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db_impl.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 "db/db_impl/db_impl.h"
#include <stdint.h>
#ifdef OS_SOLARIS
#include <alloca.h>
#endif
#include <cinttypes>
#include <cstdio>
#include <map>
#include <set>
#include <sstream>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
#include "db/arena_wrapped_db_iter.h"
#include "db/builder.h"
#include "db/compaction/compaction_job.h"
#include "db/convenience_impl.h"
#include "db/db_info_dumper.h"
#include "db/db_iter.h"
#include "db/dbformat.h"
#include "db/error_handler.h"
#include "db/event_helpers.h"
#include "db/external_sst_file_ingestion_job.h"
#include "db/flush_job.h"
#include "db/forward_iterator.h"
#include "db/import_column_family_job.h"
#include "db/job_context.h"
#include "db/log_reader.h"
#include "db/log_writer.h"
#include "db/malloc_stats.h"
#include "db/memtable.h"
#include "db/memtable_list.h"
#include "db/merge_context.h"
#include "db/merge_helper.h"
#include "db/periodic_task_scheduler.h"
#include "db/range_tombstone_fragmenter.h"
#include "db/table_cache.h"
#include "db/table_properties_collector.h"
#include "db/transaction_log_impl.h"
#include "db/version_set.h"
#include "db/write_batch_internal.h"
#include "db/write_callback.h"
#include "env/unique_id_gen.h"
#include "file/file_util.h"
#include "file/filename.h"
#include "file/random_access_file_reader.h"
#include "file/sst_file_manager_impl.h"
#include "logging/auto_roll_logger.h"
#include "logging/log_buffer.h"
#include "logging/logging.h"
#include "monitoring/in_memory_stats_history.h"
#include "monitoring/instrumented_mutex.h"
#include "monitoring/iostats_context_imp.h"
#include "monitoring/perf_context_imp.h"
#include "monitoring/persistent_stats_history.h"
#include "monitoring/thread_status_updater.h"
#include "monitoring/thread_status_util.h"
#include "options/cf_options.h"
#include "options/options_helper.h"
#include "options/options_parser.h"
#include "port/port.h"
#include "rocksdb/cache.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/statistics.h"
#include "rocksdb/stats_history.h"
#include "rocksdb/status.h"
#include "rocksdb/table.h"
#include "rocksdb/version.h"
#include "rocksdb/write_buffer_manager.h"
#include "table/block_based/block.h"
#include "table/block_based/block_based_table_factory.h"
#include "table/get_context.h"
#include "table/merging_iterator.h"
#include "table/multiget_context.h"
#include "table/sst_file_dumper.h"
#include "table/table_builder.h"
#include "table/two_level_iterator.h"
#include "table/unique_id_impl.h"
#include "test_util/sync_point.h"
#include "trace_replay/trace_replay.h"
#include "util/autovector.h"
#include "util/cast_util.h"
#include "util/coding.h"
#include "util/compression.h"
#include "util/crc32c.h"
#include "util/defer.h"
#include "util/distributed_mutex.h"
#include "util/hash_containers.h"
#include "util/mutexlock.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
#include "util/udt_util.h"
#include "utilities/trace/replayer_impl.h"
namespace ROCKSDB_NAMESPACE {
const std::string kDefaultColumnFamilyName("default");
const std::string kPersistentStatsColumnFamilyName(
"___rocksdb_stats_history___");
void DumpRocksDBBuildVersion(Logger* log);
CompressionType GetCompressionFlush(
const ImmutableCFOptions& ioptions,
const MutableCFOptions& mutable_cf_options) {
// Compressing memtable flushes might not help unless the sequential load
// optimization is used for leveled compaction. Otherwise the CPU and
// latency overhead is not offset by saving much space.
if (ioptions.compaction_style == kCompactionStyleUniversal &&
mutable_cf_options.compaction_options_universal
.compression_size_percent >= 0) {
return kNoCompression;
}
if (mutable_cf_options.compression_per_level.empty()) {
return mutable_cf_options.compression;
} else {
// For leveled compress when min_level_to_compress != 0.
