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rocksdb/db/db_impl/db_impl_compaction_flush.cc
yuzhangyu@fb.com 1cfdece85d Run internal cpp modernizer on RocksDB repo (#12398) 
Summary:
When internal cpp modernizer attempts to format rocksdb code, it will replace macro `ROCKSDB_NAMESPACE`  with its default definition `rocksdb` when collapsing nested namespace. We filed a feedback for the tool T180254030 and the team filed a bug for this: https://github.com/llvm/llvm-project/issues/83452. At the same time, they suggested us to run the modernizer tool ourselves so future auto codemod attempts will be smaller. This diff contains:

Running
`xplat/scripts/codemod_service/cpp_modernizer.sh`
in fbcode/internal_repo_rocksdb/repo (excluding some directories in utilities/transactions/lock/range/range_tree/lib that has a non meta copyright comment)
without swapping out the namespace macro `ROCKSDB_NAMESPACE`

Followed by RocksDB's own
`make format`
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12398

Test Plan: Auto tests

Reviewed By: hx235

Differential Revision: D54382532

Pulled By: jowlyzhang

fbshipit-source-id: e7d5b40f9b113b60e5a503558c181f080b9d02fa
2024-03-04 10:08:32 -08:00

4369 lines
171 KiB
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <cinttypes>
#include <deque>
#include "db/builder.h"
#include "db/db_impl/db_impl.h"
#include "db/error_handler.h"
#include "db/event_helpers.h"
#include "file/sst_file_manager_impl.h"
#include "logging/logging.h"
#include "monitoring/iostats_context_imp.h"
#include "monitoring/perf_context_imp.h"
#include "monitoring/thread_status_updater.h"
#include "monitoring/thread_status_util.h"
#include "rocksdb/file_system.h"
#include "rocksdb/io_status.h"
#include "rocksdb/options.h"
#include "rocksdb/table.h"
#include "test_util/sync_point.h"
#include "util/cast_util.h"
#include "util/coding.h"
#include "util/concurrent_task_limiter_impl.h"
#include "util/udt_util.h"
namespace ROCKSDB_NAMESPACE {
bool DBImpl::EnoughRoomForCompaction(
ColumnFamilyData* cfd, const std::vector<CompactionInputFiles>& inputs,
bool* sfm_reserved_compact_space, LogBuffer* log_buffer) {
// Check if we have enough room to do the compaction
bool enough_room = true;
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
if (sfm) {
// Pass the current bg_error_ to SFM so it can decide what checks to
// perform. If this DB instance hasn't seen any error yet, the SFM can be
// optimistic and not do disk space checks
Status bg_error = error_handler_.GetBGError();
enough_room = sfm->EnoughRoomForCompaction(cfd, inputs, bg_error);
bg_error.PermitUncheckedError(); // bg_error is just a copy of the Status
// from the error_handler_
if (enough_room) {
*sfm_reserved_compact_space = true;
}
}
if (!enough_room) {
// Just in case tests want to change the value of enough_room
TEST_SYNC_POINT_CALLBACK(
"DBImpl::BackgroundCompaction():CancelledCompaction", &enough_room);
ROCKS_LOG_BUFFER(log_buffer,
"Cancelled compaction because not enough room");
RecordTick(stats_, COMPACTION_CANCELLED, 1);
}
return enough_room;
}
bool DBImpl::RequestCompactionToken(ColumnFamilyData* cfd, bool force,
std::unique_ptr<TaskLimiterToken>* token,
LogBuffer* log_buffer) {
assert(*token == nullptr);
auto limiter = static_cast<ConcurrentTaskLimiterImpl*>(
cfd->ioptions()->compaction_thread_limiter.get());
if (limiter == nullptr) {
return true;
}
*token = limiter->GetToken(force);
if (*token != nullptr) {
ROCKS_LOG_BUFFER(log_buffer,
"Thread limiter [%s] increase [%s] compaction task, "
"force: %s, tasks after: %d",
limiter->GetName().c_str(), cfd->GetName().c_str(),
force ? "true" : "false", limiter->GetOutstandingTask());
return true;
}
return false;
}
bool DBImpl::ShouldRescheduleFlushRequestToRetainUDT(
const FlushRequest& flush_req) {
mutex_.AssertHeld();
assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1);
ColumnFamilyData* cfd = flush_req.cfd_to_max_mem_id_to_persist.begin()->first;
uint64_t max_memtable_id =
flush_req.cfd_to_max_mem_id_to_persist.begin()->second;
if (cfd->IsDropped() ||
!cfd->ShouldPostponeFlushToRetainUDT(max_memtable_id)) {
return false;
}
// Check if holding on the flush will cause entering write stall mode.
// Write stall entered because of the accumulation of write buffers can be
// alleviated if we continue with the flush instead of postponing it.
const auto& mutable_cf_options = *cfd->GetLatestMutableCFOptions();
// Taking the status of the active Memtable into consideration so that we are
// not just checking if DB is currently already in write stall mode.
int mem_to_flush = cfd->mem()->ApproximateMemoryUsageFast() >=
cfd->mem()->write_buffer_size() / 2
? 1
: 0;
WriteStallCondition write_stall =
ColumnFamilyData::GetWriteStallConditionAndCause(
cfd->imm()->NumNotFlushed() + mem_to_flush, /*num_l0_files=*/0,
/*num_compaction_needed_bytes=*/0, mutable_cf_options,
*cfd->ioptions())
.first;
if (write_stall != WriteStallCondition::kNormal) {
return false;
}
return true;
}
IOStatus DBImpl::SyncClosedLogs(const WriteOptions& write_options,
JobContext* job_context,
VersionEdit* synced_wals,
bool error_recovery_in_prog) {
TEST_SYNC_POINT("DBImpl::SyncClosedLogs:Start");
InstrumentedMutexLock l(&log_write_mutex_);
autovector<log::Writer*, 1> logs_to_sync;
uint64_t current_log_number = logfile_number_;
while (logs_.front().number < current_log_number &&
logs_.front().IsSyncing()) {
log_sync_cv_.Wait();
}
for (auto it = logs_.begin();
it != logs_.end() && it->number < current_log_number; ++it) {
auto& log = *it;
log.PrepareForSync();
logs_to_sync.push_back(log.writer);
}
IOStatus io_s;
if (!logs_to_sync.empty()) {
log_write_mutex_.Unlock();
assert(job_context);
for (log::Writer* log : logs_to_sync) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[JOB %d] Syncing log #%" PRIu64, job_context->job_id,
log->get_log_number());
if (error_recovery_in_prog) {
log->file()->reset_seen_error();
}
IOOptions io_options;
io_s = WritableFileWriter::PrepareIOOptions(write_options, io_options);
if (!io_s.ok()) {
break;
}
io_s = log->file()->Sync(io_options, immutable_db_options_.use_fsync);
if (!io_s.ok()) {
break;
}
if (immutable_db_options_.recycle_log_file_num > 0) {
if (error_recovery_in_prog) {
log->file()->reset_seen_error();
}
// TODO: plumb Env::IOActivity, Env::IOPriority
io_s = log->Close(WriteOptions());
if (!io_s.ok()) {
break;
}
}
}
if (io_s.ok()) {
IOOptions io_options;
io_s = WritableFileWriter::PrepareIOOptions(write_options, io_options);
if (io_s.ok()) {
io_s = directories_.GetWalDir()->FsyncWithDirOptions(
io_options, nullptr,
DirFsyncOptions(DirFsyncOptions::FsyncReason::kNewFileSynced));
}
}
TEST_SYNC_POINT_CALLBACK("DBImpl::SyncClosedLogs:BeforeReLock",
/*arg=*/nullptr);
log_write_mutex_.Lock();
// "number <= current_log_number - 1" is equivalent to
// "number < current_log_number".
if (io_s.ok()) {
MarkLogsSynced(current_log_number - 1, true, synced_wals);
} else {
MarkLogsNotSynced(current_log_number - 1);
}
if (!io_s.ok()) {
TEST_SYNC_POINT("DBImpl::SyncClosedLogs:Failed");
return io_s;
}
}
TEST_SYNC_POINT("DBImpl::SyncClosedLogs:end");
return io_s;
}
Status DBImpl::FlushMemTableToOutputFile(
ColumnFamilyData* cfd, const MutableCFOptions& mutable_cf_options,
bool* made_progress, JobContext* job_context, FlushReason flush_reason,
SuperVersionContext* superversion_context,
std::vector<SequenceNumber>& snapshot_seqs,
SequenceNumber earliest_write_conflict_snapshot,
SnapshotChecker* snapshot_checker, LogBuffer* log_buffer,
Env::Priority thread_pri) {
mutex_.AssertHeld();
assert(cfd);
assert(cfd->imm());
assert(cfd->imm()->NumNotFlushed() != 0);
assert(cfd->imm()->IsFlushPending());
assert(versions_);
assert(versions_->GetColumnFamilySet());
const ReadOptions read_options(Env::IOActivity::kFlush);
const WriteOptions write_options(Env::IOActivity::kFlush);
// If there are more than one column families, we need to make sure that
// all the log files except the most recent one are synced. Otherwise if
// the host crashes after flushing and before WAL is persistent, the
// flushed SST may contain data from write batches whose updates to
// other (unflushed) column families are missing.
const bool needs_to_sync_closed_wals =
logfile_number_ > 0 &&
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() > 1;
// If needs_to_sync_closed_wals is true, we need to record the current
// maximum memtable ID of this column family so that a later PickMemtables()
// call will not pick memtables whose IDs are higher. This is due to the fact
// that SyncClosedLogs() may release the db mutex, and memtable switch can
// happen for this column family in the meantime. The newly created memtables
// have their data backed by unsynced WALs, thus they cannot be included in
// this flush job.
// Another reason why we must record the current maximum memtable ID of this
// column family: SyncClosedLogs() may release db mutex, thus it's possible
// for application to continue to insert into memtables increasing db's
// sequence number. The application may take a snapshot, but this snapshot is
// not included in `snapshot_seqs` which will be passed to flush job because
// `snapshot_seqs` has already been computed before this function starts.
// Recording the max memtable ID ensures that the flush job does not flush
// a memtable without knowing such snapshot(s).
uint64_t max_memtable_id =
needs_to_sync_closed_wals
? cfd->imm()->GetLatestMemTableID(false /* for_atomic_flush */)
: std::numeric_limits<uint64_t>::max();
// If needs_to_sync_closed_wals is false, then the flush job will pick ALL
// existing memtables of the column family when PickMemTable() is called
// later. Although we won't call SyncClosedLogs() in this case, we may still
// call the callbacks of the listeners, i.e. NotifyOnFlushBegin() which also
// releases and re-acquires the db mutex. In the meantime, the application
// can still insert into the memtables and increase the db's sequence number.
// The application can take a snapshot, hoping that the latest visible state
// to this snapshot is preserved. This is hard to guarantee since db mutex
// not held. This newly-created snapshot is not included in `snapshot_seqs`
// and the flush job is unaware of its presence. Consequently, the flush job
// may drop certain keys when generating the L0, causing incorrect data to be
// returned for snapshot read using this snapshot.
// To address this, we make sure NotifyOnFlushBegin() executes after memtable
// picking so that no new snapshot can be taken between the two functions.
FlushJob flush_job(
dbname_, cfd, immutable_db_options_, mutable_cf_options, max_memtable_id,
file_options_for_compaction_, versions_.get(), &mutex_, &shutting_down_,
snapshot_seqs, earliest_write_conflict_snapshot, snapshot_checker,
job_context, flush_reason, log_buffer, directories_.GetDbDir(),
GetDataDir(cfd, 0U),
GetCompressionFlush(*cfd->ioptions(), mutable_cf_options), stats_,
&event_logger_, mutable_cf_options.report_bg_io_stats,
true /* sync_output_directory */, true /* write_manifest */, thread_pri,
io_tracer_, seqno_to_time_mapping_, db_id_, db_session_id_,
cfd->GetFullHistoryTsLow(), &blob_callback_);
FileMetaData file_meta;
Status s;
bool need_cancel = false;
IOStatus log_io_s = IOStatus::OK();
if (needs_to_sync_closed_wals) {
// SyncClosedLogs() may unlock and re-lock the log_write_mutex multiple
// times.
VersionEdit synced_wals;
bool error_recovery_in_prog = error_handler_.IsRecoveryInProgress();
mutex_.Unlock();
log_io_s = SyncClosedLogs(write_options, job_context, &synced_wals,
error_recovery_in_prog);
mutex_.Lock();
if (log_io_s.ok() && synced_wals.IsWalAddition()) {
log_io_s = status_to_io_status(
ApplyWALToManifest(read_options, write_options, &synced_wals));
TEST_SYNC_POINT_CALLBACK("DBImpl::FlushMemTableToOutputFile:CommitWal:1",
nullptr);
}
if (!log_io_s.ok() && !log_io_s.IsShutdownInProgress() &&
!log_io_s.IsColumnFamilyDropped()) {
error_handler_.SetBGError(log_io_s, BackgroundErrorReason::kFlush);
}
} else {
TEST_SYNC_POINT("DBImpl::SyncClosedLogs:Skip");
}
s = log_io_s;
// If the log sync failed, we do not need to pick memtable. Otherwise,
// num_flush_not_started_ needs to be rollback.
TEST_SYNC_POINT("DBImpl::FlushMemTableToOutputFile:BeforePickMemtables");
// Exit a flush due to bg error should not set bg error again.
bool skip_set_bg_error = false;
if (s.ok() && !error_handler_.GetBGError().ok() &&
error_handler_.IsBGWorkStopped() &&
flush_reason != FlushReason::kErrorRecovery &&
flush_reason != FlushReason::kErrorRecoveryRetryFlush) {
// Error recovery in progress, should not pick memtable which excludes
// them from being picked up by recovery flush.
// This ensures that when bg error is set, no new flush can pick
// memtables.
skip_set_bg_error = true;
s = error_handler_.GetBGError();
assert(!s.ok());
ROCKS_LOG_BUFFER(log_buffer,
"[JOB %d] Skip flush due to background error %s",
job_context->job_id, s.ToString().c_str());
}
if (s.ok()) {
flush_job.PickMemTable();
need_cancel = true;
}
TEST_SYNC_POINT_CALLBACK(
"DBImpl::FlushMemTableToOutputFile:AfterPickMemtables", &flush_job);
// may temporarily unlock and lock the mutex.
NotifyOnFlushBegin(cfd, &file_meta, mutable_cf_options, job_context->job_id,
flush_reason);
bool switched_to_mempurge = false;
// Within flush_job.Run, rocksdb may call event listener to notify
// file creation and deletion.
//
// Note that flush_job.Run will unlock and lock the db_mutex,
// and EventListener callback will be called when the db_mutex
// is unlocked by the current thread.
if (s.ok()) {
s = flush_job.Run(&logs_with_prep_tracker_, &file_meta,
&switched_to_mempurge, &skip_set_bg_error,
&error_handler_);
need_cancel = false;
}
if (!s.ok() && need_cancel) {
flush_job.Cancel();
}
if (s.ok()) {
InstallSuperVersionAndScheduleWork(cfd, superversion_context,
mutable_cf_options);
if (made_progress) {
*made_progress = true;
}
const std::string& column_family_name = cfd->GetName();
Version* const current = cfd->current();
assert(current);
const VersionStorageInfo* const storage_info = current->storage_info();
assert(storage_info);
VersionStorageInfo::LevelSummaryStorage tmp;
ROCKS_LOG_BUFFER(log_buffer, "[%s] Level summary: %s\n",
column_family_name.c_str(),
storage_info->LevelSummary(&tmp));
const auto& blob_files = storage_info->GetBlobFiles();
if (!blob_files.empty()) {
assert(blob_files.front());
assert(blob_files.back());
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Blob file summary: head=%" PRIu64 ", tail=%" PRIu64 "\n",
column_family_name.c_str(), blob_files.front()->GetBlobFileNumber(),
blob_files.back()->GetBlobFileNumber());
}
}
if (!s.ok() && !s.IsShutdownInProgress() && !s.IsColumnFamilyDropped() &&
!skip_set_bg_error) {
if (log_io_s.ok()) {
// Error while writing to MANIFEST.
// In fact, versions_->io_status() can also be the result of renaming
// CURRENT file. With current code, it's just difficult to tell. So just
// be pessimistic and try write to a new MANIFEST.
// TODO: distinguish between MANIFEST write and CURRENT renaming
if (!versions_->io_status().ok()) {
// If WAL sync is successful (either WAL size is 0 or there is no IO
// error), all the Manifest write will be map to soft error.
// TODO: kManifestWriteNoWAL and kFlushNoWAL are misleading. Refactor is
// needed.
error_handler_.SetBGError(s,
BackgroundErrorReason::kManifestWriteNoWAL);
} else {
// If WAL sync is successful (either WAL size is 0 or there is no IO
// error), all the other SST file write errors will be set as
// kFlushNoWAL.
error_handler_.SetBGError(s, BackgroundErrorReason::kFlushNoWAL);
}
} else {
assert(s == log_io_s);
Status new_bg_error = s;
error_handler_.SetBGError(new_bg_error, BackgroundErrorReason::kFlush);
}
}
// If flush ran smoothly and no mempurge happened
// install new SST file path.
if (s.ok() && (!switched_to_mempurge)) {
// may temporarily unlock and lock the mutex.
NotifyOnFlushCompleted(cfd, mutable_cf_options,
flush_job.GetCommittedFlushJobsInfo());
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
if (sfm) {
// Notify sst_file_manager that a new file was added
std::string file_path = MakeTableFileName(
cfd->ioptions()->cf_paths[0].path, file_meta.fd.GetNumber());
// TODO (PR7798). We should only add the file to the FileManager if it
// exists. Otherwise, some tests may fail. Ignore the error in the
// interim.
sfm->OnAddFile(file_path).PermitUncheckedError();
if (sfm->IsMaxAllowedSpaceReached()) {
Status new_bg_error =
Status::SpaceLimit("Max allowed space was reached");
TEST_SYNC_POINT_CALLBACK(
"DBImpl::FlushMemTableToOutputFile:MaxAllowedSpaceReached",
&new_bg_error);
error_handler_.SetBGError(new_bg_error, BackgroundErrorReason::kFlush);
}
}
}
TEST_SYNC_POINT("DBImpl::FlushMemTableToOutputFile:Finish");
return s;
}
Status DBImpl::FlushMemTablesToOutputFiles(
const autovector<BGFlushArg>& bg_flush_args, bool* made_progress,
JobContext* job_context, LogBuffer* log_buffer, Env::Priority thread_pri) {
if (immutable_db_options_.atomic_flush) {
return AtomicFlushMemTablesToOutputFiles(
bg_flush_args, made_progress, job_context, log_buffer, thread_pri);
}
assert(bg_flush_args.size() == 1);
std::vector<SequenceNumber> snapshot_seqs;
SequenceNumber earliest_write_conflict_snapshot;
SnapshotChecker* snapshot_checker;
GetSnapshotContext(job_context, &snapshot_seqs,
&earliest_write_conflict_snapshot, &snapshot_checker);
const auto& bg_flush_arg = bg_flush_args[0];
ColumnFamilyData* cfd = bg_flush_arg.cfd_;
// intentional infrequent copy for each flush
MutableCFOptions mutable_cf_options_copy = *cfd->GetLatestMutableCFOptions();
SuperVersionContext* superversion_context =
bg_flush_arg.superversion_context_;
FlushReason flush_reason = bg_flush_arg.flush_reason_;
Status s = FlushMemTableToOutputFile(
cfd, mutable_cf_options_copy, made_progress, job_context, flush_reason,
superversion_context, snapshot_seqs, earliest_write_conflict_snapshot,
snapshot_checker, log_buffer, thread_pri);
return s;
}
/*
* Atomically flushes multiple column families.
*
* For each column family, all memtables with ID smaller than or equal to the
* ID specified in bg_flush_args will be flushed. Only after all column
* families finish flush will this function commit to MANIFEST. If any of the
* column families are not flushed successfully, this function does not have
* any side-effect on the state of the database.
