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Inform caller when rocksdb is stalling writes

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Summary:
Add a new function in Listener to let the caller know when rocksdb
is stalling writes.
Closes https://github.com/facebook/rocksdb/pull/2897

Differential Revision: D5860124

Pulled By: schischi

fbshipit-source-id: ee791606169aa64f772c86f817cebf02624e05e1
main
Adrien Schildknecht 7 years ago committed by Facebook Github Bot
parent cc20ec3689
commit 01542400a8
13 changed files with 219 additions and 100 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 45
      db/column_family.cc
  2. 14
      db/column_family.h
  3. 4
      db/compacted_db_impl.cc
  4. 28
      db/db_impl.cc
  5. 19
      db/db_impl.h
  6. 56
      db/db_impl_compaction_flush.cc
  7. 5
      db/db_impl_experimental.cc
  8. 6
      db/db_impl_open.cc
  9. 5
      db/db_impl_readonly.cc
  10. 7
      db/db_impl_write.cc
  11. 21
      db/db_test.cc
  12. 85
      db/job_context.h
  13. 24
      include/rocksdb/listener.h

45
db/column_family.cc
Unescape View File

@ -613,8 +613,9 @@ int GetL0ThresholdSpeedupCompaction(int level0_file_num_compaction_trigger,
}
} // namespace
void ColumnFamilyData::RecalculateWriteStallConditions(
WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
const MutableCFOptions& mutable_cf_options) {
auto write_stall_condition = WriteStallCondition::kNormal;
if (current_ != nullptr) {
auto* vstorage = current_->storage_info();
auto write_controller = column_family_set_->write_controller_;
@ -627,6 +628,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
if (imm()->NumNotFlushed() >= mutable_cf_options.max_write_buffer_number) {
write_controller_token_ = write_controller->GetStopToken();
internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_STOPS, 1);
write_stall_condition = WriteStallCondition::kStopped;
ROCKS_LOG_WARN(
ioptions_.info_log,
"[%s] Stopping writes because we have %d immutable memtables "
@ -638,6 +640,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
mutable_cf_options.level0_stop_writes_trigger) {
write_controller_token_ = write_controller->GetStopToken();
internal_stats_->AddCFStats(InternalStats::L0_FILE_COUNT_LIMIT_STOPS, 1);
write_stall_condition = WriteStallCondition::kStopped;
if (compaction_picker_->IsLevel0CompactionInProgress()) {
internal_stats_->AddCFStats(
InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_STOPS, 1);
@ -652,6 +655,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
write_controller_token_ = write_controller->GetStopToken();
internal_stats_->AddCFStats(
InternalStats::PENDING_COMPACTION_BYTES_LIMIT_STOPS, 1);
write_stall_condition = WriteStallCondition::kStopped;
ROCKS_LOG_WARN(
ioptions_.info_log,
"[%s] Stopping writes because of estimated pending compaction "
@ -665,6 +669,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
prev_compaction_needed_bytes_, was_stopped,
mutable_cf_options.disable_auto_compactions);
internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_SLOWDOWNS, 1);
write_stall_condition = WriteStallCondition::kDelayed;
ROCKS_LOG_WARN(
ioptions_.info_log,
"[%s] Stalling writes because we have %d immutable memtables "
@ -686,6 +691,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
mutable_cf_options.disable_auto_compactions);
internal_stats_->AddCFStats(InternalStats::L0_FILE_COUNT_LIMIT_SLOWDOWNS,
1);
write_stall_condition = WriteStallCondition::kDelayed;
if (compaction_picker_->IsLevel0CompactionInProgress()) {
internal_stats_->AddCFStats(
InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS, 1);
@ -716,6 +722,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
mutable_cf_options.disable_auto_compactions);
internal_stats_->AddCFStats(
InternalStats::PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS, 1);
write_stall_condition = WriteStallCondition::kDelayed;
ROCKS_LOG_WARN(
ioptions_.info_log,
"[%s] Stalling writes because of estimated pending compaction "
@ -770,6 +777,7 @@ void ColumnFamilyData::RecalculateWriteStallConditions(
}
prev_compaction_needed_bytes_ = compaction_needed_bytes;
}
return write_stall_condition;
}
const EnvOptions* ColumnFamilyData::soptions() const {
@ -915,15 +923,16 @@ bool ColumnFamilyData::ReturnThreadLocalSuperVersion(SuperVersion* sv) {
return false;
}
SuperVersion* ColumnFamilyData::InstallSuperVersion(
SuperVersion* new_superversion, InstrumentedMutex* db_mutex) {
void ColumnFamilyData::InstallSuperVersion(
SuperVersionContext* sv_context, InstrumentedMutex* db_mutex) {
db_mutex->AssertHeld();
return InstallSuperVersion(new_superversion, db_mutex, mutable_cf_options_);
return InstallSuperVersion(sv_context, db_mutex, mutable_cf_options_);
}
SuperVersion* ColumnFamilyData::InstallSuperVersion(
SuperVersion* new_superversion, InstrumentedMutex* db_mutex,
void ColumnFamilyData::InstallSuperVersion(
SuperVersionContext* sv_context, InstrumentedMutex* db_mutex,
const MutableCFOptions& mutable_cf_options) {
SuperVersion* new_superversion = sv_context->new_superversion.release();
new_superversion->db_mutex = db_mutex;
new_superversion->mutable_cf_options = mutable_cf_options;
new_superversion->Init(mem_, imm_.current(), current_);
@ -931,16 +940,24 @@ SuperVersion* ColumnFamilyData::InstallSuperVersion(
super_version_ = new_superversion;
++super_version_number_;
super_version_->version_number = super_version_number_;
super_version_->write_stall_condition =
RecalculateWriteStallConditions(mutable_cf_options);
if (old_superversion != nullptr) {
if (old_superversion->write_stall_condition !=
new_superversion->write_stall_condition) {
sv_context->PushWriteStallNotification(
old_superversion->write_stall_condition,
new_superversion->write_stall_condition, GetName(), ioptions());
}
if (old_superversion->Unref()) {
old_superversion->Cleanup();
sv_context->superversions_to_free.push_back(old_superversion);
}
}
// Reset SuperVersions cached in thread local storage
ResetThreadLocalSuperVersions();
RecalculateWriteStallConditions(mutable_cf_options);
if (old_superversion != nullptr && old_superversion->Unref()) {
old_superversion->Cleanup();
return old_superversion; // will let caller delete outside of mutex
}
return nullptr;
}
void ColumnFamilyData::ResetThreadLocalSuperVersions() {

