fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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483 lines
16 KiB
483 lines
16 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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#include "db/memtable_list.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 <string>
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#include "db/memtable.h"
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#include "db/version_set.h"
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#include "monitoring/thread_status_util.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/iterator.h"
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#include "table/merging_iterator.h"
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#include "util/coding.h"
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#include "util/log_buffer.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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class InternalKeyComparator;
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class Mutex;
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class VersionSet;
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void MemTableListVersion::AddMemTable(MemTable* m) {
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memlist_.push_front(m);
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*parent_memtable_list_memory_usage_ += m->ApproximateMemoryUsage();
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}
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void MemTableListVersion::UnrefMemTable(autovector<MemTable*>* to_delete,
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MemTable* m) {
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if (m->Unref()) {
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to_delete->push_back(m);
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assert(*parent_memtable_list_memory_usage_ >= m->ApproximateMemoryUsage());
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*parent_memtable_list_memory_usage_ -= m->ApproximateMemoryUsage();
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} else {
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}
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}
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MemTableListVersion::MemTableListVersion(
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size_t* parent_memtable_list_memory_usage, MemTableListVersion* old)
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: max_write_buffer_number_to_maintain_(
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old->max_write_buffer_number_to_maintain_),
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parent_memtable_list_memory_usage_(parent_memtable_list_memory_usage) {
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if (old != nullptr) {
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memlist_ = old->memlist_;
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for (auto& m : memlist_) {
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m->Ref();
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}
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memlist_history_ = old->memlist_history_;
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for (auto& m : memlist_history_) {
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m->Ref();
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}
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}
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}
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MemTableListVersion::MemTableListVersion(
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size_t* parent_memtable_list_memory_usage,
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int max_write_buffer_number_to_maintain)
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: max_write_buffer_number_to_maintain_(max_write_buffer_number_to_maintain),
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parent_memtable_list_memory_usage_(parent_memtable_list_memory_usage) {}
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void MemTableListVersion::Ref() { ++refs_; }
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// called by superversion::clean()
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void MemTableListVersion::Unref(autovector<MemTable*>* to_delete) {
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assert(refs_ >= 1);
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--refs_;
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if (refs_ == 0) {
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// if to_delete is equal to nullptr it means we're confident
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// that refs_ will not be zero
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assert(to_delete != nullptr);
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for (const auto& m : memlist_) {
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UnrefMemTable(to_delete, m);
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}
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for (const auto& m : memlist_history_) {
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UnrefMemTable(to_delete, m);
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}
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delete this;
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}
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}
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int MemTableList::NumNotFlushed() const {
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int size = static_cast<int>(current_->memlist_.size());
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assert(num_flush_not_started_ <= size);
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return size;
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}
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int MemTableList::NumFlushed() const {
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return static_cast<int>(current_->memlist_history_.size());
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}
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// Search all the memtables starting from the most recent one.
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// Return the most recent value found, if any.
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// Operands stores the list of merge operations to apply, so far.
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bool MemTableListVersion::Get(const LookupKey& key, std::string* value,
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Status* s, MergeContext* merge_context,
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RangeDelAggregator* range_del_agg,
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SequenceNumber* seq, const ReadOptions& read_opts,
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ReadCallback* callback, bool* is_blob_index) {
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return GetFromList(&memlist_, key, value, s, merge_context, range_del_agg,
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seq, read_opts, callback, is_blob_index);
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}
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bool MemTableListVersion::GetFromHistory(
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const LookupKey& key, std::string* value, Status* s,
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MergeContext* merge_context, RangeDelAggregator* range_del_agg,
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SequenceNumber* seq, const ReadOptions& read_opts, bool* is_blob_index) {
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return GetFromList(&memlist_history_, key, value, s, merge_context,
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range_del_agg, seq, read_opts, nullptr /*read_callback*/,
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is_blob_index);
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}
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bool MemTableListVersion::GetFromList(
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std::list<MemTable*>* list, const LookupKey& key, std::string* value,
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Status* s, MergeContext* merge_context, RangeDelAggregator* range_del_agg,
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SequenceNumber* seq, const ReadOptions& read_opts, ReadCallback* callback,
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bool* is_blob_index) {
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*seq = kMaxSequenceNumber;
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for (auto& memtable : *list) {
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SequenceNumber current_seq = kMaxSequenceNumber;
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bool done = memtable->Get(key, value, s, merge_context, range_del_agg,
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¤t_seq, read_opts, callback, is_blob_index);
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if (*seq == kMaxSequenceNumber) {
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// Store the most recent sequence number of any operation on this key.
