writer.edit_list.front()->IsColumnFamilyManipulation()) {
|
|
// No group commits for column family add or drop
|
|
LogAndApplyCFHelper(first_writer.edit_list.front());
|
|
batch_edits.push_back(first_writer.edit_list.front());
|
|
} else {
|
|
auto it = manifest_writers_.cbegin();
|
|
while (it != manifest_writers_.cend()) {
|
|
if ((*it)->edit_list.front()->IsColumnFamilyManipulation()) {
|
|
// no group commits for column family add or drop
|
|
break;
|
|
}
|
|
last_writer = *(it++);
|
|
assert(last_writer != nullptr);
|
|
assert(last_writer->cfd != nullptr);
|
|
if (last_writer->cfd != nullptr && last_writer->cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
// We do a linear search on versions because versions is small.
|
|
// TODO(yanqin) maybe consider unordered_map
|
|
Version* version = nullptr;
|
|
VersionBuilder* builder = nullptr;
|
|
for (int i = 0; i != static_cast<int>(versions.size()); ++i) {
|
|
uint32_t cf_id = last_writer->cfd->GetID();
|
|
if (versions[i]->cfd()->GetID() == cf_id) {
|
|
version = versions[i];
|
|
assert(!builder_guards.empty() &&
|
|
builder_guards.size() == versions.size());
|
|
builder = builder_guards[i]->version_builder();
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"VersionSet::ProcessManifestWrites:SameColumnFamily", &cf_id);
|
|
break;
|
|
}
|
|
}
|
|
if (version == nullptr) {
|
|
version = new Version(last_writer->cfd, this, env_options_,
|
|
last_writer->mutable_cf_options,
|
|
current_version_number_++);
|
|
versions.push_back(version);
|
|
mutable_cf_options_ptrs.push_back(&last_writer->mutable_cf_options);
|
|
builder_guards.emplace_back(
|
|
new BaseReferencedVersionBuilder(last_writer->cfd));
|
|
builder = builder_guards.back()->version_builder();
|
|
}
|
|
assert(builder != nullptr); // make checker happy
|
|
for (const auto& e : last_writer->edit_list) {
|
|
LogAndApplyHelper(last_writer->cfd, builder, version, e, mu);
|
|
batch_edits.push_back(e);
|
|
}
|
|
}
|
|
for (int i = 0; i < static_cast<int>(versions.size()); ++i) {
|
|
assert(!builder_guards.empty() &&
|
|
builder_guards.size() == versions.size());
|
|
auto* builder = builder_guards[i]->version_builder();
|
|
builder->SaveTo(versions[i]->storage_info());
|
|
}
|
|
}
|
|
|
|
uint64_t new_manifest_file_size = 0;
|
|
Status s;
|
|
|
|
assert(pending_manifest_file_number_ == 0);
|
|
if (!descriptor_log_ ||
|
|
manifest_file_size_ > db_options_->max_manifest_file_size) {
|
|
pending_manifest_file_number_ = NewFileNumber();
|
|
batch_edits.back()->SetNextFile(next_file_number_.load());
|
|
new_descriptor_log = true;
|
|
} else {
|
|
pending_manifest_file_number_ = manifest_file_number_;
|
|
}
|
|
|
|
if (new_descriptor_log) {
|
|
// if we are writing out new snapshot make sure to persist max column
|
|
// family.
|
|
if (column_family_set_->GetMaxColumnFamily() > 0) {
|
|
first_writer.edit_list.front()->SetMaxColumnFamily(
|
|
column_family_set_->GetMaxColumnFamily());
|
|
}
|
|
}
|
|
|
|
{
|
|
EnvOptions opt_env_opts = env_->OptimizeForManifestWrite(env_options_);
|
|
mu->Unlock();
|
|
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply:WriteManifest");
|
|
if (!first_writer.edit_list.front()->IsColumnFamilyManipulation() &&
|
|
column_family_set_->get_table_cache()->GetCapacity() ==
|
|
TableCache::kInfiniteCapacity) {
|
|
for (int i = 0; i < static_cast<int>(versions.size()); ++i) {
|
|
assert(!builder_guards.empty() &&
|
|
builder_guards.size() == versions.size());
|
|
assert(!mutable_cf_options_ptrs.empty() &&
|
|
builder_guards.size() == versions.size());
|
|
ColumnFamilyData* cfd = versions[i]->cfd_;
|
|
builder_guards[i]->version_builder()->LoadTableHandlers(
|
|
cfd->internal_stats(), cfd->ioptions()->optimize_filters_for_hits,
|
|
true /* prefetch_index_and_filter_in_cache */,
|
|
mutable_cf_options_ptrs[i]->prefix_extractor.get());
|
|
}
|
|
}
|
|
|
|
// This is fine because everything inside of this block is serialized --
|
|
// only one thread can be here at the same time
|
|
if (new_descriptor_log) {
|
|
// create new manifest file
|
|
ROCKS_LOG_INFO(db_options_->info_log, "Creating manifest %" PRIu64 "\n",
|
|
pending_manifest_file_number_);
|
|
std::string descriptor_fname =
|
|
DescriptorFileName(dbname_, pending_manifest_file_number_);
|
|
unique_ptr<WritableFile> descriptor_file;
|
|
s = NewWritableFile(env_, descriptor_fname, &descriptor_file,
|
|
opt_env_opts);
|
|
if (s.ok()) {
|
|
descriptor_file->SetPreallocationBlockSize(
|
|
db_options_->manifest_preallocation_size);
|
|
|
|
unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
|
|
std::move(descriptor_file), descriptor_fname, opt_env_opts, nullptr,
|
|
db_options_->listeners));
|
|
descriptor_log_.reset(
|
|
new log::Writer(std::move(file_writer), 0, false));
|
|
s = WriteSnapshot(descriptor_log_.get());
|
|
}
|
|
}
|
|
|
|
if (!first_writer.edit_list.front()->IsColumnFamilyManipulation()) {
|
|
for (int i = 0; i < static_cast<int>(versions.size()); ++i) {
|
|
versions[i]->PrepareApply(*mutable_cf_options_ptrs[i], true);
|
|
}
|
|
}
|
|
|
|
// Write new records to MANIFEST log
|
|
if (s.ok()) {
|
|
for (auto& e : batch_edits) {
|
|
std::string record;
|
|
if (!e->EncodeTo(&record)) {
|
|
s = Status::Corruption("Unable to encode VersionEdit:" +
|
|
e->DebugString(true));
|
|
break;
|
|
}
|
|
TEST_KILL_RANDOM("VersionSet::LogAndApply:BeforeAddRecord",
|
|
rocksdb_kill_odds * REDUCE_ODDS2);
|
|
s = descriptor_log_->AddRecord(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
s = SyncManifest(env_, db_options_, descriptor_log_->file());
|
|
}
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(db_options_->info_log, "MANIFEST write %s\n",
|
|
s.ToString().c_str());
|
|
}
|
|
}
|
|
|
|
// If we just created a new descriptor file, install it by writing a
|
|
// new CURRENT file that points to it.
|
|
if (s.ok() && new_descriptor_log) {
|
|
s = SetCurrentFile(env_, dbname_, pending_manifest_file_number_,
|
|
db_directory);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
// find offset in manifest file where this version is stored.
|
|
new_manifest_file_size = descriptor_log_->file()->GetFileSize();
|
|
}
|
|
|
|
if (first_writer.edit_list.front()->is_column_family_drop_) {
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply::ColumnFamilyDrop:0");
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply::ColumnFamilyDrop:1");
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply::ColumnFamilyDrop:2");
|
|
}
|
|
|
|
LogFlush(db_options_->info_log);
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply:WriteManifestDone");
|
|
mu->Lock();
|
|
}
|
|
|
|
// Append the old manifest file to the obsolete_manifest_ list to be deleted
|
|
// by PurgeObsoleteFiles later.
