NextGraph
/
rocksdb
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Refactor WriteImpl (pipeline write part 1)

Browse Source 
Summary:
Refactor WriteImpl() so when I plug-in the pipeline write code (which is
an alternative approach for WriteThread), some of the logic can be
reuse. I split out the following methods from WriteImpl():

* PreprocessWrite()
* HandleWALFull() (previous MaybeFlushColumnFamilies())
* HandleWriteBufferFull()
* WriteToWAL()

Also adding a constructor to WriteThread::Writer, and move WriteContext into db_impl.h.
No real logic change in this patch.
Closes https://github.com/facebook/rocksdb/pull/2042

Differential Revision: D4781014

Pulled By: yiwu-arbug

fbshipit-source-id: d45ca18
main
Yi Wu 7 years ago committed by Facebook Github Bot
parent 6ef8c620d3
commit 9e44531803
6 changed files with 292 additions and 249 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 470
      db/db_impl.cc
  2. 36
      db/db_impl.h
  3. 5
      db/db_impl_debug.cc
  4. 2
      db/write_thread.cc
  5. 24
      db/write_thread.h
  6. 4
      utilities/transactions/transaction_test.cc

470
db/db_impl.cc
Unescape View File

@ -106,20 +106,6 @@ const std::string kDefaultColumnFamilyName("default");
void DumpRocksDBBuildVersion(Logger * log);
struct DBImpl::WriteContext {
autovector<SuperVersion*> superversions_to_free_;
autovector<MemTable*> memtables_to_free_;
~WriteContext() {
for (auto& sv : superversions_to_free_) {
delete sv;
}
for (auto& m : memtables_to_free_) {
delete m;
}
}
};
Options SanitizeOptions(const std::string& dbname,
const Options& src) {
auto db_options = SanitizeOptions(dbname, DBOptions(src));
@ -2459,6 +2445,7 @@ Status DBImpl::SetOptions(ColumnFamilyHandle* column_family,
MutableCFOptions new_options;
Status s;
Status persist_options_status;
WriteThread::Writer w;
{
InstrumentedMutexLock l(&mutex_);
s = cfd->SetOptions(options_map);
@ -2475,7 +2462,9 @@ Status DBImpl::SetOptions(ColumnFamilyHandle* column_family,
InstallSuperVersionAndScheduleWork(cfd, nullptr, new_options);
delete old_sv;
persist_options_status = PersistOptions();
write_thread_.EnterUnbatched(&w, &mutex_);
persist_options_status = WriteOptionsFile();
write_thread_.ExitUnbatched(&w);
}
}
@ -2523,6 +2512,8 @@ Status DBImpl::SetDBOptions(
MutableDBOptions new_options;
Status s;
Status persist_options_status;
WriteThread::Writer w;
WriteContext write_context;
{
InstrumentedMutexLock l(&mutex_);
s = GetMutableDBOptionsFromStrings(mutable_db_options_, options_map,
@ -2539,11 +2530,17 @@ Status DBImpl::SetDBOptions(
mutable_db_options_ = new_options;
write_thread_.EnterUnbatched(&w, &mutex_);
if (total_log_size_ > GetMaxTotalWalSize()) {
MaybeFlushColumnFamilies();
Status purge_wal_status = HandleWALFull(&write_context);
if (!purge_wal_status.ok()) {
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"Unable to purge WAL files in SetDBOptions() -- %s",
purge_wal_status.ToString().c_str());
}
}
persist_options_status = PersistOptions();
persist_options_status = WriteOptionsFile();
write_thread_.ExitUnbatched(&w);
}
}
ROCKS_LOG_INFO(immutable_db_options_.info_log, "SetDBOptions(), inputs:");
@ -2572,15 +2569,6 @@ Status DBImpl::SetDBOptions(
#endif // ROCKSDB_LITE
}
Status DBImpl::PersistOptions() {
mutex_.AssertHeld();
WriteThread::Writer w;
write_thread_.EnterUnbatched(&w, &mutex_);
Status s = WriteOptionsFile();
write_thread_.ExitUnbatched(&w);
return s;
}
// return the same level if it cannot be moved
int DBImpl::FindMinimumEmptyLevelFitting(ColumnFamilyData* cfd,
const MutableCFOptions& mutable_cf_options, int level) {
@ -4674,14 +4662,8 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
Status status;
PERF_TIMER_GUARD(write_pre_and_post_process_time);
WriteThread::Writer w;
w.batch = my_batch;
w.sync = write_options.sync;
w.disableWAL = write_options.disableWAL;
w.disable_memtable = disable_memtable;
w.in_batch_group = false;
w.callback = callback;
w.log_ref = log_ref;
WriteThread::Writer w(write_options, my_batch, callback, log_ref,
disable_memtable);
if (!write_options.disableWAL) {
RecordTick(stats_, WRITE_WITH_WAL);
@ -4694,10 +4676,6 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
// we are a non-leader in a parallel group
PERF_TIMER_GUARD(write_memtable_time);