return mutable_cf_options.compression_per_level[0];
}
}
namespace {
void DumpSupportInfo(Logger* logger) {
ROCKS_LOG_HEADER(logger, "Compression algorithms supported:");
for (auto& compression : OptionsHelper::compression_type_string_map) {
if (compression.second != kNoCompression &&
compression.second != kDisableCompressionOption) {
ROCKS_LOG_HEADER(logger, "\t%s supported: %d", compression.first.c_str(),
CompressionTypeSupported(compression.second));
}
}
ROCKS_LOG_HEADER(logger, "Fast CRC32 supported: %s",
crc32c::IsFastCrc32Supported().c_str());
ROCKS_LOG_HEADER(logger, "DMutex implementation: %s", DMutex::kName());
}
} // namespace
DBImpl::DBImpl(const DBOptions& options, const std::string& dbname,
const bool seq_per_batch, const bool batch_per_txn,
bool read_only)
: dbname_(dbname),
own_info_log_(options.info_log == nullptr),
init_logger_creation_s_(),
initial_db_options_(SanitizeOptions(dbname, options, read_only,
&init_logger_creation_s_)),
env_(initial_db_options_.env),
io_tracer_(std::make_shared<IOTracer>()),
immutable_db_options_(initial_db_options_),
fs_(immutable_db_options_.fs, io_tracer_),
mutable_db_options_(initial_db_options_),
stats_(immutable_db_options_.stats),
#ifdef COERCE_CONTEXT_SWITCH
mutex_(stats_, immutable_db_options_.clock, DB_MUTEX_WAIT_MICROS, &bg_cv_,
immutable_db_options_.use_adaptive_mutex),
#else // COERCE_CONTEXT_SWITCH
mutex_(stats_, immutable_db_options_.clock, DB_MUTEX_WAIT_MICROS,
immutable_db_options_.use_adaptive_mutex),
#endif // COERCE_CONTEXT_SWITCH
default_cf_handle_(nullptr),
error_handler_(this, immutable_db_options_, &mutex_),
event_logger_(immutable_db_options_.info_log.get()),
max_total_in_memory_state_(0),
file_options_(BuildDBOptions(immutable_db_options_, mutable_db_options_)),
file_options_for_compaction_(fs_->OptimizeForCompactionTableWrite(
file_options_, immutable_db_options_)),
seq_per_batch_(seq_per_batch),
batch_per_txn_(batch_per_txn),
next_job_id_(1),
shutting_down_(false),
reject_new_background_jobs_(false),
db_lock_(nullptr),
manual_compaction_paused_(false),
bg_cv_(&mutex_),
logfile_number_(0),
log_dir_synced_(false),
log_empty_(true),
persist_stats_cf_handle_(nullptr),
log_sync_cv_(&log_write_mutex_),
total_log_size_(0),
is_snapshot_supported_(true),
write_buffer_manager_(immutable_db_options_.write_buffer_manager.get()),
write_thread_(immutable_db_options_),
nonmem_write_thread_(immutable_db_options_),
write_controller_(mutable_db_options_.delayed_write_rate),
last_batch_group_size_(0),
unscheduled_flushes_(0),
unscheduled_compactions_(0),
bg_bottom_compaction_scheduled_(0),
bg_compaction_scheduled_(0),
num_running_compactions_(0),
bg_flush_scheduled_(0),
num_running_flushes_(0),
bg_purge_scheduled_(0),
disable_delete_obsolete_files_(0),
pending_purge_obsolete_files_(0),
delete_obsolete_files_last_run_(immutable_db_options_.clock->NowMicros()),
has_unpersisted_data_(false),
unable_to_release_oldest_log_(false),
num_running_ingest_file_(0),
wal_manager_(immutable_db_options_, file_options_, io_tracer_,
seq_per_batch),
bg_work_paused_(0),
bg_compaction_paused_(0),
refitting_level_(false),
opened_successfully_(false),
periodic_task_scheduler_(),
two_write_queues_(options.two_write_queues),
manual_wal_flush_(options.manual_wal_flush),
// last_sequencee_ is always maintained by the main queue that also writes
// to the memtable. When two_write_queues_ is disabled last seq in
// memtable is the same as last seq published to the readers. When it is
// enabled but seq_per_batch_ is disabled, last seq in memtable still
// indicates last published seq since wal-only writes that go to the 2nd
// queue do not consume a sequence number. Otherwise writes performed by
// the 2nd queue could change what is visible to the readers. In this
// cases, last_seq_same_as_publish_seq_==false, the 2nd queue maintains a
// separate variable to indicate the last published sequence.
last_seq_same_as_publish_seq_(
!(seq_per_batch && options.two_write_queues)),
// Since seq_per_batch_ is currently set only by WritePreparedTxn which
// requires a custom gc for compaction, we use that to set use_custom_gc_
// as well.
use_custom_gc_(seq_per_batch),
shutdown_initiated_(false),
own_sfm_(options.sst_file_manager == nullptr),
closed_(false),
atomic_flush_install_cv_(&mutex_),
blob_callback_(immutable_db_options_.sst_file_manager.get(), &mutex_,
&error_handler_, &event_logger_,
immutable_db_options_.listeners, dbname_),
lock_wal_count_(0) {
// !batch_per_trx_ implies seq_per_batch_ because it is only unset for
// WriteUnprepared, which should use seq_per_batch_.
assert(batch_per_txn_ || seq_per_batch_);
// Reserve ten files or so for other uses and give the rest to TableCache.