14
db/column_family.h
Unescape View File

@ -41,6 +41,7 @@ class DBImpl;
class LogBuffer;
class InstrumentedMutex;
class InstrumentedMutexLock;
struct SuperVersionContext;
extern const double kIncSlowdownRatio;
@ -95,6 +96,7 @@ struct SuperVersion {
MutableCFOptions mutable_cf_options;
// Version number of the current SuperVersion
uint64_t version_number;
WriteStallCondition write_stall_condition;
InstrumentedMutex* db_mutex;
@ -311,11 +313,11 @@ class ColumnFamilyData {
// As argument takes a pointer to allocated SuperVersion to enable
// the clients to allocate SuperVersion outside of mutex.
// IMPORTANT: Only call this from DBImpl::InstallSuperVersion()
SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
InstrumentedMutex* db_mutex,
const MutableCFOptions& mutable_cf_options);
SuperVersion* InstallSuperVersion(SuperVersion* new_superversion,
InstrumentedMutex* db_mutex);
void InstallSuperVersion(SuperVersionContext* sv_context,
InstrumentedMutex* db_mutex,
const MutableCFOptions& mutable_cf_options);
void InstallSuperVersion(SuperVersionContext* sv_context,
InstrumentedMutex* db_mutex);
void ResetThreadLocalSuperVersions();
@ -330,7 +332,7 @@ class ColumnFamilyData {
// recalculation of compaction score. These values are used in
// DBImpl::MakeRoomForWrite function to decide, if it need to make
// a write stall
void RecalculateWriteStallConditions(
WriteStallCondition RecalculateWriteStallConditions(
const MutableCFOptions& mutable_cf_options);
void set_initialized() { initialized_.store(true); }

