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rocksdb/db/compaction_job.cc
sdong 3ae386eafe Add statistic histogram "rocksdb.sst.read.micros" 
Summary: Measure read latency histogram and put in statistics. Compaction inputs are excluded from it when possible (unfortunately usually no possible as we usually take table reader from table cache.

Test Plan:
Run db_bench and it shows the stats, like:

rocksdb.sst.read.micros statistics Percentiles :=> 50 : 1.238522 95 : 2.529740 99 : 3.912180

Reviewers: kradhakrishnan, rven, anthony, IslamAbdelRahman, MarkCallaghan, yhchiang

Reviewed By: yhchiang

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D43275
2015-08-05 13:02:33 -07:00

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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/compaction_job.h"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <algorithm>
#include <vector>
#include <memory>
#include <list>
#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/merge_helper.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/file_reader_writer.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/string_util.h"
#include "util/sync_point.h"
#include "util/thread_status_util.h"
namespace rocksdb {
struct CompactionJob::CompactionState {
Compaction* const compaction;
// Files produced by compaction
struct Output {
uint64_t number;
uint32_t path_id;
uint64_t file_size;
InternalKey smallest, largest;
SequenceNumber smallest_seqno, largest_seqno;
bool need_compaction;
};
std::vector<Output> outputs;
// State kept for output being generated
std::unique_ptr<WritableFileWriter> outfile;
std::unique_ptr<TableBuilder> builder;
uint64_t total_bytes;
Output* current_output() { return &outputs[outputs.size() - 1]; }
explicit CompactionState(Compaction* c)
: compaction(c),
total_bytes(0),
num_input_records(0),
num_output_records(0) {}
uint64_t num_input_records;
uint64_t num_output_records;
};
CompactionJob::CompactionJob(
int job_id, Compaction* compaction, const DBOptions& db_options,
const EnvOptions& env_options, VersionSet* versions,
std::atomic<bool>* shutting_down, LogBuffer* log_buffer,
Directory* db_directory, Directory* output_directory, Statistics* stats,
std::vector<SequenceNumber> existing_snapshots,
std::shared_ptr<Cache> table_cache, EventLogger* event_logger,
bool paranoid_file_checks, const std::string& dbname,
CompactionJobStats* compaction_job_stats)
: job_id_(job_id),
compact_(new CompactionState(compaction)),
compaction_job_stats_(compaction_job_stats),
compaction_stats_(1),
dbname_(dbname),
db_options_(db_options),
env_options_(env_options),
env_(db_options.env),
versions_(versions),
shutting_down_(shutting_down),
log_buffer_(log_buffer),
db_directory_(db_directory),
output_directory_(output_directory),
stats_(stats),
existing_snapshots_(std::move(existing_snapshots)),
table_cache_(std::move(table_cache)),
event_logger_(event_logger),
paranoid_file_checks_(paranoid_file_checks) {
assert(log_buffer_ != nullptr);
ThreadStatusUtil::SetColumnFamily(compact_->compaction->column_family_data());
ThreadStatusUtil::SetThreadOperation(ThreadStatus::OP_COMPACTION);
ReportStartedCompaction(compaction);
}
CompactionJob::~CompactionJob() {
assert(compact_ == nullptr);
ThreadStatusUtil::ResetThreadStatus();
}
void CompactionJob::ReportStartedCompaction(
Compaction* compaction) {
ThreadStatusUtil::SetColumnFamily(
compact_->compaction->column_family_data());
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_JOB_ID,
job_id_);
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_INPUT_OUTPUT_LEVEL,
(static_cast<uint64_t>(compact_->compaction->start_level()) << 32) +
compact_->compaction->output_level());
// In the current design, a CompactionJob is always created
// for non-trivial compaction.
assert(compaction->IsTrivialMove() == false ||
compaction->is_manual_compaction() == true);
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_PROP_FLAGS,
compaction->is_manual_compaction() +
(compaction->deletion_compaction() << 1));
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_TOTAL_INPUT_BYTES,
compaction->CalculateTotalInputSize());
IOSTATS_RESET(bytes_written);
IOSTATS_RESET(bytes_read);
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_BYTES_WRITTEN, 0);
ThreadStatusUtil::SetThreadOperationProperty(
ThreadStatus::COMPACTION_BYTES_READ, 0);
// Set the thread operation after operation properties
// to ensure GetThreadList() can always show them all together.