if (log_used != nullptr) {
*log_used = w.log_used;
}
if (w.ShouldWriteToMemtable()) {
ColumnFamilyMemTablesImpl column_family_memtables(
versions_->GetColumnFamilySet());
@ -4724,123 +4702,35 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
*log_used = w.log_used;
}
// write is complete and leader has updated sequence
RecordTick(stats_, WRITE_DONE_BY_OTHER);
return w.FinalStatus();
}
// else we are the leader of the write batch group
assert(w.state == WriteThread::STATE_GROUP_LEADER);
WriteContext context;
mutex_.Lock();
if (!write_options.disableWAL) {
default_cf_internal_stats_->AddDBStats(InternalStats::WRITE_WITH_WAL, 1);
}
RecordTick(stats_, WRITE_DONE_BY_SELF);
default_cf_internal_stats_->AddDBStats(InternalStats::WRITE_DONE_BY_SELF, 1);
// Once reaches this point, the current writer "w" will try to do its write
// job. It may also pick up some of the remaining writers in the "writers_"
// when it finds suitable, and finish them in the same write batch.
// This is how a write job could be done by the other writer.
assert(!single_column_family_mode_ ||
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1);
if (UNLIKELY(!single_column_family_mode_ &&
total_log_size_ > GetMaxTotalWalSize())) {
MaybeFlushColumnFamilies();
}
if (UNLIKELY(write_buffer_manager_->ShouldFlush())) {
// Before a new memtable is added in SwitchMemtable(),
// write_buffer_manager_->ShouldFlush() will keep returning true. If another
// thread is writing to another DB with the same write buffer, they may also
// be flushed. We may end up with flushing much more DBs than needed. It's
// suboptimal but still correct.
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"Flushing column family with largest mem table size. Write buffer is "
"using %" PRIu64 " bytes out of a total of %" PRIu64 ".",
write_buffer_manager_->memory_usage(),
write_buffer_manager_->buffer_size());
// no need to refcount because drop is happening in write thread, so can't
// happen while we're in the write thread
ColumnFamilyData* cfd_picked = nullptr;
SequenceNumber seq_num_for_cf_picked = kMaxSequenceNumber;
for (auto cfd : *versions_->GetColumnFamilySet()) {
if (cfd->IsDropped()) {
continue;
}
if (!cfd->mem()->IsEmpty()) {
// We only consider active mem table, hoping immutable memtable is
// already in the process of flushing.
uint64_t seq = cfd->mem()->GetCreationSeq();
if (cfd_picked == nullptr || seq < seq_num_for_cf_picked) {
cfd_picked = cfd;
seq_num_for_cf_picked = seq;
}
}
}
if (cfd_picked != nullptr) {
status = SwitchMemtable(cfd_picked, &context);
if (status.ok()) {
cfd_picked->imm()->FlushRequested();
SchedulePendingFlush(cfd_picked);
MaybeScheduleFlushOrCompaction();
}
}
}
if (UNLIKELY(status.ok() && !bg_error_.ok())) {
status = bg_error_;
}
if (UNLIKELY(status.ok() && !flush_scheduler_.Empty())) {
status = ScheduleFlushes(&context);
}
if (UNLIKELY(status.ok() && (write_controller_.IsStopped() ||
write_controller_.NeedsDelay()))) {
PERF_TIMER_STOP(write_pre_and_post_process_time);
PERF_TIMER_GUARD(write_delay_time);
// We don't know size of curent batch so that we always use the size
// for previous one. It might create a fairness issue that expiration
// might happen for smaller writes but larger writes can go through.
// Can optimize it if it is an issue.
status = DelayWrite(last_batch_group_size_, write_options);
PERF_TIMER_START(write_pre_and_post_process_time);
}
uint64_t last_sequence = versions_->LastSequence();
WriteContext write_context;
WriteThread::Writer* last_writer = &w;
autovector<WriteThread::Writer*> write_group;
bool need_log_sync = !write_options.disableWAL && write_options.sync;
bool need_log_dir_sync = need_log_sync && !log_dir_synced_;
bool logs_getting_synced = false;
if (status.ok()) {
if (need_log_sync) {
while (logs_.front().getting_synced) {
log_sync_cv_.Wait();
}
for (auto& log : logs_) {
assert(!log.getting_synced);
log.getting_synced = true;
}
logs_getting_synced = true;
}
// Add to log and apply to memtable. We can release the lock
// during this phase since &w is currently responsible for logging
// and protects against concurrent loggers and concurrent writes
// into memtables
}
mutex_.Lock();
bool need_log_sync = !write_options.disableWAL && write_options.sync;