4
db/compacted_db_impl.cc
Unescape View File

@ -93,6 +93,7 @@ std::vector<Status> CompactedDBImpl::MultiGet(const ReadOptions& options,
}
Status CompactedDBImpl::Init(const Options& options) {
SuperVersionContext sv_context(/* create_superversion */ true);
mutex_.Lock();
ColumnFamilyDescriptor cf(kDefaultColumnFamilyName,
ColumnFamilyOptions(options));
@ -100,9 +101,10 @@ Status CompactedDBImpl::Init(const Options& options) {
if (s.ok()) {
cfd_ = reinterpret_cast<ColumnFamilyHandleImpl*>(
DefaultColumnFamily())->cfd();
delete cfd_->InstallSuperVersion(new SuperVersion(), &mutex_);
cfd_->InstallSuperVersion(&sv_context, &mutex_);
}
mutex_.Unlock();
sv_context.Clean();
if (!s.ok()) {
return s;
}

28
db/db_impl.cc
Unescape View File

@ -484,6 +484,7 @@ Status DBImpl::SetOptions(ColumnFamilyHandle* column_family,
Status s;
Status persist_options_status;
WriteThread::Writer w;
SuperVersionContext sv_context(/* create_superversion */ true);
{
InstrumentedMutexLock l(&mutex_);
s = cfd->SetOptions(options_map);
@ -496,14 +497,13 @@ Status DBImpl::SetOptions(ColumnFamilyHandle* column_family,
// Trigger possible flush/compactions. This has to be before we persist
// options to file, otherwise there will be a deadlock with writer
// thread.
auto* old_sv =
InstallSuperVersionAndScheduleWork(cfd, nullptr, new_options);
delete old_sv;
InstallSuperVersionAndScheduleWork(cfd, &sv_context, new_options);
persist_options_status = WriteOptionsFile(
false /*need_mutex_lock*/, true /*need_enter_write_thread*/);
}
}
sv_context.Clean();
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"SetOptions() on column family [%s], inputs:",
@ -1229,6 +1229,7 @@ Status DBImpl::CreateColumnFamilyImpl(const ColumnFamilyOptions& cf_options,
return s;
}
SuperVersionContext sv_context(/* create_superversion */ true);
{
InstrumentedMutexLock l(&mutex_);
@ -1260,8 +1261,8 @@ Status DBImpl::CreateColumnFamilyImpl(const ColumnFamilyOptions& cf_options,
auto* cfd =
versions_->GetColumnFamilySet()->GetColumnFamily(column_family_name);
assert(cfd != nullptr);
delete InstallSuperVersionAndScheduleWork(
cfd, nullptr, *cfd->GetLatestMutableCFOptions());
InstallSuperVersionAndScheduleWork(
cfd, &sv_context, *cfd->GetLatestMutableCFOptions());
if (!cfd->mem()->IsSnapshotSupported()) {
is_snapshot_supported_ = false;
@ -1280,6 +1281,7 @@ Status DBImpl::CreateColumnFamilyImpl(const ColumnFamilyOptions& cf_options,
}
} // InstrumentedMutexLock l(&mutex_)
sv_context.Clean();
// this is outside the mutex
if (s.ok()) {
NewThreadStatusCfInfo(
@ -2035,8 +2037,9 @@ Status DBImpl::DeleteFile(std::string name) {
status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
&edit, &mutex_, directories_.GetDbDir());
if (status.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(
cfd, &job_context, *cfd->GetLatestMutableCFOptions());
InstallSuperVersionAndScheduleWork(
cfd, &job_context.superversion_context,
*cfd->GetLatestMutableCFOptions());
}
FindObsoleteFiles(&job_context, false);
} // lock released here
@ -2113,8 +2116,9 @@ Status DBImpl::DeleteFilesInRange(ColumnFamilyHandle* column_family,
status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
&edit, &mutex_, directories_.GetDbDir());
if (status.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(
cfd, &job_context, *cfd->GetLatestMutableCFOptions());
InstallSuperVersionAndScheduleWork(
cfd, &job_context.superversion_context,
*cfd->GetLatestMutableCFOptions());
}
for (auto* deleted_file : deleted_files) {
deleted_file->being_compacted = false;
@ -2678,6 +2682,7 @@ Status DBImpl::IngestExternalFile(
return status;
}
SuperVersionContext sv_context(/* create_superversion */ true);
TEST_SYNC_POINT("DBImpl::AddFile:Start");
{
// Lock db mutex
@ -2726,8 +2731,8 @@ Status DBImpl::IngestExternalFile(
&mutex_, directories_.GetDbDir());
}
if (status.ok()) {
delete InstallSuperVersionAndScheduleWork(cfd, nullptr,
*mutable_cf_options);
InstallSuperVersionAndScheduleWork(cfd, &sv_context,
*mutable_cf_options);
}
// Resume writes to the DB
@ -2753,6 +2758,7 @@ Status DBImpl::IngestExternalFile(
// mutex_ is unlocked here
// Cleanup
sv_context.Clean();
ingestion_job.Cleanup(status);
if (status.ok()) {

