move LevelCompactionPicker to a separate file (#5369)
Summary: In order to improve code readability, this PR moves LevelCompactionBuilder and LevelCompactionPicker to compaction_picker_level.h and .cc Pull Request resolved: https://github.com/facebook/rocksdb/pull/5369 Differential Revision: D15540172 Pulled By: miasantreble fbshipit-source-id: c1a578b93f127cd63661b53f32b356e6edd349afmain
Zhongyi Xie
6 years ago
committed by
Facebook Github Bot
parent
ff9d286877
commit
ab8f6c01a6
@ -0,0 +1,558 @@ |
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// 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/compaction_picker_level.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 <string> |
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#include <utility> |
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#include <vector> |
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#include "test_util/sync_point.h" |
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#include "util/log_buffer.h" |
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namespace rocksdb { |
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bool LevelCompactionPicker::NeedsCompaction( |
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const VersionStorageInfo* vstorage) const { |
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if (!vstorage->ExpiredTtlFiles().empty()) { |
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return true; |
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} |
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if (!vstorage->FilesMarkedForPeriodicCompaction().empty()) { |
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return true; |
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} |
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if (!vstorage->BottommostFilesMarkedForCompaction().empty()) { |
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return true; |
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} |
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if (!vstorage->FilesMarkedForCompaction().empty()) { |
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return true; |
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} |
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for (int i = 0; i <= vstorage->MaxInputLevel(); i++) { |
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if (vstorage->CompactionScore(i) >= 1) { |
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return true; |
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} |
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} |
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return false; |
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} |
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namespace { |
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// A class to build a leveled compaction step-by-step.
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class LevelCompactionBuilder { |
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public: |
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LevelCompactionBuilder(const std::string& cf_name, |
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VersionStorageInfo* vstorage, |
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CompactionPicker* compaction_picker, |
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LogBuffer* log_buffer, |
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const MutableCFOptions& mutable_cf_options, |
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const ImmutableCFOptions& ioptions) |
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: cf_name_(cf_name), |
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vstorage_(vstorage), |
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compaction_picker_(compaction_picker), |
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log_buffer_(log_buffer), |
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mutable_cf_options_(mutable_cf_options), |
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ioptions_(ioptions) {} |
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// Pick and return a compaction.
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Compaction* PickCompaction(); |
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// Pick the initial files to compact to the next level. (or together
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// in Intra-L0 compactions)
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void SetupInitialFiles(); |
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// If the initial files are from L0 level, pick other L0
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// files if needed.
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bool SetupOtherL0FilesIfNeeded(); |
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// Based on initial files, setup other files need to be compacted
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// in this compaction, accordingly.
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bool SetupOtherInputsIfNeeded(); |
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Compaction* GetCompaction(); |
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// For the specfied level, pick a file that we want to compact.
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// Returns false if there is no file to compact.
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// If it returns true, inputs->files.size() will be exactly one.
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// If level is 0 and there is already a compaction on that level, this
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// function will return false.
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bool PickFileToCompact(); |
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// For L0->L0, picks the longest span of files that aren't currently
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// undergoing compaction for which work-per-deleted-file decreases. The span
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// always starts from the newest L0 file.
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//
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// Intra-L0 compaction is independent of all other files, so it can be
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// performed even when L0->base_level compactions are blocked.
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//
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// Returns true if `inputs` is populated with a span of files to be compacted;
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// otherwise, returns false.
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bool PickIntraL0Compaction(); |
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void PickExpiredTtlFiles(); |
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void PickFilesMarkedForPeriodicCompaction(); |
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const std::string& cf_name_; |
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VersionStorageInfo* vstorage_; |
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CompactionPicker* compaction_picker_; |
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LogBuffer* log_buffer_; |
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int start_level_ = -1; |
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int output_level_ = -1; |
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int parent_index_ = -1; |
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int base_index_ = -1; |
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double start_level_score_ = 0; |
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bool is_manual_ = false; |
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CompactionInputFiles start_level_inputs_; |
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std::vector<CompactionInputFiles> compaction_inputs_; |
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CompactionInputFiles output_level_inputs_; |
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std::vector<FileMetaData*> grandparents_; |
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CompactionReason compaction_reason_ = CompactionReason::kUnknown; |
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const MutableCFOptions& mutable_cf_options_; |
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const ImmutableCFOptions& ioptions_; |
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// Pick a path ID to place a newly generated file, with its level
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static uint32_t GetPathId(const ImmutableCFOptions& ioptions, |
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const MutableCFOptions& mutable_cf_options, |
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int level); |
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static const int kMinFilesForIntraL0Compaction = 4; |
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}; |
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void LevelCompactionBuilder::PickExpiredTtlFiles() { |
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if (vstorage_->ExpiredTtlFiles().empty()) { |
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return; |
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} |
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auto continuation = [&](std::pair<int, FileMetaData*> level_file) { |
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// If it's being compacted it has nothing to do here.