bool need_log_dir_sync = need_log_sync && !log_dir_synced_;
status = PreprocessWrite(write_options, need_log_sync, &logs_getting_synced,
&write_context);
uint64_t last_sequence = versions_->LastSequence();
log::Writer* cur_log_writer = logs_.back().writer;
mutex_.Unlock();
// At this point the mutex is unlocked
// Add to log and apply to memtable. We can release the lock
// during this phase since &w is currently responsible for logging
// and protects against concurrent loggers and concurrent writes
// into memtables
bool exit_completed_early = false;
last_batch_group_size_ =
@ -4881,110 +4771,44 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
const SequenceNumber current_sequence = last_sequence + 1;
last_sequence += total_count;
// Record statistics
// Update stats while we are an exclusive group leader, so we know
// that nobody else can be writing to these particular stats.
// We're optimistic, updating the stats before we successfully
// commit. That lets us release our leader status early in
// some cases.
auto stats = default_cf_internal_stats_;
stats->AddDBStats(InternalStats::NUMBER_KEYS_WRITTEN, total_count);
RecordTick(stats_, NUMBER_KEYS_WRITTEN, total_count);
stats->AddDBStats(InternalStats::BYTES_WRITTEN, total_byte_size);
RecordTick(stats_, BYTES_WRITTEN, total_byte_size);
stats->AddDBStats(InternalStats::WRITE_DONE_BY_SELF, 1);
RecordTick(stats_, WRITE_DONE_BY_SELF);
auto write_done_by_other = write_group.size() - 1;
if (write_done_by_other > 0) {
stats->AddDBStats(InternalStats::WRITE_DONE_BY_OTHER,
write_done_by_other);
RecordTick(stats_, WRITE_DONE_BY_OTHER, write_done_by_other);
}
MeasureTime(stats_, BYTES_PER_WRITE, total_byte_size);
PERF_TIMER_STOP(write_pre_and_post_process_time);
if (write_options.disableWAL) {
has_unpersisted_data_.store(true, std::memory_order_relaxed);
}
uint64_t log_size = 0;
if (!write_options.disableWAL) {
PERF_TIMER_GUARD(write_wal_time);
WriteBatch* merged_batch = nullptr;
if (write_group.size() == 1 && write_group[0]->ShouldWriteToWAL() &&
write_group[0]->batch->GetWalTerminationPoint().is_cleared()) {
// we simply write the first WriteBatch to WAL if the group only
// contains one batch, that batch should be written to the WAL,
// and the batch is not wanting to be truncated
merged_batch = write_group[0]->batch;
write_group[0]->log_used = logfile_number_;
} else {
// WAL needs all of the batches flattened into a single batch.
// We could avoid copying here with an iov-like AddRecord
// interface
merged_batch = &tmp_batch_;
for (auto writer : write_group) {
if (writer->ShouldWriteToWAL()) {
WriteBatchInternal::Append(merged_batch, writer->batch,
/*WAL_only*/ true);
}
writer->log_used = logfile_number_;
}
}
PERF_TIMER_STOP(write_pre_and_post_process_time);
if (status.ok() && !write_options.disableWAL) {
PERF_TIMER_GUARD(write_wal_time);
status = WriteToWAL(write_group, cur_log_writer, need_log_sync,
need_log_dir_sync, current_sequence);
if (log_used != nullptr) {
*log_used = logfile_number_;
}
WriteBatchInternal::SetSequence(merged_batch, current_sequence);
Slice log_entry = WriteBatchInternal::Contents(merged_batch);
status = cur_log_writer->AddRecord(log_entry);
total_log_size_ += log_entry.size();
alive_log_files_.back().AddSize(log_entry.size());
log_empty_ = false;
log_size = log_entry.size();
RecordTick(stats_, WAL_FILE_BYTES, log_size);
if (status.ok() && need_log_sync) {
RecordTick(stats_, WAL_FILE_SYNCED);
StopWatch sw(env_, stats_, WAL_FILE_SYNC_MICROS);
// It's safe to access logs_ with unlocked mutex_ here because:
// - we've set getting_synced=true for all logs,
// so other threads won't pop from logs_ while we're here,
// - only writer thread can push to logs_, and we're in
// writer thread, so no one will push to logs_,
// - as long as other threads don't modify it, it's safe to read
// from std::deque from multiple threads concurrently.
for (auto& log : logs_) {
status = log.writer->file()->Sync(immutable_db_options_.use_fsync);
if (!status.ok()) {
break;
}
}
if (status.ok() && need_log_dir_sync) {
// We only sync WAL directory the first time WAL syncing is
// requested, so that in case users never turn on WAL sync,
// we can avoid the disk I/O in the write code path.
status = directories_.GetWalDir()->Fsync();
