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rocksdb/db/flush_job.cc

301 lines
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same 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.
#include "db/flush_job.h"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <algorithm>
#include <vector>
#include "db/builder.h"
#include "db/db_iter.h"
#include "db/dbformat.h"
#include "db/event_helpers.h"
#include "db/filename.h"
#include "db/log_reader.h"
#include "db/log_writer.h"
#include "db/memtable.h"
#include "db/memtable_list.h"
#include "db/merge_context.h"
#include "db/version_set.h"
#include "port/port.h"
#include "port/likely.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/statistics.h"
#include "rocksdb/status.h"
#include "rocksdb/table.h"
#include "table/block.h"
#include "table/block_based_table_factory.h"
#include "table/merger.h"
#include "table/table_builder.h"
#include "table/two_level_iterator.h"
#include "util/coding.h"
#include "util/event_logger.h"
#include "util/file_util.h"
#include "util/logging.h"
#include "util/log_buffer.h"
#include "util/mutexlock.h"
#include "util/perf_context_imp.h"
#include "util/iostats_context_imp.h"
#include "util/stop_watch.h"
#include "util/sync_point.h"
#include "util/thread_status_util.h"
namespace rocksdb {
FlushJob::FlushJob(const std::string& dbname, ColumnFamilyData* cfd,
const DBOptions& db_options,
const MutableCFOptions& mutable_cf_options,
const EnvOptions& env_options, VersionSet* versions,
InstrumentedMutex* db_mutex,
std::atomic<bool>* shutting_down,
SequenceNumber newest_snapshot, JobContext* job_context,
LogBuffer* log_buffer, Directory* db_directory,
Directory* output_file_directory,
CompressionType output_compression, Statistics* stats,
EventLogger* event_logger)
: dbname_(dbname),
cfd_(cfd),
db_options_(db_options),
mutable_cf_options_(mutable_cf_options),
env_options_(env_options),
versions_(versions),
db_mutex_(db_mutex),
shutting_down_(shutting_down),
newest_snapshot_(newest_snapshot),
job_context_(job_context),
log_buffer_(log_buffer),
db_directory_(db_directory),
output_file_directory_(output_file_directory),
output_compression_(output_compression),
stats_(stats),
event_logger_(event_logger) {
// Update the thread status to indicate flush.
ReportStartedFlush();
TEST_SYNC_POINT("FlushJob::FlushJob()");
}
FlushJob::~FlushJob() {
ThreadStatusUtil::ResetThreadStatus();
}
void FlushJob::ReportStartedFlush() {
ThreadStatusUtil::SetColumnFamily(cfd_);
ThreadStatusUtil::SetThreadOperation(ThreadStatus::OP_FLUSH);
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_JOB_ID,
job_context_->job_id);
IOSTATS_RESET(bytes_written);
}
void FlushJob::ReportFlushInputSize(const autovector<MemTable*>& mems) {
uint64_t input_size = 0;
for (auto* mem : mems) {
input_size += mem->ApproximateMemoryUsage();
}
ThreadStatusUtil::IncreaseThreadOperationProperty(
ThreadStatus::FLUSH_BYTES_MEMTABLES,
input_size);
}
void FlushJob::RecordFlushIOStats() {
ThreadStatusUtil::IncreaseThreadOperationProperty(
ThreadStatus::FLUSH_BYTES_WRITTEN, IOSTATS(bytes_written));
IOSTATS_RESET(bytes_written);
}
Status FlushJob::Run(FileMetaData* file_meta) {
AutoThreadOperationStageUpdater stage_run(
ThreadStatus::STAGE_FLUSH_RUN);
// Save the contents of the earliest memtable as a new Table
FileMetaData meta;
autovector<MemTable*> mems;
cfd_->imm()->PickMemtablesToFlush(&mems);
if (mems.empty()) {
LogToBuffer(log_buffer_, "[%s] Nothing in memtable to flush",
cfd_->GetName().c_str());
return Status::OK();
}
ReportFlushInputSize(mems);
// entries mems are (implicitly) sorted in ascending order by their created
// time. We will use the first memtable's `edit` to keep the meta info for
// this flush.
MemTable* m = mems[0];
VersionEdit* edit = m->GetEdits();
edit->SetPrevLogNumber(0);
// SetLogNumber(log_num) indicates logs with number smaller than log_num
// will no longer be picked up for recovery.
edit->SetLogNumber(mems.back()->GetNextLogNumber());
edit->SetColumnFamily(cfd_->GetID());
// This will release and re-acquire the mutex.
