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Deprecate WriteOptions::timeout_hint_us

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Summary:
In one of our recent meetings, we discussed deprecating features that are not being actively used. One of those features, at least within Facebook, is timeout_hint. The feature is really nicely implemented, but if nobody needs it, we should remove it from our code-base (until we get a valid use-case). Some arguments:
* Less code == better icache hit rate, smaller builds, simpler code
* The motivation for adding timeout_hint_us was to work-around RocksDB's stall issue. However, we're currently addressing the stall issue itself (see @sdong's recent work on stall write_rate), so we should never see sharp lock-ups in the future.
* Nobody is using the feature within Facebook's code-base. Googling for `timeout_hint_us` also doesn't yield any users.

Test Plan: make check

Reviewers: anthony, kradhakrishnan, sdong, yhchiang

Reviewed By: yhchiang

Subscribers: sdong, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D41937
main
Igor Canadi 9 years ago
parent ae29495e4b
commit 5aea98ddd8
12 changed files with 106 additions and 346 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. 5
      HISTORY.md
  2. 84
      db/db_impl.cc
  3. 2
      db/db_impl.h
  4. 4
      db/db_impl_debug.cc
  5. 263
      db/db_test.cc
  6. 18
      db/listener_test.cc
  7. 50
      db/write_thread.cc
  8. 6
      db/write_thread.h
  9. 10
      include/rocksdb/options.h
  10. 1
      include/rocksdb/statistics.h
  11. 6
      include/rocksdb/status.h
  12. 3
      util/status.cc

5
HISTORY.md
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@ -1,5 +1,10 @@
# Rocksdb Change Log
## Unreleased
### Public API changes
* Deprecated WriteOptions::timeout_hint_us. We no longer support write timeout. If you really need this option, talk to us and we might consider returning it.
## 3.12.0 (7/2/2015)
### New Features
* Added experimental support for optimistic transactions. See include/rocksdb/utilities/optimistic_transaction.h for more info.