|
|
if (s.ok() && new_descriptor_log) {
|
|
obsolete_manifests_.emplace_back(
|
|
DescriptorFileName("", manifest_file_number_));
|
|
}
|
|
|
|
// Install the new versions
|
|
if (s.ok()) {
|
|
if (first_writer.edit_list.front()->is_column_family_add_) {
|
|
assert(batch_edits.size() == 1);
|
|
assert(new_cf_options != nullptr);
|
|
CreateColumnFamily(*new_cf_options, first_writer.edit_list.front());
|
|
} else if (first_writer.edit_list.front()->is_column_family_drop_) {
|
|
assert(batch_edits.size() == 1);
|
|
first_writer.cfd->SetDropped();
|
|
if (first_writer.cfd->Unref()) {
|
|
delete first_writer.cfd;
|
|
}
|
|
} else {
|
|
// Each version in versions corresponds to a column family.
|
|
// For each column family, update its log number indicating that logs
|
|
// with number smaller than this should be ignored.
|
|
for (const auto version : versions) {
|
|
uint64_t max_log_number_in_batch = 0;
|
|
uint32_t cf_id = version->cfd_->GetID();
|
|
for (const auto& e : batch_edits) {
|
|
if (e->has_log_number_ && e->column_family_ == cf_id) {
|
|
max_log_number_in_batch =
|
|
std::max(max_log_number_in_batch, e->log_number_);
|
|
}
|
|
}
|
|
if (max_log_number_in_batch != 0) {
|
|
assert(version->cfd_->GetLogNumber() <= max_log_number_in_batch);
|
|
version->cfd_->SetLogNumber(max_log_number_in_batch);
|
|
}
|
|
}
|
|
|
|
uint64_t last_min_log_number_to_keep = 0;
|
|
for (auto& e : batch_edits) {
|
|
if (e->has_min_log_number_to_keep_) {
|
|
last_min_log_number_to_keep =
|
|
std::max(last_min_log_number_to_keep, e->min_log_number_to_keep_);
|
|
}
|
|
}
|
|
|
|
if (last_min_log_number_to_keep != 0) {
|
|
// Should only be set in 2PC mode.
|
|
MarkMinLogNumberToKeep2PC(last_min_log_number_to_keep);
|
|
}
|
|
|
|
for (int i = 0; i < static_cast<int>(versions.size()); ++i) {
|
|
ColumnFamilyData* cfd = versions[i]->cfd_;
|
|
AppendVersion(cfd, versions[i]);
|
|
}
|
|
}
|
|
manifest_file_number_ = pending_manifest_file_number_;
|
|
manifest_file_size_ = new_manifest_file_size;
|
|
prev_log_number_ = first_writer.edit_list.front()->prev_log_number_;
|
|
} else {
|
|
std::string version_edits;
|
|
for (auto& e : batch_edits) {
|
|
version_edits += ("\n" + e->DebugString(true));
|
|
}
|
|
ROCKS_LOG_ERROR(db_options_->info_log,
|
|
"Error in committing version edit to MANIFEST: %s",
|
|
version_edits.c_str());
|
|
for (auto v : versions) {
|
|
delete v;
|
|
}
|
|
if (new_descriptor_log) {
|
|
ROCKS_LOG_INFO(db_options_->info_log,
|
|
"Deleting manifest %" PRIu64 " current manifest %" PRIu64
|
|
"\n",
|
|
manifest_file_number_, pending_manifest_file_number_);
|
|
descriptor_log_.reset();
|
|
env_->DeleteFile(
|
|
DescriptorFileName(dbname_, pending_manifest_file_number_));
|
|
}
|
|
}
|
|
|
|
pending_manifest_file_number_ = 0;
|
|
|
|
// wake up all the waiting writers
|
|
while (true) {
|
|
ManifestWriter* ready = manifest_writers_.front();
|
|
manifest_writers_.pop_front();
|
|
bool need_signal = true;
|
|
for (const auto& w : writers) {
|
|
if (&w == ready) {
|
|
need_signal = false;
|
|
break;
|
|
}
|
|
}
|
|
ready->status = s;
|
|
ready->done = true;
|
|
if (need_signal) {
|
|
ready->cv.Signal();
|
|
}
|
|
if (ready == last_writer) {
|
|
break;
|
|
}
|
|
}
|
|
if (!manifest_writers_.empty()) {
|
|
manifest_writers_.front()->cv.Signal();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// 'datas' is gramatically incorrect. We still use this notation is to indicate
|
|
// that this variable represents a collection of column_family_data.
|
|
Status VersionSet::LogAndApply(
|
|
const autovector<ColumnFamilyData*>& column_family_datas,
|
|
const autovector<const MutableCFOptions*>& mutable_cf_options_list,
|
|
const autovector<autovector<VersionEdit*>>& edit_lists,
|
|
InstrumentedMutex* mu, Directory* db_directory, bool new_descriptor_log,
|
|
const ColumnFamilyOptions* new_cf_options) {
|
|
mu->AssertHeld();
|
|
int num_edits = 0;
|
|
for (const auto& elist : edit_lists) {
|
|
num_edits += static_cast<int>(elist.size());
|
|
}
|
|
if (num_edits == 0) {
|
|
return Status::OK();
|
|
} else if (num_edits > 1) {
|
|
#ifndef NDEBUG
|
|
for (const auto& edit_list : edit_lists) {
|
|
for (const auto& edit : edit_list) {
|
|
assert(!edit->IsColumnFamilyManipulation());
|
|
}
|
|
}
|
|
#endif /* ! NDEBUG */
|
|
}
|
|
|
|
int num_cfds = static_cast<int>(column_family_datas.size());
|
|
if (num_cfds == 1 && column_family_datas[0] == nullptr) {
|
|
assert(edit_lists.size() == 1 && edit_lists[0].size() == 1);
|
|
assert(edit_lists[0][0]->is_column_family_add_);
|
|
assert(new_cf_options != nullptr);
|
|
}
|
|
std::deque<ManifestWriter> writers;
|
|
if (num_cfds > 0) {
|
|
assert(static_cast<size_t>(num_cfds) == mutable_cf_options_list.size());
|
|
assert(static_cast<size_t>(num_cfds) == edit_lists.size());
|
|
}
|
|
for (int i = 0; i < num_cfds; ++i) {
|
|
writers.emplace_back(mu, column_family_datas[i],
|
|
*mutable_cf_options_list[i], edit_lists[i]);
|
|
manifest_writers_.push_back(&writers[i]);
|
|
}
|
|
assert(!writers.empty());
|
|
ManifestWriter& first_writer = writers.front();
|
|
while (!first_writer.done && &first_writer != manifest_writers_.front()) {
|
|
first_writer.cv.Wait();
|
|
}
|
|
if (first_writer.done) {
|
|
// All non-CF-manipulation operations can be grouped together and committed
|
|
// to MANIFEST. They should all have finished. The status code is stored in
|
|
// the first manifest writer.
|
|
#ifndef NDEBUG
|
|
for (const auto& writer : writers) {
|
|
assert(writer.done);
|
|
}
|
|
#endif /* !NDEBUG */
|
|
return first_writer.status;
|
|
}
|
|
|
|
int num_undropped_cfds = 0;
|
|
for (auto cfd : column_family_datas) {
|
|
// if cfd == nullptr, it is a column family add.
|
|
if (cfd == nullptr || !cfd->IsDropped()) {
|
|
++num_undropped_cfds;
|
|
}
|
|
}
|
|
if (0 == num_undropped_cfds) {
|
|
// TODO (yanqin) maybe use a different status code to denote column family
|
|
// drop other than OK and ShutdownInProgress
|
|
for (int i = 0; i != num_cfds; ++i) {
|
|
manifest_writers_.pop_front();
|
|
}
|
|
// Notify new head of manifest write queue.
|
|
if (!manifest_writers_.empty()) {
|
|
manifest_writers_.front()->cv.Signal();
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
return ProcessManifestWrites(writers, mu, db_directory, new_descriptor_log,
|
|
new_cf_options);
|
|
}
|
|
|
|
void VersionSet::LogAndApplyCFHelper(VersionEdit* edit) {
|
|
assert(edit->IsColumnFamilyManipulation());
|
|
edit->SetNextFile(next_file_number_.load());
|
|
// The log might have data that is not visible to memtbale and hence have not
|
|
// updated the last_sequence_ yet. It is also possible that the log has is
|
|
// expecting some new data that is not written yet. Since LastSequence is an
|
|
// upper bound on the sequence, it is ok to record
|
|
// last_allocated_sequence_ as the last sequence.