// Give a large number for setting of "infinite" open files.
const int table_cache_size = (mutable_db_options_.max_open_files == -1)
? TableCache::kInfiniteCapacity
: mutable_db_options_.max_open_files - 10;
LRUCacheOptions co;
co.capacity = table_cache_size;
co.num_shard_bits = immutable_db_options_.table_cache_numshardbits;
co.metadata_charge_policy = kDontChargeCacheMetadata;
// TODO: Consider a non-fixed seed once test fallout (prefetch_test) is
// dealt with
co.hash_seed = 0;
table_cache_ = NewLRUCache(co);
SetDbSessionId();
assert(!db_session_id_.empty());
periodic_task_functions_.emplace(PeriodicTaskType::kDumpStats,
[this]() { this->DumpStats(); });
periodic_task_functions_.emplace(PeriodicTaskType::kPersistStats,
[this]() { this->PersistStats(); });
periodic_task_functions_.emplace(PeriodicTaskType::kFlushInfoLog,
[this]() { this->FlushInfoLog(); });
periodic_task_functions_.emplace(
PeriodicTaskType::kRecordSeqnoTime, [this]() {
this->RecordSeqnoToTimeMapping(/*populate_historical_seconds=*/0);
});
versions_.reset(new VersionSet(
dbname_, &immutable_db_options_, file_options_, table_cache_.get(),
write_buffer_manager_, &write_controller_, &block_cache_tracer_,
io_tracer_, db_id_, db_session_id_, options.daily_offpeak_time_utc,
&error_handler_));
column_family_memtables_.reset(
new ColumnFamilyMemTablesImpl(versions_->GetColumnFamilySet()));
DumpRocksDBBuildVersion(immutable_db_options_.info_log.get());
DumpDBFileSummary(immutable_db_options_, dbname_, db_session_id_);
immutable_db_options_.Dump(immutable_db_options_.info_log.get());
mutable_db_options_.Dump(immutable_db_options_.info_log.get());
DumpSupportInfo(immutable_db_options_.info_log.get());
max_total_wal_size_.store(mutable_db_options_.max_total_wal_size,
std::memory_order_relaxed);
if (write_buffer_manager_) {
wbm_stall_.reset(new WBMStallInterface());
}
}
Status DBImpl::Resume() {
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Resuming DB");
InstrumentedMutexLock db_mutex(&mutex_);
if (!error_handler_.IsDBStopped() && !error_handler_.IsBGWorkStopped()) {
// Nothing to do
return Status::OK();
}
if (error_handler_.IsRecoveryInProgress()) {
// Don't allow a mix of manual and automatic recovery
return Status::Busy();
}
mutex_.Unlock();
Status s = error_handler_.RecoverFromBGError(true);
mutex_.Lock();
return s;
}
// This function implements the guts of recovery from a background error. It
// is eventually called for both manual as well as automatic recovery. It does
// the following -
// 1. Wait for currently scheduled background flush/compaction to exit, in
// order to inadvertently causing an error and thinking recovery failed
// 2. Flush memtables if there's any data for all the CFs. This may result
// another error, which will be saved by error_handler_ and reported later
// as the recovery status
// 3. Find and delete any obsolete files
// 4. Schedule compactions if needed for all the CFs. This is needed as the
// flush in the prior step might have been a no-op for some CFs, which
// means a new super version wouldn't have been installed
Status DBImpl::ResumeImpl(DBRecoverContext context) {
mutex_.AssertHeld();
// TODO: plumb Env::IOActivity
const ReadOptions read_options;
WaitForBackgroundWork();
Status s;
if (shutdown_initiated_) {
// Returning shutdown status to SFM during auto recovery will cause it
// to abort the recovery and allow the shutdown to progress
s = Status::ShutdownInProgress();
}
if (s.ok()) {
Status bg_error = error_handler_.GetBGError();
if (bg_error.severity() > Status::Severity::kHardError) {
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"DB resume requested but failed due to Fatal/Unrecoverable error");
s = bg_error;
}
}
// Make sure the IO Status stored in version set is set to OK.
if (s.ok()) {
IOStatus io_s = versions_->io_status();
if (io_s.IsIOError()) {
// If resuming from IOError resulted from MANIFEST write, then assert
// that we must have already set the MANIFEST writer to nullptr during
// clean-up phase MANIFEST writing.
assert(!versions_->descriptor_log_);
// Since we are trying to recover from MANIFEST write error, we need to
// switch to a new MANIFEST anyway. The old MANIFEST can be corrupted.
