fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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210 lines
7.7 KiB
210 lines
7.7 KiB
// 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/flush_job.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 <vector>
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#include "db/builder.h"
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "db/memtable.h"
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#include "db/memtable_list.h"
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#include "db/merge_context.h"
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#include "db/version_set.h"
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#include "port/port.h"
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#include "port/likely.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/status.h"
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#include "rocksdb/table.h"
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#include "table/block.h"
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#include "table/block_based_table_factory.h"
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#include "table/merger.h"
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#include "table/table_builder.h"
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#include "table/two_level_iterator.h"
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#include "util/coding.h"
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#include "util/logging.h"
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#include "util/log_buffer.h"
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#include "util/mutexlock.h"
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#include "util/perf_context_imp.h"
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#include "util/iostats_context_imp.h"
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#include "util/stop_watch.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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FlushJob::FlushJob(const std::string& dbname, ColumnFamilyData* cfd,
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const DBOptions& db_options,
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const MutableCFOptions& mutable_cf_options,
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const EnvOptions& env_options, VersionSet* versions,
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port::Mutex* db_mutex, std::atomic<bool>* shutting_down,
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SequenceNumber newest_snapshot, JobContext* job_context,
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LogBuffer* log_buffer, Directory* db_directory,
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CompressionType output_compression, Statistics* stats)
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: dbname_(dbname),
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cfd_(cfd),
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db_options_(db_options),
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mutable_cf_options_(mutable_cf_options),
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env_options_(env_options),
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versions_(versions),
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db_mutex_(db_mutex),
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shutting_down_(shutting_down),
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newest_snapshot_(newest_snapshot),
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job_context_(job_context),
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log_buffer_(log_buffer),
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db_directory_(db_directory),
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output_compression_(output_compression),
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stats_(stats) {}
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Status FlushJob::Run() {
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// Save the contents of the earliest memtable as a new Table
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uint64_t file_number;
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autovector<MemTable*> mems;
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cfd_->imm()->PickMemtablesToFlush(&mems);
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if (mems.empty()) {
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LogToBuffer(log_buffer_, "[%s] Nothing in memtable to flush",
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cfd_->GetName().c_str());
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return Status::OK();
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}
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// entries mems are (implicitly) sorted in ascending order by their created
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// time. We will use the first memtable's `edit` to keep the meta info for
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// this flush.
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MemTable* m = mems[0];
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VersionEdit* edit = m->GetEdits();
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edit->SetPrevLogNumber(0);
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// SetLogNumber(log_num) indicates logs with number smaller than log_num
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// will no longer be picked up for recovery.
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edit->SetLogNumber(mems.back()->GetNextLogNumber());
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edit->SetColumnFamily(cfd_->GetID());
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// This will release and re-acquire the mutex.
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Status s = WriteLevel0Table(mems, edit, &file_number);
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if (s.ok() &&
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(shutting_down_->load(std::memory_order_acquire) || cfd_->IsDropped())) {
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s = Status::ShutdownInProgress(
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"Database shutdown or Column family drop during flush");
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}
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if (!s.ok()) {
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cfd_->imm()->RollbackMemtableFlush(mems, file_number);
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} else {
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// Replace immutable memtable with the generated Table
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s = cfd_->imm()->InstallMemtableFlushResults(
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cfd_, mutable_cf_options_, mems, versions_, db_mutex_, file_number,
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&job_context_->memtables_to_free, db_directory_, log_buffer_);
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}
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return s;
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}
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Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
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VersionEdit* edit, uint64_t* filenumber) {
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db_mutex_->AssertHeld();
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const uint64_t start_micros = db_options_.env->NowMicros();
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FileMetaData meta;
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meta.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
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*filenumber = meta.fd.GetNumber();
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// path 0 for level 0 file.
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const SequenceNumber earliest_seqno_in_memtable =
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mems[0]->GetFirstSequenceNumber();
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Version* base = cfd_->current();
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base->Ref(); // it is likely that we do not need this reference
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Status s;
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{
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db_mutex_->Unlock();
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if (log_buffer_) {
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log_buffer_->FlushBufferToLog();
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}
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std::vector<Iterator*> memtables;
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ReadOptions ro;
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ro.total_order_seek = true;
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Arena arena;
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for (MemTable* m : mems) {
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Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
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"[%s] Flushing memtable with next log file: %" PRIu64 "\n",
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cfd_->GetName().c_str(), m->GetNextLogNumber());
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memtables.push_back(m->NewIterator(ro, &arena));
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}
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{
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ScopedArenaIterator iter(NewMergingIterator(&cfd_->internal_comparator(),
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&memtables[0],
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memtables.size(), &arena));
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Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
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"[%s] Level-0 flush table #%" PRIu64 ": started",
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cfd_->GetName().c_str(), meta.fd.GetNumber());
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s = BuildTable(dbname_, db_options_.env, *cfd_->ioptions(), env_options_,
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cfd_->table_cache(), iter.get(), &meta,
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cfd_->internal_comparator(), newest_snapshot_,
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earliest_seqno_in_memtable, output_compression_,
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cfd_->ioptions()->compression_opts, Env::IO_HIGH);
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LogFlush(db_options_.info_log);
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}
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Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
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"[%s] Level-0 flush table #%" PRIu64 ": %" PRIu64 " bytes %s",
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cfd_->GetName().c_str(), meta.fd.GetNumber(), meta.fd.GetFileSize(),
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s.ToString().c_str());
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if (!db_options_.disableDataSync && db_directory_ != nullptr) {
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db_directory_->Fsync();
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}
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db_mutex_->Lock();
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}
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base->Unref();
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// re-acquire the most current version
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base = cfd_->current();
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// Note that if file_size is zero, the file has been deleted and
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// should not be added to the manifest.
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int level = 0;
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if (s.ok() && meta.fd.GetFileSize() > 0) {
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const Slice min_user_key = meta.smallest.user_key();
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const Slice max_user_key = meta.largest.user_key();
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// if we have more than 1 background thread, then we cannot
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// insert files directly into higher levels because some other
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// threads could be concurrently producing compacted files for
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// that key range.
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if (base != nullptr && db_options_.max_background_compactions <= 1 &&
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db_options_.max_background_flushes == 0 &&
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cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
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level = base->storage_info()->PickLevelForMemTableOutput(
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mutable_cf_options_, min_user_key, max_user_key);
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}
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edit->AddFile(level, meta.fd.GetNumber(), meta.fd.GetPathId(),
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meta.fd.GetFileSize(), meta.smallest, meta.largest,
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meta.smallest_seqno, meta.largest_seqno);
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}
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InternalStats::CompactionStats stats(1);
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stats.micros = db_options_.env->NowMicros() - start_micros;
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stats.bytes_written = meta.fd.GetFileSize();
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cfd_->internal_stats()->AddCompactionStats(level, stats);
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cfd_->internal_stats()->AddCFStats(InternalStats::BYTES_FLUSHED,
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meta.fd.GetFileSize());
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RecordTick(stats_, COMPACT_WRITE_BYTES, meta.fd.GetFileSize());
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return s;
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}
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} // namespace rocksdb
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