19
db/db_impl.h
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@ -666,13 +666,14 @@ class DBImpl : public DB {
struct CompactionState;
struct WriteContext {
autovector<SuperVersion*> superversions_to_free_;
SuperVersionContext superversion_context;
autovector<MemTable*> memtables_to_free_;
explicit WriteContext(bool create_superversion = false)
: superversion_context(create_superversion) {}
~WriteContext() {
for (auto& sv : superversions_to_free_) {
delete sv;
}
superversion_context.Clean();
for (auto& m : memtables_to_free_) {
delete m;
}
@ -1236,17 +1237,13 @@ class DBImpl : public DB {
// Background threads call this function, which is just a wrapper around
// the InstallSuperVersion() function. Background threads carry
// job_context which can have new_superversion already
// sv_context which can have new_superversion already
// allocated.
void InstallSuperVersionAndScheduleWorkWrapper(
ColumnFamilyData* cfd, JobContext* job_context,
const MutableCFOptions& mutable_cf_options);
// All ColumnFamily state changes go through this function. Here we analyze
// the new state and we schedule background work if we detect that the new
// state needs flush or compaction.
SuperVersion* InstallSuperVersionAndScheduleWork(
ColumnFamilyData* cfd, SuperVersion* new_sv,
void InstallSuperVersionAndScheduleWork(
ColumnFamilyData* cfd, SuperVersionContext* sv_context,
const MutableCFOptions& mutable_cf_options);
#ifndef ROCKSDB_LITE