|
|
edit->SetLastSequence(db_options_->two_write_queues ? last_allocated_sequence_
|
|
: last_sequence_);
|
|
if (edit->is_column_family_drop_) {
|
|
// if we drop column family, we have to make sure to save max column family,
|
|
// so that we don't reuse existing ID
|
|
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
|
|
}
|
|
}
|
|
|
|
void VersionSet::LogAndApplyHelper(ColumnFamilyData* cfd,
|
|
VersionBuilder* builder, Version* /*v*/,
|
|
VersionEdit* edit, InstrumentedMutex* mu) {
|
|
#ifdef NDEBUG
|
|
(void)cfd;
|
|
#endif
|
|
mu->AssertHeld();
|
|
assert(!edit->IsColumnFamilyManipulation());
|
|
|
|
if (edit->has_log_number_) {
|
|
assert(edit->log_number_ >= cfd->GetLogNumber());
|
|
assert(edit->log_number_ < next_file_number_.load());
|
|
}
|
|
|
|
if (!edit->has_prev_log_number_) {
|
|
edit->SetPrevLogNumber(prev_log_number_);
|
|
}
|
|
edit->SetNextFile(next_file_number_.load());
|
|
// The log might have data that is not visible to memtbale and hence have not
|
|
// updated the last_sequence_ yet. It is also possible that the log has is
|
|
// expecting some new data that is not written yet. Since LastSequence is an
|
|
// upper bound on the sequence, it is ok to record
|
|
// last_allocated_sequence_ as the last sequence.
|
|
edit->SetLastSequence(db_options_->two_write_queues ? last_allocated_sequence_
|
|
: last_sequence_);
|
|
|
|
builder->Apply(edit);
|
|
}
|
|
|
|
Status VersionSet::ApplyOneVersionEdit(
|
|
VersionEdit& edit,
|
|
const std::unordered_map<std::string, ColumnFamilyOptions>& name_to_options,
|
|
std::unordered_map<int, std::string>& column_families_not_found,
|
|
std::unordered_map<uint32_t, BaseReferencedVersionBuilder*>& builders,
|
|
bool* have_log_number, uint64_t* /* log_number */,
|
|
bool* have_prev_log_number, uint64_t* previous_log_number,
|
|
bool* have_next_file, uint64_t* next_file, bool* have_last_sequence,
|
|
SequenceNumber* last_sequence, uint64_t* min_log_number_to_keep,
|
|
uint32_t* max_column_family) {
|
|
// Not found means that user didn't supply that column
|
|
// family option AND we encountered column family add
|
|
// record. Once we encounter column family drop record,
|
|
// we will delete the column family from
|
|
// column_families_not_found.
|
|
bool cf_in_not_found = (column_families_not_found.find(edit.column_family_) !=
|
|
column_families_not_found.end());
|
|
// in builders means that user supplied that column family
|
|
// option AND that we encountered column family add record
|
|
bool cf_in_builders = builders.find(edit.column_family_) != builders.end();
|
|
|
|
// they can't both be true
|
|
assert(!(cf_in_not_found && cf_in_builders));
|
|
|
|
ColumnFamilyData* cfd = nullptr;
|
|
|
|
if (edit.is_column_family_add_) {
|
|
if (cf_in_builders || cf_in_not_found) {
|
|
return Status::Corruption(
|
|
"Manifest adding the same column family twice: " +
|
|
edit.column_family_name_);
|
|
}
|
|
auto cf_options = name_to_options.find(edit.column_family_name_);
|
|
if (cf_options == name_to_options.end()) {
|
|
column_families_not_found.insert(
|
|
{edit.column_family_, edit.column_family_name_});
|
|
} else {
|
|
cfd = CreateColumnFamily(cf_options->second, &edit);
|
|
cfd->set_initialized();
|
|
builders.insert(
|
|
{edit.column_family_, new BaseReferencedVersionBuilder(cfd)});
|
|
}
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (cf_in_builders) {
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
delete builder->second;
|
|
builders.erase(builder);
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
assert(cfd != nullptr);
|
|
if (cfd->Unref()) {
|
|
delete cfd;
|
|
cfd = nullptr;
|
|
} else {
|
|
// who else can have reference to cfd!?
|
|
assert(false);
|
|
}
|
|
} else if (cf_in_not_found) {
|
|
column_families_not_found.erase(edit.column_family_);
|
|
} else {
|
|
return Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
}
|
|
} else if (!cf_in_not_found) {
|
|
if (!cf_in_builders) {
|
|
return Status::Corruption(
|
|
"Manifest record referencing unknown column family");
|
|
}
|
|
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
// this should never happen since cf_in_builders is true
|
|
assert(cfd != nullptr);
|
|
|
|
// if it is not column family add or column family drop,
|
|
// then it's a file add/delete, which should be forwarded
|
|
// to builder
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
builder->second->version_builder()->Apply(&edit);
|
|
}
|
|
|
|
if (cfd != nullptr) {
|
|
if (edit.has_log_number_) {
|
|
if (cfd->GetLogNumber() > edit.log_number_) {
|
|
ROCKS_LOG_WARN(
|
|
db_options_->info_log,
|
|
"MANIFEST corruption detected, but ignored - Log numbers in "
|
|
"records NOT monotonically increasing");
|
|
} else {
|
|
cfd->SetLogNumber(edit.log_number_);
|
|
*have_log_number = true;
|
|
}
|
|
}
|
|
if (edit.has_comparator_ &&
|
|
edit.comparator_ != cfd->user_comparator()->Name()) {
|
|
return Status::InvalidArgument(
|
|
cfd->user_comparator()->Name(),
|
|
"does not match existing comparator " + edit.comparator_);
|
|
}
|
|
}
|
|
|
|
if (edit.has_prev_log_number_) {
|
|
*previous_log_number = edit.prev_log_number_;
|
|
*have_prev_log_number = true;
|
|
}
|
|
|
|
if (edit.has_next_file_number_) {
|
|
*next_file = edit.next_file_number_;
|
|
*have_next_file = true;
|
|
}
|
|
|
|
if (edit.has_max_column_family_) {
|
|
*max_column_family = edit.max_column_family_;
|
|
}
|
|
|
|
if (edit.has_min_log_number_to_keep_) {
|
|
*min_log_number_to_keep =
|
|
std::max(*min_log_number_to_keep, edit.min_log_number_to_keep_);
|
|
}
|
|
|
|
if (edit.has_last_sequence_) {
|
|
*last_sequence = edit.last_sequence_;
|
|
*have_last_sequence = true;
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status VersionSet::Recover(
|
|
const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
bool read_only) {
|
|
std::unordered_map<std::string, ColumnFamilyOptions> cf_name_to_options;
|
|
for (auto cf : column_families) {
|
|
cf_name_to_options.insert({cf.name, cf.options});
|
|
}
|
|
// keeps track of column families in manifest that were not found in
|
|
// column families parameters. if those column families are not dropped
|
|
// by subsequent manifest records, Recover() will return failure status
|
|
std::unordered_map<int, std::string> column_families_not_found;
|
|
|
|
// Read "CURRENT" file, which contains a pointer to the current manifest file
|
|
std::string manifest_filename;
|
|
Status s = ReadFileToString(
|
|
env_, CurrentFileName(dbname_), &manifest_filename
|
|
);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (manifest_filename.empty() ||
|
|
manifest_filename.back() != '\n') {
|
|
return Status::Corruption("CURRENT file does not end with newline");
|
|
}
|
|
// remove the trailing '\n'
|
|
manifest_filename.resize(manifest_filename.size() - 1);
|
|
FileType type;
|
|
bool parse_ok =
|
|
ParseFileName(manifest_filename, &manifest_file_number_, &type);
|
|
if (!parse_ok || type != kDescriptorFile) {
|
|
return Status::Corruption("CURRENT file corrupted");
|
|
}
|
|
|
|
ROCKS_LOG_INFO(db_options_->info_log, "Recovering from manifest file: %s\n",
|
|
manifest_filename.c_str());
|
|
|
|
manifest_filename = dbname_ + "/" + manifest_filename;
|
|
unique_ptr<SequentialFileReader> manifest_file_reader;
|
|
{
|
|
unique_ptr<SequentialFile> manifest_file;
|
|
s = env_->NewSequentialFile(manifest_filename, &manifest_file,
|
|
env_->OptimizeForManifestRead(env_options_));
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
manifest_file_reader.reset(
|
|
new SequentialFileReader(std::move(manifest_file), manifest_filename));
|
|
}
|
|
uint64_t current_manifest_file_size;
|
|
s = env_->GetFileSize(manifest_filename, ¤t_manifest_file_size);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
bool have_log_number = false;
|
|
bool have_prev_log_number = false;
|
|
bool have_next_file = false;
|
|
bool have_last_sequence = false;
|
|
uint64_t next_file = 0;
|
|
uint64_t last_sequence = 0;
|
|
uint64_t log_number = 0;
|
|
uint64_t previous_log_number = 0;
|
|
uint32_t max_column_family = 0;
|
|
uint64_t min_log_number_to_keep = 0;
|
|
std::unordered_map<uint32_t, BaseReferencedVersionBuilder*> builders;
|
|
|
|
// add default column family
|
|
auto default_cf_iter = cf_name_to_options.find(kDefaultColumnFamilyName);
|
|
if (default_cf_iter == cf_name_to_options.end()) {
|
|
return Status::InvalidArgument("Default column family not specified");
|
|
}
|
|
VersionEdit default_cf_edit;
|
|
default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName);
|
|
default_cf_edit.SetColumnFamily(0);
|
|
ColumnFamilyData* default_cfd =
|
|
CreateColumnFamily(default_cf_iter->second, &default_cf_edit);
|
|
// In recovery, nobody else can access it, so it's fine to set it to be
|
|
// initialized earlier.