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// If this assert() fails that means that some function marked some
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// files as being_compacted, but didn't call ComputeCompactionScore()
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assert(!level_file.second->being_compacted); |
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start_level_ = level_file.first; |
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output_level_ = |
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(start_level_ == 0) ? vstorage_->base_level() : start_level_ + 1; |
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if ((start_level_ == vstorage_->num_non_empty_levels() - 1) || |
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(start_level_ == 0 && |
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!compaction_picker_->level0_compactions_in_progress()->empty())) { |
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return false; |
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} |
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start_level_inputs_.files = {level_file.second}; |
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start_level_inputs_.level = start_level_; |
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return compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_, |
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&start_level_inputs_); |
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}; |
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for (auto& level_file : vstorage_->ExpiredTtlFiles()) { |
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if (continuation(level_file)) { |
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// found the compaction!
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return; |
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} |
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} |
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start_level_inputs_.files.clear(); |
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} |
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void LevelCompactionBuilder::PickFilesMarkedForPeriodicCompaction() { |
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if (vstorage_->FilesMarkedForPeriodicCompaction().empty()) { |
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return; |
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} |
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auto continuation = [&](std::pair<int, FileMetaData*> level_file) { |
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// If it's being compacted it has nothing to do here.
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// If this assert() fails that means that some function marked some
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// files as being_compacted, but didn't call ComputeCompactionScore()
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assert(!level_file.second->being_compacted); |
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output_level_ = start_level_ = level_file.first; |
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if (start_level_ == 0 && |
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!compaction_picker_->level0_compactions_in_progress()->empty()) { |
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return false; |
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} |
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start_level_inputs_.files = {level_file.second}; |
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start_level_inputs_.level = start_level_; |
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return compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_, |
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&start_level_inputs_); |
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}; |
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for (auto& level_file : vstorage_->FilesMarkedForPeriodicCompaction()) { |
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if (continuation(level_file)) { |
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// found the compaction!
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return; |
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} |
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} |
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start_level_inputs_.files.clear(); |
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} |
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void LevelCompactionBuilder::SetupInitialFiles() { |
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// Find the compactions by size on all levels.
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bool skipped_l0_to_base = false; |
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for (int i = 0; i < compaction_picker_->NumberLevels() - 1; i++) { |
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start_level_score_ = vstorage_->CompactionScore(i); |
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start_level_ = vstorage_->CompactionScoreLevel(i); |
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assert(i == 0 || start_level_score_ <= vstorage_->CompactionScore(i - 1)); |
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if (start_level_score_ >= 1) { |
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if (skipped_l0_to_base && start_level_ == vstorage_->base_level()) { |
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// If L0->base_level compaction is pending, don't schedule further
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// compaction from base level. Otherwise L0->base_level compaction
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// may starve.
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continue; |
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} |
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output_level_ = |
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(start_level_ == 0) ? vstorage_->base_level() : start_level_ + 1; |
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if (PickFileToCompact()) { |
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// found the compaction!
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if (start_level_ == 0) { |
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// L0 score = `num L0 files` / `level0_file_num_compaction_trigger`
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compaction_reason_ = CompactionReason::kLevelL0FilesNum; |
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} else { |
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// L1+ score = `Level files size` / `MaxBytesForLevel`
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compaction_reason_ = CompactionReason::kLevelMaxLevelSize; |
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} |
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break; |
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} else { |
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// didn't find the compaction, clear the inputs
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start_level_inputs_.clear(); |
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if (start_level_ == 0) { |
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skipped_l0_to_base = true; |
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// L0->base_level may be blocked due to ongoing L0->base_level
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// compactions. It may also be blocked by an ongoing compaction from
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// base_level downwards.
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//
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// In these cases, to reduce L0 file count and thus reduce likelihood
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// of write stalls, we can attempt compacting a span of files within
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// L0.