84
db/db_impl.cc
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@ -2019,8 +2019,8 @@ Status DBImpl::FlushMemTable(ColumnFamilyData* cfd,
}
WriteThread::Writer w(&mutex_);
s = write_thread_.EnterWriteThread(&w, 0);
assert(s.ok() && !w.done); // No timeout and nobody should do our job
write_thread_.EnterWriteThread(&w);
assert(!w.done); // Nobody should do our job
// SwitchMemtable() will release and reacquire mutex
// during execution
@ -3014,8 +3014,8 @@ Status DBImpl::CreateColumnFamily(const ColumnFamilyOptions& cf_options,
Options opt(db_options_, cf_options);
{ // write thread
WriteThread::Writer w(&mutex_);
s = write_thread_.EnterWriteThread(&w, 0);
assert(s.ok() && !w.done); // No timeout and nobody should do our job
write_thread_.EnterWriteThread(&w);
assert(!w.done); // Nobody should do our job
// LogAndApply will both write the creation in MANIFEST and create
// ColumnFamilyData object
s = versions_->LogAndApply(
@ -3076,8 +3076,8 @@ Status DBImpl::DropColumnFamily(ColumnFamilyHandle* column_family) {
if (s.ok()) {
// we drop column family from a single write thread
WriteThread::Writer w(&mutex_);
s = write_thread_.EnterWriteThread(&w, 0);
assert(s.ok() && !w.done); // No timeout and nobody should do our job
write_thread_.EnterWriteThread(&w);
assert(!w.done); // Nobody should do our job
s = versions_->LogAndApply(cfd, *cfd->GetLatestMutableCFOptions(),
&edit, &mutex_);
write_thread_.ExitWriteThread(&w, &w, s);
@ -3364,6 +3364,9 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
if (my_batch == nullptr) {
return Status::Corruption("Batch is nullptr!");
}
if (write_options.timeout_hint_us != 0) {
return Status::InvalidArgument("timeout_hint_us is deprecated");
}
Status status;
bool xfunc_attempted_write = false;
@ -3384,16 +3387,6 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
w.in_batch_group = false;
w.done = false;
w.has_callback = (callback != nullptr) ? true : false;
w.timeout_hint_us = write_options.timeout_hint_us;
uint64_t expiration_time = 0;
bool has_timeout = false;
if (w.timeout_hint_us == 0) {
w.timeout_hint_us = WriteThread::kNoTimeOut;
} else {
expiration_time = env_->NowMicros() + w.timeout_hint_us;
has_timeout = true;
}
if (!write_options.disableWAL) {
RecordTick(stats_, WRITE_WITH_WAL);
@ -3408,13 +3401,7 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
default_cf_internal_stats_->AddDBStats(InternalStats::WRITE_WITH_WAL, 1);
}
status = write_thread_.EnterWriteThread(&w, expiration_time);
assert(status.ok() || status.IsTimedOut());
if (status.IsTimedOut()) {
mutex_.Unlock();
RecordTick(stats_, WRITE_TIMEDOUT);
return Status::TimedOut();
}
write_thread_.EnterWriteThread(&w);
if (w.done) { // write was done by someone else
default_cf_internal_stats_->AddDBStats(InternalStats::WRITE_DONE_BY_OTHER,
1);
@ -3500,15 +3487,10 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
// 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_, expiration_time);
status = DelayWrite(last_batch_group_size_);
PERF_TIMER_START(write_pre_and_post_process_time);
}
if (UNLIKELY(status.ok() && has_timeout &&
env_->NowMicros() > expiration_time)) {
status = Status::TimedOut();
}
uint64_t last_sequence = versions_->LastSequence();
WriteThread::Writer* last_writer = &w;
autovector<WriteBatch*> write_batch_group;
@ -3627,7 +3609,7 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
mutex_.Lock();
}
if (db_options_.paranoid_checks && !status.ok() && !status.IsTimedOut() &&
if (db_options_.paranoid_checks && !status.ok() &&
!status.IsBusy() && bg_error_.ok()) {
bg_error_ = status; // stop compaction & fail any further writes
}
@ -3637,56 +3619,30 @@ Status DBImpl::WriteImpl(const WriteOptions& write_options,
mutex_.Unlock();
if (status.IsTimedOut()) {
RecordTick(stats_, WRITE_TIMEDOUT);
}
return status;
}
// REQUIRES: mutex_ is held
// REQUIRES: this thread is currently at the front of the writer queue
Status DBImpl::DelayWrite(uint64_t num_bytes, uint64_t expiration_time) {
Status DBImpl::DelayWrite(uint64_t num_bytes) {
uint64_t time_delayed = 0;
bool delayed = false;
bool timed_out = false;
{
StopWatch sw(env_, stats_, WRITE_STALL, &time_delayed);
bool has_timeout = (expiration_time > 0);
auto delay = write_controller_.GetDelay(env_, num_bytes);
if (delay > 0) {
mutex_.Unlock();
delayed = true;
// hopefully we don't have to sleep more than 2 billion microseconds
TEST_SYNC_POINT("DBImpl::DelayWrite:Sleep");
if (has_timeout) {
auto time_now = env_->NowMicros();
if (time_now + delay >= expiration_time) {
if (expiration_time > time_now) {
env_->SleepForMicroseconds(
static_cast<int>(expiration_time - time_now));
}
timed_out = true;
}
}
if (!timed_out) {
env_->SleepForMicroseconds(static_cast<int>(delay));
}
// hopefully we don't have to sleep more than 2 billion microseconds
env_->SleepForMicroseconds(static_cast<int>(delay));
mutex_.Lock();
}
while (!timed_out && bg_error_.ok() && write_controller_.IsStopped()) {
while (bg_error_.ok() && write_controller_.IsStopped()) {
delayed = true;
if (has_timeout) {
TEST_SYNC_POINT("DBImpl::DelayWrite:TimedWait");
bg_cv_.TimedWait(expiration_time);
if (env_->NowMicros() > expiration_time) {
timed_out = true;
break;
}
} else {
bg_cv_.Wait();
}
TEST_SYNC_POINT("DBImpl::DelayWrite:Wait");
bg_cv_.Wait();
}
}
if (delayed) {
@ -3695,10 +3651,6 @@ Status DBImpl::DelayWrite(uint64_t num_bytes, uint64_t expiration_time) {
RecordTick(stats_, STALL_MICROS, time_delayed);
}
if (timed_out) {
return Status::TimedOut();
}
return bg_error_;
}