}
}
if (merged_batch == &tmp_batch_) {
tmp_batch_.Clear();
}
}
if (status.ok()) {
PERF_TIMER_GUARD(write_memtable_time);
{
// Update stats while we are an exclusive group leader, so we know
// that nobody else can be writing to these particular stats.
// We're optimistic, updating the stats before we successfully
// commit. That lets us release our leader status early in
// some cases.
auto stats = default_cf_internal_stats_;
stats->AddDBStats(InternalStats::BYTES_WRITTEN, total_byte_size);
stats->AddDBStats(InternalStats::NUMBER_KEYS_WRITTEN, total_count);
if (!write_options.disableWAL) {
if (write_options.sync) {
stats->AddDBStats(InternalStats::WAL_FILE_SYNCED, 1);
}
stats->AddDBStats(InternalStats::WAL_FILE_BYTES, log_size);
}
uint64_t for_other = write_group.size() - 1;
if (for_other > 0) {
stats->AddDBStats(InternalStats::WRITE_DONE_BY_OTHER, for_other);
if (!write_options.disableWAL) {
stats->AddDBStats(InternalStats::WRITE_WITH_WAL, for_other);
}
}
}
if (!parallel) {
status = WriteBatchInternal::InsertInto(
write_group, current_sequence, column_family_memtables_.get(),
@ -5070,11 +4894,147 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
return status;
}
void DBImpl::MaybeFlushColumnFamilies() {
Status DBImpl::PreprocessWrite(const WriteOptions& write_options,
bool need_log_sync, bool* logs_getting_synced,
WriteContext* write_context) {
mutex_.AssertHeld();
assert(write_context != nullptr && logs_getting_synced != nullptr);
Status status;
assert(!single_column_family_mode_ ||
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1);
if (UNLIKELY(status.ok() && !single_column_family_mode_ &&
total_log_size_ > GetMaxTotalWalSize())) {
status = HandleWALFull(write_context);
}
if (UNLIKELY(status.ok() && write_buffer_manager_->ShouldFlush())) {
// Before a new memtable is added in SwitchMemtable(),
// write_buffer_manager_->ShouldFlush() will keep returning true. If another
// thread is writing to another DB with the same write buffer, they may also
// be flushed. We may end up with flushing much more DBs than needed. It's
// suboptimal but still correct.
status = HandleWriteBufferFull(write_context);
}
if (UNLIKELY(status.ok() && !bg_error_.ok())) {
status = bg_error_;
}
if (UNLIKELY(status.ok() && !flush_scheduler_.Empty())) {
status = ScheduleFlushes(write_context);
}
if (UNLIKELY(status.ok() && (write_controller_.IsStopped() ||
write_controller_.NeedsDelay()))) {
PERF_TIMER_GUARD(write_delay_time);
// We don't know size of curent batch so that we always use the size
// for previous one. It might create a fairness issue that expiration
// might happen for smaller writes but larger writes can go through.
// Can optimize it if it is an issue.
status = DelayWrite(last_batch_group_size_, write_options);
}
if (status.ok() && need_log_sync) {
while (logs_.front().getting_synced) {
log_sync_cv_.Wait();
}
for (auto& log : logs_) {
assert(!log.getting_synced);
log.getting_synced = true;
}
*logs_getting_synced = true;
}
return status;
}
Status DBImpl::WriteToWAL(const autovector<WriteThread::Writer*>& write_group,
log::Writer* log_writer, bool need_log_sync,
bool need_log_dir_sync, SequenceNumber sequence) {
Status status;
WriteBatch* merged_batch = nullptr;
size_t write_with_wal = 0;
if (write_group.size() == 1 && write_group[0]->ShouldWriteToWAL() &&
write_group[0]->batch->GetWalTerminationPoint().is_cleared()) {
// we simply write the first WriteBatch to WAL if the group only
// contains one batch, that batch should be written to the WAL,
// and the batch is not wanting to be truncated
merged_batch = write_group[0]->batch;
write_group[0]->log_used = logfile_number_;
write_with_wal = 1;
} else {
// WAL needs all of the batches flattened into a single batch.
// We could avoid copying here with an iov-like AddRecord
// interface
merged_batch = &tmp_batch_;
for (auto writer : write_group) {
if (writer->ShouldWriteToWAL()) {
WriteBatchInternal::Append(merged_batch, writer->batch,
/*WAL_only*/ true);
write_with_wal++;
}
writer->log_used = logfile_number_;
}
}
WriteBatchInternal::SetSequence(merged_batch, sequence);
Slice log_entry = WriteBatchInternal::Contents(merged_batch);
status = log_writer->AddRecord(log_entry);
total_log_size_ += log_entry.size();