*/
Status DBImpl::AtomicFlushMemTablesToOutputFiles(
const autovector<BGFlushArg>& bg_flush_args, bool* made_progress,
JobContext* job_context, LogBuffer* log_buffer, Env::Priority thread_pri) {
mutex_.AssertHeld();
const ReadOptions read_options(Env::IOActivity::kFlush);
const WriteOptions write_options(Env::IOActivity::kFlush);
autovector<ColumnFamilyData*> cfds;
for (const auto& arg : bg_flush_args) {
cfds.emplace_back(arg.cfd_);
}
#ifndef NDEBUG
for (const auto cfd : cfds) {
assert(cfd->imm()->NumNotFlushed() != 0);
assert(cfd->imm()->IsFlushPending());
}
for (const auto& bg_flush_arg : bg_flush_args) {
assert(bg_flush_arg.flush_reason_ == bg_flush_args[0].flush_reason_);
}
#endif /* !NDEBUG */
std::vector<SequenceNumber> snapshot_seqs;
SequenceNumber earliest_write_conflict_snapshot;
SnapshotChecker* snapshot_checker;
GetSnapshotContext(job_context, &snapshot_seqs,
&earliest_write_conflict_snapshot, &snapshot_checker);
autovector<FSDirectory*> distinct_output_dirs;
autovector<std::string> distinct_output_dir_paths;
std::vector<std::unique_ptr<FlushJob>> jobs;
std::vector<MutableCFOptions> all_mutable_cf_options;
int num_cfs = static_cast<int>(cfds.size());
all_mutable_cf_options.reserve(num_cfs);
for (int i = 0; i < num_cfs; ++i) {
auto cfd = cfds[i];
FSDirectory* data_dir = GetDataDir(cfd, 0U);
const std::string& curr_path = cfd->ioptions()->cf_paths[0].path;
// Add to distinct output directories if eligible. Use linear search. Since
// the number of elements in the vector is not large, performance should be
// tolerable.
bool found = false;
for (const auto& path : distinct_output_dir_paths) {
if (path == curr_path) {
found = true;
break;
}
}
if (!found) {
distinct_output_dir_paths.emplace_back(curr_path);
distinct_output_dirs.emplace_back(data_dir);
}
all_mutable_cf_options.emplace_back(*cfd->GetLatestMutableCFOptions());
const MutableCFOptions& mutable_cf_options = all_mutable_cf_options.back();
uint64_t max_memtable_id = bg_flush_args[i].max_memtable_id_;
FlushReason flush_reason = bg_flush_args[i].flush_reason_;
jobs.emplace_back(new FlushJob(
dbname_, cfd, immutable_db_options_, mutable_cf_options,
max_memtable_id, file_options_for_compaction_, versions_.get(), &mutex_,
&shutting_down_, snapshot_seqs, earliest_write_conflict_snapshot,
snapshot_checker, job_context, flush_reason, log_buffer,
directories_.GetDbDir(), data_dir,
GetCompressionFlush(*cfd->ioptions(), mutable_cf_options), stats_,
&event_logger_, mutable_cf_options.report_bg_io_stats,
false /* sync_output_directory */, false /* write_manifest */,
thread_pri, io_tracer_, seqno_to_time_mapping_, db_id_, db_session_id_,
cfd->GetFullHistoryTsLow(), &blob_callback_));
}
std::vector<FileMetaData> file_meta(num_cfs);
// Use of deque<bool> because vector<bool>
// is specific and doesn't allow &v[i].
std::deque<bool> switched_to_mempurge(num_cfs, false);
Status s;
IOStatus log_io_s = IOStatus::OK();
assert(num_cfs == static_cast<int>(jobs.size()));
for (int i = 0; i != num_cfs; ++i) {
const MutableCFOptions& mutable_cf_options = all_mutable_cf_options.at(i);
// may temporarily unlock and lock the mutex.
FlushReason flush_reason = bg_flush_args[i].flush_reason_;
NotifyOnFlushBegin(cfds[i], &file_meta[i], mutable_cf_options,
job_context->job_id, flush_reason);
}
if (logfile_number_ > 0) {
// TODO (yanqin) investigate whether we should sync the closed logs for
// single column family case.
VersionEdit synced_wals;
bool error_recovery_in_prog = error_handler_.IsRecoveryInProgress();
mutex_.Unlock();
log_io_s = SyncClosedLogs(write_options, job_context, &synced_wals,
error_recovery_in_prog);
mutex_.Lock();
if (log_io_s.ok() && synced_wals.IsWalAddition()) {
log_io_s = status_to_io_status(
ApplyWALToManifest(read_options, write_options, &synced_wals));
}
if (!log_io_s.ok() && !log_io_s.IsShutdownInProgress() &&
!log_io_s.IsColumnFamilyDropped()) {
if (total_log_size_ > 0) {
error_handler_.SetBGError(log_io_s, BackgroundErrorReason::kFlush);
} else {
// If the WAL is empty, we use different error reason
error_handler_.SetBGError(log_io_s, BackgroundErrorReason::kFlushNoWAL);
}
}
}
s = log_io_s;
// exec_status stores the execution status of flush_jobs as
// <bool /* executed */, Status /* status code */>
autovector<std::pair<bool, Status>> exec_status;
std::vector<bool> pick_status;
for (int i = 0; i != num_cfs; ++i) {
// Initially all jobs are not executed, with status OK.
exec_status.emplace_back(false, Status::OK());
pick_status.push_back(false);
}
bool flush_for_recovery =
bg_flush_args[0].flush_reason_ == FlushReason::kErrorRecovery ||
bg_flush_args[0].flush_reason_ == FlushReason::kErrorRecoveryRetryFlush;
bool skip_set_bg_error = false;
if (s.ok() && !error_handler_.GetBGError().ok() &&
error_handler_.IsBGWorkStopped() && !flush_for_recovery) {
s = error_handler_.GetBGError();
skip_set_bg_error = true;
assert(!s.ok());
ROCKS_LOG_BUFFER(log_buffer,
"[JOB %d] Skip flush due to background error %s",
job_context->job_id, s.ToString().c_str());
}
if (s.ok()) {
for (int i = 0; i != num_cfs; ++i) {
jobs[i]->PickMemTable();
pick_status[i] = true;
}
}
if (s.ok()) {
assert(switched_to_mempurge.size() ==
static_cast<long unsigned int>(num_cfs));
// TODO (yanqin): parallelize jobs with threads.
for (int i = 1; i != num_cfs; ++i) {
exec_status[i].second =
jobs[i]->Run(&logs_with_prep_tracker_, &file_meta[i],
&(switched_to_mempurge.at(i)));
exec_status[i].first = true;
}
if (num_cfs > 1) {
TEST_SYNC_POINT(
"DBImpl::AtomicFlushMemTablesToOutputFiles:SomeFlushJobsComplete:1");
TEST_SYNC_POINT(
"DBImpl::AtomicFlushMemTablesToOutputFiles:SomeFlushJobsComplete:2");
}
assert(exec_status.size() > 0);
assert(!file_meta.empty());
exec_status[0].second = jobs[0]->Run(
&logs_with_prep_tracker_, file_meta.data() /* &file_meta[0] */,
switched_to_mempurge.empty() ? nullptr : &(switched_to_mempurge.at(0)));
exec_status[0].first = true;
Status error_status;
for (const auto& e : exec_status) {
if (!e.second.ok()) {
s = e.second;
if (!e.second.IsShutdownInProgress() &&
!e.second.IsColumnFamilyDropped()) {
// If a flush job did not return OK, and the CF is not dropped, and
// the DB is not shutting down, then we have to return this result to
// caller later.
error_status = e.second;
}
}
}
s = error_status.ok() ? s : error_status;
}
if (s.IsColumnFamilyDropped()) {
s = Status::OK();
}
if (s.ok() || s.IsShutdownInProgress()) {
// Sync on all distinct output directories.
for (auto dir : distinct_output_dirs) {
if (dir != nullptr) {
IOOptions io_options;
Status error_status =
WritableFileWriter::PrepareIOOptions(write_options, io_options);
if (error_status.ok()) {
error_status = dir->FsyncWithDirOptions(
io_options, nullptr,
DirFsyncOptions(DirFsyncOptions::FsyncReason::kNewFileSynced));
}
if (!error_status.ok()) {
s = error_status;
break;
}
}
}
} else if (!skip_set_bg_error) {
// When `skip_set_bg_error` is true, no memtable is picked so
// there is no need to call Cancel() or RollbackMemtableFlush().
//
// Need to undo atomic flush if something went wrong, i.e. s is not OK and
// it is not because of CF drop.
// Have to cancel the flush jobs that have NOT executed because we need to
// unref the versions.
for (int i = 0; i != num_cfs; ++i) {
if (pick_status[i] && !exec_status[i].first) {
jobs[i]->Cancel();
}
}
for (int i = 0; i != num_cfs; ++i) {
if (exec_status[i].second.ok() && exec_status[i].first) {
auto& mems = jobs[i]->GetMemTables();
cfds[i]->imm()->RollbackMemtableFlush(
mems, /*rollback_succeeding_memtables=*/false);
}
}
}
if (s.ok()) {
const auto wait_to_install_func =
[&]() -> std::pair<Status, bool /*continue to wait*/> {
if (!versions_->io_status().ok()) {
// Something went wrong elsewhere, we cannot count on waiting for our
// turn to write/sync to MANIFEST or CURRENT. Just return.
return std::make_pair(versions_->io_status(), false);
} else if (shutting_down_.load(std::memory_order_acquire)) {
return std::make_pair(Status::ShutdownInProgress(), false);
}
bool ready = true;
for (size_t i = 0; i != cfds.size(); ++i) {
const auto& mems = jobs[i]->GetMemTables();
if (cfds[i]->IsDropped()) {
// If the column family is dropped, then do not wait.
continue;
} else if (!mems.empty() &&
cfds[i]->imm()->GetEarliestMemTableID() < mems[0]->GetID()) {
// If a flush job needs to install the flush result for mems and
// mems[0] is not the earliest memtable, it means another thread must
// be installing flush results for the same column family, then the
// current thread needs to wait.
ready = false;
break;
} else if (mems.empty() && cfds[i]->imm()->GetEarliestMemTableID() <=
bg_flush_args[i].max_memtable_id_) {
// If a flush job does not need to install flush results, then it has
// to wait until all memtables up to max_memtable_id_ (inclusive) are
// installed.
ready = false;
break;
}
}
return std::make_pair(Status::OK(), !ready);
};
bool resuming_from_bg_err =
error_handler_.IsDBStopped() || flush_for_recovery;
while ((!resuming_from_bg_err || error_handler_.GetRecoveryError().ok())) {
std::pair<Status, bool> res = wait_to_install_func();
TEST_SYNC_POINT_CALLBACK(
"DBImpl::AtomicFlushMemTablesToOutputFiles:WaitToCommit", &res);
if (!res.first.ok()) {
s = res.first;
break;
} else if (!res.second) {
// we are the oldest immutable memtable
break;
}
// We are not the oldest immutable memtable
TEST_SYNC_POINT_CALLBACK(
"DBImpl::AtomicFlushMemTablesToOutputFiles:WaitCV", &res);
//
// If bg work is stopped, recovery thread first calls
// WaitForBackgroundWork() before proceeding to flush for recovery. This
// flush can block WaitForBackgroundWork() while waiting for recovery
// flush to install result. To avoid this deadlock, we should abort here
// if there is background error.
if (!flush_for_recovery && error_handler_.IsBGWorkStopped() &&
!error_handler_.GetBGError().ok()) {
s = error_handler_.GetBGError();
assert(!s.ok());
break;
}
atomic_flush_install_cv_.Wait();
resuming_from_bg_err = error_handler_.IsDBStopped() || flush_for_recovery;
}
if (!resuming_from_bg_err) {
// If not resuming from bg err, then we determine future action based on
// whether we hit background error.
if (s.ok()) {
s = error_handler_.GetBGError();
}
} else if (s.ok()) {
// If resuming from bg err, we still rely on wait_to_install_func()'s
// result to determine future action. If wait_to_install_func() returns
// non-ok already, then we should not proceed to flush result
// installation.
s = error_handler_.GetRecoveryError();
}
// Since we are not installing these memtables, need to rollback
// to allow future flush job to pick up these memtables.
if (!s.ok()) {
for (int i = 0; i != num_cfs; ++i) {
assert(exec_status[i].first);
assert(exec_status[i].second.ok());
auto& mems = jobs[i]->GetMemTables();
cfds[i]->imm()->RollbackMemtableFlush(
mems, /*rollback_succeeding_memtables=*/false);
}
}
}
if (s.ok()) {
autovector<ColumnFamilyData*> tmp_cfds;
autovector<const autovector<MemTable*>*> mems_list;
autovector<const MutableCFOptions*> mutable_cf_options_list;
autovector<FileMetaData*> tmp_file_meta;
autovector<std::list<std::unique_ptr<FlushJobInfo>>*>
committed_flush_jobs_info;
for (int i = 0; i != num_cfs; ++i) {
const auto& mems = jobs[i]->GetMemTables();
if (!cfds[i]->IsDropped() && !mems.empty()) {
tmp_cfds.emplace_back(cfds[i]);
mems_list.emplace_back(&mems);
mutable_cf_options_list.emplace_back(&all_mutable_cf_options[i]);
tmp_file_meta.emplace_back(&file_meta[i]);
committed_flush_jobs_info.emplace_back(
jobs[i]->GetCommittedFlushJobsInfo());
}
}
s = InstallMemtableAtomicFlushResults(
nullptr /* imm_lists */, tmp_cfds, mutable_cf_options_list, mems_list,
versions_.get(), &logs_with_prep_tracker_, &mutex_, tmp_file_meta,
committed_flush_jobs_info, &job_context->memtables_to_free,
directories_.GetDbDir(), log_buffer);
}
if (s.ok()) {
assert(num_cfs ==
static_cast<int>(job_context->superversion_contexts.size()));
for (int i = 0; i != num_cfs; ++i) {
assert(cfds[i]);
if (cfds[i]->IsDropped()) {
continue;
}
InstallSuperVersionAndScheduleWork(cfds[i],
&job_context->superversion_contexts[i],
all_mutable_cf_options[i]);
const std::string& column_family_name = cfds[i]->GetName();
Version* const current = cfds[i]->current();
assert(current);
const VersionStorageInfo* const storage_info = current->storage_info();
assert(storage_info);
VersionStorageInfo::LevelSummaryStorage tmp;
ROCKS_LOG_BUFFER(log_buffer, "[%s] Level summary: %s\n",
column_family_name.c_str(),
storage_info->LevelSummary(&tmp));
const auto& blob_files = storage_info->GetBlobFiles();
if (!blob_files.empty()) {
assert(blob_files.front());
assert(blob_files.back());
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Blob file summary: head=%" PRIu64 ", tail=%" PRIu64 "\n",
column_family_name.c_str(), blob_files.front()->GetBlobFileNumber(),
blob_files.back()->GetBlobFileNumber());
}
}
if (made_progress) {
*made_progress = true;
}
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
assert(all_mutable_cf_options.size() == static_cast<size_t>(num_cfs));
for (int i = 0; s.ok() && i != num_cfs; ++i) {
// If mempurge happened instead of Flush,
// no NotifyOnFlushCompleted call (no SST file created).
if (switched_to_mempurge[i]) {
continue;
}
if (cfds[i]->IsDropped()) {
continue;
}
NotifyOnFlushCompleted(cfds[i], all_mutable_cf_options[i],
jobs[i]->GetCommittedFlushJobsInfo());
if (sfm) {
std::string file_path = MakeTableFileName(
cfds[i]->ioptions()->cf_paths[0].path, file_meta[i].fd.GetNumber());
// TODO (PR7798). We should only add the file to the FileManager if it
// exists. Otherwise, some tests may fail. Ignore the error in the
// interim.
sfm->OnAddFile(file_path).PermitUncheckedError();
if (sfm->IsMaxAllowedSpaceReached() &&
error_handler_.GetBGError().ok()) {
Status new_bg_error =
Status::SpaceLimit("Max allowed space was reached");
error_handler_.SetBGError(new_bg_error,
BackgroundErrorReason::kFlush);
}
}
}
}
// Need to undo atomic flush if something went wrong, i.e. s is not OK and
// it is not because of CF drop.
if (!s.ok() && !s.IsColumnFamilyDropped() && !skip_set_bg_error) {
if (log_io_s.ok()) {
// Error while writing to MANIFEST.
// In fact, versions_->io_status() can also be the result of renaming
// CURRENT file. With current code, it's just difficult to tell. So just
// be pessimistic and try write to a new MANIFEST.
// TODO: distinguish between MANIFEST write and CURRENT renaming
if (!versions_->io_status().ok()) {
// If WAL sync is successful (either WAL size is 0 or there is no IO
// error), all the Manifest write will be map to soft error.
// TODO: kManifestWriteNoWAL and kFlushNoWAL are misleading. Refactor
// is needed.
error_handler_.SetBGError(s,
BackgroundErrorReason::kManifestWriteNoWAL);
} else {
// If WAL sync is successful (either WAL size is 0 or there is no IO
// error), all the other SST file write errors will be set as
// kFlushNoWAL.
error_handler_.SetBGError(s, BackgroundErrorReason::kFlushNoWAL);
}
} else {
assert(s == log_io_s);
Status new_bg_error = s;
error_handler_.SetBGError(new_bg_error, BackgroundErrorReason::kFlush);
}
}
return s;
}
void DBImpl::NotifyOnFlushBegin(ColumnFamilyData* cfd, FileMetaData* file_meta,
const MutableCFOptions& mutable_cf_options,
int job_id, FlushReason flush_reason) {
if (immutable_db_options_.listeners.size() == 0U) {
return;
}
mutex_.AssertHeld();
if (shutting_down_.load(std::memory_order_acquire)) {
return;
}
bool triggered_writes_slowdown =
(cfd->current()->storage_info()->NumLevelFiles(0) >=
mutable_cf_options.level0_slowdown_writes_trigger);
bool triggered_writes_stop =
(cfd->current()->storage_info()->NumLevelFiles(0) >=
mutable_cf_options.level0_stop_writes_trigger);
// release lock while notifying events
mutex_.Unlock();
{
FlushJobInfo info{};
info.cf_id = cfd->GetID();
info.cf_name = cfd->GetName();
// TODO(yhchiang): make db_paths dynamic in case flush does not
// go to L0 in the future.
const uint64_t file_number = file_meta->fd.GetNumber();
info.file_path =
MakeTableFileName(cfd->ioptions()->cf_paths[0].path, file_number);
info.file_number = file_number;
info.thread_id = env_->GetThreadID();
info.job_id = job_id;
info.triggered_writes_slowdown = triggered_writes_slowdown;
info.triggered_writes_stop = triggered_writes_stop;
info.smallest_seqno = file_meta->fd.smallest_seqno;
info.largest_seqno = file_meta->fd.largest_seqno;
info.flush_reason = flush_reason;
for (const auto& listener : immutable_db_options_.listeners) {
listener->OnFlushBegin(this, info);
}
}
mutex_.Lock();
// no need to signal bg_cv_ as it will be signaled at the end of the
// flush process.
}
void DBImpl::NotifyOnFlushCompleted(
ColumnFamilyData* cfd, const MutableCFOptions& mutable_cf_options,
std::list<std::unique_ptr<FlushJobInfo>>* flush_jobs_info) {
assert(flush_jobs_info != nullptr);
if (immutable_db_options_.listeners.size() == 0U) {
return;
}
mutex_.AssertHeld();
if (shutting_down_.load(std::memory_order_acquire)) {
return;
}
bool triggered_writes_slowdown =
(cfd->current()->storage_info()->NumLevelFiles(0) >=
mutable_cf_options.level0_slowdown_writes_trigger);
bool triggered_writes_stop =
(cfd->current()->storage_info()->NumLevelFiles(0) >=
mutable_cf_options.level0_stop_writes_trigger);
// release lock while notifying events
mutex_.Unlock();
{
for (auto& info : *flush_jobs_info) {
info->triggered_writes_slowdown = triggered_writes_slowdown;
info->triggered_writes_stop = triggered_writes_stop;
for (const auto& listener : immutable_db_options_.listeners) {
listener->OnFlushCompleted(this, *info);
}
TEST_SYNC_POINT(
"DBImpl::NotifyOnFlushCompleted::PostAllOnFlushCompleted");
}
flush_jobs_info->clear();
}
mutex_.Lock();
// no need to signal bg_cv_ as it will be signaled at the end of the
// flush process.
