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db_impl_compaction_flush.cc
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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 "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(JobContext* job_context,
VersionEdit* synced_wals) {
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_handler_.IsRecoveryInProgress()) {
log->file()->reset_seen_error();
}
io_s = log->file()->Sync(immutable_db_options_.use_fsync);
if (!io_s.ok()) {
break;
}
if (immutable_db_options_.recycle_log_file_num > 0) {
if (error_handler_.IsRecoveryInProgress()) {
log->file()->reset_seen_error();
}
io_s = log->Close();
if (!io_s.ok()) {
break;
}
}
}
if (io_s.ok()) {
io_s = directories_.GetWalDir()->FsyncWithDirOptions(
IOOptions(), 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());
// 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()
: 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 snapshto 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_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;
mutex_.Unlock();
log_io_s = SyncClosedLogs(job_context, &synced_wals);
mutex_.Lock();
if (log_io_s.ok() && synced_wals.IsWalAddition()) {
const ReadOptions read_options(Env::IOActivity::kFlush);
log_io_s =
status_to_io_status(ApplyWALToManifest(read_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");
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);
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()) {
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();
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_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;
mutex_.Unlock();
log_io_s = SyncClosedLogs(job_context, &synced_wals);
mutex_.Lock();
if (log_io_s.ok() && synced_wals.IsWalAddition()) {
const ReadOptions read_options(Env::IOActivity::kFlush);
log_io_s =
status_to_io_status(ApplyWALToManifest(read_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);
}
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) {
Status error_status = dir->FsyncWithDirOptions(
IOOptions(), nullptr,
DirFsyncOptions(DirFsyncOptions::FsyncReason::kNewFileSynced));
if (!error_status.ok()) {
s = error_status;
break;
}
}
}
} else {
// 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,
file_meta[i].fd.GetNumber());
}
}
}
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() ||
(bg_flush_args[0].flush_reason_ == FlushReason::kErrorRecovery ||
bg_flush_args[0].flush_reason_ ==
FlushReason::kErrorRecoveryRetryFlush);
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) {
break;
}
atomic_flush_install_cv_.Wait();
resuming_from_bg_err =
error_handler_.IsDBStopped() ||
(bg_flush_args[0].flush_reason_ == FlushReason::kErrorRecovery ||
bg_flush_args[0].flush_reason_ ==
FlushReason::kErrorRecoveryRetryFlush);
}
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();
}
}
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()) {
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 (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 (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
const ReadOptions read_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");
}