ThreadStatusUtil::SetThreadOperation(
ThreadStatus::OP_COMPACTION);
if (compaction_job_stats_) {
compaction_job_stats_->is_manual_compaction =
compaction->is_manual_compaction();
}
}
void CompactionJob::Prepare() {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_COMPACTION_PREPARE);
// Generate file_levels_ for compaction berfore making Iterator
ColumnFamilyData* cfd __attribute__((unused)) =
compact_->compaction->column_family_data();
assert(cfd != nullptr);
assert(cfd->current()->storage_info()->NumLevelFiles(
compact_->compaction->level()) > 0);
assert(compact_->builder == nullptr);
assert(!compact_->outfile);
visible_at_tip_ = 0;
latest_snapshot_ = 0;
if (existing_snapshots_.size() == 0) {
// optimize for fast path if there are no snapshots
visible_at_tip_ = versions_->LastSequence();
earliest_snapshot_ = visible_at_tip_;
} else {
latest_snapshot_ = existing_snapshots_.back();
// Add the current seqno as the 'latest' virtual
// snapshot to the end of this list.
existing_snapshots_.push_back(versions_->LastSequence());
earliest_snapshot_ = existing_snapshots_[0];
}
// Is this compaction producing files at the bottommost level?
bottommost_level_ = compact_->compaction->bottommost_level();
GetSubCompactionBoundaries();
}
// For L0-L1 compaction, iterators work in parallel by processing
// different subsets of the full key range. This function returns
// the Slices that designate the boundaries of these ranges. Now
// these boundaries are defined the key ranges of the files in L1,
// and the first and last entries are always nullptr (unrestricted)
void CompactionJob::GetSubCompactionBoundaries() {
auto* c = compact_->compaction;
auto& slices = sub_compaction_boundaries_;
if (c->IsSubCompaction()) {
// TODO(aekmekji): take the option num_subcompactions into account
// when dividing up the key range between multiple iterators instead
// of just assigning each iterator one L1 file's key range
for (size_t which = 0; which < c->num_input_levels(); which++) {
if (c->level(which) == 1) {
if (c->input_levels(which)->num_files > 1) {
const LevelFilesBrief* flevel = c->input_levels(which);
for (size_t i = 1; i < flevel->num_files; i++) {
slices.emplace_back(flevel->files[i].smallest_key);
}
}
break;
}
}
}
}
Status CompactionJob::Run() {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_COMPACTION_RUN);
TEST_SYNC_POINT("CompactionJob::Run():Start");
log_buffer_->FlushBufferToLog();
auto* compaction = compact_->compaction;
LogCompaction(compaction->column_family_data(), compaction);
Status status;
Slice *start, *end;
for (size_t i = 0; i < sub_compaction_boundaries_.size() + 1; i++) {
if (i == 0) {
start = nullptr;
} else {
start = &sub_compaction_boundaries_[i - 1];
}
if (i == sub_compaction_boundaries_.size()) {
end = nullptr;
} else {
end = &sub_compaction_boundaries_[i];
}
status = SubCompactionRun(start, end);
if (!status.ok()) {
break;
}
}
UpdateCompactionStats();
RecordCompactionIOStats();
LogFlush(db_options_.info_log);
TEST_SYNC_POINT("CompactionJob::Run():End");
return status;
}
Status CompactionJob::SubCompactionRun(Slice* start, Slice* end) {
auto* compaction = compact_->compaction;
const uint64_t start_micros = env_->NowMicros();
int64_t imm_micros = 0; // Micros spent doing imm_ compactions
std::unique_ptr<Iterator> input(versions_->MakeInputIterator(compaction));
Status status = ProcessKeyValueCompaction(&imm_micros, input.get(),
start, end);
input.reset();
if (output_directory_ && !db_options_.disableDataSync) {
output_directory_->Fsync();
}
compaction_stats_.micros = env_->NowMicros() - start_micros - imm_micros;
MeasureTime(stats_, COMPACTION_TIME, compaction_stats_.micros);
return status;
}
void CompactionJob::Install(Status* status,
const MutableCFOptions& mutable_cf_options,
InstrumentedMutex* db_mutex) {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_COMPACTION_INSTALL);
db_mutex->AssertHeld();
ColumnFamilyData* cfd = compact_->compaction->column_family_data();
cfd->internal_stats()->AddCompactionStats(