}
Status DBImpl::CompactRange(const CompactRangeOptions& options,
ColumnFamilyHandle* column_family,
const Slice* begin_without_ts,
const Slice* end_without_ts) {
if (manual_compaction_paused_.load(std::memory_order_acquire) > 0) {
return Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
if (options.canceled && options.canceled->load(std::memory_order_acquire)) {
return Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
const Comparator* const ucmp = column_family->GetComparator();
assert(ucmp);
size_t ts_sz = ucmp->timestamp_size();
if (ts_sz == 0) {
return CompactRangeInternal(options, column_family, begin_without_ts,
end_without_ts, "" /*trim_ts*/);
}
std::string begin_str, end_str;
auto [begin, end] =
MaybeAddTimestampsToRange(begin_without_ts, end_without_ts, ts_sz,
&begin_str, &end_str, false /*exclusive_end*/);
return CompactRangeInternal(
options, column_family, begin.has_value() ? &begin.value() : nullptr,
end.has_value() ? &end.value() : nullptr, "" /*trim_ts*/);
}
Status DBImpl::IncreaseFullHistoryTsLow(ColumnFamilyHandle* column_family,
std::string ts_low) {
ColumnFamilyData* cfd = nullptr;
if (column_family == nullptr) {
cfd = default_cf_handle_->cfd();
} else {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(column_family);
assert(cfh != nullptr);
cfd = cfh->cfd();
}
assert(cfd != nullptr && cfd->user_comparator() != nullptr);
if (cfd->user_comparator()->timestamp_size() == 0) {
return Status::InvalidArgument(
"Timestamp is not enabled in this column family");
}
if (cfd->user_comparator()->timestamp_size() != ts_low.size()) {
return Status::InvalidArgument("ts_low size mismatch");
}
return IncreaseFullHistoryTsLowImpl(cfd, ts_low);
}
Status DBImpl::IncreaseFullHistoryTsLowImpl(ColumnFamilyData* cfd,
std::string ts_low) {
VersionEdit edit;
edit.SetColumnFamily(cfd->GetID());
edit.SetFullHistoryTsLow(ts_low);
// TODO: plumb Env::IOActivity, Env::IOPriority
const ReadOptions read_options;
const WriteOptions write_options;
TEST_SYNC_POINT_CALLBACK("DBImpl::IncreaseFullHistoryTsLowImpl:BeforeEdit",
&edit);
InstrumentedMutexLock l(&mutex_);
std::string current_ts_low = cfd->GetFullHistoryTsLow();
const Comparator* ucmp = cfd->user_comparator();
assert(ucmp->timestamp_size() == ts_low.size() && !ts_low.empty());
if (!current_ts_low.empty() &&
ucmp->CompareTimestamp(ts_low, current_ts_low) < 0) {
return Status::InvalidArgument("Cannot decrease full_history_ts_low");
}
Status s = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
read_options, write_options, &edit, &mutex_,
directories_.GetDbDir());
if (!s.ok()) {
return s;
}
current_ts_low = cfd->GetFullHistoryTsLow();
if (!current_ts_low.empty() &&
ucmp->CompareTimestamp(current_ts_low, ts_low) > 0) {
std::stringstream oss;
oss << "full_history_ts_low: " << Slice(current_ts_low).ToString(true)
<< " is set to be higher than the requested "
"timestamp: "
<< Slice(ts_low).ToString(true) << std::endl;
return Status::TryAgain(oss.str());
}
return Status::OK();
}
Status DBImpl::CompactRangeInternal(const CompactRangeOptions& options,
ColumnFamilyHandle* column_family,
const Slice* begin, const Slice* end,
const std::string& trim_ts) {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(column_family);
auto cfd = cfh->cfd();
if (options.target_path_id >= cfd->ioptions()->cf_paths.size()) {
return Status::InvalidArgument("Invalid target path ID");
}
bool flush_needed = true;
// Update full_history_ts_low if it's set
if (options.full_history_ts_low != nullptr &&
!options.full_history_ts_low->empty()) {
std::string ts_low = options.full_history_ts_low->ToString();
if (begin != nullptr || end != nullptr) {
return Status::InvalidArgument(
"Cannot specify compaction range with full_history_ts_low");
}
Status s = IncreaseFullHistoryTsLowImpl(cfd, ts_low);
if (!s.ok()) {
LogFlush(immutable_db_options_.info_log);
return s;
}
}
Status s;
if (begin != nullptr && end != nullptr) {
// TODO(ajkr): We could also optimize away the flush in certain cases where
// one/both sides of the interval are unbounded. But it requires more
// changes to RangesOverlapWithMemtables.
UserKeyRange range(*begin, *end);
SuperVersion* super_version = cfd->GetReferencedSuperVersion(this);
s = cfd->RangesOverlapWithMemtables(
{range}, super_version, immutable_db_options_.allow_data_in_errors,
&flush_needed);
CleanupSuperVersion(super_version);
}
if (s.ok() && flush_needed) {
FlushOptions fo;
fo.allow_write_stall = options.allow_write_stall;
if (immutable_db_options_.atomic_flush) {
s = AtomicFlushMemTables(fo, FlushReason::kManualCompaction);
} else {
s = FlushMemTable(cfd, fo, FlushReason::kManualCompaction);
}
if (!s.ok()) {
LogFlush(immutable_db_options_.info_log);
return s;
}
}
constexpr int kInvalidLevel = -1;
int final_output_level = kInvalidLevel;
bool exclusive = options.exclusive_manual_compaction;
if (cfd->ioptions()->compaction_style == kCompactionStyleUniversal &&
cfd->NumberLevels() > 1) {
// Always compact all files together.
final_output_level = cfd->NumberLevels() - 1;
// if bottom most level is reserved
if (immutable_db_options_.allow_ingest_behind) {
final_output_level--;
}
s = RunManualCompaction(cfd, ColumnFamilyData::kCompactAllLevels,
final_output_level, options, begin, end, exclusive,
false /* disable_trivial_move */,
std::numeric_limits<uint64_t>::max(), trim_ts);
} else {
int first_overlapped_level = kInvalidLevel;
{
SuperVersion* super_version = cfd->GetReferencedSuperVersion(this);
Version* current_version = super_version->current;
// Might need to query the partitioner
SstPartitionerFactory* partitioner_factory =
current_version->cfd()->ioptions()->sst_partitioner_factory.get();
std::unique_ptr<SstPartitioner> partitioner;
if (partitioner_factory && begin != nullptr && end != nullptr) {
SstPartitioner::Context context;
context.is_full_compaction = false;
context.is_manual_compaction = true;
context.output_level = /*unknown*/ -1;
// Small lies about compaction range
context.smallest_user_key = *begin;
context.largest_user_key = *end;
partitioner = partitioner_factory->CreatePartitioner(context);
}
ReadOptions ro;
ro.total_order_seek = true;
ro.io_activity = Env::IOActivity::kCompaction;
bool overlap;
for (int level = 0;
level < current_version->storage_info()->num_non_empty_levels();
level++) {
overlap = true;
// Whether to look at specific keys within files for overlap with
// compaction range, other than largest and smallest keys of the file
// known in Version metadata.
bool check_overlap_within_file = false;
if (begin != nullptr && end != nullptr) {
// Typically checking overlap within files in this case
check_overlap_within_file = true;
// WART: Not known why we don't check within file in one-sided bound
// cases
if (partitioner) {
// Especially if the partitioner is new, the manual compaction
// might be used to enforce the partitioning. Checking overlap
// within files might miss cases where compaction is needed to
// partition the files, as in this example:
// * File has two keys "001" and "111"
// * Compaction range is ["011", "101")
// * Partition boundary at "100"
// In cases like this, file-level overlap with the compaction
// range is sufficient to force any partitioning that is needed
// within the compaction range.
//
// But if there's no partitioning boundary within the compaction
// range, we can be sure there's no need to fix partitioning
// within that range, thus safe to check overlap within file.
//
// Use a hypothetical trivial move query to check for partition
// boundary in range. (NOTE: in defiance of all conventions,
// `begin` and `end` here are both INCLUSIVE bounds, which makes
// this analogy to CanDoTrivialMove() accurate even when `end` is
// the first key in a partition.)
if (!partitioner->CanDoTrivialMove(*begin, *end)) {
check_overlap_within_file = false;
}
}
}
if (check_overlap_within_file) {
Status status = current_version->OverlapWithLevelIterator(
ro, file_options_, *begin, *end, level, &overlap);
if (!status.ok()) {
check_overlap_within_file = false;
}
}
if (!check_overlap_within_file) {
overlap = current_version->storage_info()->OverlapInLevel(level,
begin, end);
}
if (overlap) {
first_overlapped_level = level;
break;
}
}
CleanupSuperVersion(super_version);
}
if (s.ok() && first_overlapped_level != kInvalidLevel) {
if (cfd->ioptions()->compaction_style == kCompactionStyleUniversal ||
cfd->ioptions()->compaction_style == kCompactionStyleFIFO) {
assert(first_overlapped_level == 0);
s = RunManualCompaction(
cfd, first_overlapped_level, first_overlapped_level, options, begin,
end, exclusive, true /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /* max_file_num_to_ignore */,
trim_ts);
final_output_level = first_overlapped_level;
} else {
assert(cfd->ioptions()->compaction_style == kCompactionStyleLevel);
uint64_t next_file_number = versions_->current_next_file_number();
// Start compaction from `first_overlapped_level`, one level down at a
// time, until output level >= max_overlapped_level.
// When max_overlapped_level == 0, we will still compact from L0 -> L1
// (or LBase), and followed by a bottommost level intra-level compaction
// at L1 (or LBase), if applicable.
int level = first_overlapped_level;
final_output_level = level;
int output_level = 0, base_level = 0;
for (;;) {
// Always allow L0 -> L1 compaction
if (level > 0) {
if (cfd->ioptions()->level_compaction_dynamic_level_bytes) {
assert(final_output_level < cfd->ioptions()->num_levels);
if (final_output_level + 1 == cfd->ioptions()->num_levels) {
break;
}
} else {
// TODO(cbi): there is still a race condition here where
// if a background compaction compacts some file beyond
// current()->storage_info()->num_non_empty_levels() right after
// the check here.This should happen very infrequently and should
// not happen once a user populates the last level of the LSM.
InstrumentedMutexLock l(&mutex_);
// num_non_empty_levels may be lower after a compaction, so
// we check for >= here.
if (final_output_level + 1 >=
cfd->current()->storage_info()->num_non_empty_levels()) {
break;
}
}
}
output_level = level + 1;
if (cfd->ioptions()->level_compaction_dynamic_level_bytes &&
level == 0) {
output_level = ColumnFamilyData::kCompactToBaseLevel;
}
// Use max value for `max_file_num_to_ignore` to always compact
// files down.
s = RunManualCompaction(
cfd, level, output_level, options, begin, end, exclusive,
!trim_ts.empty() /* disallow_trivial_move */,
std::numeric_limits<uint64_t>::max() /* max_file_num_to_ignore */,
trim_ts,
output_level == ColumnFamilyData::kCompactToBaseLevel
? &base_level
: nullptr);
if (!s.ok()) {
break;
}
if (output_level == ColumnFamilyData::kCompactToBaseLevel) {
assert(base_level > 0);
level = base_level;
} else {
++level;
}
final_output_level = level;
TEST_SYNC_POINT("DBImpl::RunManualCompaction()::1");
TEST_SYNC_POINT("DBImpl::RunManualCompaction()::2");
}
if (s.ok()) {
assert(final_output_level > 0);
// bottommost level intra-level compaction
if ((options.bottommost_level_compaction ==
BottommostLevelCompaction::kIfHaveCompactionFilter &&
(cfd->ioptions()->compaction_filter != nullptr ||
cfd->ioptions()->compaction_filter_factory != nullptr)) ||
options.bottommost_level_compaction ==
BottommostLevelCompaction::kForceOptimized ||
options.bottommost_level_compaction ==
BottommostLevelCompaction::kForce) {
// Use `next_file_number` as `max_file_num_to_ignore` to avoid
// rewriting newly compacted files when it is kForceOptimized
// or kIfHaveCompactionFilter with compaction filter set.
s = RunManualCompaction(
cfd, final_output_level, final_output_level, options, begin,
end, exclusive, true /* disallow_trivial_move */,
next_file_number /* max_file_num_to_ignore */, trim_ts);
}
}
}
}
}
if (!s.ok() || final_output_level == kInvalidLevel) {
LogFlush(immutable_db_options_.info_log);
return s;
}
if (options.change_level) {
TEST_SYNC_POINT("DBImpl::CompactRange:BeforeRefit:1");
TEST_SYNC_POINT("DBImpl::CompactRange:BeforeRefit:2");
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[RefitLevel] waiting for background threads to stop");
// TODO(hx235): remove `Enable/DisableManualCompaction` and
// `Continue/PauseBackgroundWork` once we ensure registering RefitLevel()'s
// range is sufficient (if not, what else is needed) for avoiding range
// conflicts with other activities (e.g, compaction, flush) that are
// currently avoided by `Enable/DisableManualCompaction` and
// `Continue/PauseBackgroundWork`.
DisableManualCompaction();
s = PauseBackgroundWork();
if (s.ok()) {
TEST_SYNC_POINT("DBImpl::CompactRange:PreRefitLevel");
s = ReFitLevel(cfd, final_output_level, options.target_level);
TEST_SYNC_POINT("DBImpl::CompactRange:PostRefitLevel");
// ContinueBackgroundWork always return Status::OK().
Status temp_s = ContinueBackgroundWork();
assert(temp_s.ok());
}
EnableManualCompaction();
TEST_SYNC_POINT(
"DBImpl::CompactRange:PostRefitLevel:ManualCompactionEnabled");
}
LogFlush(immutable_db_options_.info_log);
{
InstrumentedMutexLock l(&mutex_);
// an automatic compaction that has been scheduled might have been
// preempted by the manual compactions. Need to schedule it back.
MaybeScheduleFlushOrCompaction();
}
return s;
}
Status DBImpl::CompactFiles(const CompactionOptions& compact_options,
ColumnFamilyHandle* column_family,
const std::vector<std::string>& input_file_names,
const int output_level, const int output_path_id,
std::vector<std::string>* const output_file_names,
CompactionJobInfo* compaction_job_info) {
if (column_family == nullptr) {
return Status::InvalidArgument("ColumnFamilyHandle must be non-null.");
}
auto cfd =
static_cast_with_check<ColumnFamilyHandleImpl>(column_family)->cfd();
assert(cfd);
Status s;
JobContext job_context(next_job_id_.fetch_add(1), true);
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL,
immutable_db_options_.info_log.get());
// Perform CompactFiles
TEST_SYNC_POINT("TestCompactFiles::IngestExternalFile2");
TEST_SYNC_POINT_CALLBACK("TestCompactFiles:PausingManualCompaction:3",
static_cast<void*>(const_cast<std::atomic<int>*>(
&manual_compaction_paused_)));
{
InstrumentedMutexLock l(&mutex_);
auto* current = cfd->current();
current->Ref();
s = CompactFilesImpl(compact_options, cfd, current, input_file_names,
output_file_names, output_level, output_path_id,
&job_context, &log_buffer, compaction_job_info);
current->Unref();
}
// Find and delete obsolete files
{
InstrumentedMutexLock l(&mutex_);
// If !s.ok(), this means that Compaction failed. In that case, we want
// to delete all obsolete files we might have created and we force
// FindObsoleteFiles(). This is because job_context does not
// catch all created files if compaction failed.
FindObsoleteFiles(&job_context, !s.ok());
} // release the mutex
// delete unnecessary files if any, this is done outside the mutex
if (job_context.HaveSomethingToClean() ||
job_context.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
// Have to flush the info logs before bg_compaction_scheduled_--
// because if bg_flush_scheduled_ becomes 0 and the lock is
// released, the deconstructor of DB can kick in and destroy all the
// states of DB so info_log might not be available after that point.
// It also applies to access other states that DB owns.
log_buffer.FlushBufferToLog();
if (job_context.HaveSomethingToDelete()) {
// no mutex is locked here. No need to Unlock() and Lock() here.
PurgeObsoleteFiles(job_context);
}
job_context.Clean();
}
return s;
}
Status DBImpl::CompactFilesImpl(
const CompactionOptions& compact_options, ColumnFamilyData* cfd,
Version* version, const std::vector<std::string>& input_file_names,
std::vector<std::string>* const output_file_names, const int output_level,
int output_path_id, JobContext* job_context, LogBuffer* log_buffer,
CompactionJobInfo* compaction_job_info) {
mutex_.AssertHeld();
if (shutting_down_.load(std::memory_order_acquire)) {
return Status::ShutdownInProgress();
}
if (manual_compaction_paused_.load(std::memory_order_acquire) > 0) {
return Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
std::unordered_set<uint64_t> input_set;
for (const auto& file_name : input_file_names) {
input_set.insert(TableFileNameToNumber(file_name));
}
ColumnFamilyMetaData cf_meta;
// TODO(yhchiang): can directly use version here if none of the
// following functions call is pluggable to external developers.
version->GetColumnFamilyMetaData(&cf_meta);
if (output_path_id < 0) {
if (cfd->ioptions()->cf_paths.size() == 1U) {
output_path_id = 0;
} else {
return Status::NotSupported(
"Automatic output path selection is not "
"yet supported in CompactFiles()");
}
}
if (cfd->ioptions()->allow_ingest_behind &&
output_level >= cfd->ioptions()->num_levels - 1) {
return Status::InvalidArgument(
"Exceed the maximum output level defined by "
"the current compaction algorithm with ingest_behind --- " +
std::to_string(cfd->ioptions()->num_levels - 1));
}
Status s = cfd->compaction_picker()->SanitizeCompactionInputFiles(
&input_set, cf_meta, output_level);
TEST_SYNC_POINT("DBImpl::CompactFilesImpl::PostSanitizeCompactionInputFiles");
if (!s.ok()) {
return s;
}
std::vector<CompactionInputFiles> input_files;
s = cfd->compaction_picker()->GetCompactionInputsFromFileNumbers(
&input_files, &input_set, version->storage_info(), compact_options);
if (!s.ok()) {
return s;
}
for (const auto& inputs : input_files) {
if (cfd->compaction_picker()->AreFilesInCompaction(inputs.files)) {
return Status::Aborted(
"Some of the necessary compaction input "
"files are already being compacted");
}
}
bool sfm_reserved_compact_space = false;
// First check if we have enough room to do the compaction
bool enough_room = EnoughRoomForCompaction(
cfd, input_files, &sfm_reserved_compact_space, log_buffer);
if (!enough_room) {
// m's vars will get set properly at the end of this function,
// as long as status == CompactionTooLarge
return Status::CompactionTooLarge();
}
// At this point, CompactFiles will be run.
bg_compaction_scheduled_++;
std::unique_ptr<Compaction> c;
assert(cfd->compaction_picker());
c.reset(cfd->compaction_picker()->CompactFiles(
compact_options, input_files, output_level, version->storage_info(),
*cfd->GetLatestMutableCFOptions(), mutable_db_options_, output_path_id));
// we already sanitized the set of input files and checked for conflicts
// without releasing the lock, so we're guaranteed a compaction can be formed.
assert(c != nullptr);
c->FinalizeInputInfo(version);
// deletion compaction currently not allowed in CompactFiles.
assert(!c->deletion_compaction());
std::vector<SequenceNumber> snapshot_seqs;
SequenceNumber earliest_write_conflict_snapshot;
SnapshotChecker* snapshot_checker;
GetSnapshotContext(job_context, &snapshot_seqs,
&earliest_write_conflict_snapshot, &snapshot_checker);
std::unique_ptr<std::list<uint64_t>::iterator> pending_outputs_inserted_elem(
new std::list<uint64_t>::iterator(
CaptureCurrentFileNumberInPendingOutputs()));
assert(is_snapshot_supported_ || snapshots_.empty());
CompactionJobStats compaction_job_stats;
CompactionJob compaction_job(
job_context->job_id, c.get(), immutable_db_options_, mutable_db_options_,
file_options_for_compaction_, versions_.get(), &shutting_down_,
log_buffer, directories_.GetDbDir(),
GetDataDir(c->column_family_data(), c->output_path_id()),
GetDataDir(c->column_family_data(), 0), stats_, &mutex_, &error_handler_,
snapshot_seqs, earliest_write_conflict_snapshot, snapshot_checker,
job_context, table_cache_, &event_logger_,
c->mutable_cf_options()->paranoid_file_checks,
c->mutable_cf_options()->report_bg_io_stats, dbname_,
&compaction_job_stats, Env::Priority::USER, io_tracer_,
kManualCompactionCanceledFalse_, db_id_, db_session_id_,
c->column_family_data()->GetFullHistoryTsLow(), c->trim_ts(),
&blob_callback_, &bg_compaction_scheduled_,
&bg_bottom_compaction_scheduled_);
// Creating a compaction influences the compaction score because the score
// takes running compactions into account (by skipping files that are already
// being compacted). Since we just changed compaction score, we recalculate it
// here.
version->storage_info()->ComputeCompactionScore(*cfd->ioptions(),
*c->mutable_cf_options());
compaction_job.Prepare();
mutex_.Unlock();
TEST_SYNC_POINT("CompactFilesImpl:0");
TEST_SYNC_POINT("CompactFilesImpl:1");
// Ignore the status here, as it will be checked in the Install down below...