Status s = WriteLevel0Table(mems, edit, &meta);
if (s.ok() &&
(shutting_down_->load(std::memory_order_acquire) || cfd_->IsDropped())) {
s = Status::ShutdownInProgress(
"Database shutdown or Column family drop during flush");
}
if (!s.ok()) {
cfd_->imm()->RollbackMemtableFlush(mems, meta.fd.GetNumber());
} else {
// Replace immutable memtable with the generated Table
s = cfd_->imm()->InstallMemtableFlushResults(
cfd_, mutable_cf_options_, mems, versions_, db_mutex_,
meta.fd.GetNumber(), &job_context_->memtables_to_free, db_directory_,
log_buffer_);
}
if (s.ok() && file_meta != nullptr) {
*file_meta = meta;
}
RecordFlushIOStats();
auto stream = event_logger_->LogToBuffer(log_buffer_);
stream << "job" << job_context_->job_id << "event"
<< "flush_finished";
stream << "lsm_state";
stream.StartArray();
auto vstorage = cfd_->current()->storage_info();
for (int level = 0; level < vstorage->num_levels(); ++level) {
stream << vstorage->NumLevelFiles(level);
}
stream.EndArray();
return s;
}
Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
VersionEdit* edit, FileMetaData* meta) {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_FLUSH_WRITE_L0);
db_mutex_->AssertHeld();
const uint64_t start_micros = db_options_.env->NowMicros();
// path 0 for level 0 file.
meta->fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
const SequenceNumber earliest_seqno_in_memtable =
mems[0]->GetFirstSequenceNumber();
Version* base = cfd_->current();
base->Ref(); // it is likely that we do not need this reference
Status s;
{
db_mutex_->Unlock();
if (log_buffer_) {
log_buffer_->FlushBufferToLog();
}
std::vector<Iterator*> memtables;
ReadOptions ro;
ro.total_order_seek = true;
Arena arena;
uint64_t total_num_entries = 0, total_num_deletes = 0;
size_t total_memory_usage = 0;
for (MemTable* m : mems) {
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Flushing memtable with next log file: %" PRIu64 "\n",
cfd_->GetName().c_str(), job_context_->job_id, m->GetNextLogNumber());
memtables.push_back(m->NewIterator(ro, &arena));
total_num_entries += m->num_entries();
total_num_deletes += m->num_deletes();
total_memory_usage += m->ApproximateMemoryUsage();
}
event_logger_->Log() << "job" << job_context_->job_id << "event"
<< "flush_started"
<< "num_memtables" << mems.size() << "num_entries"
<< total_num_entries << "num_deletes"
<< total_num_deletes << "memory_usage"
<< total_memory_usage;
TableFileCreationInfo info;
{
ScopedArenaIterator iter(
NewMergingIterator(&cfd_->internal_comparator(), &memtables[0],
static_cast<int>(memtables.size()), &arena));
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": started",
cfd_->GetName().c_str(), job_context_->job_id, meta->fd.GetNumber());
TEST_SYNC_POINT_CALLBACK("FlushJob::WriteLevel0Table:output_compression",
&output_compression_);
s = BuildTable(
dbname_, db_options_.env, *cfd_->ioptions(), env_options_,
cfd_->table_cache(), iter.get(), meta, cfd_->internal_comparator(),
cfd_->int_tbl_prop_collector_factories(), newest_snapshot_,
earliest_seqno_in_memtable, output_compression_,
cfd_->ioptions()->compression_opts,
mutable_cf_options_.paranoid_file_checks, cfd_->internal_stats(),
Env::IO_HIGH, &info.table_properties);
LogFlush(db_options_.info_log);
}
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": %" PRIu64
" bytes %s"
"%s",
cfd_->GetName().c_str(), job_context_->job_id, meta->fd.GetNumber(),
meta->fd.GetFileSize(), s.ToString().c_str(),
meta->marked_for_compaction ? " (needs compaction)" : "");
// output to event logger
if (s.ok()) {
info.db_name = dbname_;
info.cf_name = cfd_->GetName();
info.file_path = TableFileName(db_options_.db_paths,
meta->fd.GetNumber(),
meta->fd.GetPathId());
info.file_size = meta->fd.GetFileSize();
info.job_id = job_context_->job_id;
EventHelpers::LogAndNotifyTableFileCreation(
event_logger_, db_options_.listeners,
meta->fd, info);
TEST_SYNC_POINT("FlushJob::LogAndNotifyTableFileCreation()");
}
if (!db_options_.disableDataSync && output_file_directory_ != nullptr) {
output_file_directory_->Fsync();
}
db_mutex_->Lock();
}
base->Unref();
// re-acquire the most current version
base = cfd_->current();
// Note that if file_size is zero, the file has been deleted and
// should not be added to the manifest.
if (s.ok() && meta->fd.GetFileSize() > 0) {
// if we have more than 1 background thread, then we cannot
// insert files directly into higher levels because some other
// threads could be concurrently producing compacted files for
// that key range.
// Add file to L0
edit->AddFile(0 /* level */, meta->fd.GetNumber(), meta->fd.GetPathId(),
meta->fd.GetFileSize(), meta->smallest, meta->largest,
meta->smallest_seqno, meta->largest_seqno,
meta->marked_for_compaction);
}
InternalStats::CompactionStats stats(1);
stats.micros = db_options_.env->NowMicros() - start_micros;
stats.bytes_written = meta->fd.GetFileSize();
cfd_->internal_stats()->AddCompactionStats(0 /* level */, stats);
cfd_->internal_stats()->AddCFStats(InternalStats::BYTES_FLUSHED,
meta->fd.GetFileSize());
RecordTick(stats_, COMPACT_WRITE_BYTES, meta->fd.GetFileSize());
return s;
}
} // namespace rocksdb