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if (PickIntraL0Compaction()) { |
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output_level_ = 0; |
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compaction_reason_ = CompactionReason::kLevelL0FilesNum; |
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break; |
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} |
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} |
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} |
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} |
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} |
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// if we didn't find a compaction, check if there are any files marked for
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// compaction
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if (start_level_inputs_.empty()) { |
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parent_index_ = base_index_ = -1; |
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compaction_picker_->PickFilesMarkedForCompaction( |
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cf_name_, vstorage_, &start_level_, &output_level_, |
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&start_level_inputs_); |
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if (!start_level_inputs_.empty()) { |
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is_manual_ = true; |
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compaction_reason_ = CompactionReason::kFilesMarkedForCompaction; |
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return; |
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} |
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} |
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// Bottommost Files Compaction on deleting tombstones
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if (start_level_inputs_.empty()) { |
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size_t i; |
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for (i = 0; i < vstorage_->BottommostFilesMarkedForCompaction().size(); |
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++i) { |
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auto& level_and_file = vstorage_->BottommostFilesMarkedForCompaction()[i]; |
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assert(!level_and_file.second->being_compacted); |
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start_level_inputs_.level = output_level_ = start_level_ = |
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level_and_file.first; |
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start_level_inputs_.files = {level_and_file.second}; |
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if (compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_, |
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&start_level_inputs_)) { |
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break; |
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} |
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} |
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if (i == vstorage_->BottommostFilesMarkedForCompaction().size()) { |
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start_level_inputs_.clear(); |
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} else { |
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assert(!start_level_inputs_.empty()); |
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compaction_reason_ = CompactionReason::kBottommostFiles; |
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return; |
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} |
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} |
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// TTL Compaction
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if (start_level_inputs_.empty()) { |
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PickExpiredTtlFiles(); |
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if (!start_level_inputs_.empty()) { |
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compaction_reason_ = CompactionReason::kTtl; |
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return; |
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} |
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} |
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// Periodic Compaction
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if (start_level_inputs_.empty()) { |
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PickFilesMarkedForPeriodicCompaction(); |
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if (!start_level_inputs_.empty()) { |
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compaction_reason_ = CompactionReason::kPeriodicCompaction; |
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return; |
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} |
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} |
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} |
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bool LevelCompactionBuilder::SetupOtherL0FilesIfNeeded() { |
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if (start_level_ == 0 && output_level_ != 0) { |
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return compaction_picker_->GetOverlappingL0Files( |
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vstorage_, &start_level_inputs_, output_level_, &parent_index_); |
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} |
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return true; |
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} |
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bool LevelCompactionBuilder::SetupOtherInputsIfNeeded() { |
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// Setup input files from output level. For output to L0, we only compact
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// spans of files that do not interact with any pending compactions, so don't
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// need to consider other levels.
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if (output_level_ != 0) { |
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output_level_inputs_.level = output_level_; |
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if (!compaction_picker_->SetupOtherInputs( |
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cf_name_, mutable_cf_options_, vstorage_, &start_level_inputs_, |
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&output_level_inputs_, &parent_index_, base_index_)) { |
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return false; |
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} |
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compaction_inputs_.push_back(start_level_inputs_); |
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if (!output_level_inputs_.empty()) { |
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compaction_inputs_.push_back(output_level_inputs_); |
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} |
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// In some edge cases we could pick a compaction that will be compacting
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// a key range that overlap with another running compaction, and both
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// of them have the same output level. This could happen if
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// (1) we are running a non-exclusive manual compaction
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// (2) AddFile ingest a new file into the LSM tree
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// We need to disallow this from happening.
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if (compaction_picker_->FilesRangeOverlapWithCompaction(compaction_inputs_, |
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output_level_)) { |
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// This compaction output could potentially conflict with the output
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// of a currently running compaction, we cannot run it.
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return false; |
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} |
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compaction_picker_->GetGrandparents(vstorage_, start_level_inputs_, |
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output_level_inputs_, &grandparents_); |
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} else { |
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compaction_inputs_.push_back(start_level_inputs_); |
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} |
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return true; |
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} |
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Compaction* LevelCompactionBuilder::PickCompaction() { |
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// Pick up the first file to start compaction. It may have been extended
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// to a clean cut.
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SetupInitialFiles(); |
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if (start_level_inputs_.empty()) { |
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return nullptr; |
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} |
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assert(start_level_ >= 0 && output_level_ >= 0); |
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// If it is a L0 -> base level compaction, we need to set up other L0
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// files if needed.
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if (!SetupOtherL0FilesIfNeeded()) { |
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return nullptr; |
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} |
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// Pick files in the output level and expand more files in the start level
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// if needed.
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if (!SetupOtherInputsIfNeeded()) { |
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return nullptr; |
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} |
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// Form a compaction object containing the files we picked.