compaction_job.Run().PermitUncheckedError();
TEST_SYNC_POINT("CompactFilesImpl:2");
TEST_SYNC_POINT("CompactFilesImpl:3");
mutex_.Lock();
bool compaction_released = false;
Status status =
compaction_job.Install(*c->mutable_cf_options(), &compaction_released);
if (!compaction_released) {
c->ReleaseCompactionFiles(s);
}
if (status.ok()) {
assert(compaction_job.io_status().ok());
InstallSuperVersionAndScheduleWork(
c->column_family_data(), job_context->superversion_contexts.data(),
*c->mutable_cf_options());
}
// status above captures any error during compaction_job.Install, so its ok
// not check compaction_job.io_status() explicitly if we're not calling
// SetBGError
compaction_job.io_status().PermitUncheckedError();
// Need to make sure SstFileManager does its bookkeeping
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
if (sfm && sfm_reserved_compact_space) {
sfm->OnCompactionCompletion(c.get());
}
ReleaseFileNumberFromPendingOutputs(pending_outputs_inserted_elem);
if (compaction_job_info != nullptr) {
BuildCompactionJobInfo(cfd, c.get(), s, compaction_job_stats,
job_context->job_id, compaction_job_info);
}
if (status.ok()) {
// Done
} else if (status.IsColumnFamilyDropped() || status.IsShutdownInProgress()) {
// Ignore compaction errors found during shutting down
} else if (status.IsManualCompactionPaused()) {
// Don't report stopping manual compaction as error
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[%s] [JOB %d] Stopping manual compaction",
c->column_family_data()->GetName().c_str(),
job_context->job_id);
} else {
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"[%s] [JOB %d] Compaction error: %s",
c->column_family_data()->GetName().c_str(),
job_context->job_id, status.ToString().c_str());
IOStatus io_s = compaction_job.io_status();
if (!io_s.ok()) {
error_handler_.SetBGError(io_s, BackgroundErrorReason::kCompaction);
} else {
error_handler_.SetBGError(status, BackgroundErrorReason::kCompaction);
}
}
if (output_file_names != nullptr) {
for (const auto& newf : c->edit()->GetNewFiles()) {
output_file_names->push_back(TableFileName(
c->immutable_options()->cf_paths, newf.second.fd.GetNumber(),
newf.second.fd.GetPathId()));
}
for (const auto& blob_file : c->edit()->GetBlobFileAdditions()) {
output_file_names->push_back(
BlobFileName(c->immutable_options()->cf_paths.front().path,
blob_file.GetBlobFileNumber()));
}
}
c.reset();
bg_compaction_scheduled_--;
if (bg_compaction_scheduled_ == 0) {
bg_cv_.SignalAll();
}
MaybeScheduleFlushOrCompaction();
TEST_SYNC_POINT("CompactFilesImpl:End");
return status;
}
Status DBImpl::PauseBackgroundWork() {
InstrumentedMutexLock guard_lock(&mutex_);
bg_compaction_paused_++;
while (bg_bottom_compaction_scheduled_ > 0 || bg_compaction_scheduled_ > 0 ||
bg_flush_scheduled_ > 0) {
bg_cv_.Wait();
}
bg_work_paused_++;
return Status::OK();
}
Status DBImpl::ContinueBackgroundWork() {
InstrumentedMutexLock guard_lock(&mutex_);
if (bg_work_paused_ == 0) {
return Status::InvalidArgument("Background work already unpaused");
}
assert(bg_work_paused_ > 0);
assert(bg_compaction_paused_ > 0);
bg_compaction_paused_--;
bg_work_paused_--;
// It's sufficient to check just bg_work_paused_ here since
// bg_work_paused_ is always no greater than bg_compaction_paused_
if (bg_work_paused_ == 0) {
MaybeScheduleFlushOrCompaction();
}
return Status::OK();
}
void DBImpl::NotifyOnCompactionBegin(ColumnFamilyData* cfd, Compaction* c,
const Status& st,
const CompactionJobStats& job_stats,
int job_id) {
if (immutable_db_options_.listeners.empty()) {
return;
}
mutex_.AssertHeld();
if (shutting_down_.load(std::memory_order_acquire)) {
return;
}
if (c->is_manual_compaction() &&
manual_compaction_paused_.load(std::memory_order_acquire) > 0) {
return;
}
c->SetNotifyOnCompactionCompleted();
// release lock while notifying events
mutex_.Unlock();
TEST_SYNC_POINT("DBImpl::NotifyOnCompactionBegin::UnlockMutex");
{
CompactionJobInfo info{};
BuildCompactionJobInfo(cfd, c, st, job_stats, job_id, &info);
for (const auto& listener : immutable_db_options_.listeners) {
listener->OnCompactionBegin(this, info);
}
info.status.PermitUncheckedError();
}
mutex_.Lock();
}
void DBImpl::NotifyOnCompactionCompleted(
ColumnFamilyData* cfd, Compaction* c, const Status& st,
const CompactionJobStats& compaction_job_stats, const int job_id) {
if (immutable_db_options_.listeners.size() == 0U) {
return;
}
mutex_.AssertHeld();
if (shutting_down_.load(std::memory_order_acquire)) {
return;
}
if (c->ShouldNotifyOnCompactionCompleted() == false) {
return;
}
// release lock while notifying events
mutex_.Unlock();
TEST_SYNC_POINT("DBImpl::NotifyOnCompactionCompleted::UnlockMutex");
{
CompactionJobInfo info{};
BuildCompactionJobInfo(cfd, c, st, compaction_job_stats, job_id, &info);
for (const auto& listener : immutable_db_options_.listeners) {
listener->OnCompactionCompleted(this, info);
}
}
mutex_.Lock();
// no need to signal bg_cv_ as it will be signaled at the end of the
// flush process.
}
// REQUIREMENT: block all background work by calling PauseBackgroundWork()
// before calling this function
Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
assert(level < cfd->NumberLevels());
if (target_level >= cfd->NumberLevels()) {
return Status::InvalidArgument("Target level exceeds number of levels");
}
const ReadOptions read_options(Env::IOActivity::kCompaction);
const WriteOptions write_options(Env::IOActivity::kCompaction);
SuperVersionContext sv_context(/* create_superversion */ true);
InstrumentedMutexLock guard_lock(&mutex_);
auto* vstorage = cfd->current()->storage_info();
if (vstorage->LevelFiles(level).empty()) {
return Status::OK();
}
// only allow one thread refitting
if (refitting_level_) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[ReFitLevel] another thread is refitting");
return Status::NotSupported("another thread is refitting");
}
refitting_level_ = true;
const MutableCFOptions mutable_cf_options = *cfd->GetLatestMutableCFOptions();
// move to a smaller level
int to_level = target_level;
if (target_level < 0) {
to_level = FindMinimumEmptyLevelFitting(cfd, mutable_cf_options, level);
}
if (to_level != level) {
std::vector<CompactionInputFiles> input(1);
input[0].level = level;
for (auto& f : vstorage->LevelFiles(level)) {
input[0].files.push_back(f);
}
InternalKey refit_level_smallest;
InternalKey refit_level_largest;
cfd->compaction_picker()->GetRange(input[0], &refit_level_smallest,
&refit_level_largest);
if (to_level > level) {
if (level == 0) {
refitting_level_ = false;
return Status::NotSupported(
"Cannot change from level 0 to other levels.");
}
// Check levels are empty for a trivial move
for (int l = level + 1; l <= to_level; l++) {
if (vstorage->NumLevelFiles(l) > 0) {
refitting_level_ = false;
return Status::NotSupported(
"Levels between source and target are not empty for a move.");
}
if (cfd->RangeOverlapWithCompaction(refit_level_smallest.user_key(),
refit_level_largest.user_key(),
l)) {
refitting_level_ = false;
return Status::NotSupported(
"Levels between source and target "
"will have some ongoing compaction's output.");
}
}
} else {
// to_level < level
// Check levels are empty for a trivial move
for (int l = to_level; l < level; l++) {
if (vstorage->NumLevelFiles(l) > 0) {
refitting_level_ = false;
return Status::NotSupported(
"Levels between source and target are not empty for a move.");
}
if (cfd->RangeOverlapWithCompaction(refit_level_smallest.user_key(),
refit_level_largest.user_key(),
l)) {
refitting_level_ = false;
return Status::NotSupported(
"Levels between source and target "
"will have some ongoing compaction's output.");
}
}
}
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] Before refitting:\n%s", cfd->GetName().c_str(),
cfd->current()->DebugString().data());
std::unique_ptr<Compaction> c(new Compaction(
vstorage, *cfd->ioptions(), mutable_cf_options, mutable_db_options_,
{input}, to_level,
MaxFileSizeForLevel(
mutable_cf_options, to_level,
cfd->ioptions()
->compaction_style) /* output file size limit, not applicable */
,
LLONG_MAX /* max compaction bytes, not applicable */,
0 /* output path ID, not applicable */, mutable_cf_options.compression,
mutable_cf_options.compression_opts,
mutable_cf_options.default_write_temperature,
0 /* max_subcompactions, not applicable */,
{} /* grandparents, not applicable */, false /* is manual */,
"" /* trim_ts */, -1 /* score, not applicable */,
false /* is deletion compaction, not applicable */,
false /* l0_files_might_overlap, not applicable */,
CompactionReason::kRefitLevel));
cfd->compaction_picker()->RegisterCompaction(c.get());
TEST_SYNC_POINT("DBImpl::ReFitLevel:PostRegisterCompaction");
VersionEdit edit;
edit.SetColumnFamily(cfd->GetID());
for (const auto& f : vstorage->LevelFiles(level)) {
edit.DeleteFile(level, f->fd.GetNumber());
edit.AddFile(
to_level, f->fd.GetNumber(), f->fd.GetPathId(), f->fd.GetFileSize(),
f->smallest, f->largest, f->fd.smallest_seqno, f->fd.largest_seqno,
f->marked_for_compaction, f->temperature, f->oldest_blob_file_number,
f->oldest_ancester_time, f->file_creation_time, f->epoch_number,
f->file_checksum, f->file_checksum_func_name, f->unique_id,
f->compensated_range_deletion_size, f->tail_size,
f->user_defined_timestamps_persisted);
}
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] Apply version edit:\n%s", cfd->GetName().c_str(),
edit.DebugString().data());
Status status = versions_->LogAndApply(cfd, mutable_cf_options,
read_options, write_options, &edit,
&mutex_, directories_.GetDbDir());
cfd->compaction_picker()->UnregisterCompaction(c.get());
c.reset();
InstallSuperVersionAndScheduleWork(cfd, &sv_context, mutable_cf_options);
ROCKS_LOG_DEBUG(immutable_db_options_.info_log, "[%s] LogAndApply: %s\n",
cfd->GetName().c_str(), status.ToString().data());
if (status.ok()) {
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] After refitting:\n%s", cfd->GetName().c_str(),
cfd->current()->DebugString().data());
}
sv_context.Clean();
refitting_level_ = false;
return status;
}
refitting_level_ = false;
return Status::OK();
}
int DBImpl::NumberLevels(ColumnFamilyHandle* column_family) {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(column_family);
return cfh->cfd()->NumberLevels();
}
int DBImpl::MaxMemCompactionLevel(ColumnFamilyHandle* /*column_family*/) {
return 0;
}
int DBImpl::Level0StopWriteTrigger(ColumnFamilyHandle* column_family) {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(column_family);
InstrumentedMutexLock l(&mutex_);
return cfh->cfd()
->GetSuperVersion()
->mutable_cf_options.level0_stop_writes_trigger;
}
Status DBImpl::FlushAllColumnFamilies(const FlushOptions& flush_options,
FlushReason flush_reason) {
mutex_.AssertHeld();
Status status;
if (immutable_db_options_.atomic_flush) {
mutex_.Unlock();
status = AtomicFlushMemTables(flush_options, flush_reason);
if (status.IsColumnFamilyDropped()) {
status = Status::OK();
}
mutex_.Lock();
} else {
for (auto cfd : versions_->GetRefedColumnFamilySet()) {
if (cfd->IsDropped()) {
continue;
}
mutex_.Unlock();
status = FlushMemTable(cfd, flush_options, flush_reason);
TEST_SYNC_POINT("DBImpl::FlushAllColumnFamilies:1");
TEST_SYNC_POINT("DBImpl::FlushAllColumnFamilies:2");
mutex_.Lock();
if (!status.ok() && !status.IsColumnFamilyDropped()) {
break;
} else if (status.IsColumnFamilyDropped()) {
status = Status::OK();
}
}
}
return status;
}
Status DBImpl::Flush(const FlushOptions& flush_options,
ColumnFamilyHandle* column_family) {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(column_family);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "[%s] Manual flush start.",
cfh->GetName().c_str());
Status s;
if (immutable_db_options_.atomic_flush) {
s = AtomicFlushMemTables(flush_options, FlushReason::kManualFlush,
{cfh->cfd()});
} else {
s = FlushMemTable(cfh->cfd(), flush_options, FlushReason::kManualFlush);
}
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[%s] Manual flush finished, status: %s\n",
cfh->GetName().c_str(), s.ToString().c_str());
return s;
}
Status DBImpl::Flush(const FlushOptions& flush_options,
const std::vector<ColumnFamilyHandle*>& column_families) {
Status s;
if (!immutable_db_options_.atomic_flush) {
for (auto cfh : column_families) {
s = Flush(flush_options, cfh);
if (!s.ok()) {
break;
}
}
} else {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Manual atomic flush start.\n"
"=====Column families:=====");
for (auto cfh : column_families) {
auto cfhi = static_cast<ColumnFamilyHandleImpl*>(cfh);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "%s",
cfhi->GetName().c_str());
}
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"=====End of column families list=====");
autovector<ColumnFamilyData*> cfds;
std::for_each(column_families.begin(), column_families.end(),
[&cfds](ColumnFamilyHandle* elem) {
auto cfh = static_cast<ColumnFamilyHandleImpl*>(elem);
cfds.emplace_back(cfh->cfd());
});
s = AtomicFlushMemTables(flush_options, FlushReason::kManualFlush, cfds);
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Manual atomic flush finished, status: %s\n"
"=====Column families:=====",
s.ToString().c_str());
for (auto cfh : column_families) {
auto cfhi = static_cast<ColumnFamilyHandleImpl*>(cfh);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "%s",
cfhi->GetName().c_str());
}
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"=====End of column families list=====");
}
return s;
}
Status DBImpl::RunManualCompaction(
ColumnFamilyData* cfd, int input_level, int output_level,
const CompactRangeOptions& compact_range_options, const Slice* begin,
const Slice* end, bool exclusive, bool disallow_trivial_move,
uint64_t max_file_num_to_ignore, const std::string& trim_ts,
int* final_output_level) {
assert(input_level == ColumnFamilyData::kCompactAllLevels ||
input_level >= 0);
InternalKey begin_storage, end_storage;
CompactionArg* ca = nullptr;
bool scheduled = false;
bool unscheduled = false;
Env::Priority thread_pool_priority = Env::Priority::TOTAL;
bool manual_conflict = false;
ManualCompactionState manual(
cfd, input_level, output_level, compact_range_options.target_path_id,
exclusive, disallow_trivial_move, compact_range_options.canceled);
// For universal compaction, we enforce every manual compaction to compact
// all files.
if (begin == nullptr ||
cfd->ioptions()->compaction_style == kCompactionStyleUniversal ||
cfd->ioptions()->compaction_style == kCompactionStyleFIFO) {
manual.begin = nullptr;
} else {
begin_storage.SetMinPossibleForUserKey(*begin);
manual.begin = &begin_storage;
}
if (end == nullptr ||
cfd->ioptions()->compaction_style == kCompactionStyleUniversal ||
cfd->ioptions()->compaction_style == kCompactionStyleFIFO) {
manual.end = nullptr;
} else {
end_storage.SetMaxPossibleForUserKey(*end);
manual.end = &end_storage;
}
TEST_SYNC_POINT("DBImpl::RunManualCompaction:0");
TEST_SYNC_POINT("DBImpl::RunManualCompaction:1");
InstrumentedMutexLock l(&mutex_);
if (manual_compaction_paused_ > 0) {
// Does not make sense to `AddManualCompaction()` in this scenario since
// `DisableManualCompaction()` just waited for the manual compaction queue
// to drain. So return immediately.
TEST_SYNC_POINT("DBImpl::RunManualCompaction:PausedAtStart");
manual.status =
Status::Incomplete(Status::SubCode::kManualCompactionPaused);
manual.done = true;
return manual.status;
}
// When a manual compaction arrives, temporarily disable scheduling of
// non-manual compactions and wait until the number of scheduled compaction
// jobs drops to zero. This used to be needed to ensure that this manual
// compaction can compact any range of keys/files. Now it is optional
// (see `CompactRangeOptions::exclusive_manual_compaction`). The use case for
// `exclusive_manual_compaction=true` is unclear beyond not trusting the code.
//
// HasPendingManualCompaction() is true when at least one thread is inside
// RunManualCompaction(), i.e. during that time no other compaction will
// get scheduled (see MaybeScheduleFlushOrCompaction).
//
// Note that the following loop doesn't stop more that one thread calling
// RunManualCompaction() from getting to the second while loop below.
// However, only one of them will actually schedule compaction, while
// others will wait on a condition variable until it completes.
AddManualCompaction(&manual);
TEST_SYNC_POINT_CALLBACK("DBImpl::RunManualCompaction:NotScheduled", &mutex_);
if (exclusive) {
// Limitation: there's no way to wake up the below loop when user sets
// `*manual.canceled`. So `CompactRangeOptions::exclusive_manual_compaction`
// and `CompactRangeOptions::canceled` might not work well together.
while (bg_bottom_compaction_scheduled_ > 0 ||
bg_compaction_scheduled_ > 0) {
if (manual_compaction_paused_ > 0 || manual.canceled == true) {
// Pretend the error came from compaction so the below cleanup/error
// handling code can process it.
manual.done = true;
manual.status =
Status::Incomplete(Status::SubCode::kManualCompactionPaused);
break;
}
TEST_SYNC_POINT("DBImpl::RunManualCompaction:WaitScheduled");
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"[%s] Manual compaction waiting for all other scheduled background "
"compactions to finish",
cfd->GetName().c_str());
bg_cv_.Wait();
}
}
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL,
immutable_db_options_.info_log.get());
ROCKS_LOG_BUFFER(&log_buffer, "[%s] Manual compaction starting",
cfd->GetName().c_str());
// We don't check bg_error_ here, because if we get the error in compaction,
// the compaction will set manual.status to bg_error_ and set manual.done to
// true.
while (!manual.done) {
assert(HasPendingManualCompaction());
manual_conflict = false;
Compaction* compaction = nullptr;
if (ShouldntRunManualCompaction(&manual) || (manual.in_progress == true) ||
scheduled ||
(((manual.manual_end = &manual.tmp_storage1) != nullptr) &&
((compaction = manual.cfd->CompactRange(
*manual.cfd->GetLatestMutableCFOptions(), mutable_db_options_,
manual.input_level, manual.output_level, compact_range_options,
manual.begin, manual.end, &manual.manual_end, &manual_conflict,
max_file_num_to_ignore, trim_ts)) == nullptr &&
manual_conflict))) {
if (!scheduled) {
// There is a conflicting compaction
if (manual_compaction_paused_ > 0 || manual.canceled == true) {
// Stop waiting since it was canceled. Pretend the error came from
// compaction so the below cleanup/error handling code can process it.
manual.done = true;
manual.status =
Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
}
if (!manual.done) {
bg_cv_.Wait();
}
if (manual_compaction_paused_ > 0 && scheduled && !unscheduled) {
assert(thread_pool_priority != Env::Priority::TOTAL);
// unschedule all manual compactions
auto unscheduled_task_num = env_->UnSchedule(
GetTaskTag(TaskType::kManualCompaction), thread_pool_priority);
if (unscheduled_task_num > 0) {
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"[%s] Unscheduled %d number of manual compactions from the "
"thread-pool",
cfd->GetName().c_str(), unscheduled_task_num);
// it may unschedule other manual compactions, notify others.
bg_cv_.SignalAll();
}
unscheduled = true;
TEST_SYNC_POINT("DBImpl::RunManualCompaction:Unscheduled");
}
if (scheduled && manual.incomplete == true) {
assert(!manual.in_progress);
scheduled = false;
manual.incomplete = false;
}
} else if (!scheduled) {
if (compaction == nullptr) {
manual.done = true;
if (final_output_level) {
// No compaction needed or there is a conflicting compaction.
// Still set `final_output_level` to the level where we would
// have compacted to.
