Moving Compaction class to separate header file
Summary: I'm sure we'll all agree that version_set.cc needs simplifying. This diff moves Compaction class to a separate file. The diff depends on D15171 and D15183 Test Plan: make check Reviewers: dhruba, haobo, kailiu, sdong Reviewed By: kailiu CC: leveldb Differential Revision: https://reviews.facebook.net/D15189
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db/compaction.cc
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214
db/compaction.cc
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@ -0,0 +1,214 @@
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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/compaction.h"
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namespace rocksdb {
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static uint64_t TotalFileSize(const std::vector<FileMetaData*>& files) {
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uint64_t sum = 0;
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for (size_t i = 0; i < files.size() && files[i]; i++) {
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sum += files[i]->file_size;
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}
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return sum;
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}
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Compaction::Compaction(Version* input_version, int level, int out_level,
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uint64_t target_file_size,
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uint64_t max_grandparent_overlap_bytes,
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bool seek_compaction, bool enable_compression)
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: level_(level),
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out_level_(out_level),
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max_output_file_size_(target_file_size),
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maxGrandParentOverlapBytes_(max_grandparent_overlap_bytes),
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input_version_(input_version),
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number_levels_(input_version_->NumberLevels()),
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seek_compaction_(seek_compaction),
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enable_compression_(enable_compression),
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grandparent_index_(0),
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seen_key_(false),
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overlapped_bytes_(0),
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base_index_(-1),
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parent_index_(-1),
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score_(0),
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bottommost_level_(false),
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is_full_compaction_(false),
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level_ptrs_(std::vector<size_t>(number_levels_)) {
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input_version_->Ref();
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edit_ = new VersionEdit();
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for (int i = 0; i < number_levels_; i++) {
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level_ptrs_[i] = 0;
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}
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}
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Compaction::~Compaction() {
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delete edit_;
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if (input_version_ != nullptr) {
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input_version_->Unref();
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}
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}
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bool Compaction::IsTrivialMove() const {
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// Avoid a move if there is lots of overlapping grandparent data.
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// Otherwise, the move could create a parent file that will require
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// a very expensive merge later on.
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// If level_== out_level_, the purpose is to force compaction filter to be
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// applied to that level, and thus cannot be a trivia move.
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return (level_ != out_level_ &&
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num_input_files(0) == 1 &&
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num_input_files(1) == 0 &&
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TotalFileSize(grandparents_) <= maxGrandParentOverlapBytes_);
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}
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void Compaction::AddInputDeletions(VersionEdit* edit) {
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for (int which = 0; which < 2; which++) {
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for (size_t i = 0; i < inputs_[which].size(); i++) {
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edit->DeleteFile(level_ + which, inputs_[which][i]->number);
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}
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}
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}
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bool Compaction::IsBaseLevelForKey(const Slice& user_key) {
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if (input_version_->vset_->options_->compaction_style ==
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kCompactionStyleUniversal) {
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return bottommost_level_;
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}
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// Maybe use binary search to find right entry instead of linear search?
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const Comparator* user_cmp = input_version_->vset_->icmp_.user_comparator();
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for (int lvl = level_ + 2; lvl < number_levels_; lvl++) {
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const std::vector<FileMetaData*>& files = input_version_->files_[lvl];
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for (; level_ptrs_[lvl] < files.size(); ) {
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FileMetaData* f = files[level_ptrs_[lvl]];
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if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
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// We've advanced far enough
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if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
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// Key falls in this file's range, so definitely not base level
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return false;
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}
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break;
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}
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level_ptrs_[lvl]++;
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}
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}
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return true;
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}
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bool Compaction::ShouldStopBefore(const Slice& internal_key) {
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// Scan to find earliest grandparent file that contains key.