alive_log_files_.back().AddSize(log_entry.size());
log_empty_ = false;
uint64_t log_size = log_entry.size();
if (status.ok() && need_log_sync) {
StopWatch sw(env_, stats_, WAL_FILE_SYNC_MICROS);
// It's safe to access logs_ with unlocked mutex_ here because:
// - we've set getting_synced=true for all logs,
// so other threads won't pop from logs_ while we're here,
// - only writer thread can push to logs_, and we're in
// writer thread, so no one will push to logs_,
// - as long as other threads don't modify it, it's safe to read
// from std::deque from multiple threads concurrently.
for (auto& log : logs_) {
status = log.writer->file()->Sync(immutable_db_options_.use_fsync);
if (!status.ok()) {
break;
}
}
if (status.ok() && need_log_dir_sync) {
// We only sync WAL directory the first time WAL syncing is
// requested, so that in case users never turn on WAL sync,
// we can avoid the disk I/O in the write code path.
status = directories_.GetWalDir()->Fsync();
}
}
if (merged_batch == &tmp_batch_) {
tmp_batch_.Clear();
}
if (status.ok()) {
auto stats = default_cf_internal_stats_;
if (need_log_sync) {
stats->AddDBStats(InternalStats::WAL_FILE_SYNCED, 1);
RecordTick(stats_, WAL_FILE_SYNCED);
}
stats->AddDBStats(InternalStats::WAL_FILE_BYTES, log_size);
RecordTick(stats_, WAL_FILE_BYTES, log_size);
stats->AddDBStats(InternalStats::WRITE_WITH_WAL, write_with_wal);
RecordTick(stats_, WRITE_WITH_WAL, write_with_wal);
}
return status;
}
Status DBImpl::HandleWALFull(WriteContext* write_context) {
mutex_.AssertHeld();
assert(write_context != nullptr);
Status status;
if (alive_log_files_.begin()->getting_flushed) {
return;
return status;
}
auto oldest_alive_log = alive_log_files_.begin()->number;
@ -5088,7 +5048,7 @@ void DBImpl::MaybeFlushColumnFamilies() {
// the oldest alive log but the log still contained uncommited transactions.
// the oldest alive log STILL contains uncommited transaction so there
// is still nothing that we can do.
return;
return status;
} else {
ROCKS_LOG_WARN(
immutable_db_options_.info_log,
@ -5103,8 +5063,6 @@ void DBImpl::MaybeFlushColumnFamilies() {
alive_log_files_.begin()->getting_flushed = true;
}
WriteContext context;
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Flushing all column families with data in WAL number %" PRIu64
". Total log size is %" PRIu64
@ -5117,7 +5075,7 @@ void DBImpl::MaybeFlushColumnFamilies() {
continue;
}
if (cfd->OldestLogToKeep() <= oldest_alive_log) {
auto status = SwitchMemtable(cfd, &context);
status = SwitchMemtable(cfd, write_context);
if (!status.ok()) {
break;
}
@ -5126,7 +5084,53 @@ void DBImpl::MaybeFlushColumnFamilies() {
}
}
MaybeScheduleFlushOrCompaction();
return status;
}
Status DBImpl::HandleWriteBufferFull(WriteContext* write_context) {
mutex_.AssertHeld();
assert(write_context != nullptr);
Status status;
// Before a new memtable is added in SwitchMemtable(),
// write_buffer_manager_->ShouldFlush() will keep returning true. If another
// thread is writing to another DB with the same write buffer, they may also
// be flushed. We may end up with flushing much more DBs than needed. It's
// suboptimal but still correct.
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"Flushing column family with largest mem table size. Write buffer is "
"using %" PRIu64 " bytes out of a total of %" PRIu64 ".",
write_buffer_manager_->memory_usage(),
write_buffer_manager_->buffer_size());
// no need to refcount because drop is happening in write thread, so can't
// happen while we're in the write thread
ColumnFamilyData* cfd_picked = nullptr;
SequenceNumber seq_num_for_cf_picked = kMaxSequenceNumber;
for (auto cfd : *versions_->GetColumnFamilySet()) {
if (cfd->IsDropped()) {
continue;
}
if (!cfd->mem()->IsEmpty()) {
// We only consider active mem table, hoping immutable memtable is
// already in the process of flushing.
uint64_t seq = cfd->mem()->GetCreationSeq();
if (cfd_picked == nullptr || seq < seq_num_for_cf_picked) {
cfd_picked = cfd;
seq_num_for_cf_picked = seq;
}
}
}
if (cfd_picked != nullptr) {
status = SwitchMemtable(cfd_picked, write_context);
if (status.ok()) {
cfd_picked->imm()->FlushRequested();
SchedulePendingFlush(cfd_picked);
MaybeScheduleFlushOrCompaction();
}
}
return status;
}
uint64_t DBImpl::GetMaxTotalWalSize() const {