|
|
default_cfd->set_initialized();
|
|
builders.insert({0, new BaseReferencedVersionBuilder(default_cfd)});
|
|
|
|
{
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(nullptr, std::move(manifest_file_reader), &reporter,
|
|
true /* checksum */, 0 /* log_number */,
|
|
false /* retry_after_eof */);
|
|
Slice record;
|
|
std::string scratch;
|
|
std::vector<VersionEdit> replay_buffer;
|
|
size_t num_entries_decoded = 0;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
if (edit.is_in_atomic_group_) {
|
|
if (replay_buffer.empty()) {
|
|
replay_buffer.resize(edit.remaining_entries_ + 1);
|
|
}
|
|
++num_entries_decoded;
|
|
if (num_entries_decoded + edit.remaining_entries_ !=
|
|
static_cast<uint32_t>(replay_buffer.size())) {
|
|
return Status::Corruption("corrupted atomic group");
|
|
}
|
|
replay_buffer[num_entries_decoded - 1] = std::move(edit);
|
|
if (num_entries_decoded == replay_buffer.size()) {
|
|
for (auto& e : replay_buffer) {
|
|
s = ApplyOneVersionEdit(
|
|
e, cf_name_to_options, column_families_not_found, builders,
|
|
&have_log_number, &log_number, &have_prev_log_number,
|
|
&previous_log_number, &have_next_file, &next_file,
|
|
&have_last_sequence, &last_sequence, &min_log_number_to_keep,
|
|
&max_column_family);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
replay_buffer.clear();
|
|
num_entries_decoded = 0;
|
|
}
|
|
} else {
|
|
if (!replay_buffer.empty()) {
|
|
return Status::Corruption("corrupted atomic group");
|
|
}
|
|
s = ApplyOneVersionEdit(
|
|
edit, cf_name_to_options, column_families_not_found, builders,
|
|
&have_log_number, &log_number, &have_prev_log_number,
|
|
&previous_log_number, &have_next_file, &next_file,
|
|
&have_last_sequence, &last_sequence, &min_log_number_to_keep,
|
|
&max_column_family);
|
|
}
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
if (!have_next_file) {
|
|
s = Status::Corruption("no meta-nextfile entry in descriptor");
|
|
} else if (!have_log_number) {
|
|
s = Status::Corruption("no meta-lognumber entry in descriptor");
|
|
} else if (!have_last_sequence) {
|
|
s = Status::Corruption("no last-sequence-number entry in descriptor");
|
|
}
|
|
|
|
if (!have_prev_log_number) {
|
|
previous_log_number = 0;
|
|
}
|
|
|
|
column_family_set_->UpdateMaxColumnFamily(max_column_family);
|
|
|
|
// When reading DB generated using old release, min_log_number_to_keep=0.
|
|
// All log files will be scanned for potential prepare entries.
|
|
MarkMinLogNumberToKeep2PC(min_log_number_to_keep);
|
|
MarkFileNumberUsed(previous_log_number);
|
|
MarkFileNumberUsed(log_number);
|
|
}
|
|
|
|
// there were some column families in the MANIFEST that weren't specified
|
|
// in the argument. This is OK in read_only mode
|
|
if (read_only == false && !column_families_not_found.empty()) {
|
|
std::string list_of_not_found;
|
|
for (const auto& cf : column_families_not_found) {
|
|
list_of_not_found += ", " + cf.second;
|
|
}
|
|
list_of_not_found = list_of_not_found.substr(2);
|
|
s = Status::InvalidArgument(
|
|
"You have to open all column families. Column families not opened: " +
|
|
list_of_not_found);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *column_family_set_) {
|
|
assert(builders.count(cfd->GetID()) > 0);
|
|
auto* builder = builders[cfd->GetID()]->version_builder();
|
|
if (!builder->CheckConsistencyForNumLevels()) {
|
|
s = Status::InvalidArgument(
|
|
"db has more levels than options.num_levels");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
if (read_only) {
|
|
cfd->table_cache()->SetTablesAreImmortal();
|
|
}
|
|
assert(cfd->initialized());
|
|
auto builders_iter = builders.find(cfd->GetID());
|
|
assert(builders_iter != builders.end());
|
|
auto* builder = builders_iter->second->version_builder();
|
|
|
|
if (GetColumnFamilySet()->get_table_cache()->GetCapacity() ==
|
|
TableCache::kInfiniteCapacity) {
|
|
// unlimited table cache. Pre-load table handle now.
|
|
// Need to do it out of the mutex.