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const InternalKeyComparator* icmp = &input_version_->vset_->icmp_;
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while (grandparent_index_ < grandparents_.size() &&
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icmp->Compare(internal_key,
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grandparents_[grandparent_index_]->largest.Encode()) > 0) {
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if (seen_key_) {
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overlapped_bytes_ += grandparents_[grandparent_index_]->file_size;
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}
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assert(grandparent_index_ + 1 >= grandparents_.size() ||
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icmp->Compare(grandparents_[grandparent_index_]->largest.Encode(),
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grandparents_[grandparent_index_+1]->smallest.Encode())
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< 0);
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grandparent_index_++;
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}
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seen_key_ = true;
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if (overlapped_bytes_ > maxGrandParentOverlapBytes_) {
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// Too much overlap for current output; start new output
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overlapped_bytes_ = 0;
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return true;
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} else {
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return false;
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}
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}
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// Mark (or clear) each file that is being compacted
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void Compaction::MarkFilesBeingCompacted(bool value) {
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for (int i = 0; i < 2; i++) {
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std::vector<FileMetaData*> v = inputs_[i];
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for (unsigned int j = 0; j < inputs_[i].size(); j++) {
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assert(value ? !inputs_[i][j]->being_compacted :
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inputs_[i][j]->being_compacted);
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inputs_[i][j]->being_compacted = value;
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}
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}
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}
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// Is this compaction producing files at the bottommost level?
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void Compaction::SetupBottomMostLevel(bool isManual) {
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if (input_version_->vset_->options_->compaction_style ==
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kCompactionStyleUniversal) {
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// If universal compaction style is used and manual
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// compaction is occuring, then we are guaranteed that
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// all files will be picked in a single compaction
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// run. We can safely set bottommost_level_ = true.
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// If it is not manual compaction, then bottommost_level_
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// is already set when the Compaction was created.
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if (isManual) {
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bottommost_level_ = true;
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}
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return;
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}
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bottommost_level_ = true;
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int num_levels = input_version_->vset_->NumberLevels();
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for (int i = output_level() + 1; i < num_levels; i++) {
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if (input_version_->NumLevelFiles(i) > 0) {
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bottommost_level_ = false;
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break;
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}
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}
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}
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void Compaction::ReleaseInputs() {
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if (input_version_ != nullptr) {
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input_version_->Unref();
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input_version_ = nullptr;
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}
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}
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void Compaction::ResetNextCompactionIndex() {
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input_version_->ResetNextCompactionIndex(level_);
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}
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static void InputSummary(std::vector<FileMetaData*>& files, char* output,
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int len) {
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int write = 0;
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for (unsigned int i = 0; i < files.size(); i++) {
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int sz = len - write;
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int ret = snprintf(output + write, sz, "%lu(%lu) ",
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(unsigned long)files.at(i)->number,
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(unsigned long)files.at(i)->file_size);
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if (ret < 0 || ret >= sz)
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break;
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write += ret;
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}
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}
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void Compaction::Summary(char* output, int len) {
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int write = snprintf(output, len,
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"Base version %lu Base level %d, seek compaction:%d, inputs:",
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(unsigned long)input_version_->GetVersionNumber(),
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level_,
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seek_compaction_);
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if (write < 0 || write > len) {
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return;
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}
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char level_low_summary[100];
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InputSummary(inputs_[0], level_low_summary, sizeof(level_low_summary));
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char level_up_summary[100];
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if (inputs_[1].size()) {
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InputSummary(inputs_[1], level_up_summary, sizeof(level_up_summary));
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} else {
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level_up_summary[0] = '\0';
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}
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snprintf(output + write, len - write, "[%s],[%s]",
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level_low_summary, level_up_summary);
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}
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} // namespace rocksdb
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131
db/compaction.h
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131
db/compaction.h
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@ -0,0 +1,131 @@
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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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#pragma once
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#include "db/version_set.h"
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namespace rocksdb {
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class Version;
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// A Compaction encapsulates information about a compaction.
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class Compaction {
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public:
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~Compaction();
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// Return the level that is being compacted. Inputs from "level"
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// will be merged.
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int level() const { return level_; }
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// Outputs will go to this level
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int output_level() const { return out_level_; }
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// Return the object that holds the edits to the descriptor done
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// by this compaction.
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VersionEdit* edit() { return edit_; }
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// "which" must be either 0 or 1
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int num_input_files(int which) const { return inputs_[which].size(); }
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// Return the ith input file at "level()+which" ("which" must be 0 or 1).
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FileMetaData* input(int which, int i) const { return inputs_[which][i]; }
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// Maximum size of files to build during this compaction.