36
db/db_impl.h
Unescape View File

@ -314,7 +314,7 @@ class DBImpl : public DB {
ColumnFamilyHandle* column_family = nullptr,
bool disallow_trivial_move = false);
void TEST_MaybeFlushColumnFamilies();
void TEST_HandleWALFull();
bool TEST_UnableToFlushOldestLog() {
return unable_to_flush_oldest_log_;
@ -600,7 +600,19 @@ class DBImpl : public DB {
#endif
struct CompactionState;
struct WriteContext;
struct WriteContext {
autovector<SuperVersion*> superversions_to_free_;
autovector<MemTable*> memtables_to_free_;
~WriteContext() {
for (auto& sv : superversions_to_free_) {
delete sv;
}
for (auto& m : memtables_to_free_) {
delete m;
}
}
};
struct PurgeFileInfo;
@ -677,6 +689,20 @@ class DBImpl : public DB {
// Wait for memtable flushed
Status WaitForFlushMemTable(ColumnFamilyData* cfd);
// REQUIRES: mutex locked
Status HandleWALFull(WriteContext* write_context);
// REQUIRES: mutex locked
Status HandleWriteBufferFull(WriteContext* write_context);
// REQUIRES: mutex locked
Status PreprocessWrite(const WriteOptions& write_options, bool need_log_sync,
bool* logs_getting_syned, WriteContext* write_context);
Status WriteToWAL(const autovector<WriteThread::Writer*>& write_group,
log::Writer* log_writer, bool need_log_sync,
bool need_log_dir_sync, SequenceNumber sequence);
#ifndef ROCKSDB_LITE
Status CompactFilesImpl(const CompactionOptions& compact_options,
@ -740,12 +766,6 @@ class DBImpl : public DB {
const Snapshot* GetSnapshotImpl(bool is_write_conflict_boundary);
// Persist RocksDB options under the single write thread
// REQUIRES: mutex locked
Status PersistOptions();
void MaybeFlushColumnFamilies();
uint64_t GetMaxTotalWalSize() const;
// table_cache_ provides its own synchronization