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// Since we only care about the most recent change, we only need to
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// return the first operation found when searching memtables in
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// reverse-chronological order.
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// current_seq would be equal to kMaxSequenceNumber if the value was to be
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// skipped. This allows seq to be assigned again when the next value is
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// read.
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*seq = current_seq;
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}
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if (done) {
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assert(*seq != kMaxSequenceNumber);
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return true;
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}
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if (!done && !s->ok() && !s->IsMergeInProgress() && !s->IsNotFound()) {
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return false;
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}
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}
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return false;
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}
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Status MemTableListVersion::AddRangeTombstoneIterators(
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const ReadOptions& read_opts, Arena* arena,
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RangeDelAggregator* range_del_agg) {
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assert(range_del_agg != nullptr);
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for (auto& m : memlist_) {
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std::unique_ptr<InternalIterator> range_del_iter(
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m->NewRangeTombstoneIterator(read_opts));
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Status s = range_del_agg->AddTombstones(std::move(range_del_iter));
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if (!s.ok()) {
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return s;
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}
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}
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return Status::OK();
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}
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Status MemTableListVersion::AddRangeTombstoneIterators(
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const ReadOptions& read_opts,
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std::vector<InternalIterator*>* range_del_iters) {
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for (auto& m : memlist_) {
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auto* range_del_iter = m->NewRangeTombstoneIterator(read_opts);
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if (range_del_iter != nullptr) {
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range_del_iters->push_back(range_del_iter);
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}
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}
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return Status::OK();
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}
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void MemTableListVersion::AddIterators(
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const ReadOptions& options, std::vector<InternalIterator*>* iterator_list,
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Arena* arena) {
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for (auto& m : memlist_) {
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iterator_list->push_back(m->NewIterator(options, arena));
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}
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}
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void MemTableListVersion::AddIterators(
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const ReadOptions& options, MergeIteratorBuilder* merge_iter_builder) {
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for (auto& m : memlist_) {
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merge_iter_builder->AddIterator(
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m->NewIterator(options, merge_iter_builder->GetArena()));
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}
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}
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uint64_t MemTableListVersion::GetTotalNumEntries() const {
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uint64_t total_num = 0;
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for (auto& m : memlist_) {
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total_num += m->num_entries();
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}
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return total_num;
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}
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MemTable::MemTableStats MemTableListVersion::ApproximateStats(
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const Slice& start_ikey, const Slice& end_ikey) {
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MemTable::MemTableStats total_stats = {0, 0};
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for (auto& m : memlist_) {
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auto mStats = m->ApproximateStats(start_ikey, end_ikey);
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total_stats.size += mStats.size;
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total_stats.count += mStats.count;
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}
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return total_stats;
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}
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uint64_t MemTableListVersion::GetTotalNumDeletes() const {
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uint64_t total_num = 0;
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for (auto& m : memlist_) {
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total_num += m->num_deletes();
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}
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return total_num;
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}
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SequenceNumber MemTableListVersion::GetEarliestSequenceNumber(
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bool include_history) const {
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if (include_history && !memlist_history_.empty()) {
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return memlist_history_.back()->GetEarliestSequenceNumber();
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} else if (!memlist_.empty()) {
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return memlist_.back()->GetEarliestSequenceNumber();
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} else {
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return kMaxSequenceNumber;
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}
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}
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// caller is responsible for referencing m
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void MemTableListVersion::Add(MemTable* m, autovector<MemTable*>* to_delete) {
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assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
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AddMemTable(m);
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TrimHistory(to_delete);
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}
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// Removes m from list of memtables not flushed. Caller should NOT Unref m.