compact_->compaction->output_level(), compaction_stats_);
if (status->ok()) {
*status = InstallCompactionResults(db_mutex, mutable_cf_options);
}
VersionStorageInfo::LevelSummaryStorage tmp;
auto vstorage = cfd->current()->storage_info();
const auto& stats = compaction_stats_;
LogToBuffer(
log_buffer_,
"[%s] compacted to: %s, MB/sec: %.1f rd, %.1f wr, level %d, "
"files in(%d, %d) out(%d) "
"MB in(%.1f, %.1f) out(%.1f), read-write-amplify(%.1f) "
"write-amplify(%.1f) %s, records in: %d, records dropped: %d\n",
cfd->GetName().c_str(), vstorage->LevelSummary(&tmp),
(stats.bytes_read_non_output_levels + stats.bytes_read_output_level) /
static_cast<double>(stats.micros),
stats.bytes_written / static_cast<double>(stats.micros),
compact_->compaction->output_level(),
stats.num_input_files_in_non_output_levels,
stats.num_input_files_in_output_level,
stats.num_output_files,
stats.bytes_read_non_output_levels / 1048576.0,
stats.bytes_read_output_level / 1048576.0,
stats.bytes_written / 1048576.0,
(stats.bytes_written + stats.bytes_read_output_level +
stats.bytes_read_non_output_levels) /
static_cast<double>(stats.bytes_read_non_output_levels),
stats.bytes_written /
static_cast<double>(stats.bytes_read_non_output_levels),
status->ToString().c_str(), stats.num_input_records,
stats.num_dropped_records);
UpdateCompactionJobStats(stats);
auto stream = event_logger_->LogToBuffer(log_buffer_);
stream << "job" << job_id_ << "event"
<< "compaction_finished"
<< "output_level" << compact_->compaction->output_level()
<< "num_output_files" << compact_->outputs.size()
<< "total_output_size" << compact_->total_bytes
<< "num_input_records" << compact_->num_input_records
<< "num_output_records" << compact_->num_output_records;
stream << "lsm_state";
stream.StartArray();
for (int level = 0; level < vstorage->num_levels(); ++level) {
stream << vstorage->NumLevelFiles(level);
}
stream.EndArray();
CleanupCompaction(*status);
}
Status CompactionJob::ProcessKeyValueCompaction(int64_t* imm_micros,
Iterator* input,
Slice* start, Slice* end) {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_COMPACTION_PROCESS_KV);
Status status;
std::string compaction_filter_value;
ParsedInternalKey ikey;
IterKey current_user_key;
bool has_current_user_key = false;
IterKey delete_key;
SequenceNumber last_sequence_for_key __attribute__((unused)) =
kMaxSequenceNumber;
SequenceNumber visible_in_snapshot = kMaxSequenceNumber;
ColumnFamilyData* cfd = compact_->compaction->column_family_data();
MergeHelper merge(cfd->user_comparator(), cfd->ioptions()->merge_operator,
db_options_.info_log.get(),
cfd->ioptions()->min_partial_merge_operands,
false /* internal key corruption is expected */);
auto compaction_filter = cfd->ioptions()->compaction_filter;
std::unique_ptr<CompactionFilter> compaction_filter_from_factory = nullptr;
if (compaction_filter == nullptr) {
compaction_filter_from_factory =
compact_->compaction->CreateCompactionFilter();
compaction_filter = compaction_filter_from_factory.get();
}
TEST_SYNC_POINT("CompactionJob::Run():Inprogress");
int64_t key_drop_user = 0;
int64_t key_drop_newer_entry = 0;
int64_t key_drop_obsolete = 0;
int64_t loop_cnt = 0;
StopWatchNano timer(env_, stats_ != nullptr);
uint64_t total_filter_time = 0;
if (start != nullptr) {
IterKey start_iter;
start_iter.SetInternalKey(*start, kMaxSequenceNumber, kValueTypeForSeek);
Slice start_key = start_iter.GetKey();
input->Seek(start_key);
} else {
input->SeekToFirst();
}
// TODO(noetzli): check whether we could check !shutting_down_->... only
// only occasionally (see diff D42687)
while (input->Valid() && !shutting_down_->load(std::memory_order_acquire) &&
!cfd->IsDropped() && status.ok()) {
Slice key = input->key();
Slice value = input->value();
// First check that the key is parseable before performing the comparison
// to determine if it's within the range we want
if (!ParseInternalKey(key, &ikey)) {
// Do not hide error keys
// TODO: error key stays in db forever? Figure out the rationale
// v10 error v8 : we cannot hide v8 even though it's pretty obvious.