// Therefore, force writing a dummy version edit because we do not know
// whether there are flush jobs with non-empty data to flush, triggering
// appends to MANIFEST.
VersionEdit edit;
auto cfh =
static_cast_with_check<ColumnFamilyHandleImpl>(default_cf_handle_);
assert(cfh);
ColumnFamilyData* cfd = cfh->cfd();
const MutableCFOptions& cf_opts = *cfd->GetLatestMutableCFOptions();
s = versions_->LogAndApply(cfd, cf_opts, read_options, &edit, &mutex_,
directories_.GetDbDir());
if (!s.ok()) {
io_s = versions_->io_status();
if (!io_s.ok()) {
s = error_handler_.SetBGError(io_s,
BackgroundErrorReason::kManifestWrite);
}
}
}
}
if (s.ok()) {
if (context.flush_reason == FlushReason::kErrorRecoveryRetryFlush) {
s = RetryFlushesForErrorRecovery(FlushReason::kErrorRecoveryRetryFlush,
true /* wait */);
} else {
// We cannot guarantee consistency of the WAL. So force flush Memtables of
// all the column families
FlushOptions flush_opts;
// We allow flush to stall write since we are trying to resume from error.
flush_opts.allow_write_stall = true;
s = FlushAllColumnFamilies(flush_opts, context.flush_reason);
}
if (!s.ok()) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"DB resume requested but failed due to Flush failure [%s]",
s.ToString().c_str());
}
}
if (s.ok()) {
// This will notify and unblock threads waiting for error recovery to
// finish. Those previouly waiting threads can now proceed, which may
// include closing the db.
s = error_handler_.ClearBGError();
} else {
// NOTE: this is needed to pass ASSERT_STATUS_CHECKED
// in the DBSSTTest.DBWithMaxSpaceAllowedRandomized test.
// See https://github.com/facebook/rocksdb/pull/7715#issuecomment-754947952
error_handler_.GetRecoveryError().PermitUncheckedError();
}
JobContext job_context(0);
FindObsoleteFiles(&job_context, true);
mutex_.Unlock();
job_context.manifest_file_number = 1;
if (job_context.HaveSomethingToDelete()) {
PurgeObsoleteFiles(job_context);
}
job_context.Clean();
if (s.ok()) {
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Successfully resumed DB");
} else {
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Failed to resume DB [%s]",
s.ToString().c_str());
}
mutex_.Lock();
// Check for shutdown again before scheduling further compactions,
// since we released and re-acquired the lock above
if (shutdown_initiated_) {
s = Status::ShutdownInProgress();
}
if (s.ok() && context.flush_after_recovery) {
// Since we drop all non-recovery flush requests during recovery,
// and new memtable may fill up during recovery,
// schedule one more round of flush.
Status status = RetryFlushesForErrorRecovery(
FlushReason::kCatchUpAfterErrorRecovery, false /* wait */);
if (!status.ok()) {
// FlushAllColumnFamilies internally should take care of setting
// background error if needed.
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"The catch up flush after successful recovery failed [%s]",
s.ToString().c_str());
}
// FlushAllColumnFamilies releases and re-acquires mutex.
if (shutdown_initiated_) {
s = Status::ShutdownInProgress();
}
}
if (s.ok()) {
for (auto cfd : *versions_->GetColumnFamilySet()) {
SchedulePendingCompaction(cfd);
}
MaybeScheduleFlushOrCompaction();
}
// Wake up any waiters - in this case, it could be the shutdown thread
bg_cv_.SignalAll();
// No need to check BGError again. If something happened, event listener would
// be notified and the operation causing it would have failed
return s;
}
void DBImpl::WaitForBackgroundWork() {
// Wait for background work to finish
while (bg_bottom_compaction_scheduled_ || bg_compaction_scheduled_ ||
bg_flush_scheduled_) {
bg_cv_.Wait();
}
}
// Will lock the mutex_, will wait for completion if wait is true
void DBImpl::CancelAllBackgroundWork(bool wait) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Shutdown: canceling all background work");
Status s = CancelPeriodicTaskScheduler();
s.PermitUncheckedError();
InstrumentedMutexLock l(&mutex_);
if (!shutting_down_.load(std::memory_order_acquire) &&
has_unpersisted_data_.load(std::memory_order_relaxed) &&
!mutable_db_options_.avoid_flush_during_shutdown) {
s = DBImpl::FlushAllColumnFamilies(FlushOptions(), FlushReason::kShutDown);
s.PermitUncheckedError(); //**TODO: What to do on error?