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uint64_t MaxOutputFileSize() const { return max_output_file_size_; }
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// Whether compression will be enabled for compaction outputs
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bool enable_compression() const { return enable_compression_; }
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// Is this a trivial compaction that can be implemented by just
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// moving a single input file to the next level (no merging or splitting)
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bool IsTrivialMove() const;
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// Add all inputs to this compaction as delete operations to *edit.
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void AddInputDeletions(VersionEdit* edit);
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// Returns true if the information we have available guarantees that
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// the compaction is producing data in "level+1" for which no data exists
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// in levels greater than "level+1".
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bool IsBaseLevelForKey(const Slice& user_key);
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// Returns true iff we should stop building the current output
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// before processing "internal_key".
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bool ShouldStopBefore(const Slice& internal_key);
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// Release the input version for the compaction, once the compaction
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// is successful.
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void ReleaseInputs();
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void Summary(char* output, int len);
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// Return the score that was used to pick this compaction run.
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double score() const { return score_; }
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// Is this compaction creating a file in the bottom most level?
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bool BottomMostLevel() { return bottommost_level_; }
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// Does this compaction include all sst files?
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bool IsFullCompaction() { return is_full_compaction_; }
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private:
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friend class Version;
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friend class VersionSet;
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Compaction(Version* input_version, int level, int out_level,
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uint64_t target_file_size, uint64_t max_grandparent_overlap_bytes,
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bool seek_compaction = false, bool enable_compression = true);
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int level_;
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int out_level_; // levels to which output files are stored
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uint64_t max_output_file_size_;
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uint64_t maxGrandParentOverlapBytes_;
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Version* input_version_;
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VersionEdit* edit_;
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int number_levels_;
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bool seek_compaction_;
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bool enable_compression_;
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// Each compaction reads inputs from "level_" and "level_+1"
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std::vector<FileMetaData*> inputs_[2]; // The two sets of inputs
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// State used to check for number of of overlapping grandparent files
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// (parent == level_ + 1, grandparent == level_ + 2)
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std::vector<FileMetaData*> grandparents_;
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size_t grandparent_index_; // Index in grandparent_starts_
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bool seen_key_; // Some output key has been seen
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uint64_t overlapped_bytes_; // Bytes of overlap between current output
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// and grandparent files
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int base_index_; // index of the file in files_[level_]
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int parent_index_; // index of some file with same range in files_[level_+1]
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double score_; // score that was used to pick this compaction.
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// Is this compaction creating a file in the bottom most level?
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bool bottommost_level_;
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// Does this compaction include all sst files?
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bool is_full_compaction_;
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// level_ptrs_ holds indices into input_version_->levels_: our state
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// is that we are positioned at one of the file ranges for each
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// higher level than the ones involved in this compaction (i.e. for
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// all L >= level_ + 2).
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std::vector<size_t> level_ptrs_;
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// mark (or clear) all files that are being compacted
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void MarkFilesBeingCompacted(bool);
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// Initialize whether compaction producing files at the bottommost level
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void SetupBottomMostLevel(bool isManual);
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// In case of compaction error, reset the nextIndex that is used
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// to pick up the next file to be compacted from files_by_size_
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void ResetNextCompactionIndex();
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};
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} // namespace rocksdb
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@ -18,6 +18,7 @@
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#include "db/memtable.h"
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#include "db/merge_context.h"
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#include "db/table_cache.h"
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#include "db/compaction.h"
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#include "rocksdb/env.h"
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/table.h"
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@ -2953,196 +2954,4 @@ Compaction* VersionSet::CompactRange(int input_level,
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return c;
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}
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Compaction::Compaction(Version* input_version, int level, int out_level,
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uint64_t target_file_size,
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uint64_t max_grandparent_overlap_bytes,
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bool seek_compaction, bool enable_compression)
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: level_(level),
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out_level_(out_level),
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max_output_file_size_(target_file_size),
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maxGrandParentOverlapBytes_(max_grandparent_overlap_bytes),
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input_version_(input_version),
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number_levels_(input_version_->NumberLevels()),
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seek_compaction_(seek_compaction),
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enable_compression_(enable_compression),
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grandparent_index_(0),
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seen_key_(false),
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overlapped_bytes_(0),
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base_index_(-1),
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parent_index_(-1),
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score_(0),
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bottommost_level_(false),
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is_full_compaction_(false),
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level_ptrs_(std::vector<size_t>(number_levels_)) {
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input_version_->Ref();
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edit_ = new VersionEdit();
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for (int i = 0; i < number_levels_; i++) {
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level_ptrs_[i] = 0;
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}
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}
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Compaction::~Compaction() {
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delete edit_;
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if (input_version_ != nullptr) {
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input_version_->Unref();
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}
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}
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bool Compaction::IsTrivialMove() const {
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// Avoid a move if there is lots of overlapping grandparent data.