2
db/db_impl.h
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@ -437,7 +437,7 @@ class DBImpl : public DB {
// num_bytes: for slowdown case, delay time is calculated based on
// `num_bytes` going through.
Status DelayWrite(uint64_t num_bytes, uint64_t expiration_time);
Status DelayWrite(uint64_t num_bytes);
Status ScheduleFlushes(WriteContext* context);

4
db/db_impl_debug.cc
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@ -132,8 +132,8 @@ void DBImpl::TEST_UnlockMutex() {
void* DBImpl::TEST_BeginWrite() {
auto w = new WriteThread::Writer(&mutex_);
Status s = write_thread_.EnterWriteThread(w, 0);
assert(s.ok() && !w->done); // No timeout and nobody should do our job
write_thread_.EnterWriteThread(w);
assert(!w->done); // Nobody should do our job
return reinterpret_cast<void*>(w);
}

263
db/db_test.cc
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@ -1998,6 +1998,16 @@ class SleepingBackgroundTask {
bg_cv_.Wait();
}
}
bool WokenUp() {
MutexLock l(&mutex_);
return should_sleep_ == false;
}
void Reset() {
MutexLock l(&mutex_);
should_sleep_ = true;
done_with_sleep_ = false;
}
static void DoSleepTask(void* arg) {
reinterpret_cast<SleepingBackgroundTask*>(arg)->DoSleep();
@ -9152,157 +9162,15 @@ TEST_F(DBTest, FIFOCompactionTest) {
}
}
// verify that we correctly deprecated timeout_hint_us
TEST_F(DBTest, SimpleWriteTimeoutTest) {
// Block compaction thread, which will also block the flushes because
// max_background_flushes == 0, so flushes are getting executed by the
// compaction thread
env_->SetBackgroundThreads(1, Env::LOW);
SleepingBackgroundTask sleeping_task_low;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
Options options;
options.env = env_;
options.create_if_missing = true;
options.write_buffer_size = 100000;
options.max_background_flushes = 0;
options.max_write_buffer_number = 2;
options.max_total_wal_size = std::numeric_limits<uint64_t>::max();
WriteOptions write_opt;
write_opt.timeout_hint_us = 0;
DestroyAndReopen(options);
// fill the two write buffers
ASSERT_OK(Put(Key(1), Key(1) + std::string(100000, 'v'), write_opt));
ASSERT_OK(Put(Key(2), Key(2) + std::string(100000, 'v'), write_opt));
// As the only two write buffers are full in this moment, the third
// Put is expected to be timed-out.
write_opt.timeout_hint_us = 50;
ASSERT_TRUE(
Put(Key(3), Key(3) + std::string(100000, 'v'), write_opt).IsTimedOut());
sleeping_task_low.WakeUp();
sleeping_task_low.WaitUntilDone();
ASSERT_OK(Put(Key(1), Key(1) + std::string(100, 'v'), write_opt));
write_opt.timeout_hint_us = 10;
ASSERT_NOK(Put(Key(1), Key(1) + std::string(100, 'v'), write_opt));
}
// Multi-threaded Timeout Test
namespace {
static const int kValueSize = 1000;
static const int kWriteBufferSize = 100000;
struct TimeoutWriterState {
int id;
DB* db;
std::atomic<bool> done;
std::map<int, std::string> success_kvs;
};
static void RandomTimeoutWriter(void* arg) {
TimeoutWriterState* state = reinterpret_cast<TimeoutWriterState*>(arg);
static const uint64_t kTimerBias = 50;
int thread_id = state->id;
DB* db = state->db;
Random rnd(1000 + thread_id);
WriteOptions write_opt;
write_opt.timeout_hint_us = 500;
int timeout_count = 0;
int num_keys = kNumKeys * 5;
for (int k = 0; k < num_keys; ++k) {
int key = k + thread_id * num_keys;
std::string value = DBTestBase::RandomString(&rnd, kValueSize);
// only the second-half is randomized