|
|
builder->LoadTableHandlers(
|
|
cfd->internal_stats(), db_options_->max_file_opening_threads,
|
|
false /* prefetch_index_and_filter_in_cache */,
|
|
cfd->GetLatestMutableCFOptions()->prefix_extractor.get());
|
|
}
|
|
|
|
Version* v = new Version(cfd, this, env_options_,
|
|
*cfd->GetLatestMutableCFOptions(),
|
|
current_version_number_++);
|
|
builder->SaveTo(v->storage_info());
|
|
|
|
// Install recovered version
|
|
v->PrepareApply(*cfd->GetLatestMutableCFOptions(),
|
|
!(db_options_->skip_stats_update_on_db_open));
|
|
AppendVersion(cfd, v);
|
|
}
|
|
|
|
manifest_file_size_ = current_manifest_file_size;
|
|
next_file_number_.store(next_file + 1);
|
|
last_allocated_sequence_ = last_sequence;
|
|
last_published_sequence_ = last_sequence;
|
|
last_sequence_ = last_sequence;
|
|
prev_log_number_ = previous_log_number;
|
|
|
|
ROCKS_LOG_INFO(
|
|
db_options_->info_log,
|
|
"Recovered from manifest file:%s succeeded,"
|
|
"manifest_file_number is %lu, next_file_number is %lu, "
|
|
"last_sequence is %lu, log_number is %lu,"
|
|
"prev_log_number is %lu,"
|
|
"max_column_family is %u,"
|
|
"min_log_number_to_keep is %lu\n",
|
|
manifest_filename.c_str(), (unsigned long)manifest_file_number_,
|
|
(unsigned long)next_file_number_.load(), (unsigned long)last_sequence_,
|
|
(unsigned long)log_number, (unsigned long)prev_log_number_,
|
|
column_family_set_->GetMaxColumnFamily(), min_log_number_to_keep_2pc());
|
|
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
ROCKS_LOG_INFO(db_options_->info_log,
|
|
"Column family [%s] (ID %u), log number is %" PRIu64 "\n",
|
|
cfd->GetName().c_str(), cfd->GetID(), cfd->GetLogNumber());
|
|
}
|
|
}
|
|
|
|
for (auto& builder : builders) {
|
|
delete builder.second;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status VersionSet::ListColumnFamilies(std::vector<std::string>* column_families,
|
|
const std::string& dbname, Env* env) {
|
|
// these are just for performance reasons, not correcntes,
|
|
// so we're fine using the defaults
|
|
EnvOptions soptions;
|
|
// Read "CURRENT" file, which contains a pointer to the current manifest file
|
|
std::string current;
|
|
Status s = ReadFileToString(env, CurrentFileName(dbname), ¤t);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (current.empty() || current[current.size()-1] != '\n') {
|
|
return Status::Corruption("CURRENT file does not end with newline");
|
|
}
|
|
current.resize(current.size() - 1);
|
|
|
|
std::string dscname = dbname + "/" + current;
|
|
|
|
unique_ptr<SequentialFileReader> file_reader;
|
|
{
|
|
unique_ptr<SequentialFile> file;
|
|
s = env->NewSequentialFile(dscname, &file, soptions);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
file_reader.reset(new SequentialFileReader(std::move(file), dscname));
|
|
}
|
|
|
|
std::map<uint32_t, std::string> column_family_names;
|
|
// default column family is always implicitly there
|
|
column_family_names.insert({0, kDefaultColumnFamilyName});
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(nullptr, std::move(file_reader), &reporter,
|
|
true /* checksum */, 0 /* log_number */,
|
|
false /* retry_after_eof */);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
if (edit.is_column_family_add_) {
|
|
if (column_family_names.find(edit.column_family_) !=
|
|
column_family_names.end()) {
|
|
s = Status::Corruption("Manifest adding the same column family twice");
|
|
break;
|
|
}
|
|
column_family_names.insert(
|
|
{edit.column_family_, edit.column_family_name_});
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (column_family_names.find(edit.column_family_) ==
|
|
column_family_names.end()) {
|
|
s = Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
break;
|
|
}
|
|
column_family_names.erase(edit.column_family_);
|
|
}
|
|
}
|
|
|
|
column_families->clear();
|
|
if (s.ok()) {
|
|
for (const auto& iter : column_family_names) {
|
|
column_families->push_back(iter.second);
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
Status VersionSet::ReduceNumberOfLevels(const std::string& dbname,
|
|
const Options* options,
|
|
const EnvOptions& env_options,
|
|
int new_levels) {
|
|
if (new_levels <= 1) {
|
|
return Status::InvalidArgument(
|
|
"Number of levels needs to be bigger than 1");
|
|
}
|
|
|
|
ImmutableDBOptions db_options(*options);
|
|
ColumnFamilyOptions cf_options(*options);
|
|
std::shared_ptr<Cache> tc(NewLRUCache(options->max_open_files - 10,
|
|
options->table_cache_numshardbits));
|
|
WriteController wc(options->delayed_write_rate);
|
|
WriteBufferManager wb(options->db_write_buffer_size);
|
|
VersionSet versions(dbname, &db_options, env_options, tc.get(), &wb, &wc);
|
|
Status status;
|
|
|
|
std::vector<ColumnFamilyDescriptor> dummy;
|
|
ColumnFamilyDescriptor dummy_descriptor(kDefaultColumnFamilyName,
|
|
ColumnFamilyOptions(*options));
|
|
dummy.push_back(dummy_descriptor);
|
|
status = versions.Recover(dummy);
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
|
|
Version* current_version =
|
|
versions.GetColumnFamilySet()->GetDefault()->current();
|
|
auto* vstorage = current_version->storage_info();
|
|
int current_levels = vstorage->num_levels();
|
|
|
|
if (current_levels <= new_levels) {
|
|
return Status::OK();
|
|
}
|
|
|
|
// Make sure there are file only on one level from
|
|
// (new_levels-1) to (current_levels-1)
|
|
int first_nonempty_level = -1;
|
|
int first_nonempty_level_filenum = 0;
|
|
for (int i = new_levels - 1; i < current_levels; i++) {
|
|
int file_num = vstorage->NumLevelFiles(i);
|
|
if (file_num != 0) {
|
|
if (first_nonempty_level < 0) {
|
|
first_nonempty_level = i;
|
|
first_nonempty_level_filenum = file_num;
|
|
} else {
|
|
char msg[255];
|
|
snprintf(msg, sizeof(msg),
|
|
"Found at least two levels containing files: "
|
|
"[%d:%d],[%d:%d].\n",
|
|
first_nonempty_level, first_nonempty_level_filenum, i,
|
|
file_num);
|
|
return Status::InvalidArgument(msg);
|
|
}
|
|
}
|
|
}
|
|
|
|
// we need to allocate an array with the old number of levels size to
|
|
// avoid SIGSEGV in WriteSnapshot()
|
|
// however, all levels bigger or equal to new_levels will be empty
|
|
std::vector<FileMetaData*>* new_files_list =
|
|
new std::vector<FileMetaData*>[current_levels];
|
|
for (int i = 0; i < new_levels - 1; i++) {
|
|
new_files_list[i] = vstorage->LevelFiles(i);
|
|
}
|
|
|
|
if (first_nonempty_level > 0) {
|
|
new_files_list[new_levels - 1] = vstorage->LevelFiles(first_nonempty_level);
|
|
}
|
|
|
|
delete[] vstorage -> files_;
|
|
vstorage->files_ = new_files_list;
|
|
vstorage->num_levels_ = new_levels;
|
|
|
|
MutableCFOptions mutable_cf_options(*options);
|
|
VersionEdit ve;
|
|
InstrumentedMutex dummy_mutex;
|
|
InstrumentedMutexLock l(&dummy_mutex);
|
|
return versions.LogAndApply(
|
|
versions.GetColumnFamilySet()->GetDefault(),
|
|
mutable_cf_options, &ve, &dummy_mutex, nullptr, true);
|
|
}
|
|
|
|
Status VersionSet::DumpManifest(Options& options, std::string& dscname,
|
|
bool verbose, bool hex, bool json) {
|
|
// Open the specified manifest file.