current_user_key.Clear();
has_current_user_key = false;
last_sequence_for_key = kMaxSequenceNumber;
visible_in_snapshot = kMaxSequenceNumber;
if (compaction_job_stats_ != nullptr) {
compaction_job_stats_->num_corrupt_keys++;
}
status = WriteKeyValue(key, value, ikey, input->status());
input->Next();
continue;
}
// If an end key is specified, check if the current key is >= than it
// and exit if it is because the iterator is out of the range desired
if (end != nullptr &&
cfd->user_comparator()->Compare(ikey.user_key, *end) >= 0) {
break;
}
compact_->num_input_records++;
if (++loop_cnt > 1000) {
RecordDroppedKeys(
&key_drop_user, &key_drop_newer_entry, &key_drop_obsolete);
RecordCompactionIOStats();
loop_cnt = 0;
}
if (compaction_job_stats_ != nullptr) {
compaction_job_stats_->total_input_raw_key_bytes += key.size();
compaction_job_stats_->total_input_raw_value_bytes += value.size();
}
if (compact_->compaction->ShouldStopBefore(key) &&
compact_->builder != nullptr) {
status = FinishCompactionOutputFile(input->status());
if (!status.ok()) {
break;
}
}
if (compaction_job_stats_ != nullptr && ikey.type == kTypeDeletion) {
compaction_job_stats_->num_input_deletion_records++;
}
if (!has_current_user_key ||
cfd->user_comparator()->Compare(ikey.user_key,
current_user_key.GetKey()) != 0) {
// First occurrence of this user key
current_user_key.SetKey(ikey.user_key);
has_current_user_key = true;
last_sequence_for_key = kMaxSequenceNumber;
visible_in_snapshot = kMaxSequenceNumber;
// apply the compaction filter to the first occurrence of the user key
if (compaction_filter && ikey.type == kTypeValue &&
(visible_at_tip_ || ikey.sequence > latest_snapshot_)) {
// If the user has specified a compaction filter and the sequence
// number is greater than any external snapshot, then invoke the
// filter.
// If the return value of the compaction filter is true, replace
// the entry with a delete marker.
bool value_changed = false;
compaction_filter_value.clear();
if (stats_ != nullptr) {
timer.Start();
}
bool to_delete = compaction_filter->Filter(
compact_->compaction->level(), ikey.user_key, value,
&compaction_filter_value, &value_changed);
total_filter_time += timer.ElapsedNanos();
if (to_delete) {
// make a copy of the original key and convert it to a delete
delete_key.SetInternalKey(ExtractUserKey(key), ikey.sequence,
kTypeDeletion);
// anchor the key again
key = delete_key.GetKey();
// needed because ikey is backed by key
ParseInternalKey(key, &ikey);
// no value associated with delete
value.clear();
++key_drop_user;
} else if (value_changed) {
value = compaction_filter_value;
}
}
}
// If there are no snapshots, then this kv affect visibility at tip.
// Otherwise, search though all existing snapshots to find
// the earlist snapshot that is affected by this kv.
SequenceNumber prev_snapshot = 0; // 0 means no previous snapshot
SequenceNumber visible =
visible_at_tip_
? visible_at_tip_
: findEarliestVisibleSnapshot(ikey.sequence, existing_snapshots_,
&prev_snapshot);
if (visible_in_snapshot == visible) {
// If the earliest snapshot is which this key is visible in
// is the same as the visibily of a previous instance of the
// same key, then this kv is not visible in any snapshot.
// Hidden by an newer entry for same user key
// TODO: why not > ?
assert(last_sequence_for_key >= ikey.sequence);
++key_drop_newer_entry;
input->Next(); // (A)
} else if (ikey.type == kTypeDeletion &&
ikey.sequence <= earliest_snapshot_ &&
compact_->compaction->KeyNotExistsBeyondOutputLevel(
ikey.user_key)) {
// For this user key:
// (1) there is no data in higher levels
// (2) data in lower levels will have larger sequence numbers
// (3) data in layers that are being compacted here and have
// smaller sequence numbers will be dropped in the next
// few iterations of this loop (by rule (A) above).
// Therefore this deletion marker is obsolete and can be dropped.
++key_drop_obsolete;
input->Next();
} else if (ikey.type == kTypeMerge) {
if (!merge.HasOperator()) {
LogToBuffer(log_buffer_, "Options::merge_operator is null.");
status = Status::InvalidArgument(
"merge_operator is not properly initialized.");
break;
}
// We know the merge type entry is not hidden, otherwise we would
// have hit (A)
// We encapsulate the merge related state machine in a different
// object to minimize change to the existing flow. Turn out this
// logic could also be nicely re-used for memtable flush purge
// optimization in BuildTable.
merge.MergeUntil(input, prev_snapshot, bottommost_level_,
db_options_.statistics.get(), env_);
if (merge.IsSuccess()) {
// Successfully found Put/Delete/(end-of-key-range) while merging
// Get the merge result
key = merge.key();
ParseInternalKey(key, &ikey);
status = WriteKeyValue(key, merge.value(), ikey, input->status());
} else {
// Did not find a Put/Delete/(end-of-key-range) while merging
// We now have some stack of merge operands to write out.