56
db/db_impl_compaction_flush.cc
Unescape View File

@ -130,8 +130,8 @@ Status DBImpl::FlushMemTableToOutputFile(
}
if (s.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(cfd, job_context,
mutable_cf_options);
InstallSuperVersionAndScheduleWork(cfd, &job_context->superversion_context,
mutable_cf_options);
if (made_progress) {
*made_progress = 1;
}
@ -573,8 +573,9 @@ Status DBImpl::CompactFilesImpl(
Status status = compaction_job.Install(*c->mutable_cf_options());
if (status.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(
c->column_family_data(), job_context, *c->mutable_cf_options());
InstallSuperVersionAndScheduleWork(
c->column_family_data(), &job_context->superversion_context,
*c->mutable_cf_options());
}
c->ReleaseCompactionFiles(s);
@ -707,8 +708,7 @@ Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
return Status::InvalidArgument("Target level exceeds number of levels");
}
std::unique_ptr<SuperVersion> superversion_to_free;
std::unique_ptr<SuperVersion> new_superversion(new SuperVersion());
SuperVersionContext sv_context(/* create_superversion */ true);
Status status;
@ -763,8 +763,7 @@ Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
status = versions_->LogAndApply(cfd, mutable_cf_options, &edit, &mutex_,
directories_.GetDbDir());
superversion_to_free.reset(InstallSuperVersionAndScheduleWork(
cfd, new_superversion.release(), mutable_cf_options));
InstallSuperVersionAndScheduleWork(cfd, &sv_context, mutable_cf_options);
ROCKS_LOG_DEBUG(immutable_db_options_.info_log, "[%s] LogAndApply: %s\n",
cfd->GetName().c_str(), status.ToString().data());
@ -776,6 +775,7 @@ Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
}
}
sv_context.Clean();
refitting_level_ = false;
return status;
@ -1576,8 +1576,9 @@ Status DBImpl::BackgroundCompaction(bool* made_progress,
status = versions_->LogAndApply(c->column_family_data(),
*c->mutable_cf_options(), c->edit(),
&mutex_, directories_.GetDbDir());
InstallSuperVersionAndScheduleWorkWrapper(
c->column_family_data(), job_context, *c->mutable_cf_options());
InstallSuperVersionAndScheduleWork(
c->column_family_data(), &job_context->superversion_context,
*c->mutable_cf_options());
ROCKS_LOG_BUFFER(log_buffer, "[%s] Deleted %d files\n",
c->column_family_data()->GetName().c_str(),
c->num_input_files(0));
@ -1622,8 +1623,9 @@ Status DBImpl::BackgroundCompaction(bool* made_progress,
*c->mutable_cf_options(), c->edit(),
&mutex_, directories_.GetDbDir());
// Use latest MutableCFOptions
InstallSuperVersionAndScheduleWorkWrapper(
c->column_family_data(), job_context, *c->mutable_cf_options());
InstallSuperVersionAndScheduleWork(
c->column_family_data(), &job_context->superversion_context,
*c->mutable_cf_options());
VersionStorageInfo::LevelSummaryStorage tmp;
c->column_family_data()->internal_stats()->IncBytesMoved(c->output_level(),
@ -1696,8 +1698,9 @@ Status DBImpl::BackgroundCompaction(bool* made_progress,
status = compaction_job.Install(*c->mutable_cf_options());
if (status.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(
c->column_family_data(), job_context, *c->mutable_cf_options());
InstallSuperVersionAndScheduleWork(
c->column_family_data(), &job_context->superversion_context,
*c->mutable_cf_options());
}
*made_progress = true;
}
@ -1863,30 +1866,21 @@ bool DBImpl::MCOverlap(ManualCompactionState* m, ManualCompactionState* m1) {
return true;
}
// JobContext gets created and destructed outside of the lock --
// SuperVersionContext gets created and destructed outside of the lock --
// we
// use this convinently to:
// * malloc one SuperVersion() outside of the lock -- new_superversion
// * delete SuperVersion()s outside of the lock -- superversions_to_free
//
// However, if InstallSuperVersionAndScheduleWork() gets called twice with the
// same job_context, we can't reuse the SuperVersion() that got
// same sv_context, we can't reuse the SuperVersion() that got
// malloced because
// first call already used it. In that rare case, we take a hit and create a
// new SuperVersion() inside of the mutex. We do similar thing
// for superversion_to_free
void DBImpl::InstallSuperVersionAndScheduleWorkWrapper(
ColumnFamilyData* cfd, JobContext* job_context,
const MutableCFOptions& mutable_cf_options) {
mutex_.AssertHeld();
SuperVersion* old_superversion = InstallSuperVersionAndScheduleWork(
cfd, job_context->new_superversion, mutable_cf_options);
job_context->new_superversion = nullptr;
job_context->superversions_to_free.push_back(old_superversion);
}
SuperVersion* DBImpl::InstallSuperVersionAndScheduleWork(
ColumnFamilyData* cfd, SuperVersion* new_sv,
void DBImpl::InstallSuperVersionAndScheduleWork(
ColumnFamilyData* cfd, SuperVersionContext* sv_context,
const MutableCFOptions& mutable_cf_options) {
mutex_.AssertHeld();
@ -1898,8 +1892,11 @@ SuperVersion* DBImpl::InstallSuperVersionAndScheduleWork(
old_sv->mutable_cf_options.max_write_buffer_number;
}
auto* old = cfd->InstallSuperVersion(
new_sv ? new_sv : new SuperVersion(), &mutex_, mutable_cf_options);
if (sv_context->new_superversion == nullptr) {
sv_context->NewSuperVersion();
}
cfd->InstallSuperVersion(sv_context, &mutex_,
mutable_cf_options);
// Whenever we install new SuperVersion, we might need to issue new flushes or
// compactions.
@ -1912,6 +1909,5 @@ SuperVersion* DBImpl::InstallSuperVersionAndScheduleWork(
max_total_in_memory_state_ - old_memtable_size +
mutable_cf_options.write_buffer_size *
mutable_cf_options.max_write_buffer_number;
return old;
}
} // namespace rocksdb