|
|
unique_ptr<SequentialFileReader> file_reader;
|
|
Status s;
|
|
{
|
|
unique_ptr<SequentialFile> file;
|
|
s = options.env->NewSequentialFile(
|
|
dscname, &file, env_->OptimizeForManifestRead(env_options_));
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
file_reader.reset(new SequentialFileReader(std::move(file), dscname));
|
|
}
|
|
|
|
bool have_prev_log_number = false;
|
|
bool have_next_file = false;
|
|
bool have_last_sequence = false;
|
|
uint64_t next_file = 0;
|
|
uint64_t last_sequence = 0;
|
|
uint64_t previous_log_number = 0;
|
|
int count = 0;
|
|
std::unordered_map<uint32_t, std::string> comparators;
|
|
std::unordered_map<uint32_t, BaseReferencedVersionBuilder*> builders;
|
|
|
|
// add default column family
|
|
VersionEdit default_cf_edit;
|
|
default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName);
|
|
default_cf_edit.SetColumnFamily(0);
|
|
ColumnFamilyData* default_cfd =
|
|
CreateColumnFamily(ColumnFamilyOptions(options), &default_cf_edit);
|
|
builders.insert({0, new BaseReferencedVersionBuilder(default_cfd)});
|
|
|
|
{
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(nullptr, std::move(file_reader), &reporter,
|
|
true /* checksum */, 0 /* log_number */,
|
|
false /* retry_after_eof */);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
// Write out each individual edit
|
|
if (verbose && !json) {
|
|
printf("%s\n", edit.DebugString(hex).c_str());
|
|
} else if (json) {
|
|
printf("%s\n", edit.DebugJSON(count, hex).c_str());
|
|
}
|
|
count++;
|
|
|
|
bool cf_in_builders =
|
|
builders.find(edit.column_family_) != builders.end();
|
|
|
|
if (edit.has_comparator_) {
|
|
comparators.insert({edit.column_family_, edit.comparator_});
|
|
}
|
|
|
|
ColumnFamilyData* cfd = nullptr;
|
|
|
|
if (edit.is_column_family_add_) {
|
|
if (cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest adding the same column family twice");
|
|
break;
|
|
}
|
|
cfd = CreateColumnFamily(ColumnFamilyOptions(options), &edit);
|
|
cfd->set_initialized();
|
|
builders.insert(
|
|
{edit.column_family_, new BaseReferencedVersionBuilder(cfd)});
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (!cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
break;
|
|
}
|
|
auto builder_iter = builders.find(edit.column_family_);
|
|
delete builder_iter->second;
|
|
builders.erase(builder_iter);
|
|
comparators.erase(edit.column_family_);
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
assert(cfd != nullptr);
|
|
cfd->Unref();
|
|
delete cfd;
|
|
cfd = nullptr;
|
|
} else {
|
|
if (!cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest record referencing unknown column family");
|
|
break;
|
|
}
|
|
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
// this should never happen since cf_in_builders is true
|
|
assert(cfd != nullptr);
|
|
|
|
// if it is not column family add or column family drop,
|
|
// then it's a file add/delete, which should be forwarded
|
|
// to builder
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
builder->second->version_builder()->Apply(&edit);
|
|
}
|
|
|
|
if (cfd != nullptr && edit.has_log_number_) {
|
|
cfd->SetLogNumber(edit.log_number_);
|
|
}
|
|
|
|
|
|
if (edit.has_prev_log_number_) {
|
|
previous_log_number = edit.prev_log_number_;
|
|
have_prev_log_number = true;
|
|
}
|
|
|
|
if (edit.has_next_file_number_) {
|
|
next_file = edit.next_file_number_;
|
|
have_next_file = true;
|
|
}
|
|
|
|
if (edit.has_last_sequence_) {
|
|
last_sequence = edit.last_sequence_;
|
|
have_last_sequence = true;
|
|
}
|
|
|
|
if (edit.has_max_column_family_) {
|
|
column_family_set_->UpdateMaxColumnFamily(edit.max_column_family_);
|
|
}
|
|
|
|
if (edit.has_min_log_number_to_keep_) {
|
|
MarkMinLogNumberToKeep2PC(edit.min_log_number_to_keep_);
|
|
}
|
|
}
|
|
}
|
|
file_reader.reset();
|
|
|
|
if (s.ok()) {
|
|
if (!have_next_file) {
|
|
s = Status::Corruption("no meta-nextfile entry in descriptor");
|
|
printf("no meta-nextfile entry in descriptor");
|
|
} else if (!have_last_sequence) {
|
|
printf("no last-sequence-number entry in descriptor");
|
|
s = Status::Corruption("no last-sequence-number entry in descriptor");
|
|
}
|
|
|
|
if (!have_prev_log_number) {
|
|
previous_log_number = 0;
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
auto builders_iter = builders.find(cfd->GetID());
|
|
assert(builders_iter != builders.end());
|
|
auto builder = builders_iter->second->version_builder();
|
|
|
|
Version* v = new Version(cfd, this, env_options_,
|
|
*cfd->GetLatestMutableCFOptions(),
|
|
current_version_number_++);
|
|
builder->SaveTo(v->storage_info());
|
|
v->PrepareApply(*cfd->GetLatestMutableCFOptions(), false);
|
|
|
|
printf("--------------- Column family \"%s\" (ID %u) --------------\n",
|
|
cfd->GetName().c_str(), (unsigned int)cfd->GetID());
|
|
printf("log number: %lu\n", (unsigned long)cfd->GetLogNumber());
|
|
auto comparator = comparators.find(cfd->GetID());
|
|
if (comparator != comparators.end()) {
|
|
printf("comparator: %s\n", comparator->second.c_str());
|
|
} else {
|
|
printf("comparator: <NO COMPARATOR>\n");
|
|
}
|
|
printf("%s \n", v->DebugString(hex).c_str());
|
|
delete v;
|
|
}
|
|
|
|
// Free builders
|
|
for (auto& builder : builders) {
|
|
delete builder.second;
|
|
}
|
|
|
|
next_file_number_.store(next_file + 1);
|
|
last_allocated_sequence_ = last_sequence;
|
|
last_published_sequence_ = last_sequence;
|
|
last_sequence_ = last_sequence;
|
|
prev_log_number_ = previous_log_number;
|
|
|
|
printf(
|
|
"next_file_number %lu last_sequence "
|
|
"%lu prev_log_number %lu max_column_family %u min_log_number_to_keep "
|
|
"%" PRIu64 "\n",
|
|
(unsigned long)next_file_number_.load(), (unsigned long)last_sequence,
|
|
(unsigned long)previous_log_number,
|
|
column_family_set_->GetMaxColumnFamily(), min_log_number_to_keep_2pc());
|
|
}
|
|
|
|
return s;
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
|
|
void VersionSet::MarkFileNumberUsed(uint64_t number) {
|
|
// only called during recovery and repair which are single threaded, so this
|
|
// works because there can't be concurrent calls
|
|
if (next_file_number_.load(std::memory_order_relaxed) <= number) {
|
|
next_file_number_.store(number + 1, std::memory_order_relaxed);
|
|
}
|
|
}
|
|
|
|
// Called only either from ::LogAndApply which is protected by mutex or during
|
|
// recovery which is single-threaded.
|
|
void VersionSet::MarkMinLogNumberToKeep2PC(uint64_t number) {
|
|
if (min_log_number_to_keep_2pc_.load(std::memory_order_relaxed) < number) {
|
|
min_log_number_to_keep_2pc_.store(number, std::memory_order_relaxed);
|
|
}
|
|
}
|
|
|
|
Status VersionSet::WriteSnapshot(log::Writer* log) {
|
|
// TODO: Break up into multiple records to reduce memory usage on recovery?
|
|
|
|
// WARNING: This method doesn't hold a mutex!!
|
|
|
|
// This is done without DB mutex lock held, but only within single-threaded
|
|
// LogAndApply. Column family manipulations can only happen within LogAndApply
|
|
// (the same single thread), so we're safe to iterate.
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
assert(cfd->initialized());
|
|
{
|
|
// Store column family info
|
|
VersionEdit edit;
|
|
if (cfd->GetID() != 0) {
|
|
// default column family is always there,
|
|
// no need to explicitly write it
|
|
edit.AddColumnFamily(cfd->GetName());
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
}
|
|
edit.SetComparatorName(
|
|
cfd->internal_comparator().user_comparator()->Name());
|
|
std::string record;
|
|
if (!edit.EncodeTo(&record)) {
|
|
return Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + edit.DebugString(true));
|
|
}
|
|
Status s = log->AddRecord(record);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
{
|
|
// Save files
|
|
VersionEdit edit;
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
|
|
for (int level = 0; level < cfd->NumberLevels(); level++) {
|
|
for (const auto& f :
|
|
cfd->current()->storage_info()->LevelFiles(level)) {
|
|
edit.AddFile(level, f->fd.GetNumber(), f->fd.GetPathId(),
|
|
f->fd.GetFileSize(), f->smallest, f->largest,
|
|
f->fd.smallest_seqno, f->fd.largest_seqno,
|
|
f->marked_for_compaction);
|
|
}
|
|
}
|
|
edit.SetLogNumber(cfd->GetLogNumber());
|
|
std::string record;
|
|
if (!edit.EncodeTo(&record)) {
|
|
return Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + edit.DebugString(true));
|
|
}
|
|
Status s = log->AddRecord(record);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
// TODO(aekmekji): in CompactionJob::GenSubcompactionBoundaries(), this
|
|
// function is called repeatedly with consecutive pairs of slices. For example
|
|
// if the slice list is [a, b, c, d] this function is called with arguments
|
|
// (a,b) then (b,c) then (c,d). Knowing this, an optimization is possible where
|
|
// we avoid doing binary search for the keys b and c twice and instead somehow
|
|
// maintain state of where they first appear in the files.