// NOTE: key,value, and ikey are now referring to old entries.
// These will be correctly set below.
const auto& keys = merge.keys();
const auto& values = merge.values();
assert(!keys.empty());
assert(keys.size() == values.size());
// We have a list of keys to write, write all keys in the list.
for (auto key_iter = keys.rbegin(), value_iter = values.rbegin();
!status.ok() || key_iter != keys.rend();
key_iter++, value_iter++) {
key = Slice(*key_iter);
value = Slice(*value_iter);
ParseInternalKey(key, &ikey);
status = WriteKeyValue(key, value, ikey, input->status());
}
}
} else {
status = WriteKeyValue(key, value, ikey, input->status());
input->Next();
}
last_sequence_for_key = ikey.sequence;
visible_in_snapshot = visible;
}
RecordTick(stats_, FILTER_OPERATION_TOTAL_TIME, total_filter_time);
RecordDroppedKeys(&key_drop_user, &key_drop_newer_entry, &key_drop_obsolete);
RecordCompactionIOStats();
if (status.ok() &&
(shutting_down_->load(std::memory_order_acquire) || cfd->IsDropped())) {
status = Status::ShutdownInProgress(
"Database shutdown or Column family drop during compaction");
}
if (status.ok() && compact_->builder != nullptr) {
status = FinishCompactionOutputFile(input->status());
}
if (status.ok()) {
status = input->status();
}
return status;
}
Status CompactionJob::WriteKeyValue(const Slice& key, const Slice& value,
const ParsedInternalKey& ikey, const Status& input_status) {
Slice newkey(key.data(), key.size());
std::string kstr;
// Zeroing out the sequence number leads to better compression.
// If this is the bottommost level (no files in lower levels)
// and the earliest snapshot is larger than this seqno
// then we can squash the seqno to zero.
if (bottommost_level_ && ikey.sequence < earliest_snapshot_ &&
ikey.type != kTypeMerge) {
assert(ikey.type != kTypeDeletion);
// make a copy because updating in place would cause problems
// with the priority queue that is managing the input key iterator
kstr.assign(key.data(), key.size());
UpdateInternalKey(&kstr, (uint64_t)0, ikey.type);
newkey = Slice(kstr);
}
// Open output file if necessary
if (compact_->builder == nullptr) {
Status status = OpenCompactionOutputFile();
if (!status.ok()) {
return status;
}
}
SequenceNumber seqno = GetInternalKeySeqno(newkey);
if (compact_->builder->NumEntries() == 0) {
compact_->current_output()->smallest.DecodeFrom(newkey);
compact_->current_output()->smallest_seqno = seqno;
} else {
compact_->current_output()->smallest_seqno =
std::min(compact_->current_output()->smallest_seqno, seqno);
}
compact_->current_output()->largest.DecodeFrom(newkey);
compact_->builder->Add(newkey, value);
compact_->num_output_records++;
compact_->current_output()->largest_seqno =
std::max(compact_->current_output()->largest_seqno, seqno);
// Close output file if it is big enough
Status status;
if (compact_->builder->FileSize() >=
compact_->compaction->max_output_file_size()) {
status = FinishCompactionOutputFile(input_status);
}
return status;
}
void CompactionJob::RecordDroppedKeys(
int64_t* key_drop_user,
int64_t* key_drop_newer_entry,
int64_t* key_drop_obsolete) {
if (*key_drop_user > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_USER, *key_drop_user);
*key_drop_user = 0;
}
if (*key_drop_newer_entry > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_NEWER_ENTRY, *key_drop_newer_entry);
if (compaction_job_stats_) {
compaction_job_stats_->num_records_replaced += *key_drop_newer_entry;
}
*key_drop_newer_entry = 0;
}
if (*key_drop_obsolete > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_OBSOLETE, *key_drop_obsolete);
if (compaction_job_stats_) {
compaction_job_stats_->num_expired_deletion_records
+= *key_drop_obsolete;
}
*key_drop_obsolete = 0;
}
}
Status CompactionJob::FinishCompactionOutputFile(const Status& input_status) {
AutoThreadOperationStageUpdater stage_updater(
ThreadStatus::STAGE_COMPACTION_SYNC_FILE);
assert(compact_ != nullptr);
assert(compact_->outfile);