5
db/db_impl_experimental.cc
Unescape View File

@ -138,8 +138,9 @@ Status DBImpl::PromoteL0(ColumnFamilyHandle* column_family, int target_level) {
status = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
&edit, &mutex_, directories_.GetDbDir());
if (status.ok()) {
InstallSuperVersionAndScheduleWorkWrapper(
cfd, &job_context, *cfd->GetLatestMutableCFOptions());
InstallSuperVersionAndScheduleWork(
cfd, &job_context.superversion_context,
*cfd->GetLatestMutableCFOptions());
}
} // lock released here
LogFlush(immutable_db_options_.info_log);

6
db/db_impl_open.cc
Unescape View File

@ -1046,10 +1046,12 @@ Status DB::Open(const DBOptions& db_options, const std::string& dbname,
}
}
if (s.ok()) {
SuperVersionContext sv_context(/* create_superversion */ true);
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
delete impl->InstallSuperVersionAndScheduleWork(
cfd, nullptr, *cfd->GetLatestMutableCFOptions());
impl->InstallSuperVersionAndScheduleWork(
cfd, &sv_context, *cfd->GetLatestMutableCFOptions());
}
sv_context.Clean();
if (impl->concurrent_prepare_) {
impl->log_write_mutex_.Lock();
}

5
db/db_impl_readonly.cc
Unescape View File

@ -140,6 +140,7 @@ Status DB::OpenForReadOnly(
*dbptr = nullptr;
handles->clear();
SuperVersionContext sv_context(/* create_superversion */ true);
DBImplReadOnly* impl = new DBImplReadOnly(db_options, dbname);
impl->mutex_.Lock();
Status s = impl->Recover(column_families, true /* read only */,
@ -158,10 +159,12 @@ Status DB::OpenForReadOnly(
}
if (s.ok()) {
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
delete cfd->InstallSuperVersion(new SuperVersion(), &impl->mutex_);
sv_context.NewSuperVersion();
cfd->InstallSuperVersion(&sv_context, &impl->mutex_);
}
}
impl->mutex_.Unlock();
sv_context.Clean();
if (s.ok()) {
*dbptr = impl;
for (auto* h : *handles) {

7
db/db_impl_write.cc
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@ -1090,7 +1090,6 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
}
uint64_t new_log_number =
creating_new_log ? versions_->NewFileNumber() : logfile_number_;
SuperVersion* new_superversion = nullptr;
const MutableCFOptions mutable_cf_options = *cfd->GetLatestMutableCFOptions();
// Set memtable_info for memtable sealed callback
@ -1146,7 +1145,7 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
if (s.ok()) {
SequenceNumber seq = versions_->LastSequence();
new_mem = cfd->ConstructNewMemtable(mutable_cf_options, seq);
new_superversion = new SuperVersion();
context->superversion_context.NewSuperVersion();
}
#ifndef ROCKSDB_LITE
@ -1204,8 +1203,8 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
cfd->imm()->Add(cfd->mem(), &context->memtables_to_free_);
new_mem->Ref();
cfd->SetMemtable(new_mem);
context->superversions_to_free_.push_back(InstallSuperVersionAndScheduleWork(
cfd, new_superversion, mutable_cf_options));
InstallSuperVersionAndScheduleWork(cfd, &context->superversion_context,
mutable_cf_options);
if (concurrent_prepare_) {
nonmem_write_thread_.ExitUnbatched(&nonmem_w);
}