|
|
uint64_t VersionSet::ApproximateSize(Version* v, const Slice& start,
|
|
const Slice& end, int start_level,
|
|
int end_level) {
|
|
// pre-condition
|
|
assert(v->cfd_->internal_comparator().Compare(start, end) <= 0);
|
|
|
|
uint64_t size = 0;
|
|
const auto* vstorage = v->storage_info();
|
|
end_level = end_level == -1
|
|
? vstorage->num_non_empty_levels()
|
|
: std::min(end_level, vstorage->num_non_empty_levels());
|
|
|
|
assert(start_level <= end_level);
|
|
|
|
for (int level = start_level; level < end_level; level++) {
|
|
const LevelFilesBrief& files_brief = vstorage->LevelFilesBrief(level);
|
|
if (!files_brief.num_files) {
|
|
// empty level, skip exploration
|
|
continue;
|
|
}
|
|
|
|
if (!level) {
|
|
// level 0 data is sorted order, handle the use case explicitly
|
|
size += ApproximateSizeLevel0(v, files_brief, start, end);
|
|
continue;
|
|
}
|
|
|
|
assert(level > 0);
|
|
assert(files_brief.num_files > 0);
|
|
|
|
// identify the file position for starting key
|
|
const uint64_t idx_start = FindFileInRange(
|
|
v->cfd_->internal_comparator(), files_brief, start,
|
|
/*start=*/0, static_cast<uint32_t>(files_brief.num_files - 1));
|
|
assert(idx_start < files_brief.num_files);
|
|
|
|
// scan all files from the starting position until the ending position
|
|
// inferred from the sorted order
|
|
for (uint64_t i = idx_start; i < files_brief.num_files; i++) {
|
|
uint64_t val;
|
|
val = ApproximateSize(v, files_brief.files[i], end);
|
|
if (!val) {
|
|
// the files after this will not have the range
|
|
break;
|
|
}
|
|
|
|
size += val;
|
|
|
|
if (i == idx_start) {
|
|
// subtract the bytes needed to be scanned to get to the starting
|
|
// key
|
|
val = ApproximateSize(v, files_brief.files[i], start);
|
|
assert(size >= val);
|
|
size -= val;
|
|
}
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
uint64_t VersionSet::ApproximateSizeLevel0(Version* v,
|
|
const LevelFilesBrief& files_brief,
|
|
const Slice& key_start,
|
|
const Slice& key_end) {
|
|
// level 0 files are not in sorted order, we need to iterate through
|
|
// the list to compute the total bytes that require scanning
|
|
uint64_t size = 0;
|
|
for (size_t i = 0; i < files_brief.num_files; i++) {
|
|
const uint64_t start = ApproximateSize(v, files_brief.files[i], key_start);
|
|
const uint64_t end = ApproximateSize(v, files_brief.files[i], key_end);
|
|
assert(end >= start);
|
|
size += end - start;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
uint64_t VersionSet::ApproximateSize(Version* v, const FdWithKeyRange& f,
|
|
const Slice& key) {
|
|
// pre-condition
|
|
assert(v);
|
|
|
|
uint64_t result = 0;
|
|
if (v->cfd_->internal_comparator().Compare(f.largest_key, key) <= 0) {
|
|
// Entire file is before "key", so just add the file size
|
|
result = f.fd.GetFileSize();
|
|
} else if (v->cfd_->internal_comparator().Compare(f.smallest_key, key) > 0) {
|
|
// Entire file is after "key", so ignore
|
|
result = 0;
|
|
} else {
|
|
// "key" falls in the range for this table. Add the
|
|
// approximate offset of "key" within the table.
|
|
TableReader* table_reader_ptr;
|
|
InternalIterator* iter = v->cfd_->table_cache()->NewIterator(
|
|
ReadOptions(), v->env_options_, v->cfd_->internal_comparator(),
|
|
*f.file_metadata, nullptr /* range_del_agg */,
|
|
v->GetMutableCFOptions().prefix_extractor.get(), &table_reader_ptr);
|
|
if (table_reader_ptr != nullptr) {
|
|
result = table_reader_ptr->ApproximateOffsetOf(key);
|
|
}
|
|
delete iter;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void VersionSet::AddLiveFiles(std::vector<FileDescriptor>* live_list) {
|
|
// pre-calculate space requirement
|
|
int64_t total_files = 0;
|
|
for (auto cfd : *column_family_set_) {
|
|
if (!cfd->initialized()) {
|
|
continue;
|
|
}
|
|
Version* dummy_versions = cfd->dummy_versions();
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions;
|
|
v = v->next_) {
|
|
const auto* vstorage = v->storage_info();
|
|
for (int level = 0; level < vstorage->num_levels(); level++) {
|
|
total_files += vstorage->LevelFiles(level).size();
|
|
}
|
|
}
|
|
}
|
|
|
|
// just one time extension to the right size
|
|
live_list->reserve(live_list->size() + static_cast<size_t>(total_files));
|
|
|
|
for (auto cfd : *column_family_set_) {
|
|
if (!cfd->initialized()) {
|
|
continue;
|
|
}
|
|
auto* current = cfd->current();
|
|
bool found_current = false;
|
|
Version* dummy_versions = cfd->dummy_versions();
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions;
|
|
v = v->next_) {
|
|
v->AddLiveFiles(live_list);
|
|
if (v == current) {
|
|
found_current = true;
|
|
}
|
|
}
|
|
if (!found_current && current != nullptr) {
|
|
// Should never happen unless it is a bug.
|
|
assert(false);
|
|
current->AddLiveFiles(live_list);
|
|
}
|
|
}
|
|
}
|
|
|
|
InternalIterator* VersionSet::MakeInputIterator(
|
|
const Compaction* c, RangeDelAggregator* range_del_agg,
|
|
const EnvOptions& env_options_compactions) {
|
|
auto cfd = c->column_family_data();
|
|
ReadOptions read_options;
|
|
read_options.verify_checksums = true;
|
|
read_options.fill_cache = false;
|
|
// Compaction iterators shouldn't be confined to a single prefix.
|
|
// Compactions use Seek() for
|
|
// (a) concurrent compactions,
|
|
// (b) CompactionFilter::Decision::kRemoveAndSkipUntil.
|
|
read_options.total_order_seek = true;
|
|
|
|
// Level-0 files have to be merged together. For other levels,
|
|
// we will make a concatenating iterator per level.