assert(compact_->builder != nullptr);
const uint64_t output_number = compact_->current_output()->number;
const uint32_t output_path_id = compact_->current_output()->path_id;
assert(output_number != 0);
TableProperties table_properties;
// Check for iterator errors
Status s = input_status;
const uint64_t current_entries = compact_->builder->NumEntries();
compact_->current_output()->need_compaction =
compact_->builder->NeedCompact();
if (s.ok()) {
s = compact_->builder->Finish();
} else {
compact_->builder->Abandon();
}
const uint64_t current_bytes = compact_->builder->FileSize();
compact_->current_output()->file_size = current_bytes;
compact_->total_bytes += current_bytes;
// Finish and check for file errors
if (s.ok() && !db_options_.disableDataSync) {
StopWatch sw(env_, stats_, COMPACTION_OUTFILE_SYNC_MICROS);
s = compact_->outfile->Sync(db_options_.use_fsync);
}
if (s.ok()) {
s = compact_->outfile->Close();
}
compact_->outfile.reset();
if (s.ok() && current_entries > 0) {
// Verify that the table is usable
ColumnFamilyData* cfd = compact_->compaction->column_family_data();
FileDescriptor fd(output_number, output_path_id, current_bytes);
Iterator* iter = cfd->table_cache()->NewIterator(
ReadOptions(), env_options_, cfd->internal_comparator(), fd, nullptr,
true);
s = iter->status();
if (s.ok() && paranoid_file_checks_) {
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {}
s = iter->status();
}
delete iter;
if (s.ok()) {
TableFileCreationInfo info(compact_->builder->GetTableProperties());
info.db_name = dbname_;
info.cf_name = cfd->GetName();
info.file_path = TableFileName(cfd->ioptions()->db_paths,
fd.GetNumber(), fd.GetPathId());
info.file_size = fd.GetFileSize();
info.job_id = job_id_;
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Generated table #%" PRIu64 ": %" PRIu64
" keys, %" PRIu64 " bytes%s",
cfd->GetName().c_str(), job_id_, output_number, current_entries,
current_bytes,
compact_->current_output()->need_compaction ? " (need compaction)"
: "");
EventHelpers::LogAndNotifyTableFileCreation(
event_logger_, cfd->ioptions()->listeners, fd, info);
}
}
compact_->builder.reset();
return s;
}
Status CompactionJob::InstallCompactionResults(
InstrumentedMutex* db_mutex, const MutableCFOptions& mutable_cf_options) {
db_mutex->AssertHeld();
auto* compaction = compact_->compaction;
// paranoia: verify that the files that we started with
// still exist in the current version and in the same original level.
// This ensures that a concurrent compaction did not erroneously
// pick the same files to compact_.
if (!versions_->VerifyCompactionFileConsistency(compaction)) {
Compaction::InputLevelSummaryBuffer inputs_summary;
Log(InfoLogLevel::ERROR_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Compaction %s aborted",
compaction->column_family_data()->GetName().c_str(), job_id_,
compaction->InputLevelSummary(&inputs_summary));
return Status::Corruption("Compaction input files inconsistent");
}
{
Compaction::InputLevelSummaryBuffer inputs_summary;
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Compacted %s => %" PRIu64 " bytes",
compaction->column_family_data()->GetName().c_str(), job_id_,
compaction->InputLevelSummary(&inputs_summary), compact_->total_bytes);
}
// Add compaction outputs
compaction->AddInputDeletions(compact_->compaction->edit());
for (size_t i = 0; i < compact_->outputs.size(); i++) {
const CompactionState::Output& out = compact_->outputs[i];
compaction->edit()->AddFile(compaction->output_level(), out.number,
out.path_id, out.file_size, out.smallest,
out.largest, out.smallest_seqno,
out.largest_seqno, out.need_compaction);
}
return versions_->LogAndApply(compaction->column_family_data(),
mutable_cf_options, compaction->edit(),
db_mutex, db_directory_);
}
// Given a sequence number, return the sequence number of the
// earliest snapshot that this sequence number is visible in.
// The snapshots themselves are arranged in ascending order of
// sequence numbers.