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// Otherwise, the move could create a parent file that will require
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// a very expensive merge later on.
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// If level_== out_level_, the purpose is to force compaction filter to be
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// applied to that level, and thus cannot be a trivia move.
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return (level_ != out_level_ &&
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num_input_files(0) == 1 &&
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num_input_files(1) == 0 &&
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TotalFileSize(grandparents_) <= maxGrandParentOverlapBytes_);
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}
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void Compaction::AddInputDeletions(VersionEdit* edit) {
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for (int which = 0; which < 2; which++) {
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for (size_t i = 0; i < inputs_[which].size(); i++) {
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edit->DeleteFile(level_ + which, inputs_[which][i]->number);
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}
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}
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}
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bool Compaction::IsBaseLevelForKey(const Slice& user_key) {
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if (input_version_->vset_->options_->compaction_style ==
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kCompactionStyleUniversal) {
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return bottommost_level_;
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}
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// Maybe use binary search to find right entry instead of linear search?
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const Comparator* user_cmp = input_version_->vset_->icmp_.user_comparator();
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for (int lvl = level_ + 2; lvl < number_levels_; lvl++) {
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const std::vector<FileMetaData*>& files = input_version_->files_[lvl];
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for (; level_ptrs_[lvl] < files.size(); ) {
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FileMetaData* f = files[level_ptrs_[lvl]];
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if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
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// We've advanced far enough
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if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
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// Key falls in this file's range, so definitely not base level
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return false;
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}
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break;
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}
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level_ptrs_[lvl]++;
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}
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}
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return true;
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}
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bool Compaction::ShouldStopBefore(const Slice& internal_key) {
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// Scan to find earliest grandparent file that contains key.
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const InternalKeyComparator* icmp = &input_version_->vset_->icmp_;
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while (grandparent_index_ < grandparents_.size() &&
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icmp->Compare(internal_key,
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grandparents_[grandparent_index_]->largest.Encode()) > 0) {
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if (seen_key_) {
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overlapped_bytes_ += grandparents_[grandparent_index_]->file_size;
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}
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assert(grandparent_index_ + 1 >= grandparents_.size() ||
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icmp->Compare(grandparents_[grandparent_index_]->largest.Encode(),
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grandparents_[grandparent_index_+1]->smallest.Encode())
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< 0);
|
||||
grandparent_index_++;
|
||||
}
|
||||
seen_key_ = true;
|
||||
|
||||
if (overlapped_bytes_ > maxGrandParentOverlapBytes_) {
|
||||
// Too much overlap for current output; start new output
|
||||
overlapped_bytes_ = 0;
|
||||
return true;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// Mark (or clear) each file that is being compacted
|
||||
void Compaction::MarkFilesBeingCompacted(bool value) {
|
||||
for (int i = 0; i < 2; i++) {
|
||||
std::vector<FileMetaData*> v = inputs_[i];
|
||||
for (unsigned int j = 0; j < inputs_[i].size(); j++) {
|
||||
assert(value ? !inputs_[i][j]->being_compacted :
|
||||
inputs_[i][j]->being_compacted);
|
||||
inputs_[i][j]->being_compacted = value;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Is this compaction producing files at the bottommost level?
|
||||
void Compaction::SetupBottomMostLevel(bool isManual) {
|
||||
if (input_version_->vset_->options_->compaction_style ==
|
||||
kCompactionStyleUniversal) {
|
||||
// If universal compaction style is used and manual
|
||||
// compaction is occuring, then we are guaranteed that
|
||||
// all files will be picked in a single compaction
|
||||
// run. We can safely set bottommost_level_ = true.