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Compaction* c = GetCompaction(); |
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TEST_SYNC_POINT_CALLBACK("LevelCompactionPicker::PickCompaction:Return", c); |
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return c; |
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} |
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Compaction* LevelCompactionBuilder::GetCompaction() { |
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auto c = new Compaction( |
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vstorage_, ioptions_, mutable_cf_options_, std::move(compaction_inputs_), |
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output_level_, |
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MaxFileSizeForLevel(mutable_cf_options_, output_level_, |
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ioptions_.compaction_style, vstorage_->base_level(), |
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ioptions_.level_compaction_dynamic_level_bytes), |
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mutable_cf_options_.max_compaction_bytes, |
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GetPathId(ioptions_, mutable_cf_options_, output_level_), |
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GetCompressionType(ioptions_, vstorage_, mutable_cf_options_, |
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output_level_, vstorage_->base_level()), |
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GetCompressionOptions(ioptions_, vstorage_, output_level_), |
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/* max_subcompactions */ 0, std::move(grandparents_), is_manual_, |
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start_level_score_, false /* deletion_compaction */, compaction_reason_); |
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// If it's level 0 compaction, make sure we don't execute any other level 0
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// compactions in parallel
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compaction_picker_->RegisterCompaction(c); |
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// Creating a compaction influences the compaction score because the score
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// takes running compactions into account (by skipping files that are already
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// being compacted). Since we just changed compaction score, we recalculate it
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// here
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vstorage_->ComputeCompactionScore(ioptions_, mutable_cf_options_); |
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return c; |
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} |
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/*
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* Find the optimal path to place a file |
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* Given a level, finds the path where levels up to it will fit in levels |
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* up to and including this path |
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*/ |
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uint32_t LevelCompactionBuilder::GetPathId( |
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const ImmutableCFOptions& ioptions, |
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const MutableCFOptions& mutable_cf_options, int level) { |
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uint32_t p = 0; |
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assert(!ioptions.cf_paths.empty()); |
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// size remaining in the most recent path
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uint64_t current_path_size = ioptions.cf_paths[0].target_size; |
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uint64_t level_size; |
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int cur_level = 0; |
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// max_bytes_for_level_base denotes L1 size.
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// We estimate L0 size to be the same as L1.
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level_size = mutable_cf_options.max_bytes_for_level_base; |
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// Last path is the fallback
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while (p < ioptions.cf_paths.size() - 1) { |
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if (level_size <= current_path_size) { |
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if (cur_level == level) { |
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// Does desired level fit in this path?
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return p; |
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} else { |
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current_path_size -= level_size; |
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if (cur_level > 0) { |
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if (ioptions.level_compaction_dynamic_level_bytes) { |
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// Currently, level_compaction_dynamic_level_bytes is ignored when
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// multiple db paths are specified. https://github.com/facebook/
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// rocksdb/blob/master/db/column_family.cc.
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// Still, adding this check to avoid accidentally using
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// max_bytes_for_level_multiplier_additional
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level_size = static_cast<uint64_t>( |
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level_size * mutable_cf_options.max_bytes_for_level_multiplier); |
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} else { |
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level_size = static_cast<uint64_t>( |
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level_size * mutable_cf_options.max_bytes_for_level_multiplier * |
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mutable_cf_options.MaxBytesMultiplerAdditional(cur_level)); |
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} |
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} |
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cur_level++; |
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continue; |
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} |
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} |
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p++; |
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current_path_size = ioptions.cf_paths[p].target_size; |
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} |
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return p; |
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} |
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bool LevelCompactionBuilder::PickFileToCompact() { |
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// level 0 files are overlapping. So we cannot pick more
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// than one concurrent compactions at this level. This
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// could be made better by looking at key-ranges that are
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// being compacted at level 0.
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if (start_level_ == 0 && |
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!compaction_picker_->level0_compactions_in_progress()->empty()) { |
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TEST_SYNC_POINT("LevelCompactionPicker::PickCompactionBySize:0"); |
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return false; |
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} |
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start_level_inputs_.clear(); |
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assert(start_level_ >= 0); |
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// Pick the largest file in this level that is not already
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// being compacted
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const std::vector<int>& file_size = |
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vstorage_->FilesByCompactionPri(start_level_); |
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const std::vector<FileMetaData*>& level_files = |
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vstorage_->LevelFiles(start_level_); |
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unsigned int cmp_idx; |
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for (cmp_idx = vstorage_->NextCompactionIndex(start_level_); |
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cmp_idx < file_size.size(); cmp_idx++) { |
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int index = file_size[cmp_idx]; |
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auto* f = level_files[index]; |
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// do not pick a file to compact if it is being compacted
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// from n-1 level.