}
shutting_down_.store(true, std::memory_order_release);
bg_cv_.SignalAll();
if (!wait) {
return;
}
WaitForBackgroundWork();
}
Status DBImpl::MaybeReleaseTimestampedSnapshotsAndCheck() {
size_t num_snapshots = 0;
ReleaseTimestampedSnapshotsOlderThan(std::numeric_limits<uint64_t>::max(),
&num_snapshots);
// If there is unreleased snapshot, fail the close call
if (num_snapshots > 0) {
return Status::Aborted("Cannot close DB with unreleased snapshot.");
}
return Status::OK();
}
Status DBImpl::CloseHelper() {
// Guarantee that there is no background error recovery in progress before
// continuing with the shutdown
mutex_.Lock();
shutdown_initiated_ = true;
error_handler_.CancelErrorRecovery();
while (error_handler_.IsRecoveryInProgress()) {
bg_cv_.Wait();
}
mutex_.Unlock();
// Below check is added as recovery_error_ is not checked and it causes crash
// in DBSSTTest.DBWithMaxSpaceAllowedWithBlobFiles when space limit is
// reached.
error_handler_.GetRecoveryError().PermitUncheckedError();
// CancelAllBackgroundWork called with false means we just set the shutdown
// marker. After this we do a variant of the waiting and unschedule work
// (to consider: moving all the waiting into CancelAllBackgroundWork(true))
CancelAllBackgroundWork(false);
// Cancel manual compaction if there's any
if (HasPendingManualCompaction()) {
DisableManualCompaction();
}
mutex_.Lock();
// Unschedule all tasks for this DB
for (uint8_t i = 0; i < static_cast<uint8_t>(TaskType::kCount); i++) {
env_->UnSchedule(GetTaskTag(i), Env::Priority::BOTTOM);
env_->UnSchedule(GetTaskTag(i), Env::Priority::LOW);
env_->UnSchedule(GetTaskTag(i), Env::Priority::HIGH);
}
Status ret = Status::OK();
// Wait for background work to finish
while (bg_bottom_compaction_scheduled_ || bg_compaction_scheduled_ ||
bg_flush_scheduled_ || bg_purge_scheduled_ ||
pending_purge_obsolete_files_ ||
error_handler_.IsRecoveryInProgress()) {
TEST_SYNC_POINT("DBImpl::~DBImpl:WaitJob");
bg_cv_.Wait();
}
TEST_SYNC_POINT_CALLBACK("DBImpl::CloseHelper:PendingPurgeFinished",
&files_grabbed_for_purge_);
EraseThreadStatusDbInfo();
flush_scheduler_.Clear();
trim_history_scheduler_.Clear();
while (!flush_queue_.empty()) {
const FlushRequest& flush_req = PopFirstFromFlushQueue();
for (const auto& iter : flush_req.cfd_to_max_mem_id_to_persist) {
iter.first->UnrefAndTryDelete();
}
}
while (!compaction_queue_.empty()) {
auto cfd = PopFirstFromCompactionQueue();
cfd->UnrefAndTryDelete();
}
if (default_cf_handle_ != nullptr || persist_stats_cf_handle_ != nullptr) {
// we need to delete handle outside of lock because it does its own locking
mutex_.Unlock();
if (default_cf_handle_) {
delete default_cf_handle_;
default_cf_handle_ = nullptr;
}
if (persist_stats_cf_handle_) {
delete persist_stats_cf_handle_;
persist_stats_cf_handle_ = nullptr;
}
mutex_.Lock();
}
// Clean up obsolete files due to SuperVersion release.
// (1) Need to delete to obsolete files before closing because RepairDB()
// scans all existing files in the file system and builds manifest file.
// Keeping obsolete files confuses the repair process.