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void MemTableListVersion::Remove(MemTable* m,
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autovector<MemTable*>* to_delete) {
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assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
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memlist_.remove(m);
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if (max_write_buffer_number_to_maintain_ > 0) {
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memlist_history_.push_front(m);
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TrimHistory(to_delete);
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} else {
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UnrefMemTable(to_delete, m);
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}
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}
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// Make sure we don't use up too much space in history
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void MemTableListVersion::TrimHistory(autovector<MemTable*>* to_delete) {
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while (memlist_.size() + memlist_history_.size() >
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static_cast<size_t>(max_write_buffer_number_to_maintain_) &&
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!memlist_history_.empty()) {
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MemTable* x = memlist_history_.back();
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memlist_history_.pop_back();
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UnrefMemTable(to_delete, x);
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}
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}
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// Returns true if there is at least one memtable on which flush has
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// not yet started.
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bool MemTableList::IsFlushPending() const {
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if ((flush_requested_ && num_flush_not_started_ >= 1) ||
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(num_flush_not_started_ >= min_write_buffer_number_to_merge_)) {
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assert(imm_flush_needed.load(std::memory_order_relaxed));
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return true;
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}
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return false;
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}
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// Returns the memtables that need to be flushed.
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void MemTableList::PickMemtablesToFlush(autovector<MemTable*>* ret) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_PICK_MEMTABLES_TO_FLUSH);
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const auto& memlist = current_->memlist_;
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for (auto it = memlist.rbegin(); it != memlist.rend(); ++it) {
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MemTable* m = *it;
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if (!m->flush_in_progress_) {
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assert(!m->flush_completed_);
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num_flush_not_started_--;
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if (num_flush_not_started_ == 0) {
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imm_flush_needed.store(false, std::memory_order_release);
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}
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m->flush_in_progress_ = true; // flushing will start very soon
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ret->push_back(m);
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}
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}
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flush_requested_ = false; // start-flush request is complete
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}
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void MemTableList::RollbackMemtableFlush(const autovector<MemTable*>& mems,
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uint64_t file_number) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_MEMTABLE_ROLLBACK);
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assert(!mems.empty());
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// If the flush was not successful, then just reset state.
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// Maybe a succeeding attempt to flush will be successful.
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for (MemTable* m : mems) {
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assert(m->flush_in_progress_);
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assert(m->file_number_ == 0);
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m->flush_in_progress_ = false;
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m->flush_completed_ = false;
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m->edit_.Clear();
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num_flush_not_started_++;
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}
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imm_flush_needed.store(true, std::memory_order_release);
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}
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// Record a successful flush in the manifest file
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Status MemTableList::InstallMemtableFlushResults(
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ColumnFamilyData* cfd, const MutableCFOptions& mutable_cf_options,
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const autovector<MemTable*>& mems, VersionSet* vset, InstrumentedMutex* mu,
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uint64_t file_number, autovector<MemTable*>* to_delete,
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Directory* db_directory, LogBuffer* log_buffer) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_MEMTABLE_INSTALL_FLUSH_RESULTS);
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mu->AssertHeld();
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// flush was successful
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for (size_t i = 0; i < mems.size(); ++i) {
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// All the edits are associated with the first memtable of this batch.
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assert(i == 0 || mems[i]->GetEdits()->NumEntries() == 0);
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mems[i]->flush_completed_ = true;
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mems[i]->file_number_ = file_number;
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}
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// if some other thread is already committing, then return
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Status s;
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if (commit_in_progress_) {
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TEST_SYNC_POINT("MemTableList::InstallMemtableFlushResults:InProgress");
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return s;
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}
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// Only a single thread can be executing this piece of code
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commit_in_progress_ = true;
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// Retry until all completed flushes are committed. New flushes can finish
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// while the current thread is writing manifest where mutex is released.
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while (s.ok()) {
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auto& memlist = current_->memlist_;
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if (memlist.empty() || !memlist.back()->flush_completed_) {
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break;
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}
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// scan all memtables from the earliest, and commit those
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// (in that order) that have finished flushing. Memetables
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// are always committed in the order that they were created.