// Employ a sequential search because the total number of
// snapshots are typically small.
inline SequenceNumber CompactionJob::findEarliestVisibleSnapshot(
SequenceNumber in, const std::vector<SequenceNumber>& snapshots,
SequenceNumber* prev_snapshot) {
assert(snapshots.size());
SequenceNumber prev __attribute__((unused)) = 0;
for (const auto cur : snapshots) {
assert(prev <= cur);
if (cur >= in) {
*prev_snapshot = prev;
return cur;
}
prev = cur; // assignment
assert(prev);
}
Log(InfoLogLevel::WARN_LEVEL, db_options_.info_log,
"CompactionJob is not able to find snapshot"
" with SeqId later than %" PRIu64
": current MaxSeqId is %" PRIu64 "",
in, snapshots[snapshots.size() - 1]);
assert(0);
return 0;
}
void CompactionJob::RecordCompactionIOStats() {
RecordTick(stats_, COMPACT_READ_BYTES, IOSTATS(bytes_read));
ThreadStatusUtil::IncreaseThreadOperationProperty(
ThreadStatus::COMPACTION_BYTES_READ, IOSTATS(bytes_read));
IOSTATS_RESET(bytes_read);
RecordTick(stats_, COMPACT_WRITE_BYTES, IOSTATS(bytes_written));
ThreadStatusUtil::IncreaseThreadOperationProperty(
ThreadStatus::COMPACTION_BYTES_WRITTEN, IOSTATS(bytes_written));
IOSTATS_RESET(bytes_written);
}
Status CompactionJob::OpenCompactionOutputFile() {
assert(compact_ != nullptr);
assert(compact_->builder == nullptr);
// no need to lock because VersionSet::next_file_number_ is atomic
uint64_t file_number = versions_->NewFileNumber();
// Make the output file
unique_ptr<WritableFile> writable_file;
std::string fname = TableFileName(db_options_.db_paths, file_number,
compact_->compaction->output_path_id());
Status s = env_->NewWritableFile(fname, &writable_file, env_options_);
if (!s.ok()) {
Log(InfoLogLevel::ERROR_LEVEL, db_options_.info_log,
"[%s] [JOB %d] OpenCompactionOutputFiles for table #%" PRIu64
" fails at NewWritableFile with status %s",
compact_->compaction->column_family_data()->GetName().c_str(), job_id_,
file_number, s.ToString().c_str());
LogFlush(db_options_.info_log);
return s;
}
CompactionState::Output out;
out.number = file_number;
out.path_id = compact_->compaction->output_path_id();
out.smallest.Clear();
out.largest.Clear();
out.smallest_seqno = out.largest_seqno = 0;
compact_->outputs.push_back(out);
writable_file->SetIOPriority(Env::IO_LOW);
writable_file->SetPreallocationBlockSize(
static_cast<size_t>(compact_->compaction->OutputFilePreallocationSize()));
compact_->outfile.reset(
new WritableFileWriter(std::move(writable_file), env_options_));
ColumnFamilyData* cfd = compact_->compaction->column_family_data();
bool skip_filters = false;
// If the Column family flag is to only optimize filters for hits,
// we can skip creating filters if this is the bottommost_level where
// data is going to be found
//
if (cfd->ioptions()->optimize_filters_for_hits && bottommost_level_) {
skip_filters = true;
}
compact_->builder.reset(NewTableBuilder(
*cfd->ioptions(), cfd->internal_comparator(),
cfd->int_tbl_prop_collector_factories(), compact_->outfile.get(),
compact_->compaction->output_compression(),
cfd->ioptions()->compression_opts, skip_filters));
LogFlush(db_options_.info_log);
return s;
}
void CompactionJob::CleanupCompaction(const Status& status) {
if (compact_->builder != nullptr) {
// May happen if we get a shutdown call in the middle of compaction
compact_->builder->Abandon();
compact_->builder.reset();
} else {
assert(!status.ok() || compact_->outfile == nullptr);
}
for (size_t i = 0; i < compact_->outputs.size(); i++) {
const CompactionState::Output& out = compact_->outputs[i];
// If this file was inserted into the table cache then remove
// them here because this compaction was not committed.
if (!status.ok()) {
TableCache::Evict(table_cache_.get(), out.number);
}
}
delete compact_;
compact_ = nullptr;
}
#ifndef ROCKSDB_LITE
namespace {
void CopyPrefix(
const Slice& src, size_t prefix_length, std::string* dst) {
assert(prefix_length > 0);
size_t length = src.size() > prefix_length ? prefix_length : src.size();
dst->assign(src.data(), length);
}
} // namespace
#endif // !ROCKSDB_LITE
void CompactionJob::UpdateCompactionStats() {
size_t num_output_files = compact_->outputs.size();
if (compact_->builder != nullptr) {
// An error occurred so ignore the last output.