// (2) Need to check if we Open()/Recover() the DB successfully before
// deleting because if VersionSet recover fails (may be due to corrupted
// manifest file), it is not able to identify live files correctly. As a
// result, all "live" files can get deleted by accident. However, corrupted
// manifest is recoverable by RepairDB().
if (opened_successfully_) {
JobContext job_context(next_job_id_.fetch_add(1));
FindObsoleteFiles(&job_context, true);
mutex_.Unlock();
// manifest number starting from 2
job_context.manifest_file_number = 1;
if (job_context.HaveSomethingToDelete()) {
PurgeObsoleteFiles(job_context);
}
job_context.Clean();
mutex_.Lock();
}
{
InstrumentedMutexLock lock(&log_write_mutex_);
for (auto l : logs_to_free_) {
delete l;
}
for (auto& log : logs_) {
uint64_t log_number = log.writer->get_log_number();
Status s = log.ClearWriter();
if (!s.ok()) {
ROCKS_LOG_WARN(
immutable_db_options_.info_log,
"Unable to Sync WAL file %s with error -- %s",
LogFileName(immutable_db_options_.GetWalDir(), log_number).c_str(),
s.ToString().c_str());
// Retain the first error
if (ret.ok()) {
ret = s;
}
}
}
logs_.clear();
}
// Table cache may have table handles holding blocks from the block cache.
// We need to release them before the block cache is destroyed. The block
// cache may be destroyed inside versions_.reset(), when column family data
// list is destroyed, so leaving handles in table cache after
// versions_.reset() may cause issues.
// Here we clean all unreferenced handles in table cache.
// Now we assume all user queries have finished, so only version set itself
// can possibly hold the blocks from block cache. After releasing unreferenced
// handles here, only handles held by version set left and inside
// versions_.reset(), we will release them. There, we need to make sure every
// time a handle is released, we erase it from the cache too. By doing that,
// we can guarantee that after versions_.reset(), table cache is empty
// so the cache can be safely destroyed.
table_cache_->EraseUnRefEntries();
for (auto& txn_entry : recovered_transactions_) {
delete txn_entry.second;
}
// versions need to be destroyed before table_cache since it can hold
// references to table_cache.
versions_.reset();
mutex_.Unlock();
if (db_lock_ != nullptr) {
// TODO: Check for unlock error
env_->UnlockFile(db_lock_).PermitUncheckedError();
}
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Shutdown complete");
LogFlush(immutable_db_options_.info_log);
// If the sst_file_manager was allocated by us during DB::Open(), ccall
// Close() on it before closing the info_log. Otherwise, background thread
// in SstFileManagerImpl might try to log something
if (immutable_db_options_.sst_file_manager && own_sfm_) {
auto sfm = static_cast<SstFileManagerImpl*>(
immutable_db_options_.sst_file_manager.get());
sfm->Close();
}
if (immutable_db_options_.info_log && own_info_log_) {
Status s = immutable_db_options_.info_log->Close();
if (!s.ok() && !s.IsNotSupported() && ret.ok()) {
ret = s;
}
}
if (write_buffer_manager_ && wbm_stall_) {
write_buffer_manager_->RemoveDBFromQueue(wbm_stall_.get());
}
IOStatus io_s = directories_.Close(IOOptions(), nullptr /* dbg */);
if (!io_s.ok()) {
ret = io_s;
}
if (ret.IsAborted()) {
// Reserve IsAborted() error for those where users didn't release
// certain resource and they can release them and come back and
// retry. In this case, we wrap this exception to something else.
return Status::Incomplete(ret.ToString());
}
return ret;
}
Status DBImpl::CloseImpl() { return CloseHelper(); }
DBImpl::~DBImpl() {
// TODO: remove this.
init_logger_creation_s_.PermitUncheckedError();
InstrumentedMutexLock closing_lock_guard(&closing_mutex_);
if (closed_) {
return;
}
closed_ = true;
{
const Status s = MaybeReleaseTimestampedSnapshotsAndCheck();
s.PermitUncheckedError();
}
closing_status_ = CloseImpl();
closing_status_.PermitUncheckedError();
}
void DBImpl::MaybeIgnoreError(Status* s) const {
if (s->ok() || immutable_db_options_.paranoid_checks) {
// No change needed