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if (f->being_compacted) { |
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continue; |
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} |
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start_level_inputs_.files.push_back(f); |
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start_level_inputs_.level = start_level_; |
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if (!compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_, |
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&start_level_inputs_) || |
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compaction_picker_->FilesRangeOverlapWithCompaction( |
||||
{start_level_inputs_}, output_level_)) { |
||||
// A locked (pending compaction) input-level file was pulled in due to
|
||||
// user-key overlap.
|
||||
start_level_inputs_.clear(); |
||||
continue; |
||||
} |
||||
|
||||
// Now that input level is fully expanded, we check whether any output files
|
||||
// are locked due to pending compaction.
|
||||
//
|
||||
// Note we rely on ExpandInputsToCleanCut() to tell us whether any output-
|
||||
// level files are locked, not just the extra ones pulled in for user-key
|
||||
// overlap.
|
||||
InternalKey smallest, largest; |
||||
compaction_picker_->GetRange(start_level_inputs_, &smallest, &largest); |
||||
CompactionInputFiles output_level_inputs; |
||||
output_level_inputs.level = output_level_; |
||||
vstorage_->GetOverlappingInputs(output_level_, &smallest, &largest, |
||||
&output_level_inputs.files); |
||||
if (!output_level_inputs.empty() && |
||||
!compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_, |
||||
&output_level_inputs)) { |
||||
start_level_inputs_.clear(); |
||||
continue; |
||||
} |
||||
base_index_ = index; |
||||
break; |
||||
} |
||||
|
||||
// store where to start the iteration in the next call to PickCompaction
|
||||
vstorage_->SetNextCompactionIndex(start_level_, cmp_idx); |
||||
|
||||
return start_level_inputs_.size() > 0; |
||||
} |
||||
|
||||
bool LevelCompactionBuilder::PickIntraL0Compaction() { |
||||
start_level_inputs_.clear(); |
||||
const std::vector<FileMetaData*>& level_files = |
||||
vstorage_->LevelFiles(0 /* level */); |
||||
if (level_files.size() < |
||||
static_cast<size_t>( |
||||
mutable_cf_options_.level0_file_num_compaction_trigger + 2) || |
||||
level_files[0]->being_compacted) { |
||||
// If L0 isn't accumulating much files beyond the regular trigger, don't
|
||||
// resort to L0->L0 compaction yet.
|
||||
return false; |
||||
} |
||||
return FindIntraL0Compaction( |
||||
level_files, kMinFilesForIntraL0Compaction, port::kMaxUint64, |
||||
mutable_cf_options_.max_compaction_bytes, &start_level_inputs_); |
||||
} |
||||
} // namespace
|
||||
|
||||
Compaction* LevelCompactionPicker::PickCompaction( |
||||
const std::string& cf_name, const MutableCFOptions& mutable_cf_options, |
||||
VersionStorageInfo* vstorage, LogBuffer* log_buffer) { |
||||
LevelCompactionBuilder builder(cf_name, vstorage, this, log_buffer, |
||||
mutable_cf_options, ioptions_); |
||||
return builder.PickCompaction(); |
||||
} |
||||
} // namespace rocksdb
|
||||
@ -0,0 +1,32 @@ |
||||
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||||
// This source code is licensed under both the GPLv2 (found in the
|
||||
// COPYING file in the root directory) and Apache 2.0 License
|
||||
// (found in the LICENSE.Apache file in the root directory).
|
||||
//
|
||||
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
||||
|
||||
#pragma once |
||||
|
||||
#include "db/compaction_picker.h" |
||||
|
||||
namespace rocksdb { |
||||
// Picking compactions for leveled compaction. See wiki page
|
||||
// https://github.com/facebook/rocksdb/wiki/Leveled-Compaction
|
||||
// for description of Leveled compaction.
|
||||
class LevelCompactionPicker : public CompactionPicker { |
||||
public: |
||||
LevelCompactionPicker(const ImmutableCFOptions& ioptions, |
||||
const InternalKeyComparator* icmp) |
||||
: CompactionPicker(ioptions, icmp) {} |
||||
virtual Compaction* PickCompaction(const std::string& cf_name, |
||||
const MutableCFOptions& mutable_cf_options, |
||||
VersionStorageInfo* vstorage, |
||||
LogBuffer* log_buffer) override; |
||||
|
||||
virtual bool NeedsCompaction( |
||||
const VersionStorageInfo* vstorage) const override; |
||||
}; |
||||
|
||||
} // namespace rocksdb
|
||||
Loading…
Reference in new issue