21
db/db_test.cc
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@ -5160,6 +5160,19 @@ TEST_F(DBTest, HardLimit) {
}
#ifndef ROCKSDB_LITE
class WriteStallListener : public EventListener {
public:
WriteStallListener() : condition_(WriteStallCondition::kNormal) {}
void OnStallConditionsChanged(const WriteStallInfo& info) override {
condition_ = info.condition.cur;
}
bool CheckCondition(WriteStallCondition expected) {
return expected == condition_;
}
private:
WriteStallCondition condition_;
};
TEST_F(DBTest, SoftLimit) {
Options options = CurrentOptions();
options.env = env_;
@ -5175,6 +5188,8 @@ TEST_F(DBTest, SoftLimit) {
options.max_bytes_for_level_multiplier = 10;
options.max_background_compactions = 1;
options.compression = kNoCompression;
WriteStallListener* listener = new WriteStallListener();
options.listeners.emplace_back(listener);
Reopen(options);
@ -5214,6 +5229,7 @@ TEST_F(DBTest, SoftLimit) {
Flush();
}
ASSERT_TRUE(dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kDelayed));
sleeping_task_low.WakeUp();
sleeping_task_low.WaitUntilDone();
@ -5224,6 +5240,7 @@ TEST_F(DBTest, SoftLimit) {
// The L1 file size is around 30KB.
ASSERT_EQ(NumTableFilesAtLevel(1), 1);
ASSERT_TRUE(!dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kNormal));
// Only allow one compactin going through.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
@ -5258,6 +5275,7 @@ TEST_F(DBTest, SoftLimit) {
// doesn't trigger soft_pending_compaction_bytes_limit
ASSERT_EQ(NumTableFilesAtLevel(1), 1);
ASSERT_TRUE(!dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kNormal));
// Create 3 L0 files, making score of L0 to be 3, higher than L0.
for (int i = 0; i < 3; i++) {
@ -5278,11 +5296,13 @@ TEST_F(DBTest, SoftLimit) {
// triggerring soft_pending_compaction_bytes_limit
ASSERT_EQ(NumTableFilesAtLevel(1), 1);
ASSERT_TRUE(dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kDelayed));
sleeping_task_low.WakeUp();
sleeping_task_low.WaitUntilSleeping();
ASSERT_TRUE(!dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kNormal));
// shrink level base so L2 will hit soft limit easier.
ASSERT_OK(dbfull()->SetOptions({
@ -5292,6 +5312,7 @@ TEST_F(DBTest, SoftLimit) {
Put("", "");
Flush();
ASSERT_TRUE(dbfull()->TEST_write_controler().NeedsDelay());
ASSERT_TRUE(listener->CheckCondition(WriteStallCondition::kDelayed));
sleeping_task_low.WaitUntilSleeping();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();