5
db/db_impl_debug.cc
Unescape View File

@ -19,9 +19,10 @@ uint64_t DBImpl::TEST_GetLevel0TotalSize() {
return default_cf_handle_->cfd()->current()->storage_info()->NumLevelBytes(0);
}
void DBImpl::TEST_MaybeFlushColumnFamilies() {
void DBImpl::TEST_HandleWALFull() {
WriteContext write_context;
InstrumentedMutexLock l(&mutex_);
MaybeFlushColumnFamilies();
HandleWALFull(&write_context);
}
int64_t DBImpl::TEST_MaxNextLevelOverlappingBytes(

2
db/write_thread.cc
Unescape View File

@ -274,7 +274,7 @@ size_t WriteThread::EnterAsBatchGroupLeader(
break;
}
if (!w->disableWAL && leader->disableWAL) {
if (!w->disable_wal && leader->disable_wal) {
// Do not include a write that needs WAL into a batch that has
// WAL disabled.
break;

24
db/write_thread.h
Unescape View File

@ -15,6 +15,7 @@
#include <vector>
#include "db/write_callback.h"
#include "rocksdb/options.h"
#include "rocksdb/status.h"
#include "rocksdb/types.h"
#include "rocksdb/write_batch.h"
@ -80,7 +81,7 @@ class WriteThread {
WriteBatch* batch;
bool sync;
bool no_slowdown;
bool disableWAL;
bool disable_wal;
bool disable_memtable;
uint64_t log_used; // log number that this batch was inserted into
uint64_t log_ref; // log number that memtable insert should reference
@ -101,7 +102,7 @@ class WriteThread {
: batch(nullptr),
sync(false),
no_slowdown(false),
disableWAL(false),
disable_wal(false),
disable_memtable(false),
log_used(0),
log_ref(0),
@ -113,6 +114,23 @@ class WriteThread {
link_older(nullptr),
link_newer(nullptr) {}
Writer(const WriteOptions& write_options, WriteBatch* _batch,
WriteCallback* _callback, uint64_t _log_ref, bool _disable_memtable)
: batch(_batch),
sync(write_options.sync),
no_slowdown(write_options.no_slowdown),
disable_wal(write_options.disableWAL),
disable_memtable(_disable_memtable),
log_used(0),
log_ref(_log_ref),
in_batch_group(false),
callback(_callback),
made_waitable(false),
state(STATE_INIT),
parallel_group(nullptr),
link_older(nullptr),
link_newer(nullptr) {}
~Writer() {
if (made_waitable) {
StateMutex().~mutex();
@ -166,7 +184,7 @@ class WriteThread {
return !CallbackFailed() && !disable_memtable;
}
bool ShouldWriteToWAL() { return !CallbackFailed() && !disableWAL; }
bool ShouldWriteToWAL() { return !CallbackFailed() && !disable_wal; }
// No other mutexes may be acquired while holding StateMutex(), it is
// always last in the order

4
utilities/transactions/transaction_test.cc
Unescape View File

@ -1429,7 +1429,7 @@ TEST_P(TransactionTest, TwoPhaseLogRollingTest2) {
// request a flush for all column families such that the earliest
// alive log file can be killed
db_impl->TEST_MaybeFlushColumnFamilies();
db_impl->TEST_HandleWALFull();
// log cannot be flushed because txn2 has not been commited
ASSERT_TRUE(!db_impl->TEST_IsLogGettingFlushed());
ASSERT_TRUE(db_impl->TEST_UnableToFlushOldestLog());
@ -1444,7 +1444,7 @@ TEST_P(TransactionTest, TwoPhaseLogRollingTest2) {
s = txn2->Commit();
ASSERT_OK(s);
db_impl->TEST_MaybeFlushColumnFamilies();
db_impl->TEST_HandleWALFull();
ASSERT_TRUE(!db_impl->TEST_UnableToFlushOldestLog());
// we should see that cfb now has a flush requested

Write Preview
Loading…
Cancel
Save