} else {
ROCKS_LOG_WARN(immutable_db_options_.info_log, "Ignoring error %s",
s->ToString().c_str());
*s = Status::OK();
}
}
const Status DBImpl::CreateArchivalDirectory() {
if (immutable_db_options_.WAL_ttl_seconds > 0 ||
immutable_db_options_.WAL_size_limit_MB > 0) {
std::string archivalPath =
ArchivalDirectory(immutable_db_options_.GetWalDir());
return env_->CreateDirIfMissing(archivalPath);
}
return Status::OK();
}
void DBImpl::PrintStatistics() {
auto dbstats = immutable_db_options_.stats;
if (dbstats) {
ROCKS_LOG_INFO(immutable_db_options_.info_log, "STATISTICS:\n %s",
dbstats->ToString().c_str());
}
}
Status DBImpl::StartPeriodicTaskScheduler() {
#ifndef NDEBUG
// It only used by test to disable scheduler
bool disable_scheduler = false;
TEST_SYNC_POINT_CALLBACK(
"DBImpl::StartPeriodicTaskScheduler:DisableScheduler",
&disable_scheduler);
if (disable_scheduler) {
return Status::OK();
}
{
InstrumentedMutexLock l(&mutex_);
TEST_SYNC_POINT_CALLBACK("DBImpl::StartPeriodicTaskScheduler:Init",
&periodic_task_scheduler_);
}
#endif // !NDEBUG
if (mutable_db_options_.stats_dump_period_sec > 0) {
Status s = periodic_task_scheduler_.Register(
PeriodicTaskType::kDumpStats,
periodic_task_functions_.at(PeriodicTaskType::kDumpStats),
mutable_db_options_.stats_dump_period_sec);
if (!s.ok()) {
return s;
}
}
if (mutable_db_options_.stats_persist_period_sec > 0) {
Status s = periodic_task_scheduler_.Register(
PeriodicTaskType::kPersistStats,
periodic_task_functions_.at(PeriodicTaskType::kPersistStats),
mutable_db_options_.stats_persist_period_sec);
if (!s.ok()) {
return s;
}
}
Status s = periodic_task_scheduler_.Register(
PeriodicTaskType::kFlushInfoLog,
periodic_task_functions_.at(PeriodicTaskType::kFlushInfoLog));
return s;
}
Status DBImpl::RegisterRecordSeqnoTimeWorker(bool is_new_db) {
options_mutex_.AssertHeld();
uint64_t min_preserve_seconds = std::numeric_limits<uint64_t>::max();
uint64_t max_preserve_seconds = std::numeric_limits<uint64_t>::min();
bool mapping_was_empty = false;
{
InstrumentedMutexLock l(&mutex_);
for (auto cfd : *versions_->GetColumnFamilySet()) {
// preserve time is the max of 2 options.
uint64_t preserve_seconds =
std::max(cfd->ioptions()->preserve_internal_time_seconds,
cfd->ioptions()->preclude_last_level_data_seconds);
if (!cfd->IsDropped() && preserve_seconds > 0) {
min_preserve_seconds = std::min(preserve_seconds, min_preserve_seconds);
max_preserve_seconds = std::max(preserve_seconds, max_preserve_seconds);
}
}
if (min_preserve_seconds == std::numeric_limits<uint64_t>::max()) {
seqno_to_time_mapping_.Resize(0, 0);
} else {
seqno_to_time_mapping_.Resize(min_preserve_seconds, max_preserve_seconds);
}
mapping_was_empty = seqno_to_time_mapping_.Empty();
}
uint64_t seqno_time_cadence = 0;
if (min_preserve_seconds != std::numeric_limits<uint64_t>::max()) {
// round up to 1 when the time_duration is smaller than
// kMaxSeqnoTimePairsPerCF
seqno_time_cadence = (min_preserve_seconds +
SeqnoToTimeMapping::kMaxSeqnoTimePairsPerCF - 1) /
SeqnoToTimeMapping::kMaxSeqnoTimePairsPerCF;
}
TEST_SYNC_POINT_CALLBACK(
"DBImpl::RegisterRecordSeqnoTimeWorker:BeforePeriodicTaskType", nullptr);
Status s;
if (seqno_time_cadence == 0) {
s = periodic_task_scheduler_.Unregister(PeriodicTaskType::kRecordSeqnoTime);
} else {
// Before registering the periodic task, we need to be sure to fulfill two
// promises:
// 1) Any DB created with preserve/preclude options set from the beginning
// will get pre-allocated seqnos with pre-populated time mappings back to
// the times we are interested in. (This will enable future import of data
// while preserving rough write time. We can only do this reliably from
// DB::Open, as otherwise there could be a race between CreateColumnFamily
// and the first Write to the DB, and seqno-to-time mappings need to be
// monotonic.
// 2) In any DB, any data written after setting preserve/preclude options
// must have a reasonable time estimate (so that we can accurately place
// the data), which means at least one entry in seqno_to_time_mapping_.