|
|
// TODO(opt): use concatenating iterator for level-0 if there is no overlap
|
|
const size_t space = (c->level() == 0 ? c->input_levels(0)->num_files +
|
|
c->num_input_levels() - 1
|
|
: c->num_input_levels());
|
|
InternalIterator** list = new InternalIterator* [space];
|
|
size_t num = 0;
|
|
for (size_t which = 0; which < c->num_input_levels(); which++) {
|
|
if (c->input_levels(which)->num_files != 0) {
|
|
if (c->level(which) == 0) {
|
|
const LevelFilesBrief* flevel = c->input_levels(which);
|
|
for (size_t i = 0; i < flevel->num_files; i++) {
|
|
list[num++] = cfd->table_cache()->NewIterator(
|
|
read_options, env_options_compactions, cfd->internal_comparator(),
|
|
*flevel->files[i].file_metadata, range_del_agg,
|
|
c->mutable_cf_options()->prefix_extractor.get(),
|
|
nullptr /* table_reader_ptr */,
|
|
nullptr /* no per level latency histogram */,
|
|
true /* for_compaction */, nullptr /* arena */,
|
|
false /* skip_filters */, static_cast<int>(which) /* level */);
|
|
}
|
|
} else {
|
|
// Create concatenating iterator for the files from this level
|
|
list[num++] = new LevelIterator(
|
|
cfd->table_cache(), read_options, env_options_compactions,
|
|
cfd->internal_comparator(), c->input_levels(which),
|
|
c->mutable_cf_options()->prefix_extractor.get(),
|
|
false /* should_sample */,
|
|
nullptr /* no per level latency histogram */,
|
|
true /* for_compaction */, false /* skip_filters */,
|
|
static_cast<int>(which) /* level */, range_del_agg,
|
|
c->boundaries(which));
|
|
}
|
|
}
|
|
}
|
|
assert(num <= space);
|
|
InternalIterator* result =
|
|
NewMergingIterator(&c->column_family_data()->internal_comparator(), list,
|
|
static_cast<int>(num));
|
|
delete[] list;
|
|
return result;
|
|
}
|
|
|
|
// verify that the files listed in this compaction are present
|
|
// in the current version
|
|
bool VersionSet::VerifyCompactionFileConsistency(Compaction* c) {
|
|
#ifndef NDEBUG
|
|
Version* version = c->column_family_data()->current();
|
|
const VersionStorageInfo* vstorage = version->storage_info();
|
|
if (c->input_version() != version) {
|
|
ROCKS_LOG_INFO(
|
|
db_options_->info_log,
|
|
"[%s] compaction output being applied to a different base version from"
|
|
" input version",
|
|
c->column_family_data()->GetName().c_str());
|
|
|
|
if (vstorage->compaction_style_ == kCompactionStyleLevel &&
|
|
c->start_level() == 0 && c->num_input_levels() > 2U) {
|
|
// We are doing a L0->base_level compaction. The assumption is if
|
|
// base level is not L1, levels from L1 to base_level - 1 is empty.
|
|
// This is ensured by having one compaction from L0 going on at the
|
|
// same time in level-based compaction. So that during the time, no
|
|
// compaction/flush can put files to those levels.
|
|
for (int l = c->start_level() + 1; l < c->output_level(); l++) {
|
|
if (vstorage->NumLevelFiles(l) != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t input = 0; input < c->num_input_levels(); ++input) {
|
|
int level = c->level(input);
|
|
for (size_t i = 0; i < c->num_input_files(input); ++i) {
|
|
uint64_t number = c->input(input, i)->fd.GetNumber();
|
|
bool found = false;
|
|
for (size_t j = 0; j < vstorage->files_[level].size(); j++) {
|
|
FileMetaData* f = vstorage->files_[level][j];
|
|
if (f->fd.GetNumber() == number) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
return false; // input files non existent in current version
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
(void)c;
|
|
#endif
|
|
return true; // everything good
|
|
}
|
|
|
|
Status VersionSet::GetMetadataForFile(uint64_t number, int* filelevel,
|
|
FileMetaData** meta,
|
|
ColumnFamilyData** cfd) {
|
|
for (auto cfd_iter : *column_family_set_) {
|
|
if (!cfd_iter->initialized()) {
|
|
continue;
|
|
}
|
|
Version* version = cfd_iter->current();
|
|
const auto* vstorage = version->storage_info();
|
|
for (int level = 0; level < vstorage->num_levels(); level++) {
|
|
for (const auto& file : vstorage->LevelFiles(level)) {
|
|
if (file->fd.GetNumber() == number) {
|
|
*meta = file;
|
|
*filelevel = level;
|
|
*cfd = cfd_iter;
|
|
return Status::OK();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return Status::NotFound("File not present in any level");
|
|
}
|
|
|
|
void VersionSet::GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped() || !cfd->initialized()) {
|
|
continue;
|
|
}
|
|
for (int level = 0; level < cfd->NumberLevels(); level++) {
|
|
for (const auto& file :
|
|
cfd->current()->storage_info()->LevelFiles(level)) {
|
|
LiveFileMetaData filemetadata;
|
|
filemetadata.column_family_name = cfd->GetName();
|
|
uint32_t path_id = file->fd.GetPathId();
|
|
if (path_id < cfd->ioptions()->cf_paths.size()) {
|
|
filemetadata.db_path = cfd->ioptions()->cf_paths[path_id].path;
|
|
} else {
|
|
assert(!cfd->ioptions()->cf_paths.empty());
|
|
filemetadata.db_path = cfd->ioptions()->cf_paths.back().path;
|
|
}
|
|
filemetadata.name = MakeTableFileName("", file->fd.GetNumber());
|
|
filemetadata.level = level;
|
|
filemetadata.size = static_cast<size_t>(file->fd.GetFileSize());
|
|
filemetadata.smallestkey = file->smallest.user_key().ToString();
|
|
filemetadata.largestkey = file->largest.user_key().ToString();
|
|
filemetadata.smallest_seqno = file->fd.smallest_seqno;
|
|
filemetadata.largest_seqno = file->fd.largest_seqno;
|
|
metadata->push_back(filemetadata);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionSet::GetObsoleteFiles(std::vector<ObsoleteFileInfo>* files,
|
|
std::vector<std::string>* manifest_filenames,
|
|
uint64_t min_pending_output) {
|
|
assert(manifest_filenames->empty());
|
|
obsolete_manifests_.swap(*manifest_filenames);
|
|
std::vector<ObsoleteFileInfo> pending_files;
|
|
for (auto& f : obsolete_files_) {
|
|
if (f.metadata->fd.GetNumber() < min_pending_output) {
|
|
files->push_back(std::move(f));
|
|
} else {
|
|
pending_files.push_back(std::move(f));
|
|
}
|
|
}
|
|
obsolete_files_.swap(pending_files);
|
|
}
|
|
|
|
ColumnFamilyData* VersionSet::CreateColumnFamily(
|
|
const ColumnFamilyOptions& cf_options, VersionEdit* edit) {
|
|
assert(edit->is_column_family_add_);
|
|
|
|
MutableCFOptions dummy_cf_options;
|
|
Version* dummy_versions =
|
|
new Version(nullptr, this, env_options_, dummy_cf_options);
|
|
// Ref() dummy version once so that later we can call Unref() to delete it
|
|
// by avoiding calling "delete" explicitly (~Version is private)
|
|
dummy_versions->Ref();
|
|
auto new_cfd = column_family_set_->CreateColumnFamily(
|
|
edit->column_family_name_, edit->column_family_, dummy_versions,
|
|
cf_options);
|
|
|
|
Version* v = new Version(new_cfd, this, env_options_,
|
|
*new_cfd->GetLatestMutableCFOptions(),
|
|
current_version_number_++);
|
|
|
|
// Fill level target base information.
|
|
v->storage_info()->CalculateBaseBytes(*new_cfd->ioptions(),
|
|
*new_cfd->GetLatestMutableCFOptions());
|
|
AppendVersion(new_cfd, v);
|
|
// GetLatestMutableCFOptions() is safe here without mutex since the
|
|
// cfd is not available to client
|
|
new_cfd->CreateNewMemtable(*new_cfd->GetLatestMutableCFOptions(),
|
|
LastSequence());
|
|
new_cfd->SetLogNumber(edit->log_number_);
|
|
return new_cfd;
|
|
}
|
|
|
|
uint64_t VersionSet::GetNumLiveVersions(Version* dummy_versions) {
|
|
uint64_t count = 0;
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions; v = v->next_) {
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
uint64_t VersionSet::GetTotalSstFilesSize(Version* dummy_versions) {
|
|
std::unordered_set<uint64_t> unique_files;
|
|
uint64_t total_files_size = 0;
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions; v = v->next_) {
|
|
VersionStorageInfo* storage_info = v->storage_info();
|
|
for (int level = 0; level < storage_info->num_levels_; level++) {
|
|
for (const auto& file_meta : storage_info->LevelFiles(level)) {
|
|
if (unique_files.find(file_meta->fd.packed_number_and_path_id) ==
|
|
unique_files.end()) {
|
|
unique_files.insert(file_meta->fd.packed_number_and_path_id);
|
|
total_files_size += file_meta->fd.GetFileSize();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return total_files_size;
|
|
}
|
|
|
|
} // namespace rocksdb
|
|
|