|
||||
// If it is not manual compaction, then bottommost_level_
|
||||
// is already set when the Compaction was created.
|
||||
if (isManual) {
|
||||
bottommost_level_ = true;
|
||||
}
|
||||
return;
|
||||
}
|
||||
bottommost_level_ = true;
|
||||
int num_levels = input_version_->vset_->NumberLevels();
|
||||
for (int i = output_level() + 1; i < num_levels; i++) {
|
||||
if (input_version_->NumLevelFiles(i) > 0) {
|
||||
bottommost_level_ = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void Compaction::ReleaseInputs() {
|
||||
if (input_version_ != nullptr) {
|
||||
input_version_->Unref();
|
||||
input_version_ = nullptr;
|
||||
}
|
||||
}
|
||||
|
||||
void Compaction::ResetNextCompactionIndex() {
|
||||
input_version_->ResetNextCompactionIndex(level_);
|
||||
}
|
||||
|
||||
static void InputSummary(std::vector<FileMetaData*>& files, char* output,
|
||||
int len) {
|
||||
int write = 0;
|
||||
for (unsigned int i = 0; i < files.size(); i++) {
|
||||
int sz = len - write;
|
||||
int ret = snprintf(output + write, sz, "%lu(%lu) ",
|
||||
(unsigned long)files.at(i)->number,
|
||||
(unsigned long)files.at(i)->file_size);
|
||||
if (ret < 0 || ret >= sz)
|
||||
break;
|
||||
write += ret;
|
||||
}
|
||||
}
|
||||
|
||||
void Compaction::Summary(char* output, int len) {
|
||||
int write = snprintf(output, len,
|
||||
"Base version %lu Base level %d, seek compaction:%d, inputs:",
|
||||
(unsigned long)input_version_->GetVersionNumber(),
|
||||
level_,
|
||||
seek_compaction_);
|
||||
if (write < 0 || write > len) {
|
||||
return;
|
||||
}
|
||||
|
||||
char level_low_summary[100];
|
||||
InputSummary(inputs_[0], level_low_summary, sizeof(level_low_summary));
|
||||
char level_up_summary[100];
|
||||
if (inputs_[1].size()) {
|
||||
InputSummary(inputs_[1], level_up_summary, sizeof(level_up_summary));
|
||||
} else {
|
||||
level_up_summary[0] = '\0';
|
||||
}
|
||||
|
||||
snprintf(output + write, len - write, "[%s],[%s]",
|
||||
level_low_summary, level_up_summary);
|
||||
}
|
||||
|
||||
} // namespace rocksdb
|
||||
|
115
db/version_set.h
115
db/version_set.h
@ -27,6 +27,7 @@
|
||||
#include "db/version_edit.h"
|
||||
#include "port/port.h"
|
||||
#include "db/table_cache.h"
|
||||
#include "db/compaction.h"
|
||||
|
||||
namespace rocksdb {
|
||||
|
||||
@ -546,118 +547,4 @@ class VersionSet {
|
||||
VersionEdit* edit, port::Mutex* mu);
|
||||
};
|
||||
|
||||
// A Compaction encapsulates information about a compaction.
|
||||
class Compaction {
|
||||
public:
|
||||
~Compaction();
|
||||
|
||||
// Return the level that is being compacted. Inputs from "level"
|
||||
// will be merged.
|
||||
int level() const { return level_; }
|
||||
|
||||
// Outputs will go to this level
|
||||
int output_level() const { return out_level_; }
|
||||
|
||||
// Return the object that holds the edits to the descriptor done
|
||||
// by this compaction.
|
||||
VersionEdit* edit() { return edit_; }
|
||||
|
||||
// "which" must be either 0 or 1
|
||||
int num_input_files(int which) const { return inputs_[which].size(); }
|
||||
|
||||
// Return the ith input file at "level()+which" ("which" must be 0 or 1).
|
||||
FileMetaData* input(int which, int i) const { return inputs_[which][i]; }
|
||||
|
||||
// Maximum size of files to build during this compaction.