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uint64_t batch_file_number = 0;
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size_t batch_count = 0;
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autovector<VersionEdit*> edit_list;
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// enumerate from the last (earliest) element to see how many batch finished
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for (auto it = memlist.rbegin(); it != memlist.rend(); ++it) {
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MemTable* m = *it;
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if (!m->flush_completed_) {
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break;
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}
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if (it == memlist.rbegin() || batch_file_number != m->file_number_) {
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batch_file_number = m->file_number_;
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ROCKS_LOG_BUFFER(log_buffer,
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"[%s] Level-0 commit table #%" PRIu64 " started",
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cfd->GetName().c_str(), m->file_number_);
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edit_list.push_back(&m->edit_);
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}
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batch_count++;
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}
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if (batch_count > 0) {
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// this can release and reacquire the mutex.
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s = vset->LogAndApply(cfd, mutable_cf_options, edit_list, mu,
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db_directory);
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// we will be changing the version in the next code path,
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// so we better create a new one, since versions are immutable
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InstallNewVersion();
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// All the later memtables that have the same filenum
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// are part of the same batch. They can be committed now.
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uint64_t mem_id = 1; // how many memtables have been flushed.
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if (s.ok()) { // commit new state
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while (batch_count-- > 0) {
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MemTable* m = current_->memlist_.back();
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ROCKS_LOG_BUFFER(log_buffer, "[%s] Level-0 commit table #%" PRIu64
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": memtable #%" PRIu64 " done",
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cfd->GetName().c_str(), m->file_number_, mem_id);
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assert(m->file_number_ > 0);
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current_->Remove(m, to_delete);
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++mem_id;
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}
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} else {
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for (auto it = current_->memlist_.rbegin(); batch_count-- > 0; it++) {
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MemTable* m = *it;
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// commit failed. setup state so that we can flush again.
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ROCKS_LOG_BUFFER(log_buffer, "Level-0 commit table #%" PRIu64
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": memtable #%" PRIu64 " failed",
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m->file_number_, mem_id);
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m->flush_completed_ = false;
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m->flush_in_progress_ = false;
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m->edit_.Clear();
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num_flush_not_started_++;
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m->file_number_ = 0;
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imm_flush_needed.store(true, std::memory_order_release);
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++mem_id;
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}
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}
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}
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}
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commit_in_progress_ = false;
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return s;
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}
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// New memtables are inserted at the front of the list.
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void MemTableList::Add(MemTable* m, autovector<MemTable*>* to_delete) {
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assert(static_cast<int>(current_->memlist_.size()) >= num_flush_not_started_);
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InstallNewVersion();
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// this method is used to move mutable memtable into an immutable list.
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// since mutable memtable is already refcounted by the DBImpl,
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// and when moving to the imutable list we don't unref it,
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// we don't have to ref the memtable here. we just take over the
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// reference from the DBImpl.
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current_->Add(m, to_delete);
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m->MarkImmutable();
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num_flush_not_started_++;
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if (num_flush_not_started_ == 1) {
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imm_flush_needed.store(true, std::memory_order_release);
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}
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}
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// Returns an estimate of the number of bytes of data in use.
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size_t MemTableList::ApproximateUnflushedMemTablesMemoryUsage() {
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size_t total_size = 0;
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for (auto& memtable : current_->memlist_) {
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total_size += memtable->ApproximateMemoryUsage();
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}
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return total_size;
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}
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size_t MemTableList::ApproximateMemoryUsage() { return current_memory_usage_; }
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void MemTableList::InstallNewVersion() {
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if (current_->refs_ == 1) {
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// we're the only one using the version, just keep using it
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} else {
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// somebody else holds the current version, we need to create new one
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MemTableListVersion* version = current_;
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current_ = new MemTableListVersion(¤t_memory_usage_, current_);
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current_->Ref();
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version->Unref();
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}
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}
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uint64_t MemTableList::GetMinLogContainingPrepSection() {
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uint64_t min_log = 0;
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for (auto& m : current_->memlist_) {
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// this mem has been flushed it no longer
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// needs to hold on the its prep section
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if (m->flush_completed_) {
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continue;
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}
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auto log = m->GetMinLogContainingPrepSection();
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if (log > 0 && (min_log == 0 || log < min_log)) {
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min_log = log;
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}
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}
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return min_log;
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}
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} // namespace rocksdb
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