Summary: Move all the logic of VersionBuilder to a separate .cc file Test Plan: make all check Reviewers: ljin, yhchiang, rven, igor Reviewed By: igor Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D28083main
sdong
10 years ago
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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_builder.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 <algorithm> |
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#include <set> |
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#include <vector> |
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#include "db/dbformat.h" |
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#include "db/table_cache.h" |
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#include "db/version_set.h" |
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#include "table/table_reader.h" |
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namespace rocksdb { |
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bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b) { |
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if (a->smallest_seqno != b->smallest_seqno) { |
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return a->smallest_seqno > b->smallest_seqno; |
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} |
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if (a->largest_seqno != b->largest_seqno) { |
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return a->largest_seqno > b->largest_seqno; |
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} |
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// Break ties by file number
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return a->fd.GetNumber() > b->fd.GetNumber(); |
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} |
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namespace { |
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bool BySmallestKey(FileMetaData* a, FileMetaData* b, |
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const InternalKeyComparator* cmp) { |
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int r = cmp->Compare(a->smallest, b->smallest); |
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if (r != 0) { |
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return (r < 0); |
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} |
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// Break ties by file number
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return (a->fd.GetNumber() < b->fd.GetNumber()); |
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} |
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} // namespace
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class VersionBuilder::Rep { |
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private: |
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// Helper to sort files_ in v
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// kLevel0 -- NewestFirstBySeqNo
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// kLevelNon0 -- BySmallestKey
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struct FileComparator { |
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enum SortMethod { |
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kLevel0 = 0, |
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kLevelNon0 = 1, |
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} sort_method; |
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const InternalKeyComparator* internal_comparator; |
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bool operator()(FileMetaData* f1, FileMetaData* f2) const { |
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switch (sort_method) { |
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case kLevel0: |
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return NewestFirstBySeqNo(f1, f2); |
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case kLevelNon0: |
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return BySmallestKey(f1, f2, internal_comparator); |
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} |
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assert(false); |
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return false; |
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} |
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}; |
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typedef std::set<FileMetaData*, FileComparator> FileSet; |
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struct LevelState { |
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std::set<uint64_t> deleted_files; |
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FileSet* added_files; |
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}; |
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const EnvOptions& env_options_; |
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TableCache* table_cache_; |
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VersionStorageInfo* base_vstorage_; |
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LevelState* levels_; |
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FileComparator level_zero_cmp_; |
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FileComparator level_nonzero_cmp_; |
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public: |
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Rep(const EnvOptions& env_options, TableCache* table_cache, |
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VersionStorageInfo* base_vstorage) |
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: env_options_(env_options), |
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table_cache_(table_cache), |
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base_vstorage_(base_vstorage) { |
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levels_ = new LevelState[base_vstorage_->NumberLevels()]; |
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level_zero_cmp_.sort_method = FileComparator::kLevel0; |
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level_nonzero_cmp_.sort_method = FileComparator::kLevelNon0; |
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level_nonzero_cmp_.internal_comparator = |
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base_vstorage_->InternalComparator(); |
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levels_[0].added_files = new FileSet(level_zero_cmp_); |
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for (int level = 1; level < base_vstorage_->NumberLevels(); level++) { |
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levels_[level].added_files = new FileSet(level_nonzero_cmp_); |
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} |
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} |
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~Rep() { |
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for (int level = 0; level < base_vstorage_->NumberLevels(); level++) { |
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const FileSet* added = levels_[level].added_files; |
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std::vector<FileMetaData*> to_unref; |
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to_unref.reserve(added->size()); |
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for (FileSet::const_iterator it = added->begin(); |
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it != added->end(); ++it) { |
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to_unref.push_back(*it); |
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} |
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delete added; |
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for (uint32_t i = 0; i < to_unref.size(); i++) { |
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FileMetaData* f = to_unref[i]; |
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f->refs--; |
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if (f->refs <= 0) { |
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if (f->table_reader_handle) { |
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assert(table_cache_ != nullptr); |
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table_cache_->ReleaseHandle(f->table_reader_handle); |
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f->table_reader_handle = nullptr; |
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} |
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delete f; |
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} |
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} |
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} |
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delete[] levels_; |
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} |
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void CheckConsistency(VersionStorageInfo* vstorage) { |
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#ifndef NDEBUG |
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// make sure the files are sorted correctly
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for (int level = 0; level < vstorage->NumberLevels(); level++) { |
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auto& level_files = vstorage->LevelFiles(level); |
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for (size_t i = 1; i < level_files.size(); i++) { |
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auto f1 = level_files[i - 1]; |
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auto f2 = level_files[i]; |
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if (level == 0) { |
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assert(level_zero_cmp_(f1, f2)); |
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assert(f1->largest_seqno > f2->largest_seqno); |
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} else { |
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assert(level_nonzero_cmp_(f1, f2)); |
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// Make sure there is no overlap in levels > 0
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if (vstorage->InternalComparator()->Compare(f1->largest, |
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f2->smallest) >= 0) { |
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fprintf(stderr, "overlapping ranges in same level %s vs. %s\n", |
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(f1->largest).DebugString().c_str(), |
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(f2->smallest).DebugString().c_str()); |
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abort(); |
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} |
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} |
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} |
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} |
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#endif |
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} |
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void CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number, |
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int level) { |
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#ifndef NDEBUG |
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// a file to be deleted better exist in the previous version
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bool found = false; |
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for (int l = 0; !found && l < base_vstorage_->NumberLevels(); l++) { |
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const std::vector<FileMetaData*>& base_files = |
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base_vstorage_->LevelFiles(l); |
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for (unsigned int i = 0; i < base_files.size(); i++) { |
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FileMetaData* f = base_files[i]; |
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if (f->fd.GetNumber() == number) { |
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found = true; |
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break; |
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} |
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} |
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} |
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// if the file did not exist in the previous version, then it
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// is possibly moved from lower level to higher level in current
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// version
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for (int l = level + 1; !found && l < base_vstorage_->NumberLevels(); |
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l++) { |
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const FileSet* added = levels_[l].added_files; |
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for (FileSet::const_iterator added_iter = added->begin(); |
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added_iter != added->end(); ++added_iter) { |
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FileMetaData* f = *added_iter; |
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if (f->fd.GetNumber() == number) { |
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found = true; |
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break; |
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} |
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} |
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} |
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// maybe this file was added in a previous edit that was Applied
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if (!found) { |
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const FileSet* added = levels_[level].added_files; |
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for (FileSet::const_iterator added_iter = added->begin(); |
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added_iter != added->end(); ++added_iter) { |
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FileMetaData* f = *added_iter; |
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if (f->fd.GetNumber() == number) { |
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found = true; |
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break; |
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} |
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} |
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} |
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if (!found) { |
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fprintf(stderr, "not found %" PRIu64 "\n", number); |
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} |
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assert(found); |
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#endif |
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} |
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// Apply all of the edits in *edit to the current state.