//
// FIXME: We don't currently guarantee that if the first column family with
// that setting is added or configured after initial DB::Open but before
// the first user Write. Fixing this causes complications with the crash
// test because if DB starts without preserve/preclude option, does some
// user writes but all those writes are lost in crash, then re-opens with
// preserve/preclude option, it sees seqno==1 which looks like one of the
// user writes was recovered, when actually it was not.
bool last_seqno_zero = GetLatestSequenceNumber() == 0;
assert(!is_new_db || last_seqno_zero);
if (is_new_db && last_seqno_zero) {
// Pre-allocate seqnos and pre-populate historical mapping
assert(mapping_was_empty);
// We can simply modify these, before writes are allowed
constexpr uint64_t kMax = SeqnoToTimeMapping::kMaxSeqnoTimePairsPerSST;
versions_->SetLastAllocatedSequence(kMax);
versions_->SetLastPublishedSequence(kMax);
versions_->SetLastSequence(kMax);
// And record in manifest, to avoid going backwards in seqno on re-open
// (potentially with different options). Concurrency is simple because we
// are in DB::Open
{
InstrumentedMutexLock l(&mutex_);
VersionEdit edit;
edit.SetLastSequence(kMax);
s = versions_->LogAndApplyToDefaultColumnFamily(
{}, &edit, &mutex_, directories_.GetDbDir());
if (!s.ok() && versions_->io_status().IsIOError()) {
s = error_handler_.SetBGError(versions_->io_status(),
BackgroundErrorReason::kManifestWrite);
}
}
// Pre-populate mappings for reserved sequence numbers.
RecordSeqnoToTimeMapping(max_preserve_seconds);
} else if (mapping_was_empty) {
if (!last_seqno_zero) {
// Ensure at least one mapping (or log a warning)
RecordSeqnoToTimeMapping(/*populate_historical_seconds=*/0);
} else {
// FIXME (see limitation described above)
}
}
s = periodic_task_scheduler_.Register(
PeriodicTaskType::kRecordSeqnoTime,
periodic_task_functions_.at(PeriodicTaskType::kRecordSeqnoTime),
seqno_time_cadence);
}
return s;
}
Status DBImpl::CancelPeriodicTaskScheduler() {
Status s = Status::OK();
for (uint8_t task_type = 0;
task_type < static_cast<uint8_t>(PeriodicTaskType::kMax); task_type++) {
s = periodic_task_scheduler_.Unregister(
static_cast<PeriodicTaskType>(task_type));
if (!s.ok()) {
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"Failed to unregister periodic task %d, status: %s",
task_type, s.ToString().c_str());
}
}
return s;
}
// esitmate the total size of stats_history_
size_t DBImpl::EstimateInMemoryStatsHistorySize() const {
stats_history_mutex_.AssertHeld();
size_t size_total =
sizeof(std::map<uint64_t, std::map<std::string, uint64_t>>);
if (stats_history_.size() == 0) return size_total;
size_t size_per_slice =
sizeof(uint64_t) + sizeof(std::map<std::string, uint64_t>);
// non-empty map, stats_history_.begin() guaranteed to exist
for (const auto& pairs : stats_history_.begin()->second) {
size_per_slice +=
pairs.first.capacity() + sizeof(pairs.first) + sizeof(pairs.second);
}
size_total = size_per_slice * stats_history_.size();
return size_total;
}
void DBImpl::PersistStats() {
TEST_SYNC_POINT("DBImpl::PersistStats:Entry");
if (shutdown_initiated_) {
return;
}
TEST_SYNC_POINT("DBImpl::PersistStats:StartRunning");
uint64_t now_seconds =
immutable_db_options_.clock->NowMicros() / kMicrosInSecond;
Statistics* statistics = immutable_db_options_.stats;
if (!statistics) {
return;
}
size_t stats_history_size_limit = 0;
{
InstrumentedMutexLock l(&mutex_);
stats_history_size_limit = mutable_db_options_.stats_history_buffer_size;
}
std::map<std::string, uint64_t> stats_map;
if (!statistics->getTickerMap(&stats_map)) {
return;
}
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"------- PERSISTING STATS -------");
if (immutable_db_options_.persist_stats_to_disk) {
WriteBatch batch;
Status s = Status::OK();
if (stats_slice_initialized_) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Reading %" ROCKSDB_PRIszt " stats from statistics\n",
stats_slice_.size());
for (const auto& stat : stats_map) {
if (s.ok()) {
char key[100];
int length =
EncodePersistentStatsKey(now_seconds, stat.first, 100, key);
// calculate the delta from last time
if (stats_slice_.find(stat.first) != stats_slice_.end()) {
uint64_t delta = stat.second - stats_slice_[stat.first];
s = batch.Put(persist_stats_cf_handle_,
Slice(key, std::min(100, length)),
std::to_string(delta));
}
}
}
}
stats_slice_initialized_ = true;
std::swap(stats_slice_, stats_map);
if (s.ok()) {
WriteOptions wo;
wo.low_pri = true;
wo.no_slowdown = true;
wo.sync = false;
s = Write(wo, &batch);
}
if (!s.ok()) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Writing to persistent stats CF failed -- %s",
s.ToString().c_str());