*final_output_level = output_level;
if (output_level == ColumnFamilyData::kCompactToBaseLevel) {
*final_output_level = cfd->current()->storage_info()->base_level();
}
}
bg_cv_.SignalAll();
continue;
}
ca = new CompactionArg;
ca->db = this;
ca->prepicked_compaction = new PrepickedCompaction;
ca->prepicked_compaction->manual_compaction_state = &manual;
ca->prepicked_compaction->compaction = compaction;
if (!RequestCompactionToken(
cfd, true, &ca->prepicked_compaction->task_token, &log_buffer)) {
// Don't throttle manual compaction, only count outstanding tasks.
assert(false);
}
manual.incomplete = false;
if (compaction->bottommost_level() &&
env_->GetBackgroundThreads(Env::Priority::BOTTOM) > 0) {
bg_bottom_compaction_scheduled_++;
ca->compaction_pri_ = Env::Priority::BOTTOM;
env_->Schedule(&DBImpl::BGWorkBottomCompaction, ca,
Env::Priority::BOTTOM,
GetTaskTag(TaskType::kManualCompaction),
&DBImpl::UnscheduleCompactionCallback);
thread_pool_priority = Env::Priority::BOTTOM;
} else {
bg_compaction_scheduled_++;
ca->compaction_pri_ = Env::Priority::LOW;
env_->Schedule(&DBImpl::BGWorkCompaction, ca, Env::Priority::LOW,
GetTaskTag(TaskType::kManualCompaction),
&DBImpl::UnscheduleCompactionCallback);
thread_pool_priority = Env::Priority::LOW;
}
scheduled = true;
TEST_SYNC_POINT("DBImpl::RunManualCompaction:Scheduled");
if (final_output_level) {
*final_output_level = compaction->output_level();
}
}
}
log_buffer.FlushBufferToLog();
assert(!manual.in_progress);
assert(HasPendingManualCompaction());
RemoveManualCompaction(&manual);
// if the manual job is unscheduled, try schedule other jobs in case there's
// any unscheduled compaction job which was blocked by exclusive manual
// compaction.
if (manual.status.IsIncomplete() &&
manual.status.subcode() == Status::SubCode::kManualCompactionPaused) {
MaybeScheduleFlushOrCompaction();
}
bg_cv_.SignalAll();
return manual.status;
}
void DBImpl::GenerateFlushRequest(const autovector<ColumnFamilyData*>& cfds,
FlushReason flush_reason, FlushRequest* req) {
assert(req != nullptr);
req->flush_reason = flush_reason;
req->cfd_to_max_mem_id_to_persist.reserve(cfds.size());
for (const auto cfd : cfds) {
if (nullptr == cfd) {
// cfd may be null, see DBImpl::ScheduleFlushes
continue;
}
uint64_t max_memtable_id = cfd->imm()->GetLatestMemTableID(
immutable_db_options_.atomic_flush /* for_atomic_flush */);
req->cfd_to_max_mem_id_to_persist.emplace(cfd, max_memtable_id);
}
}
Status DBImpl::FlushMemTable(ColumnFamilyData* cfd,
const FlushOptions& flush_options,
FlushReason flush_reason,
bool entered_write_thread) {
// This method should not be called if atomic_flush is true.
assert(!immutable_db_options_.atomic_flush);
if (!flush_options.wait && write_controller_.IsStopped()) {
std::ostringstream oss;
oss << "Writes have been stopped, thus unable to perform manual flush. "
"Please try again later after writes are resumed";
return Status::TryAgain(oss.str());
}
Status s;
if (!flush_options.allow_write_stall) {
bool flush_needed = true;
s = WaitUntilFlushWouldNotStallWrites(cfd, &flush_needed);
TEST_SYNC_POINT("DBImpl::FlushMemTable:StallWaitDone");
if (!s.ok() || !flush_needed) {
return s;
}
}
const bool needs_to_join_write_thread = !entered_write_thread;
autovector<FlushRequest> flush_reqs;
autovector<uint64_t> memtable_ids_to_wait;
{
WriteContext context;
InstrumentedMutexLock guard_lock(&mutex_);
WriteThread::Writer w;
WriteThread::Writer nonmem_w;
if (needs_to_join_write_thread) {
write_thread_.EnterUnbatched(&w, &mutex_);
if (two_write_queues_) {
nonmem_write_thread_.EnterUnbatched(&nonmem_w, &mutex_);
}
}
WaitForPendingWrites();
if (!cfd->mem()->IsEmpty() || !cached_recoverable_state_empty_.load()) {
s = SwitchMemtable(cfd, &context);
}
const uint64_t flush_memtable_id = std::numeric_limits<uint64_t>::max();
if (s.ok()) {
if (cfd->imm()->NumNotFlushed() != 0 || !cfd->mem()->IsEmpty() ||
!cached_recoverable_state_empty_.load()) {
FlushRequest req{flush_reason, {{cfd, flush_memtable_id}}};
flush_reqs.emplace_back(std::move(req));
memtable_ids_to_wait.emplace_back(
cfd->imm()->GetLatestMemTableID(false /* for_atomic_flush */));
}
if (immutable_db_options_.persist_stats_to_disk) {
ColumnFamilyData* cfd_stats =
versions_->GetColumnFamilySet()->GetColumnFamily(
kPersistentStatsColumnFamilyName);
if (cfd_stats != nullptr && cfd_stats != cfd &&
!cfd_stats->mem()->IsEmpty()) {
// only force flush stats CF when it will be the only CF lagging
// behind after the current flush
bool stats_cf_flush_needed = true;
for (auto* loop_cfd : *versions_->GetColumnFamilySet()) {
if (loop_cfd == cfd_stats || loop_cfd == cfd) {
continue;
}
if (loop_cfd->GetLogNumber() <= cfd_stats->GetLogNumber()) {
stats_cf_flush_needed = false;
}
}
if (stats_cf_flush_needed) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Force flushing stats CF with manual flush of %s "
"to avoid holding old logs",
cfd->GetName().c_str());
s = SwitchMemtable(cfd_stats, &context);
FlushRequest req{flush_reason, {{cfd_stats, flush_memtable_id}}};
flush_reqs.emplace_back(std::move(req));
memtable_ids_to_wait.emplace_back(
cfd_stats->imm()->GetLatestMemTableID(
false /* for_atomic_flush */));
}
}
}
}
if (s.ok() && !flush_reqs.empty()) {
for (const auto& req : flush_reqs) {
assert(req.cfd_to_max_mem_id_to_persist.size() == 1);
ColumnFamilyData* loop_cfd =
req.cfd_to_max_mem_id_to_persist.begin()->first;
loop_cfd->imm()->FlushRequested();
}
// If the caller wants to wait for this flush to complete, it indicates
// that the caller expects the ColumnFamilyData not to be free'ed by
// other threads which may drop the column family concurrently.
// Therefore, we increase the cfd's ref count.
if (flush_options.wait) {
for (const auto& req : flush_reqs) {
assert(req.cfd_to_max_mem_id_to_persist.size() == 1);
ColumnFamilyData* loop_cfd =
req.cfd_to_max_mem_id_to_persist.begin()->first;
loop_cfd->Ref();
}
}
for (const auto& req : flush_reqs) {
SchedulePendingFlush(req);
}
MaybeScheduleFlushOrCompaction();
}
if (needs_to_join_write_thread) {
write_thread_.ExitUnbatched(&w);
if (two_write_queues_) {
nonmem_write_thread_.ExitUnbatched(&nonmem_w);
}
}
}
TEST_SYNC_POINT("DBImpl::FlushMemTable:AfterScheduleFlush");
TEST_SYNC_POINT("DBImpl::FlushMemTable:BeforeWaitForBgFlush");
if (s.ok() && flush_options.wait) {
autovector<ColumnFamilyData*> cfds;
autovector<const uint64_t*> flush_memtable_ids;
assert(flush_reqs.size() == memtable_ids_to_wait.size());
for (size_t i = 0; i < flush_reqs.size(); ++i) {
assert(flush_reqs[i].cfd_to_max_mem_id_to_persist.size() == 1);
cfds.push_back(flush_reqs[i].cfd_to_max_mem_id_to_persist.begin()->first);
flush_memtable_ids.push_back(&(memtable_ids_to_wait[i]));
}
s = WaitForFlushMemTables(
cfds, flush_memtable_ids,
flush_reason == FlushReason::kErrorRecovery /* resuming_from_bg_err */);
InstrumentedMutexLock lock_guard(&mutex_);
for (auto* tmp_cfd : cfds) {
tmp_cfd->UnrefAndTryDelete();
}
}
TEST_SYNC_POINT("DBImpl::FlushMemTable:FlushMemTableFinished");
return s;
}
Status DBImpl::AtomicFlushMemTables(
const FlushOptions& flush_options, FlushReason flush_reason,
const autovector<ColumnFamilyData*>& provided_candidate_cfds,
bool entered_write_thread) {
assert(immutable_db_options_.atomic_flush);
if (!flush_options.wait && write_controller_.IsStopped()) {
std::ostringstream oss;
oss << "Writes have been stopped, thus unable to perform manual flush. "
"Please try again later after writes are resumed";
return Status::TryAgain(oss.str());
}
Status s;
autovector<ColumnFamilyData*> candidate_cfds;
if (provided_candidate_cfds.empty()) {
// Generate candidate cfds if not provided
{
InstrumentedMutexLock l(&mutex_);
for (ColumnFamilyData* cfd : *versions_->GetColumnFamilySet()) {
if (!cfd->IsDropped() && cfd->initialized()) {
cfd->Ref();
candidate_cfds.push_back(cfd);
}
}
}
} else {
candidate_cfds = provided_candidate_cfds;
}
if (!flush_options.allow_write_stall) {
int num_cfs_to_flush = 0;
for (auto cfd : candidate_cfds) {
bool flush_needed = true;
s = WaitUntilFlushWouldNotStallWrites(cfd, &flush_needed);
if (!s.ok()) {
// Unref the newly generated candidate cfds (when not provided) in
// `candidate_cfds`
if (provided_candidate_cfds.empty()) {
for (auto candidate_cfd : candidate_cfds) {
candidate_cfd->UnrefAndTryDelete();
}
}
return s;
} else if (flush_needed) {
++num_cfs_to_flush;
}
}
if (0 == num_cfs_to_flush) {
// Unref the newly generated candidate cfds (when not provided) in
// `candidate_cfds`
if (provided_candidate_cfds.empty()) {
for (auto candidate_cfd : candidate_cfds) {
candidate_cfd->UnrefAndTryDelete();
}
}
return s;
}
}
const bool needs_to_join_write_thread = !entered_write_thread;
FlushRequest flush_req;
autovector<ColumnFamilyData*> cfds;
{
WriteContext context;
InstrumentedMutexLock guard_lock(&mutex_);
WriteThread::Writer w;
WriteThread::Writer nonmem_w;
if (needs_to_join_write_thread) {
write_thread_.EnterUnbatched(&w, &mutex_);
if (two_write_queues_) {
nonmem_write_thread_.EnterUnbatched(&nonmem_w, &mutex_);
}
}
WaitForPendingWrites();
SelectColumnFamiliesForAtomicFlush(&cfds, candidate_cfds);
// Unref the newly generated candidate cfds (when not provided) in
// `candidate_cfds`
if (provided_candidate_cfds.empty()) {
for (auto candidate_cfd : candidate_cfds) {
candidate_cfd->UnrefAndTryDelete();
}
}
for (auto cfd : cfds) {
if (cfd->mem()->IsEmpty() && cached_recoverable_state_empty_.load()) {
continue;
}
cfd->Ref();
s = SwitchMemtable(cfd, &context);
cfd->UnrefAndTryDelete();
if (!s.ok()) {
break;
}
}
if (s.ok()) {
AssignAtomicFlushSeq(cfds);
for (auto cfd : cfds) {
cfd->imm()->FlushRequested();
}
// If the caller wants to wait for this flush to complete, it indicates
// that the caller expects the ColumnFamilyData not to be free'ed by
// other threads which may drop the column family concurrently.
// Therefore, we increase the cfd's ref count.
if (flush_options.wait) {
for (auto cfd : cfds) {
cfd->Ref();
}
}
GenerateFlushRequest(cfds, flush_reason, &flush_req);
SchedulePendingFlush(flush_req);
MaybeScheduleFlushOrCompaction();
}
if (needs_to_join_write_thread) {
write_thread_.ExitUnbatched(&w);
if (two_write_queues_) {
nonmem_write_thread_.ExitUnbatched(&nonmem_w);
}
}
}
TEST_SYNC_POINT("DBImpl::AtomicFlushMemTables:AfterScheduleFlush");
TEST_SYNC_POINT("DBImpl::AtomicFlushMemTables:BeforeWaitForBgFlush");
if (s.ok() && flush_options.wait) {
autovector<const uint64_t*> flush_memtable_ids;
for (auto& iter : flush_req.cfd_to_max_mem_id_to_persist) {
flush_memtable_ids.push_back(&(iter.second));
}
s = WaitForFlushMemTables(
cfds, flush_memtable_ids,
flush_reason == FlushReason::kErrorRecovery /* resuming_from_bg_err */);
InstrumentedMutexLock lock_guard(&mutex_);
for (auto* cfd : cfds) {
cfd->UnrefAndTryDelete();
}
}
return s;
}
Status DBImpl::RetryFlushesForErrorRecovery(FlushReason flush_reason,
bool wait) {
mutex_.AssertHeld();
assert(flush_reason == FlushReason::kErrorRecoveryRetryFlush ||
flush_reason == FlushReason::kCatchUpAfterErrorRecovery);
// Collect referenced CFDs.
autovector<ColumnFamilyData*> cfds;
for (ColumnFamilyData* cfd : *versions_->GetColumnFamilySet()) {
if (!cfd->IsDropped() && cfd->initialized() &&
cfd->imm()->NumNotFlushed() != 0) {
cfd->Ref();
cfd->imm()->FlushRequested();
cfds.push_back(cfd);
}
}
// Submit flush requests for all immutable memtables needing flush.
// `flush_memtable_ids` will be populated such that all immutable
// memtables eligible for flush are waited on before this function
// returns.
autovector<uint64_t> flush_memtable_ids;
if (immutable_db_options_.atomic_flush) {
FlushRequest flush_req;
GenerateFlushRequest(cfds, flush_reason, &flush_req);
SchedulePendingFlush(flush_req);
for (auto& iter : flush_req.cfd_to_max_mem_id_to_persist) {
flush_memtable_ids.push_back(iter.second);
}
} else {
for (auto cfd : cfds) {
flush_memtable_ids.push_back(
cfd->imm()->GetLatestMemTableID(false /* for_atomic_flush */));
// Impose no bound on the highest memtable ID flushed. There is no
// reason to do so outside of atomic flush.
FlushRequest flush_req{
flush_reason,
{{cfd,
std::numeric_limits<uint64_t>::max() /* max_mem_id_to_persist */}}};
SchedulePendingFlush(flush_req);
}
}
MaybeScheduleFlushOrCompaction();
Status s;
if (wait) {
mutex_.Unlock();
autovector<const uint64_t*> flush_memtable_id_ptrs;
for (auto& flush_memtable_id : flush_memtable_ids) {
flush_memtable_id_ptrs.push_back(&flush_memtable_id);
}
s = WaitForFlushMemTables(cfds, flush_memtable_id_ptrs,
true /* resuming_from_bg_err */);
mutex_.Lock();
}
for (auto* cfd : cfds) {
cfd->UnrefAndTryDelete();
}
return s;
}
// Calling FlushMemTable(), whether from DB::Flush() or from Backup Engine, can
// cause write stall, for example if one memtable is being flushed already.
// This method tries to avoid write stall (similar to CompactRange() behavior)
// it emulates how the SuperVersion / LSM would change if flush happens, checks
// it against various constrains and delays flush if it'd cause write stall.
// Caller should check status and flush_needed to see if flush already happened.
Status DBImpl::WaitUntilFlushWouldNotStallWrites(ColumnFamilyData* cfd,
bool* flush_needed) {
{
*flush_needed = true;
InstrumentedMutexLock l(&mutex_);
uint64_t orig_active_memtable_id = cfd->mem()->GetID();
WriteStallCondition write_stall_condition = WriteStallCondition::kNormal;
do {
if (write_stall_condition != WriteStallCondition::kNormal) {
// Same error handling as user writes: Don't wait if there's a
// background error, even if it's a soft error. We might wait here
// indefinitely as the pending flushes/compactions may never finish
// successfully, resulting in the stall condition lasting indefinitely
if (error_handler_.IsBGWorkStopped()) {
return error_handler_.GetBGError();
}
TEST_SYNC_POINT("DBImpl::WaitUntilFlushWouldNotStallWrites:StallWait");
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"[%s] WaitUntilFlushWouldNotStallWrites"
" waiting on stall conditions to clear",
cfd->GetName().c_str());
bg_cv_.Wait();
}
if (cfd->IsDropped()) {
return Status::ColumnFamilyDropped();
}
if (shutting_down_.load(std::memory_order_acquire)) {
return Status::ShutdownInProgress();
}
uint64_t earliest_memtable_id =
std::min(cfd->mem()->GetID(), cfd->imm()->GetEarliestMemTableID());
if (earliest_memtable_id > orig_active_memtable_id) {
// We waited so long that the memtable we were originally waiting on was
// flushed.
*flush_needed = false;
return Status::OK();
}
const auto& mutable_cf_options = *cfd->GetLatestMutableCFOptions();
const auto* vstorage = cfd->current()->storage_info();
// Skip stalling check if we're below auto-flush and auto-compaction
// triggers. If it stalled in these conditions, that'd mean the stall
// triggers are so low that stalling is needed for any background work. In
// that case we shouldn't wait since background work won't be scheduled.
if (cfd->imm()->NumNotFlushed() <
cfd->ioptions()->min_write_buffer_number_to_merge &&
vstorage->l0_delay_trigger_count() <
mutable_cf_options.level0_file_num_compaction_trigger) {
break;
}
// check whether one extra immutable memtable or an extra L0 file would
// cause write stalling mode to be entered. It could still enter stall
// mode due to pending compaction bytes, but that's less common
// No extra immutable Memtable will be created if the current Memtable is
// empty.
int mem_to_flush = cfd->mem()->IsEmpty() ? 0 : 1;
write_stall_condition = ColumnFamilyData::GetWriteStallConditionAndCause(
cfd->imm()->NumNotFlushed() + mem_to_flush,
vstorage->l0_delay_trigger_count() + 1,
vstorage->estimated_compaction_needed_bytes(),
mutable_cf_options, *cfd->ioptions())
.first;
} while (write_stall_condition != WriteStallCondition::kNormal);
}
return Status::OK();
}
// Wait for memtables to be flushed for multiple column families.
// let N = cfds.size()
// for i in [0, N),
// 1) if flush_memtable_ids[i] is not null, then the memtables with lower IDs
// have to be flushed for THIS column family;
// 2) if flush_memtable_ids[i] is null, then all memtables in THIS column
// family have to be flushed.
// Finish waiting when ALL column families finish flushing memtables.
// resuming_from_bg_err indicates whether the caller is trying to resume from
// background error or in normal processing.
Status DBImpl::WaitForFlushMemTables(
const autovector<ColumnFamilyData*>& cfds,
const autovector<const uint64_t*>& flush_memtable_ids,
bool resuming_from_bg_err) {
int num = static_cast<int>(cfds.size());
// Wait until the compaction completes
InstrumentedMutexLock l(&mutex_);
Status s;
// If the caller is trying to resume from bg error, then
// error_handler_.IsDBStopped() is true.
while (resuming_from_bg_err || !error_handler_.IsDBStopped()) {
if (shutting_down_.load(std::memory_order_acquire)) {
s = Status::ShutdownInProgress();
return s;
}
// If an error has occurred during resumption, then no need to wait.