assert(num_output_files > 0);
--num_output_files;
}
compaction_stats_.num_output_files = static_cast<int>(num_output_files);
Compaction* compaction = compact_->compaction;
compaction_stats_.num_input_files_in_non_output_levels = 0;
compaction_stats_.num_input_files_in_output_level = 0;
for (int input_level = 0;
input_level < static_cast<int>(compaction->num_input_levels());
++input_level) {
if (compaction->start_level() + input_level
!= compaction->output_level()) {
UpdateCompactionInputStatsHelper(
&compaction_stats_.num_input_files_in_non_output_levels,
&compaction_stats_.bytes_read_non_output_levels,
input_level);
} else {
UpdateCompactionInputStatsHelper(
&compaction_stats_.num_input_files_in_output_level,
&compaction_stats_.bytes_read_output_level,
input_level);
}
}
for (size_t i = 0; i < num_output_files; i++) {
compaction_stats_.bytes_written += compact_->outputs[i].file_size;
}
if (compact_->num_input_records > compact_->num_output_records) {
compaction_stats_.num_dropped_records +=
compact_->num_input_records - compact_->num_output_records;
}
}
void CompactionJob::UpdateCompactionInputStatsHelper(
int* num_files, uint64_t* bytes_read, int input_level) {
const Compaction* compaction = compact_->compaction;
auto num_input_files = compaction->num_input_files(input_level);
*num_files += static_cast<int>(num_input_files);
for (size_t i = 0; i < num_input_files; ++i) {
const auto* file_meta = compaction->input(input_level, i);
*bytes_read += file_meta->fd.GetFileSize();
compaction_stats_.num_input_records +=
static_cast<uint64_t>(file_meta->num_entries);
}
}
void CompactionJob::UpdateCompactionJobStats(
const InternalStats::CompactionStats& stats) const {
#ifndef ROCKSDB_LITE
if (compaction_job_stats_) {
compaction_job_stats_->elapsed_micros = stats.micros;
// input information
compaction_job_stats_->total_input_bytes =
stats.bytes_read_non_output_levels +
stats.bytes_read_output_level;
compaction_job_stats_->num_input_records =
compact_->num_input_records;
compaction_job_stats_->num_input_files =
stats.num_input_files_in_non_output_levels +
stats.num_input_files_in_output_level;
compaction_job_stats_->num_input_files_at_output_level =
stats.num_input_files_in_output_level;
// output information
compaction_job_stats_->total_output_bytes = stats.bytes_written;
compaction_job_stats_->num_output_records =
compact_->num_output_records;
compaction_job_stats_->num_output_files = stats.num_output_files;
if (compact_->outputs.size() > 0U) {
CopyPrefix(
compact_->outputs[0].smallest.user_key(),
CompactionJobStats::kMaxPrefixLength,
&compaction_job_stats_->smallest_output_key_prefix);
CopyPrefix(
compact_->current_output()->largest.user_key(),
CompactionJobStats::kMaxPrefixLength,
&compaction_job_stats_->largest_output_key_prefix);
}
}
#endif // !ROCKSDB_LITE
}
void CompactionJob::LogCompaction(
ColumnFamilyData* cfd, Compaction* compaction) {
// Let's check if anything will get logged. Don't prepare all the info if
// we're not logging
if (db_options_.info_log_level <= InfoLogLevel::INFO_LEVEL) {
Compaction::InputLevelSummaryBuffer inputs_summary;
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] [JOB %d] Compacting %s, score %.2f", cfd->GetName().c_str(),
job_id_, compaction->InputLevelSummary(&inputs_summary),
compaction->score());
char scratch[2345];
compaction->Summary(scratch, sizeof(scratch));
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"[%s] Compaction start summary: %s\n", cfd->GetName().c_str(), scratch);
// build event logger report
auto stream = event_logger_->Log();
stream << "job" << job_id_ << "event"
<< "compaction_started";
for (size_t i = 0; i < compaction->num_input_levels(); ++i) {
stream << ("files_L" + ToString(compaction->level(i)));
stream.StartArray();
for (auto f : *compaction->inputs(i)) {
stream << f->fd.GetNumber();
}
stream.EndArray();
}
stream << "score" << compaction->score() << "input_data_size"
<< compaction->CalculateTotalInputSize();
}
}
} // namespace rocksdb
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