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void Apply(VersionEdit* edit) { |
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CheckConsistency(base_vstorage_); |
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// Delete files
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const VersionEdit::DeletedFileSet& del = edit->GetDeletedFiles(); |
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for (const auto& del_file : del) { |
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const auto level = del_file.first; |
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const auto number = del_file.second; |
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levels_[level].deleted_files.insert(number); |
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CheckConsistencyForDeletes(edit, number, level); |
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} |
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// Add new files
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for (const auto& new_file : edit->GetNewFiles()) { |
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const int level = new_file.first; |
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FileMetaData* f = new FileMetaData(new_file.second); |
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f->refs = 1; |
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levels_[level].deleted_files.erase(f->fd.GetNumber()); |
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levels_[level].added_files->insert(f); |
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} |
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} |
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// Save the current state in *v.
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void SaveTo(VersionStorageInfo* vstorage) { |
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CheckConsistency(base_vstorage_); |
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CheckConsistency(vstorage); |
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for (int level = 0; level < base_vstorage_->NumberLevels(); level++) { |
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const auto& cmp = (level == 0) ? level_zero_cmp_ : level_nonzero_cmp_; |
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// Merge the set of added files with the set of pre-existing files.
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// Drop any deleted files. Store the result in *v.
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const auto& base_files = base_vstorage_->LevelFiles(level); |
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auto base_iter = base_files.begin(); |
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auto base_end = base_files.end(); |
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const auto& added_files = *levels_[level].added_files; |
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vstorage->Reserve(level, base_files.size() + added_files.size()); |
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for (const auto& added : added_files) { |
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// Add all smaller files listed in base_
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for (auto bpos = std::upper_bound(base_iter, base_end, added, cmp); |
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base_iter != bpos; |
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++base_iter) { |
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MaybeAddFile(vstorage, level, *base_iter); |
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} |
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MaybeAddFile(vstorage, level, added); |
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} |
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// Add remaining base files
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for (; base_iter != base_end; ++base_iter) { |
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MaybeAddFile(vstorage, level, *base_iter); |
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} |
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} |
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CheckConsistency(vstorage); |
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} |
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void LoadTableHandlers() { |
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assert(table_cache_ != nullptr); |
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for (int level = 0; level < base_vstorage_->NumberLevels(); level++) { |
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for (auto& file_meta : *(levels_[level].added_files)) { |
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assert(!file_meta->table_reader_handle); |
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table_cache_->FindTable( |
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env_options_, *(base_vstorage_->InternalComparator()), |
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file_meta->fd, &file_meta->table_reader_handle, false); |
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if (file_meta->table_reader_handle != nullptr) { |
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// Load table_reader
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file_meta->fd.table_reader = table_cache_->GetTableReaderFromHandle( |
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file_meta->table_reader_handle); |
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} |
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} |
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} |
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} |
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void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f) { |
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if (levels_[level].deleted_files.count(f->fd.GetNumber()) > 0) { |
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// File is deleted: do nothing
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} else { |
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vstorage->MaybeAddFile(level, f); |
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} |
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} |
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}; |
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VersionBuilder::VersionBuilder(const EnvOptions& env_options, |
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TableCache* table_cache, |
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VersionStorageInfo* base_vstorage) |
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: rep_(new Rep(env_options, table_cache, base_vstorage)) {} |
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VersionBuilder::~VersionBuilder() { delete rep_; } |
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void VersionBuilder::CheckConsistency(VersionStorageInfo* vstorage) { |
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rep_->CheckConsistency(vstorage); |
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} |
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void VersionBuilder::CheckConsistencyForDeletes(VersionEdit* edit, |
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uint64_t number, int level) { |
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rep_->CheckConsistencyForDeletes(edit, number, level); |
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} |
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void VersionBuilder::Apply(VersionEdit* edit) { rep_->Apply(edit); } |
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void VersionBuilder::SaveTo(VersionStorageInfo* vstorage) { |
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rep_->SaveTo(vstorage); |
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} |
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void VersionBuilder::LoadTableHandlers() { rep_->LoadTableHandlers(); } |
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void VersionBuilder::MaybeAddFile(VersionStorageInfo* vstorage, int level, |
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FileMetaData* f) { |
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rep_->MaybeAddFile(vstorage, level, f); |
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} |
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} // namespace rocksdb
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