|
||||
uint64_t MaxOutputFileSize() const { return max_output_file_size_; }
|
||||
|
||||
// Whether compression will be enabled for compaction outputs
|
||||
bool enable_compression() const { return enable_compression_; }
|
||||
|
||||
// Is this a trivial compaction that can be implemented by just
|
||||
// moving a single input file to the next level (no merging or splitting)
|
||||
bool IsTrivialMove() const;
|
||||
|
||||
// Add all inputs to this compaction as delete operations to *edit.
|
||||
void AddInputDeletions(VersionEdit* edit);
|
||||
|
||||
// Returns true if the information we have available guarantees that
|
||||
// the compaction is producing data in "level+1" for which no data exists
|
||||
// in levels greater than "level+1".
|
||||
bool IsBaseLevelForKey(const Slice& user_key);
|
||||
|
||||
// Returns true iff we should stop building the current output
|
||||
// before processing "internal_key".
|
||||
bool ShouldStopBefore(const Slice& internal_key);
|
||||
|
||||
// Release the input version for the compaction, once the compaction
|
||||
// is successful.
|
||||
void ReleaseInputs();
|
||||
|
||||
void Summary(char* output, int len);
|
||||
|
||||
// Return the score that was used to pick this compaction run.
|
||||
double score() const { return score_; }
|
||||
|
||||
// Is this compaction creating a file in the bottom most level?
|
||||
bool BottomMostLevel() { return bottommost_level_; }
|
||||
|
||||
// Does this compaction include all sst files?
|
||||
bool IsFullCompaction() { return is_full_compaction_; }
|
||||
|
||||
private:
|
||||
friend class Version;
|
||||
friend class VersionSet;
|
||||
|
||||
Compaction(Version* input_version, int level, int out_level,
|
||||
uint64_t target_file_size, uint64_t max_grandparent_overlap_bytes,
|
||||
bool seek_compaction = false, bool enable_compression = true);
|
||||
|
||||
int level_;
|
||||
int out_level_; // levels to which output files are stored
|
||||
uint64_t max_output_file_size_;
|
||||
uint64_t maxGrandParentOverlapBytes_;
|
||||
Version* input_version_;
|
||||
VersionEdit* edit_;
|
||||
int number_levels_;
|
||||
|
||||
bool seek_compaction_;
|
||||
bool enable_compression_;
|
||||
|
||||
// Each compaction reads inputs from "level_" and "level_+1"
|
||||
std::vector<FileMetaData*> inputs_[2]; // The two sets of inputs
|
||||
|
||||
// State used to check for number of of overlapping grandparent files
|
||||
// (parent == level_ + 1, grandparent == level_ + 2)
|
||||
std::vector<FileMetaData*> grandparents_;
|
||||
size_t grandparent_index_; // Index in grandparent_starts_
|
||||
bool seen_key_; // Some output key has been seen
|
||||
uint64_t overlapped_bytes_; // Bytes of overlap between current output
|
||||
// and grandparent files
|
||||
int base_index_; // index of the file in files_[level_]
|
||||
int parent_index_; // index of some file with same range in files_[level_+1]
|
||||
double score_; // score that was used to pick this compaction.
|
||||
|
||||
// Is this compaction creating a file in the bottom most level?
|
||||
bool bottommost_level_;
|
||||
// Does this compaction include all sst files?
|
||||
bool is_full_compaction_;
|
||||
|
||||
// level_ptrs_ holds indices into input_version_->levels_: our state
|
||||
// is that we are positioned at one of the file ranges for each
|
||||
// higher level than the ones involved in this compaction (i.e. for
|
||||
// all L >= level_ + 2).
|
||||
std::vector<size_t> level_ptrs_;
|
||||
|
||||
// mark (or clear) all files that are being compacted
|
||||
void MarkFilesBeingCompacted(bool);
|
||||
|
||||
// Initialize whether compaction producing files at the bottommost level
|
||||
void SetupBottomMostLevel(bool isManual);
|
||||
|
||||
// In case of compaction error, reset the nextIndex that is used
|
||||
// to pick up the next file to be compacted from files_by_size_
|
||||
void ResetNextCompactionIndex();
|
||||
};
|
||||
|
||||
} // namespace rocksdb
|
||||
|
Loading…
Reference in New Issue
Block a user