// But flush operation may fail because of this error, so need to
// return the status.
if (!error_handler_.GetRecoveryError().ok()) {
s = error_handler_.GetRecoveryError();
break;
}
// If BGWorkStopped, which indicate that there is a BG error and
// 1) soft error but requires no BG work, 2) no in auto_recovery_
if (!resuming_from_bg_err && error_handler_.IsBGWorkStopped() &&
error_handler_.GetBGError().severity() < Status::Severity::kHardError) {
s = error_handler_.GetBGError();
return s;
}
// Number of column families that have been dropped.
int num_dropped = 0;
// Number of column families that have finished flush.
int num_finished = 0;
for (int i = 0; i < num; ++i) {
if (cfds[i]->IsDropped()) {
++num_dropped;
} else if (cfds[i]->imm()->NumNotFlushed() == 0 ||
(flush_memtable_ids[i] != nullptr &&
cfds[i]->imm()->GetEarliestMemTableID() >
*flush_memtable_ids[i])) {
++num_finished;
}
}
if (1 == num_dropped && 1 == num) {
s = Status::ColumnFamilyDropped();
return s;
}
// Column families involved in this flush request have either been dropped
// or finished flush. Then it's time to finish waiting.
if (num_dropped + num_finished == num) {
break;
}
bg_cv_.Wait();
}
// If not resuming from bg error, and an error has caused the DB to stop,
// then report the bg error to caller.
if (!resuming_from_bg_err && error_handler_.IsDBStopped()) {
s = error_handler_.GetBGError();
}
return s;
}
Status DBImpl::EnableAutoCompaction(
const std::vector<ColumnFamilyHandle*>& column_family_handles) {
Status s;
for (auto cf_ptr : column_family_handles) {
Status status =
this->SetOptions(cf_ptr, {{"disable_auto_compactions", "false"}});
if (!status.ok()) {
s = status;
}
}
return s;
}
// NOTE: Calling DisableManualCompaction() may overwrite the
// user-provided canceled variable in CompactRangeOptions
void DBImpl::DisableManualCompaction() {
InstrumentedMutexLock l(&mutex_);
manual_compaction_paused_.fetch_add(1, std::memory_order_release);
// Mark the canceled as true when the cancellation is triggered by
// manual_compaction_paused (may overwrite user-provided `canceled`)
for (const auto& manual_compaction : manual_compaction_dequeue_) {
manual_compaction->canceled = true;
}
// Wake up manual compactions waiting to start.
bg_cv_.SignalAll();
// Wait for any pending manual compactions to finish (typically through
// failing with `Status::Incomplete`) prior to returning. This way we are
// guaranteed no pending manual compaction will commit while manual
// compactions are "disabled".
while (HasPendingManualCompaction()) {
bg_cv_.Wait();
}
}
// NOTE: In contrast to DisableManualCompaction(), calling
// EnableManualCompaction() does NOT overwrite the user-provided *canceled
// variable to be false since there is NO CHANCE a canceled compaction
// is uncanceled. In other words, a canceled compaction must have been
// dropped out of the manual compaction queue, when we disable it.
void DBImpl::EnableManualCompaction() {
InstrumentedMutexLock l(&mutex_);
assert(manual_compaction_paused_ > 0);
manual_compaction_paused_.fetch_sub(1, std::memory_order_release);
}
void DBImpl::MaybeScheduleFlushOrCompaction() {
mutex_.AssertHeld();
TEST_SYNC_POINT("DBImpl::MaybeScheduleFlushOrCompaction:Start");
if (!opened_successfully_) {
// Compaction may introduce data race to DB open
return;
}
if (bg_work_paused_ > 0) {
// we paused the background work
return;
} else if (error_handler_.IsBGWorkStopped() &&
!error_handler_.IsRecoveryInProgress()) {
// There has been a hard error and this call is not part of the recovery
// sequence. Bail out here so we don't get into an endless loop of
// scheduling BG work which will again call this function
//
// Note that a non-recovery flush can still be scheduled if
// error_handler_.IsRecoveryInProgress() returns true. We rely on
// BackgroundCallFlush() to check flush reason and drop non-recovery
// flushes.
return;
} else if (shutting_down_.load(std::memory_order_acquire)) {
// DB is being deleted; no more background compactions
return;
}
auto bg_job_limits = GetBGJobLimits();
bool is_flush_pool_empty =
env_->GetBackgroundThreads(Env::Priority::HIGH) == 0;
while (!is_flush_pool_empty && unscheduled_flushes_ > 0 &&
bg_flush_scheduled_ < bg_job_limits.max_flushes) {
TEST_SYNC_POINT_CALLBACK(
"DBImpl::MaybeScheduleFlushOrCompaction:BeforeSchedule",
&unscheduled_flushes_);
bg_flush_scheduled_++;
FlushThreadArg* fta = new FlushThreadArg;
fta->db_ = this;
fta->thread_pri_ = Env::Priority::HIGH;
env_->Schedule(&DBImpl::BGWorkFlush, fta, Env::Priority::HIGH, this,
&DBImpl::UnscheduleFlushCallback);
--unscheduled_flushes_;
TEST_SYNC_POINT_CALLBACK(
"DBImpl::MaybeScheduleFlushOrCompaction:AfterSchedule:0",
&unscheduled_flushes_);
}
// special case -- if high-pri (flush) thread pool is empty, then schedule
// flushes in low-pri (compaction) thread pool.
if (is_flush_pool_empty) {
while (unscheduled_flushes_ > 0 &&
bg_flush_scheduled_ + bg_compaction_scheduled_ <
bg_job_limits.max_flushes) {
bg_flush_scheduled_++;
FlushThreadArg* fta = new FlushThreadArg;
fta->db_ = this;
fta->thread_pri_ = Env::Priority::LOW;
env_->Schedule(&DBImpl::BGWorkFlush, fta, Env::Priority::LOW, this,
&DBImpl::UnscheduleFlushCallback);
--unscheduled_flushes_;
}
}
if (bg_compaction_paused_ > 0) {
// we paused the background compaction
return;
} else if (error_handler_.IsBGWorkStopped()) {
// Compaction is not part of the recovery sequence from a hard error. We
// might get here because recovery might do a flush and install a new
// super version, which will try to schedule pending compactions. Bail
// out here and let the higher level recovery handle compactions
return;
}
if (HasExclusiveManualCompaction()) {
// only manual compactions are allowed to run. don't schedule automatic
// compactions
TEST_SYNC_POINT("DBImpl::MaybeScheduleFlushOrCompaction:Conflict");
return;
}
while (bg_compaction_scheduled_ + bg_bottom_compaction_scheduled_ <
bg_job_limits.max_compactions &&
unscheduled_compactions_ > 0) {
CompactionArg* ca = new CompactionArg;
ca->db = this;
ca->compaction_pri_ = Env::Priority::LOW;
ca->prepicked_compaction = nullptr;
bg_compaction_scheduled_++;
unscheduled_compactions_--;
env_->Schedule(&DBImpl::BGWorkCompaction, ca, Env::Priority::LOW, this,
&DBImpl::UnscheduleCompactionCallback);
}
}
DBImpl::BGJobLimits DBImpl::GetBGJobLimits() const {
mutex_.AssertHeld();
return GetBGJobLimits(mutable_db_options_.max_background_flushes,
mutable_db_options_.max_background_compactions,
mutable_db_options_.max_background_jobs,
write_controller_.NeedSpeedupCompaction());
}
DBImpl::BGJobLimits DBImpl::GetBGJobLimits(int max_background_flushes,
int max_background_compactions,
int max_background_jobs,
bool parallelize_compactions) {
BGJobLimits res;
if (max_background_flushes == -1 && max_background_compactions == -1) {
// for our first stab implementing max_background_jobs, simply allocate a
// quarter of the threads to flushes.
res.max_flushes = std::max(1, max_background_jobs / 4);
res.max_compactions = std::max(1, max_background_jobs - res.max_flushes);
} else {
// compatibility code in case users haven't migrated to max_background_jobs,
// which automatically computes flush/compaction limits
res.max_flushes = std::max(1, max_background_flushes);
res.max_compactions = std::max(1, max_background_compactions);
}
if (!parallelize_compactions) {
// throttle background compactions until we deem necessary
res.max_compactions = 1;
}
return res;
}
void DBImpl::AddToCompactionQueue(ColumnFamilyData* cfd) {
assert(!cfd->queued_for_compaction());
cfd->Ref();
compaction_queue_.push_back(cfd);
cfd->set_queued_for_compaction(true);
}
ColumnFamilyData* DBImpl::PopFirstFromCompactionQueue() {
assert(!compaction_queue_.empty());
auto cfd = *compaction_queue_.begin();
compaction_queue_.pop_front();
assert(cfd->queued_for_compaction());
cfd->set_queued_for_compaction(false);
return cfd;
}
DBImpl::FlushRequest DBImpl::PopFirstFromFlushQueue() {
assert(!flush_queue_.empty());
FlushRequest flush_req = std::move(flush_queue_.front());
flush_queue_.pop_front();
if (!immutable_db_options_.atomic_flush) {
assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1);
}
for (const auto& elem : flush_req.cfd_to_max_mem_id_to_persist) {
if (!immutable_db_options_.atomic_flush) {
ColumnFamilyData* cfd = elem.first;
assert(cfd);
assert(cfd->queued_for_flush());
cfd->set_queued_for_flush(false);
}
}
return flush_req;
}
ColumnFamilyData* DBImpl::PickCompactionFromQueue(
std::unique_ptr<TaskLimiterToken>* token, LogBuffer* log_buffer) {
assert(!compaction_queue_.empty());
assert(*token == nullptr);
autovector<ColumnFamilyData*> throttled_candidates;
ColumnFamilyData* cfd = nullptr;
while (!compaction_queue_.empty()) {
auto first_cfd = *compaction_queue_.begin();
compaction_queue_.pop_front();
assert(first_cfd->queued_for_compaction());
if (!RequestCompactionToken(first_cfd, false, token, log_buffer)) {
throttled_candidates.push_back(first_cfd);
continue;
}
cfd = first_cfd;
cfd->set_queued_for_compaction(false);
break;
}
// Add throttled compaction candidates back to queue in the original order.
for (auto iter = throttled_candidates.rbegin();
iter != throttled_candidates.rend(); ++iter) {
compaction_queue_.push_front(*iter);
}
return cfd;
}
void DBImpl::SchedulePendingFlush(const FlushRequest& flush_req) {
mutex_.AssertHeld();
if (reject_new_background_jobs_) {
return;
}
if (flush_req.cfd_to_max_mem_id_to_persist.empty()) {
return;
}
if (!immutable_db_options_.atomic_flush) {
// For the non-atomic flush case, we never schedule multiple column
// families in the same flush request.
assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1);
ColumnFamilyData* cfd =
flush_req.cfd_to_max_mem_id_to_persist.begin()->first;
assert(cfd);
if (!cfd->queued_for_flush() && cfd->imm()->IsFlushPending()) {
cfd->Ref();
cfd->set_queued_for_flush(true);
++unscheduled_flushes_;
flush_queue_.push_back(flush_req);
}
} else {
for (auto& iter : flush_req.cfd_to_max_mem_id_to_persist) {
ColumnFamilyData* cfd = iter.first;
cfd->Ref();
}
++unscheduled_flushes_;
flush_queue_.push_back(flush_req);
}
}
void DBImpl::SchedulePendingCompaction(ColumnFamilyData* cfd) {
mutex_.AssertHeld();
if (reject_new_background_jobs_) {
return;
}
if (!cfd->queued_for_compaction() && cfd->NeedsCompaction()) {
AddToCompactionQueue(cfd);
++unscheduled_compactions_;
}
}
void DBImpl::SchedulePendingPurge(std::string fname, std::string dir_to_sync,
FileType type, uint64_t number, int job_id) {
mutex_.AssertHeld();
if (reject_new_background_jobs_) {
return;
}
PurgeFileInfo file_info(fname, dir_to_sync, type, number, job_id);
purge_files_.insert({{number, std::move(file_info)}});
}
void DBImpl::BGWorkFlush(void* arg) {
FlushThreadArg fta = *(static_cast<FlushThreadArg*>(arg));
delete static_cast<FlushThreadArg*>(arg);
IOSTATS_SET_THREAD_POOL_ID(fta.thread_pri_);
TEST_SYNC_POINT("DBImpl::BGWorkFlush");
static_cast_with_check<DBImpl>(fta.db_)->BackgroundCallFlush(fta.thread_pri_);
TEST_SYNC_POINT("DBImpl::BGWorkFlush:done");
}
void DBImpl::BGWorkCompaction(void* arg) {
CompactionArg ca = *(static_cast<CompactionArg*>(arg));
delete static_cast<CompactionArg*>(arg);
IOSTATS_SET_THREAD_POOL_ID(Env::Priority::LOW);
TEST_SYNC_POINT("DBImpl::BGWorkCompaction");
auto prepicked_compaction =
static_cast<PrepickedCompaction*>(ca.prepicked_compaction);
static_cast_with_check<DBImpl>(ca.db)->BackgroundCallCompaction(
prepicked_compaction, Env::Priority::LOW);
delete prepicked_compaction;
}
void DBImpl::BGWorkBottomCompaction(void* arg) {
CompactionArg ca = *(static_cast<CompactionArg*>(arg));
delete static_cast<CompactionArg*>(arg);
IOSTATS_SET_THREAD_POOL_ID(Env::Priority::BOTTOM);
TEST_SYNC_POINT("DBImpl::BGWorkBottomCompaction");
auto* prepicked_compaction = ca.prepicked_compaction;
assert(prepicked_compaction && prepicked_compaction->compaction);
ca.db->BackgroundCallCompaction(prepicked_compaction, Env::Priority::BOTTOM);
delete prepicked_compaction;
}
void DBImpl::BGWorkPurge(void* db) {
IOSTATS_SET_THREAD_POOL_ID(Env::Priority::HIGH);
TEST_SYNC_POINT("DBImpl::BGWorkPurge:start");
static_cast<DBImpl*>(db)->BackgroundCallPurge();
TEST_SYNC_POINT("DBImpl::BGWorkPurge:end");
}
void DBImpl::UnscheduleCompactionCallback(void* arg) {
CompactionArg* ca_ptr = static_cast<CompactionArg*>(arg);
Env::Priority compaction_pri = ca_ptr->compaction_pri_;
if (Env::Priority::BOTTOM == compaction_pri) {
// Decrement bg_bottom_compaction_scheduled_ if priority is BOTTOM
ca_ptr->db->bg_bottom_compaction_scheduled_--;
} else if (Env::Priority::LOW == compaction_pri) {
// Decrement bg_compaction_scheduled_ if priority is LOW
ca_ptr->db->bg_compaction_scheduled_--;
}
CompactionArg ca = *(ca_ptr);
delete static_cast<CompactionArg*>(arg);
if (ca.prepicked_compaction != nullptr) {
// if it's a manual compaction, set status to ManualCompactionPaused
if (ca.prepicked_compaction->manual_compaction_state) {
ca.prepicked_compaction->manual_compaction_state->done = true;
ca.prepicked_compaction->manual_compaction_state->status =
Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
if (ca.prepicked_compaction->compaction != nullptr) {
ca.prepicked_compaction->compaction->ReleaseCompactionFiles(
Status::Incomplete(Status::SubCode::kManualCompactionPaused));
delete ca.prepicked_compaction->compaction;
}
delete ca.prepicked_compaction;
}
TEST_SYNC_POINT("DBImpl::UnscheduleCompactionCallback");
}
void DBImpl::UnscheduleFlushCallback(void* arg) {
// Decrement bg_flush_scheduled_ in flush callback
static_cast<FlushThreadArg*>(arg)->db_->bg_flush_scheduled_--;
Env::Priority flush_pri = static_cast<FlushThreadArg*>(arg)->thread_pri_;
if (Env::Priority::LOW == flush_pri) {
TEST_SYNC_POINT("DBImpl::UnscheduleLowFlushCallback");
} else if (Env::Priority::HIGH == flush_pri) {
TEST_SYNC_POINT("DBImpl::UnscheduleHighFlushCallback");
}
delete static_cast<FlushThreadArg*>(arg);
TEST_SYNC_POINT("DBImpl::UnscheduleFlushCallback");
}
Status DBImpl::BackgroundFlush(bool* made_progress, JobContext* job_context,
LogBuffer* log_buffer, FlushReason* reason,
bool* flush_rescheduled_to_retain_udt,
Env::Priority thread_pri) {
mutex_.AssertHeld();
Status status;
*reason = FlushReason::kOthers;
// If BG work is stopped due to an error, but a recovery is in progress,
// that means this flush is part of the recovery. So allow it to go through
if (!error_handler_.IsBGWorkStopped()) {
if (shutting_down_.load(std::memory_order_acquire)) {
status = Status::ShutdownInProgress();
}
} else if (!error_handler_.IsRecoveryInProgress()) {
status = error_handler_.GetBGError();
}
if (!status.ok()) {
return status;
}
autovector<BGFlushArg> bg_flush_args;
std::vector<SuperVersionContext>& superversion_contexts =
job_context->superversion_contexts;
autovector<ColumnFamilyData*> column_families_not_to_flush;
while (!flush_queue_.empty()) {
// This cfd is already referenced
FlushRequest flush_req = PopFirstFromFlushQueue();
FlushReason flush_reason = flush_req.flush_reason;
if (!error_handler_.GetBGError().ok() && error_handler_.IsBGWorkStopped() &&
flush_reason != FlushReason::kErrorRecovery &&
flush_reason != FlushReason::kErrorRecoveryRetryFlush) {
// Stop non-recovery flush when bg work is stopped
// Note that we drop the flush request here.
// Recovery thread should schedule further flushes after bg error
// is cleared.
status = error_handler_.GetBGError();
assert(!status.ok());
ROCKS_LOG_BUFFER(log_buffer,
"[JOB %d] Abort flush due to background error %s",
job_context->job_id, status.ToString().c_str());
*reason = flush_reason;
for (auto item : flush_req.cfd_to_max_mem_id_to_persist) {
item.first->UnrefAndTryDelete();
}
return status;
}
if (!immutable_db_options_.atomic_flush &&
ShouldRescheduleFlushRequestToRetainUDT(flush_req)) {
assert(flush_req.cfd_to_max_mem_id_to_persist.size() == 1);
ColumnFamilyData* cfd =
flush_req.cfd_to_max_mem_id_to_persist.begin()->first;
if (cfd->UnrefAndTryDelete()) {
return Status::OK();
}
ROCKS_LOG_BUFFER(log_buffer,
"FlushRequest for column family %s is re-scheduled to "
"retain user-defined timestamps.",
cfd->GetName().c_str());
// Reschedule the `FlushRequest` as is without checking dropped column
// family etc. The follow-up job will do the check anyways, so save the
// duplication. Column family is deduplicated by `SchdulePendingFlush` and
// `PopFirstFromFlushQueue` contains at flush request enqueueing and
// dequeueing time.
// This flush request is rescheduled right after it's popped from the
// queue while the db mutex is held, so there should be no other
// FlushRequest for the same column family with higher `max_memtable_id`
// in the queue to block the reschedule from succeeding.