85
db/job_context.h
Unescape View File

@ -13,17 +13,77 @@
#include <vector>
#include "db/log_writer.h"
#include "db/column_family.h"
namespace rocksdb {
class MemTable;
struct SuperVersion;
struct SuperVersionContext {
struct WriteStallNotification {
WriteStallInfo write_stall_info;
const ImmutableCFOptions* immutable_cf_options;
};
autovector<SuperVersion*> superversions_to_free;
autovector<WriteStallNotification> write_stall_notifications;
unique_ptr<SuperVersion> new_superversion; // if nullptr no new superversion
explicit SuperVersionContext(bool create_superversion = false)
: new_superversion(create_superversion ? new SuperVersion() : nullptr) {}
void NewSuperVersion() {
new_superversion = unique_ptr<SuperVersion>(new SuperVersion());
}
inline bool HaveSomethingToDelete() const {
return superversions_to_free.size() > 0 ||
write_stall_notifications.size() > 0;
}
void PushWriteStallNotification(
WriteStallCondition old_cond, WriteStallCondition new_cond,
const std::string& name, const ImmutableCFOptions* ioptions) {
#ifndef ROCKSDB_LITE
WriteStallNotification notif;
notif.write_stall_info.cf_name = name;
notif.write_stall_info.condition.prev = old_cond;
notif.write_stall_info.condition.cur = new_cond;
notif.immutable_cf_options = ioptions;
write_stall_notifications.push_back(notif);
#endif // !ROCKSDB_LITE
}
void Clean() {
#ifndef ROCKSDB_LITE
// notify listeners on changed write stall conditions
for (auto& notif : write_stall_notifications) {
for (auto listener : notif.immutable_cf_options->listeners) {
listener->OnStallConditionsChanged(notif.write_stall_info);
}
}
write_stall_notifications.clear();
#endif // !ROCKSDB_LITE
// free superversions
for (auto s : superversions_to_free) {
delete s;
}
superversions_to_free.clear();
}
~SuperVersionContext() {
assert(write_stall_notifications.size() == 0);
assert(superversions_to_free.size() == 0);
}
};
struct JobContext {
inline bool HaveSomethingToDelete() const {
return full_scan_candidate_files.size() || sst_delete_files.size() ||
log_delete_files.size() || manifest_delete_files.size() ||
new_superversion != nullptr || superversions_to_free.size() > 0 ||
memtables_to_free.size() > 0 || logs_to_free.size() > 0;
memtables_to_free.size() > 0 || logs_to_free.size() > 0 ||
superversion_context.HaveSomethingToDelete();
}
// Structure to store information for candidate files to delete.
@ -65,12 +125,10 @@ struct JobContext {
// a list of memtables to be free
autovector<MemTable*> memtables_to_free;
autovector<SuperVersion*> superversions_to_free;
SuperVersionContext superversion_context;
autovector<log::Writer*> logs_to_free;
SuperVersion* new_superversion; // if nullptr no new superversion
// the current manifest_file_number, log_number and prev_log_number
// that corresponds to the set of files in 'live'.
uint64_t manifest_file_number;
@ -83,13 +141,13 @@ struct JobContext {
size_t num_alive_log_files = 0;
uint64_t size_log_to_delete = 0;
explicit JobContext(int _job_id, bool create_superversion = false) {
explicit JobContext(int _job_id, bool create_superversion = false)
: superversion_context(create_superversion) {
job_id = _job_id;
manifest_file_number = 0;
pending_manifest_file_number = 0;
log_number = 0;
prev_log_number = 0;
new_superversion = create_superversion ? new SuperVersion() : nullptr;
}
// For non-empty JobContext Clean() has to be called at least once before
@ -97,31 +155,22 @@ struct JobContext {
// unlocked DB mutex. Destructor doesn't call Clean() to avoid accidentally
// doing potentially slow Clean() with locked DB mutex.
void Clean() {
// free superversions
superversion_context.Clean();
// free pending memtables
for (auto m : memtables_to_free) {
delete m;
}
// free superversions
for (auto s : superversions_to_free) {
delete s;
}
for (auto l : logs_to_free) {
delete l;
}
// if new_superversion was not used, it will be non-nullptr and needs
// to be freed here
delete new_superversion;
memtables_to_free.clear();
superversions_to_free.clear();
logs_to_free.clear();
new_superversion = nullptr;
}
~JobContext() {
assert(memtables_to_free.size() == 0);
assert(superversions_to_free.size() == 0);
assert(new_superversion == nullptr);
assert(logs_to_free.size() == 0);
}
};

24
include/rocksdb/listener.h
Unescape View File

@ -86,6 +86,22 @@ enum class BackgroundErrorReason {
kMemTable,
};
enum class WriteStallCondition {
kNormal,
kDelayed,
kStopped,
};
struct WriteStallInfo {
// the name of the column family
std::string cf_name;
// state of the write controller
struct {
WriteStallCondition cur;
WriteStallCondition prev;
} condition;
};
#ifndef ROCKSDB_LITE
struct TableFileDeletionInfo {
@ -372,6 +388,14 @@ class EventListener {
virtual void OnBackgroundError(BackgroundErrorReason /* reason */,
Status* /* bg_error */) {}
// A call-back function for RocksDB which will be called whenever a change
// of superversion triggers a change of the stall conditions.
//
// Note that the this function must be implemented in a way such that
// it should not run for an extended period of time before the function
// returns. Otherwise, RocksDB may be blocked.
virtual void OnStallConditionsChanged(const WriteStallInfo& /*info*/) {}
// Factory method to return CompactionEventListener. If multiple listeners
// provides CompactionEventListner, only the first one will be used.
virtual CompactionEventListener* GetCompactionEventListener() {

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