#ifndef NDEBUG
flush_req.reschedule_count += 1;
#endif /* !NDEBUG */
SchedulePendingFlush(flush_req);
*reason = flush_reason;
*flush_rescheduled_to_retain_udt = true;
return Status::TryAgain();
}
superversion_contexts.clear();
superversion_contexts.reserve(
flush_req.cfd_to_max_mem_id_to_persist.size());
for (const auto& [cfd, max_memtable_id] :
flush_req.cfd_to_max_mem_id_to_persist) {
if (cfd->GetMempurgeUsed()) {
// If imm() contains silent memtables (e.g.: because
// MemPurge was activated), requesting a flush will
// mark the imm_needed as true.
cfd->imm()->FlushRequested();
}
if (cfd->IsDropped() || !cfd->imm()->IsFlushPending()) {
// can't flush this CF, try next one
column_families_not_to_flush.push_back(cfd);
continue;
}
superversion_contexts.emplace_back(true);
bg_flush_args.emplace_back(cfd, max_memtable_id,
&(superversion_contexts.back()), flush_reason);
}
// `MaybeScheduleFlushOrCompaction` schedules as many `BackgroundCallFlush`
// jobs as the number of `FlushRequest` in the `flush_queue_`, a.k.a
// `unscheduled_flushes_`. So it's sufficient to make each `BackgroundFlush`
// handle one `FlushRequest` and each have a Status returned.
if (!bg_flush_args.empty() || !column_families_not_to_flush.empty()) {
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundFlush:CheckFlushRequest:cb",
const_cast<int*>(&flush_req.reschedule_count));
break;
}
}
if (!bg_flush_args.empty()) {
auto bg_job_limits = GetBGJobLimits();
for (const auto& arg : bg_flush_args) {
ColumnFamilyData* cfd = arg.cfd_;
ROCKS_LOG_BUFFER(
log_buffer,
"Calling FlushMemTableToOutputFile with column "
"family [%s], flush slots available %d, compaction slots available "
"%d, "
"flush slots scheduled %d, compaction slots scheduled %d",
cfd->GetName().c_str(), bg_job_limits.max_flushes,
bg_job_limits.max_compactions, bg_flush_scheduled_,
bg_compaction_scheduled_);
}
status = FlushMemTablesToOutputFiles(bg_flush_args, made_progress,
job_context, log_buffer, thread_pri);
TEST_SYNC_POINT("DBImpl::BackgroundFlush:BeforeFlush");
// All the CFD/bg_flush_arg in the FlushReq must have the same flush reason, so
// just grab the first one
#ifndef NDEBUG
for (const auto& bg_flush_arg : bg_flush_args) {
assert(bg_flush_arg.flush_reason_ == bg_flush_args[0].flush_reason_);
}
#endif /* !NDEBUG */
*reason = bg_flush_args[0].flush_reason_;
for (auto& arg : bg_flush_args) {
ColumnFamilyData* cfd = arg.cfd_;
if (cfd->UnrefAndTryDelete()) {
arg.cfd_ = nullptr;
}
}
}
for (auto cfd : column_families_not_to_flush) {
cfd->UnrefAndTryDelete();
}
return status;
}
void DBImpl::BackgroundCallFlush(Env::Priority thread_pri) {
bool made_progress = false;
JobContext job_context(next_job_id_.fetch_add(1), true);
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCallFlush:start", nullptr);
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL,
immutable_db_options_.info_log.get());
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:Start:1");
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:Start:2");
{
InstrumentedMutexLock l(&mutex_);
assert(bg_flush_scheduled_);
num_running_flushes_++;
std::unique_ptr<std::list<uint64_t>::iterator>
pending_outputs_inserted_elem(new std::list<uint64_t>::iterator(
CaptureCurrentFileNumberInPendingOutputs()));
FlushReason reason;
bool flush_rescheduled_to_retain_udt = false;
Status s =
BackgroundFlush(&made_progress, &job_context, &log_buffer, &reason,
&flush_rescheduled_to_retain_udt, thread_pri);
if (s.IsTryAgain() && flush_rescheduled_to_retain_udt) {
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
mutex_.Unlock();
TEST_SYNC_POINT_CALLBACK("DBImpl::AfterRetainUDTReschedule:cb", nullptr);
immutable_db_options_.clock->SleepForMicroseconds(
100000); // prevent hot loop
mutex_.Lock();
} else if (!s.ok() && !s.IsShutdownInProgress() &&
!s.IsColumnFamilyDropped() &&
reason != FlushReason::kErrorRecovery) {
// Wait a little bit before retrying background flush in
// case this is an environmental problem and we do not want to
// chew up resources for failed flushes for the duration of
// the problem.
uint64_t error_cnt =
default_cf_internal_stats_->BumpAndGetBackgroundErrorCount();
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
mutex_.Unlock();
ROCKS_LOG_ERROR(immutable_db_options_.info_log,
"[JOB %d] Waiting after background flush error: %s"
"Accumulated background error counts: %" PRIu64,
job_context.job_id, s.ToString().c_str(), error_cnt);
log_buffer.FlushBufferToLog();
LogFlush(immutable_db_options_.info_log);
immutable_db_options_.clock->SleepForMicroseconds(1000000);
mutex_.Lock();
}
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:FlushFinish:0");
ReleaseFileNumberFromPendingOutputs(pending_outputs_inserted_elem);
// There is no need to find obsolete files if the flush job is rescheduled
// to retain user-defined timestamps because the job doesn't get to the
// stage of actually flushing the MemTables.
if (!flush_rescheduled_to_retain_udt) {
// If flush failed, we want to delete all temporary files that we might
// have created. Thus, we force full scan in FindObsoleteFiles()
FindObsoleteFiles(&job_context, !s.ok() && !s.IsShutdownInProgress() &&
!s.IsColumnFamilyDropped());
}
// delete unnecessary files if any, this is done outside the mutex
if (job_context.HaveSomethingToClean() ||
job_context.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
mutex_.Unlock();
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:FilesFound");
// Have to flush the info logs before bg_flush_scheduled_--
// because if bg_flush_scheduled_ becomes 0 and the lock is
// released, the deconstructor of DB can kick in and destroy all the
// states of DB so info_log might not be available after that point.
// It also applies to access other states that DB owns.
log_buffer.FlushBufferToLog();
if (job_context.HaveSomethingToDelete()) {
PurgeObsoleteFiles(job_context);
}
job_context.Clean();
mutex_.Lock();
}
TEST_SYNC_POINT("DBImpl::BackgroundCallFlush:ContextCleanedUp");
assert(num_running_flushes_ > 0);
num_running_flushes_--;
bg_flush_scheduled_--;
// See if there's more work to be done
MaybeScheduleFlushOrCompaction();
atomic_flush_install_cv_.SignalAll();
bg_cv_.SignalAll();
// IMPORTANT: there should be no code after calling SignalAll. This call may
// signal the DB destructor that it's OK to proceed with destruction. In
// that case, all DB variables will be dealloacated and referencing them
// will cause trouble.
}
}
void DBImpl::BackgroundCallCompaction(PrepickedCompaction* prepicked_compaction,
Env::Priority bg_thread_pri) {
bool made_progress = false;
JobContext job_context(next_job_id_.fetch_add(1), true);
TEST_SYNC_POINT("BackgroundCallCompaction:0");
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL,
immutable_db_options_.info_log.get());
{
InstrumentedMutexLock l(&mutex_);
num_running_compactions_++;
std::unique_ptr<std::list<uint64_t>::iterator>
pending_outputs_inserted_elem(new std::list<uint64_t>::iterator(
CaptureCurrentFileNumberInPendingOutputs()));
assert((bg_thread_pri == Env::Priority::BOTTOM &&
bg_bottom_compaction_scheduled_) ||
(bg_thread_pri == Env::Priority::LOW && bg_compaction_scheduled_));
Status s = BackgroundCompaction(&made_progress, &job_context, &log_buffer,
prepicked_compaction, bg_thread_pri);
TEST_SYNC_POINT("BackgroundCallCompaction:1");
if (s.IsBusy()) {
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
mutex_.Unlock();
immutable_db_options_.clock->SleepForMicroseconds(
10000); // prevent hot loop
mutex_.Lock();
} else if (!s.ok() && !s.IsShutdownInProgress() &&
!s.IsManualCompactionPaused() && !s.IsColumnFamilyDropped()) {
// Wait a little bit before retrying background compaction in
// case this is an environmental problem and we do not want to
// chew up resources for failed compactions for the duration of
// the problem.
uint64_t error_cnt =
default_cf_internal_stats_->BumpAndGetBackgroundErrorCount();
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
mutex_.Unlock();
log_buffer.FlushBufferToLog();
ROCKS_LOG_ERROR(immutable_db_options_.info_log,
"Waiting after background compaction error: %s, "
"Accumulated background error counts: %" PRIu64,
s.ToString().c_str(), error_cnt);
LogFlush(immutable_db_options_.info_log);
immutable_db_options_.clock->SleepForMicroseconds(1000000);
mutex_.Lock();
} else if (s.IsManualCompactionPaused()) {
assert(prepicked_compaction);
ManualCompactionState* m = prepicked_compaction->manual_compaction_state;
assert(m);
ROCKS_LOG_BUFFER(&log_buffer, "[%s] [JOB %d] Manual compaction paused",
m->cfd->GetName().c_str(), job_context.job_id);
}
ReleaseFileNumberFromPendingOutputs(pending_outputs_inserted_elem);
// If compaction failed, we want to delete all temporary files that we
// might have created (they might not be all recorded in job_context in
// case of a failure). Thus, we force full scan in FindObsoleteFiles()
FindObsoleteFiles(&job_context, !s.ok() && !s.IsShutdownInProgress() &&
!s.IsManualCompactionPaused() &&
!s.IsColumnFamilyDropped() &&
!s.IsBusy());
TEST_SYNC_POINT("DBImpl::BackgroundCallCompaction:FoundObsoleteFiles");
// delete unnecessary files if any, this is done outside the mutex
if (job_context.HaveSomethingToClean() ||
job_context.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
mutex_.Unlock();
// Have to flush the info logs before bg_compaction_scheduled_--
// because if bg_flush_scheduled_ becomes 0 and the lock is
// released, the deconstructor of DB can kick in and destroy all the
// states of DB so info_log might not be available after that point.
// It also applies to access other states that DB owns.
log_buffer.FlushBufferToLog();
if (job_context.HaveSomethingToDelete()) {
PurgeObsoleteFiles(job_context);
TEST_SYNC_POINT("DBImpl::BackgroundCallCompaction:PurgedObsoleteFiles");
}
job_context.Clean();
mutex_.Lock();
}
assert(num_running_compactions_ > 0);
num_running_compactions_--;
if (bg_thread_pri == Env::Priority::LOW) {
bg_compaction_scheduled_--;
} else {
assert(bg_thread_pri == Env::Priority::BOTTOM);
bg_bottom_compaction_scheduled_--;
}
// See if there's more work to be done
MaybeScheduleFlushOrCompaction();
if (prepicked_compaction != nullptr &&
prepicked_compaction->task_token != nullptr) {
// Releasing task tokens affects (and asserts on) the DB state, so
// must be done before we potentially signal the DB close process to
// proceed below.
prepicked_compaction->task_token.reset();
}
if (made_progress ||
(bg_compaction_scheduled_ == 0 &&
bg_bottom_compaction_scheduled_ == 0) ||
HasPendingManualCompaction() || unscheduled_compactions_ == 0) {
// signal if
// * made_progress -- need to wakeup DelayWrite
// * bg_{bottom,}_compaction_scheduled_ == 0 -- need to wakeup ~DBImpl
// * HasPendingManualCompaction -- need to wakeup RunManualCompaction
// If none of this is true, there is no need to signal since nobody is
// waiting for it
bg_cv_.SignalAll();
}
// IMPORTANT: there should be no code after calling SignalAll. This call may
// signal the DB destructor that it's OK to proceed with destruction. In
// that case, all DB variables will be dealloacated and referencing them
// will cause trouble.
}
}
Status DBImpl::BackgroundCompaction(bool* made_progress,
JobContext* job_context,
LogBuffer* log_buffer,
PrepickedCompaction* prepicked_compaction,
Env::Priority thread_pri) {
ManualCompactionState* manual_compaction =
prepicked_compaction == nullptr
? nullptr
: prepicked_compaction->manual_compaction_state;
*made_progress = false;
mutex_.AssertHeld();
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:Start");
const ReadOptions read_options(Env::IOActivity::kCompaction);
const WriteOptions write_options(Env::IOActivity::kCompaction);
bool is_manual = (manual_compaction != nullptr);
std::unique_ptr<Compaction> c;
if (prepicked_compaction != nullptr &&
prepicked_compaction->compaction != nullptr) {
c.reset(prepicked_compaction->compaction);
}
bool is_prepicked = is_manual || c;
// (manual_compaction->in_progress == false);
bool trivial_move_disallowed =
is_manual && manual_compaction->disallow_trivial_move;
CompactionJobStats compaction_job_stats;
Status status;
if (!error_handler_.IsBGWorkStopped()) {
if (shutting_down_.load(std::memory_order_acquire)) {
status = Status::ShutdownInProgress();
} else if (is_manual &&
manual_compaction->canceled.load(std::memory_order_acquire)) {
status = Status::Incomplete(Status::SubCode::kManualCompactionPaused);
}
} else {
status = error_handler_.GetBGError();
// If we get here, it means a hard error happened after this compaction
// was scheduled by MaybeScheduleFlushOrCompaction(), but before it got
// a chance to execute. Since we didn't pop a cfd from the compaction
// queue, increment unscheduled_compactions_
unscheduled_compactions_++;
}
if (!status.ok()) {
if (is_manual) {
manual_compaction->status = status;
manual_compaction->done = true;
manual_compaction->in_progress = false;
manual_compaction = nullptr;
}
if (c) {
c->ReleaseCompactionFiles(status);
c.reset();
}
return status;
}
if (is_manual) {
// another thread cannot pick up the same work
manual_compaction->in_progress = true;
}
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:InProgress");
std::unique_ptr<TaskLimiterToken> task_token;
bool sfm_reserved_compact_space = false;
if (is_manual) {
ManualCompactionState* m = manual_compaction;
assert(m->in_progress);
if (!c) {
m->done = true;
m->manual_end = nullptr;
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Manual compaction from level-%d from %s .. "
"%s; nothing to do\n",
m->cfd->GetName().c_str(), m->input_level,
(m->begin ? m->begin->DebugString(true).c_str() : "(begin)"),
(m->end ? m->end->DebugString(true).c_str() : "(end)"));
} else {
// First check if we have enough room to do the compaction
bool enough_room = EnoughRoomForCompaction(
m->cfd, *(c->inputs()), &sfm_reserved_compact_space, log_buffer);
if (!enough_room) {
// Then don't do the compaction
c->ReleaseCompactionFiles(status);
c.reset();
// m's vars will get set properly at the end of this function,
// as long as status == CompactionTooLarge
status = Status::CompactionTooLarge();
} else {
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Manual compaction from level-%d to level-%d from %s .. "
"%s; will stop at %s\n",
m->cfd->GetName().c_str(), m->input_level, c->output_level(),
(m->begin ? m->begin->DebugString(true).c_str() : "(begin)"),
(m->end ? m->end->DebugString(true).c_str() : "(end)"),
((m->done || m->manual_end == nullptr)
? "(end)"
: m->manual_end->DebugString(true).c_str()));
}
}
} else if (!is_prepicked && !compaction_queue_.empty()) {
if (HasExclusiveManualCompaction()) {
// Can't compact right now, but try again later
TEST_SYNC_POINT("DBImpl::BackgroundCompaction()::Conflict");
// Stay in the compaction queue.
unscheduled_compactions_++;
return Status::OK();
}
auto cfd = PickCompactionFromQueue(&task_token, log_buffer);
if (cfd == nullptr) {
// Can't find any executable task from the compaction queue.
// All tasks have been throttled by compaction thread limiter.
++unscheduled_compactions_;
return Status::Busy();
}
// We unreference here because the following code will take a Ref() on
// this cfd if it is going to use it (Compaction class holds a
// reference).
// This will all happen under a mutex so we don't have to be afraid of
// somebody else deleting it.
if (cfd->UnrefAndTryDelete()) {
// This was the last reference of the column family, so no need to
// compact.
return Status::OK();
}
// Pick up latest mutable CF Options and use it throughout the
// compaction job
// Compaction makes a copy of the latest MutableCFOptions. It should be used
// throughout the compaction procedure to make sure consistency. It will
// eventually be installed into SuperVersion
auto* mutable_cf_options = cfd->GetLatestMutableCFOptions();
if (!mutable_cf_options->disable_auto_compactions && !cfd->IsDropped()) {
// NOTE: try to avoid unnecessary copy of MutableCFOptions if
// compaction is not necessary. Need to make sure mutex is held
// until we make a copy in the following code
TEST_SYNC_POINT("DBImpl::BackgroundCompaction():BeforePickCompaction");
c.reset(cfd->PickCompaction(*mutable_cf_options, mutable_db_options_,
log_buffer));
TEST_SYNC_POINT("DBImpl::BackgroundCompaction():AfterPickCompaction");
if (c != nullptr) {
bool enough_room = EnoughRoomForCompaction(
cfd, *(c->inputs()), &sfm_reserved_compact_space, log_buffer);
if (!enough_room) {
// Then don't do the compaction
c->ReleaseCompactionFiles(status);
c->column_family_data()
->current()
->storage_info()
->ComputeCompactionScore(*(c->immutable_options()),
*(c->mutable_cf_options()));
AddToCompactionQueue(cfd);
++unscheduled_compactions_;
c.reset();
// Don't need to sleep here, because BackgroundCallCompaction
// will sleep if !s.ok()
status = Status::CompactionTooLarge();
} else {
// update statistics
size_t num_files = 0;
for (auto& each_level : *c->inputs()) {
num_files += each_level.files.size();
}
RecordInHistogram(stats_, NUM_FILES_IN_SINGLE_COMPACTION, num_files);
// There are three things that can change compaction score:
// 1) When flush or compaction finish. This case is covered by
// InstallSuperVersionAndScheduleWork
// 2) When MutableCFOptions changes. This case is also covered by
// InstallSuperVersionAndScheduleWork, because this is when the new
// options take effect.
// 3) When we Pick a new compaction, we "remove" those files being
// compacted from the calculation, which then influences compaction
// score. Here we check if we need the new compaction even without the
// files that are currently being compacted. If we need another
// compaction, we might be able to execute it in parallel, so we add
// it to the queue and schedule a new thread.
if (cfd->NeedsCompaction()) {
// Yes, we need more compactions!
AddToCompactionQueue(cfd);
++unscheduled_compactions_;
MaybeScheduleFlushOrCompaction();
}
}
}
}
}
IOStatus io_s;
bool compaction_released = false;
if (!c) {
// Nothing to do
ROCKS_LOG_BUFFER(log_buffer, "Compaction nothing to do");
} else if (c->deletion_compaction()) {
// TODO(icanadi) Do we want to honor snapshots here? i.e. not delete old
// file if there is alive snapshot pointing to it
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:BeforeCompaction",
c->column_family_data());
assert(c->num_input_files(1) == 0);
assert(c->column_family_data()->ioptions()->compaction_style ==
kCompactionStyleFIFO);
compaction_job_stats.num_input_files = c->num_input_files(0);
NotifyOnCompactionBegin(c->column_family_data(), c.get(), status,
compaction_job_stats, job_context->job_id);
for (const auto& f : *c->inputs(0)) {
c->edit()->DeleteFile(c->level(), f->fd.GetNumber());
}
status = versions_->LogAndApply(
c->column_family_data(), *c->mutable_cf_options(), read_options,
write_options, c->edit(), &mutex_, directories_.GetDbDir(),
/*new_descriptor_log=*/false, /*column_family_options=*/nullptr,
[&c, &compaction_released](const Status& s) {
c->ReleaseCompactionFiles(s);
compaction_released = true;
});
io_s = versions_->io_status();
InstallSuperVersionAndScheduleWork(
c->column_family_data(), job_context->superversion_contexts.data(),
*c->mutable_cf_options());
ROCKS_LOG_BUFFER(log_buffer, "[%s] Deleted %d files\n",
c->column_family_data()->GetName().c_str(),
c->num_input_files(0));
if (status.ok() && io_s.ok()) {
UpdateDeletionCompactionStats(c);
}
*made_progress = true;
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:AfterCompaction",
c->column_family_data());
} else if (!trivial_move_disallowed && c->IsTrivialMove()) {
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:TrivialMove");
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:BeforeCompaction",
c->column_family_data());
// Instrument for event update
// TODO(yhchiang): add op details for showing trivial-move.
ThreadStatusUtil::SetColumnFamily(c->column_family_data());
ThreadStatusUtil::SetThreadOperation(ThreadStatus::OP_COMPACTION);
compaction_job_stats.num_input_files = c->num_input_files(0);
NotifyOnCompactionBegin(c->column_family_data(), c.get(), status,
compaction_job_stats, job_context->job_id);
// Move files to next level
int32_t moved_files = 0;
int64_t moved_bytes = 0;
for (unsigned int l = 0; l < c->num_input_levels(); l++) {
if (c->level(l) == c->output_level()) {
continue;
}
for (size_t i = 0; i < c->num_input_files(l); i++) {
FileMetaData* f = c->input(l, i);
c->edit()->DeleteFile(c->level(l), f->fd.GetNumber());
c->edit()->AddFile(
c->output_level(), f->fd.GetNumber(), f->fd.GetPathId(),
f->fd.GetFileSize(), f->smallest, f->largest, f->fd.smallest_seqno,
f->fd.largest_seqno, f->marked_for_compaction, f->temperature,
f->oldest_blob_file_number, f->oldest_ancester_time,
f->file_creation_time, f->epoch_number, f->file_checksum,
f->file_checksum_func_name, f->unique_id,
f->compensated_range_deletion_size, f->tail_size,
f->user_defined_timestamps_persisted);
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Moving #%" PRIu64 " to level-%d %" PRIu64 " bytes\n",
c->column_family_data()->GetName().c_str(), f->fd.GetNumber(),
c->output_level(), f->fd.GetFileSize());
++moved_files;
moved_bytes += f->fd.GetFileSize();
}
}
if (c->compaction_reason() == CompactionReason::kLevelMaxLevelSize &&
c->immutable_options()->compaction_pri == kRoundRobin) {
int start_level = c->start_level();
if (start_level > 0) {
auto vstorage = c->input_version()->storage_info();
c->edit()->AddCompactCursor(
start_level,
vstorage->GetNextCompactCursor(start_level, c->num_input_files(0)));
}
}
status = versions_->LogAndApply(
c->column_family_data(), *c->mutable_cf_options(), read_options,
write_options, c->edit(), &mutex_, directories_.GetDbDir(),
/*new_descriptor_log=*/false, /*column_family_options=*/nullptr,
[&c, &compaction_released](const Status& s) {
c->ReleaseCompactionFiles(s);
compaction_released = true;
});
io_s = versions_->io_status();
// Use latest MutableCFOptions
InstallSuperVersionAndScheduleWork(
c->column_family_data(), job_context->superversion_contexts.data(),
*c->mutable_cf_options());
VersionStorageInfo::LevelSummaryStorage tmp;
c->column_family_data()->internal_stats()->IncBytesMoved(c->output_level(),
moved_bytes);
{
event_logger_.LogToBuffer(log_buffer)
<< "job" << job_context->job_id << "event"
<< "trivial_move"
<< "destination_level" << c->output_level() << "files" << moved_files
<< "total_files_size" << moved_bytes;
}
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] Moved #%d files to level-%d %" PRIu64 " bytes %s: %s\n",
c->column_family_data()->GetName().c_str(), moved_files,
c->output_level(), moved_bytes, status.ToString().c_str(),
c->column_family_data()->current()->storage_info()->LevelSummary(&tmp));
*made_progress = true;
// Clear Instrument
ThreadStatusUtil::ResetThreadStatus();
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:AfterCompaction",
c->column_family_data());
} else if (!is_prepicked && c->output_level() > 0 &&
c->output_level() ==
c->column_family_data()
->current()
->storage_info()
->MaxOutputLevel(
immutable_db_options_.allow_ingest_behind) &&
env_->GetBackgroundThreads(Env::Priority::BOTTOM) > 0) {
// Forward compactions involving last level to the bottom pool if it exists,
// such that compactions unlikely to contribute to write stalls can be
// delayed or deprioritized.
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:ForwardToBottomPriPool");
CompactionArg* ca = new CompactionArg;
ca->db = this;
ca->compaction_pri_ = Env::Priority::BOTTOM;
ca->prepicked_compaction = new PrepickedCompaction;
ca->prepicked_compaction->compaction = c.release();
ca->prepicked_compaction->manual_compaction_state = nullptr;
// Transfer requested token, so it doesn't need to do it again.
ca->prepicked_compaction->task_token = std::move(task_token);
++bg_bottom_compaction_scheduled_;
assert(c == nullptr);
env_->Schedule(&DBImpl::BGWorkBottomCompaction, ca, Env::Priority::BOTTOM,
this, &DBImpl::UnscheduleCompactionCallback);
} else {
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:BeforeCompaction",
c->column_family_data());
int output_level __attribute__((__unused__));
output_level = c->output_level();
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:NonTrivial",
&output_level);
std::vector<SequenceNumber> snapshot_seqs;
SequenceNumber earliest_write_conflict_snapshot;
SnapshotChecker* snapshot_checker;
GetSnapshotContext(job_context, &snapshot_seqs,
&earliest_write_conflict_snapshot, &snapshot_checker);
assert(is_snapshot_supported_ || snapshots_.empty());
CompactionJob compaction_job(
job_context->job_id, c.get(), immutable_db_options_,
mutable_db_options_, file_options_for_compaction_, versions_.get(),
&shutting_down_, log_buffer, directories_.GetDbDir(),
GetDataDir(c->column_family_data(), c->output_path_id()),
GetDataDir(c->column_family_data(), 0), stats_, &mutex_,
&error_handler_, snapshot_seqs, earliest_write_conflict_snapshot,
snapshot_checker, job_context, table_cache_, &event_logger_,
c->mutable_cf_options()->paranoid_file_checks,
c->mutable_cf_options()->report_bg_io_stats, dbname_,
&compaction_job_stats, thread_pri, io_tracer_,
is_manual ? manual_compaction->canceled
: kManualCompactionCanceledFalse_,
db_id_, db_session_id_, c->column_family_data()->GetFullHistoryTsLow(),
c->trim_ts(), &blob_callback_, &bg_compaction_scheduled_,
&bg_bottom_compaction_scheduled_);
compaction_job.Prepare();
NotifyOnCompactionBegin(c->column_family_data(), c.get(), status,
compaction_job_stats, job_context->job_id);
mutex_.Unlock();
TEST_SYNC_POINT_CALLBACK(
"DBImpl::BackgroundCompaction:NonTrivial:BeforeRun", nullptr);
// Should handle error?
compaction_job.Run().PermitUncheckedError();
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:NonTrivial:AfterRun");
mutex_.Lock();
status =
compaction_job.Install(*c->mutable_cf_options(), &compaction_released);
io_s = compaction_job.io_status();
if (status.ok()) {
InstallSuperVersionAndScheduleWork(
c->column_family_data(), job_context->superversion_contexts.data(),
*c->mutable_cf_options());
}
*made_progress = true;
TEST_SYNC_POINT_CALLBACK("DBImpl::BackgroundCompaction:AfterCompaction",
c->column_family_data());
}
if (status.ok() && !io_s.ok()) {
status = io_s;
} else {
io_s.PermitUncheckedError();
}
if (c != nullptr) {
if (!compaction_released) {
c->ReleaseCompactionFiles(status);
} else {
#ifndef NDEBUG
// Sanity checking that compaction files are freed.
for (size_t i = 0; i < c->num_input_levels(); i++) {
for (size_t j = 0; j < c->inputs(i)->size(); j++) {
assert(!c->input(i, j)->being_compacted);
}
}
std::unordered_set<Compaction*>* cip = c->column_family_data()
->compaction_picker()
->compactions_in_progress();
assert(cip->find(c.get()) == cip->end());
#endif
}
*made_progress = true;
// Need to make sure SstFileManager does its bookkeeping
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
if (sfm && sfm_reserved_compact_space) {
sfm->OnCompactionCompletion(c.get());
}
NotifyOnCompactionCompleted(c->column_family_data(), c.get(), status,
compaction_job_stats, job_context->job_id);
}
if (status.ok() || status.IsCompactionTooLarge() ||
status.IsManualCompactionPaused()) {
// Done
} else if (status.IsColumnFamilyDropped() || status.IsShutdownInProgress()) {
// Ignore compaction errors found during shutting down
} else {
ROCKS_LOG_WARN(immutable_db_options_.info_log, "Compaction error: %s",
status.ToString().c_str());
if (!io_s.ok()) {
// Error while writing to MANIFEST.
// In fact, versions_->io_status() can also be the result of renaming
// CURRENT file. With current code, it's just difficult to tell. So just
// be pessimistic and try write to a new MANIFEST.
// TODO: distinguish between MANIFEST write and CURRENT renaming
auto err_reason = versions_->io_status().ok()
? BackgroundErrorReason::kCompaction
: BackgroundErrorReason::kManifestWrite;
error_handler_.SetBGError(io_s, err_reason);
} else {
error_handler_.SetBGError(status, BackgroundErrorReason::kCompaction);
}
if (c != nullptr && !is_manual && !error_handler_.IsBGWorkStopped()) {
// Put this cfd back in the compaction queue so we can retry after some
// time
auto cfd = c->column_family_data();
assert(cfd != nullptr);
// Since this compaction failed, we need to recompute the score so it
// takes the original input files into account
c->column_family_data()
->current()
->storage_info()
->ComputeCompactionScore(*(c->immutable_options()),
*(c->mutable_cf_options()));
if (!cfd->queued_for_compaction()) {
AddToCompactionQueue(cfd);
++unscheduled_compactions_;
}
}
}
// this will unref its input_version and column_family_data
c.reset();
if (is_manual) {
ManualCompactionState* m = manual_compaction;
if (!status.ok()) {
m->status = status;
m->done = true;
}
// For universal compaction:
// Because universal compaction always happens at level 0, so one
// compaction will pick up all overlapped files. No files will be
// filtered out due to size limit and left for a successive compaction.
// So we can safely conclude the current compaction.
//
// Also note that, if we don't stop here, then the current compaction
// writes a new file back to level 0, which will be used in successive
// compaction. Hence the manual compaction will never finish.
//
// Stop the compaction if manual_end points to nullptr -- this means
// that we compacted the whole range. manual_end should always point
// to nullptr in case of universal compaction
if (m->manual_end == nullptr) {
m->done = true;
}
if (!m->done) {
// We only compacted part of the requested range. Update *m
// to the range that is left to be compacted.
// Universal and FIFO compactions should always compact the whole range
assert(m->cfd->ioptions()->compaction_style !=
kCompactionStyleUniversal ||
m->cfd->ioptions()->num_levels > 1);
assert(m->cfd->ioptions()->compaction_style != kCompactionStyleFIFO);
m->tmp_storage = *m->manual_end;
m->begin = &m->tmp_storage;
m->incomplete = true;
}
m->in_progress = false; // not being processed anymore
}
TEST_SYNC_POINT("DBImpl::BackgroundCompaction:Finish");
return status;
}
bool DBImpl::HasPendingManualCompaction() {
return (!manual_compaction_dequeue_.empty());
}
void DBImpl::AddManualCompaction(DBImpl::ManualCompactionState* m) {
assert(manual_compaction_paused_ == 0);
manual_compaction_dequeue_.push_back(m);
}
void DBImpl::RemoveManualCompaction(DBImpl::ManualCompactionState* m) {
// Remove from queue
std::deque<ManualCompactionState*>::iterator it =
manual_compaction_dequeue_.begin();
while (it != manual_compaction_dequeue_.end()) {
if (m == (*it)) {
it = manual_compaction_dequeue_.erase(it);
return;
}
++it;
}
assert(false);
}
bool DBImpl::ShouldntRunManualCompaction(ManualCompactionState* m) {
if (m->exclusive) {
return (bg_bottom_compaction_scheduled_ > 0 ||
bg_compaction_scheduled_ > 0);
}
std::deque<ManualCompactionState*>::iterator it =
manual_compaction_dequeue_.begin();
bool seen = false;
while (it != manual_compaction_dequeue_.end()) {
if (m == (*it)) {
++it;
seen = true;
continue;
} else if (MCOverlap(m, (*it)) && (!seen && !(*it)->in_progress)) {
// Consider the other manual compaction *it, conflicts if:
// overlaps with m
// and (*it) is ahead in the queue and is not yet in progress
return true;
}
++it;
}
return false;
}
bool DBImpl::HaveManualCompaction(ColumnFamilyData* cfd) {
// Remove from priority queue
std::deque<ManualCompactionState*>::iterator it =
manual_compaction_dequeue_.begin();
while (it != manual_compaction_dequeue_.end()) {
if ((*it)->exclusive) {
return true;
}
if ((cfd == (*it)->cfd) && (!((*it)->in_progress || (*it)->done))) {
// Allow automatic compaction if manual compaction is
// in progress
return true;
}
++it;
}
return false;
}
bool DBImpl::HasExclusiveManualCompaction() {
// Remove from priority queue
std::deque<ManualCompactionState*>::iterator it =
manual_compaction_dequeue_.begin();
while (it != manual_compaction_dequeue_.end()) {
if ((*it)->exclusive) {
return true;
}
++it;
}
return false;
}
bool DBImpl::MCOverlap(ManualCompactionState* m, ManualCompactionState* m1) {
if ((m->exclusive) || (m1->exclusive)) {
return true;
}
if (m->cfd != m1->cfd) {
return false;
}
return false;
}
void DBImpl::UpdateDeletionCompactionStats(
const std::unique_ptr<Compaction>& c) {
if (c == nullptr) {
return;
}
CompactionReason reason = c->compaction_reason();
switch (reason) {
case CompactionReason::kFIFOMaxSize:
RecordTick(stats_, FIFO_MAX_SIZE_COMPACTIONS);
break;
case CompactionReason::kFIFOTtl:
RecordTick(stats_, FIFO_TTL_COMPACTIONS);
break;
default:
assert(false);
break;
}
}
void DBImpl::BuildCompactionJobInfo(
const ColumnFamilyData* cfd, Compaction* c, const Status& st,
const CompactionJobStats& compaction_job_stats, const int job_id,
CompactionJobInfo* compaction_job_info) const {
assert(compaction_job_info != nullptr);
compaction_job_info->cf_id = cfd->GetID();
compaction_job_info->cf_name = cfd->GetName();
compaction_job_info->status = st;
compaction_job_info->thread_id = env_->GetThreadID();
compaction_job_info->job_id = job_id;
compaction_job_info->base_input_level = c->start_level();
compaction_job_info->output_level = c->output_level();
compaction_job_info->stats = compaction_job_stats;
const auto& input_table_properties = c->GetInputTableProperties();
const auto& output_table_properties = c->GetOutputTableProperties();
compaction_job_info->table_properties.insert(input_table_properties.begin(),
input_table_properties.end());
compaction_job_info->table_properties.insert(output_table_properties.begin(),
output_table_properties.end());
compaction_job_info->compaction_reason = c->compaction_reason();
compaction_job_info->compression = c->output_compression();
const ReadOptions read_options(Env::IOActivity::kCompaction);
for (size_t i = 0; i < c->num_input_levels(); ++i) {
for (const auto fmd : *c->inputs(i)) {
const FileDescriptor& desc = fmd->fd;
const uint64_t file_number = desc.GetNumber();
auto fn = TableFileName(c->immutable_options()->cf_paths, file_number,
desc.GetPathId());
compaction_job_info->input_files.push_back(fn);
compaction_job_info->input_file_infos.push_back(CompactionFileInfo{
static_cast<int>(i), file_number, fmd->oldest_blob_file_number});
}
}
for (const auto& newf : c->edit()->GetNewFiles()) {
const FileMetaData& meta = newf.second;
const FileDescriptor& desc = meta.fd;
const uint64_t file_number = desc.GetNumber();
compaction_job_info->output_files.push_back(TableFileName(
c->immutable_options()->cf_paths, file_number, desc.GetPathId()));
compaction_job_info->output_file_infos.push_back(CompactionFileInfo{
newf.first, file_number, meta.oldest_blob_file_number});
}
compaction_job_info->blob_compression_type =
c->mutable_cf_options()->blob_compression_type;
// Update BlobFilesInfo.
for (const auto& blob_file : c->edit()->GetBlobFileAdditions()) {
BlobFileAdditionInfo blob_file_addition_info(
BlobFileName(c->immutable_options()->cf_paths.front().path,
blob_file.GetBlobFileNumber()) /*blob_file_path*/,
blob_file.GetBlobFileNumber(), blob_file.GetTotalBlobCount(),
blob_file.GetTotalBlobBytes());
compaction_job_info->blob_file_addition_infos.emplace_back(
std::move(blob_file_addition_info));
}
// Update BlobFilesGarbageInfo.
for (const auto& blob_file : c->edit()->GetBlobFileGarbages()) {
BlobFileGarbageInfo blob_file_garbage_info(
BlobFileName(c->immutable_options()->cf_paths.front().path,
blob_file.GetBlobFileNumber()) /*blob_file_path*/,
blob_file.GetBlobFileNumber(), blob_file.GetGarbageBlobCount(),
blob_file.GetGarbageBlobBytes());
compaction_job_info->blob_file_garbage_infos.emplace_back(
std::move(blob_file_garbage_info));
}
}
// SuperVersionContext gets created and destructed outside of the lock --
// we use this conveniently to:
// * malloc one SuperVersion() outside of the lock -- new_superversion
// * delete SuperVersion()s outside of the lock -- superversions_to_free
//
// However, if InstallSuperVersionAndScheduleWork() gets called twice with the
// same sv_context, we can't reuse the SuperVersion() that got
// malloced because
// first call already used it. In that rare case, we take a hit and create a
// new SuperVersion() inside of the mutex. We do similar thing
// for superversion_to_free
void DBImpl::InstallSuperVersionAndScheduleWork(
ColumnFamilyData* cfd, SuperVersionContext* sv_context,
const MutableCFOptions& mutable_cf_options) {
mutex_.AssertHeld();
// Update max_total_in_memory_state_
size_t old_memtable_size = 0;
auto* old_sv = cfd->GetSuperVersion();
if (old_sv) {
old_memtable_size = old_sv->mutable_cf_options.write_buffer_size *
old_sv->mutable_cf_options.max_write_buffer_number;
}
// this branch is unlikely to step in
if (UNLIKELY(sv_context->new_superversion == nullptr)) {
sv_context->NewSuperVersion();
}
cfd->InstallSuperVersion(sv_context, mutable_cf_options);
// There may be a small data race here. The snapshot tricking bottommost
// compaction may already be released here. But assuming there will always be
// newer snapshot created and released frequently, the compaction will be
// triggered soon anyway.
bottommost_files_mark_threshold_ = kMaxSequenceNumber;
for (auto* my_cfd : *versions_->GetColumnFamilySet()) {
if (!my_cfd->ioptions()->allow_ingest_behind) {
bottommost_files_mark_threshold_ = std::min(
bottommost_files_mark_threshold_,
my_cfd->current()->storage_info()->bottommost_files_mark_threshold());
}
}
// Whenever we install new SuperVersion, we might need to issue new flushes or
// compactions.
SchedulePendingCompaction(cfd);
MaybeScheduleFlushOrCompaction();
// Update max_total_in_memory_state_
max_total_in_memory_state_ = max_total_in_memory_state_ - old_memtable_size +
mutable_cf_options.write_buffer_size *
mutable_cf_options.max_write_buffer_number;
}
// ShouldPurge is called by FindObsoleteFiles when doing a full scan,
// and db mutex (mutex_) should already be held.
// Actually, the current implementation of FindObsoleteFiles with
// full_scan=true can issue I/O requests to obtain list of files in
// directories, e.g. env_->getChildren while holding db mutex.
bool DBImpl::ShouldPurge(uint64_t file_number) const {
return files_grabbed_for_purge_.find(file_number) ==
files_grabbed_for_purge_.end() &&
purge_files_.find(file_number) == purge_files_.end();
}
// MarkAsGrabbedForPurge is called by FindObsoleteFiles, and db mutex
// (mutex_) should already be held.
void DBImpl::MarkAsGrabbedForPurge(uint64_t file_number) {
files_grabbed_for_purge_.insert(file_number);
}
void DBImpl::SetSnapshotChecker(SnapshotChecker* snapshot_checker) {
InstrumentedMutexLock l(&mutex_);
// snapshot_checker_ should only set once. If we need to set it multiple
// times, we need to make sure the old one is not deleted while it is still
// using by a compaction job.
assert(!snapshot_checker_);
snapshot_checker_.reset(snapshot_checker);
}
void DBImpl::GetSnapshotContext(
JobContext* job_context, std::vector<SequenceNumber>* snapshot_seqs,
SequenceNumber* earliest_write_conflict_snapshot,
SnapshotChecker** snapshot_checker_ptr) {
mutex_.AssertHeld();
assert(job_context != nullptr);
assert(snapshot_seqs != nullptr);
assert(earliest_write_conflict_snapshot != nullptr);
assert(snapshot_checker_ptr != nullptr);
*snapshot_checker_ptr = snapshot_checker_.get();
if (use_custom_gc_ && *snapshot_checker_ptr == nullptr) {
*snapshot_checker_ptr = DisableGCSnapshotChecker::Instance();
}
if (*snapshot_checker_ptr != nullptr) {
// If snapshot_checker is used, that means the flush/compaction may
// contain values not visible to snapshot taken after
// flush/compaction job starts. Take a snapshot and it will appear
// in snapshot_seqs and force compaction iterator to consider such
// snapshots.
const Snapshot* job_snapshot =
GetSnapshotImpl(false /*write_conflict_boundary*/, false /*lock*/);
job_context->job_snapshot.reset(new ManagedSnapshot(this, job_snapshot));
}
*snapshot_seqs = snapshots_.GetAll(earliest_write_conflict_snapshot);
}
Status DBImpl::WaitForCompact(
const WaitForCompactOptions& wait_for_compact_options) {
InstrumentedMutexLock l(&mutex_);
if (wait_for_compact_options.flush) {
Status s = DBImpl::FlushAllColumnFamilies(FlushOptions(),
FlushReason::kManualFlush);
if (!s.ok()) {
return s;
}
} else if (wait_for_compact_options.close_db &&
has_unpersisted_data_.load(std::memory_order_relaxed) &&
!mutable_db_options_.avoid_flush_during_shutdown) {
Status s =
DBImpl::FlushAllColumnFamilies(FlushOptions(), FlushReason::kShutDown);
if (!s.ok()) {
return s;
}
}
TEST_SYNC_POINT("DBImpl::WaitForCompact:StartWaiting");
const auto deadline = immutable_db_options_.clock->NowMicros() +
wait_for_compact_options.timeout.count();
for (;;) {
if (shutting_down_.load(std::memory_order_acquire)) {
return Status::ShutdownInProgress();
}
if (bg_work_paused_ && wait_for_compact_options.abort_on_pause) {
return Status::Aborted();
}
if ((bg_bottom_compaction_scheduled_ || bg_compaction_scheduled_ ||
bg_flush_scheduled_ || unscheduled_compactions_ ||
unscheduled_flushes_ || error_handler_.IsRecoveryInProgress()) &&
(error_handler_.GetBGError().ok())) {
if (wait_for_compact_options.timeout.count()) {
if (bg_cv_.TimedWait(deadline)) {
return Status::TimedOut();
}
} else {
bg_cv_.Wait();
}
} else if (wait_for_compact_options.close_db) {
reject_new_background_jobs_ = true;
mutex_.Unlock();
Status s = Close();
mutex_.Lock();
if (!s.ok()) {
reject_new_background_jobs_ = false;
}
return s;
} else {
return error_handler_.GetBGError();
}
}
}
} // namespace ROCKSDB_NAMESPACE
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