if (k > num_keys / 2) {
switch (rnd.Next() % 5) {
case 0:
write_opt.timeout_hint_us = 500 * thread_id;
break;
case 1:
write_opt.timeout_hint_us = num_keys - k;
break;
case 2:
write_opt.timeout_hint_us = 1;
break;
default:
write_opt.timeout_hint_us = 0;
state->success_kvs.insert({key, value});
}
}
uint64_t time_before_put = db->GetEnv()->NowMicros();
Status s = db->Put(write_opt, DBTestBase::Key(key), value);
uint64_t put_duration = db->GetEnv()->NowMicros() - time_before_put;
if (write_opt.timeout_hint_us == 0 ||
put_duration + kTimerBias < write_opt.timeout_hint_us) {
ASSERT_OK(s);
}
if (s.IsTimedOut()) {
timeout_count++;
ASSERT_GT(put_duration + kTimerBias, write_opt.timeout_hint_us);
}
}
state->done = true;
}
TEST_F(DBTest, MTRandomTimeoutTest) {
Options options;
options.env = env_;
options.create_if_missing = true;
options.max_write_buffer_number = 2;
options.compression = kNoCompression;
options.level0_slowdown_writes_trigger = 10;
options.level0_stop_writes_trigger = 20;
options.write_buffer_size = kWriteBufferSize;
DestroyAndReopen(options);
TimeoutWriterState thread_states[kNumThreads];
for (int tid = 0; tid < kNumThreads; ++tid) {
thread_states[tid].id = tid;
thread_states[tid].db = db_;
thread_states[tid].done = false;
env_->StartThread(RandomTimeoutWriter, &thread_states[tid]);
}
for (int tid = 0; tid < kNumThreads; ++tid) {
while (thread_states[tid].done == false) {
env_->SleepForMicroseconds(100000);
}
}
Flush();
for (int tid = 0; tid < kNumThreads; ++tid) {
auto& success_kvs = thread_states[tid].success_kvs;
for (auto it = success_kvs.begin(); it != success_kvs.end(); ++it) {
ASSERT_EQ(Get(Key(it->first)), it->second);
}
}
}
TEST_F(DBTest, Level0StopWritesTest) {
Options options = CurrentOptions();
options.level0_slowdown_writes_trigger = 2;
options.level0_stop_writes_trigger = 4;
options.disable_auto_compactions = true;
options.max_mem_compaction_level = 0;
Reopen(options);
// create 4 level0 tables
for (int i = 0; i < 4; ++i) {
Put("a", "b");
Flush();
}
WriteOptions woptions;
woptions.timeout_hint_us = 30 * 1000; // 30 ms
Status s = Put("a", "b", woptions);
ASSERT_TRUE(s.IsTimedOut());
}
} // anonymous namespace
/*
* This test is not reliable enough as it heavily depends on disk behavior.
*/
@ -9896,8 +9764,8 @@ TEST_F(DBTest, DynamicMemtableOptions) {
// max_background_flushes == 0, so flushes are getting executed by the
// compaction thread
env_->SetBackgroundThreads(1, Env::LOW);
SleepingBackgroundTask sleeping_task_low1;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low1,
SleepingBackgroundTask sleeping_task_low;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
// Start from scratch and disable compaction/flush. Flush can only happen
// during compaction but trigger is pretty high
@ -9905,28 +9773,24 @@ TEST_F(DBTest, DynamicMemtableOptions) {
options.disable_auto_compactions = true;
DestroyAndReopen(options);
// Put until timeout, bounded by 256 puts. We should see timeout at ~128KB
// Put until writes are stopped, bounded by 256 puts. We should see stop at
// ~128KB
int count = 0;
Random rnd(301);
WriteOptions wo;
wo.timeout_hint_us = 100000; // Reasonabley long timeout to make sure sleep
// triggers but not forever.
std::atomic<int> sleep_count(0);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::DelayWrite:TimedWait",
[&](void* arg) { sleep_count.fetch_add(1); });
"DBImpl::DelayWrite:Wait",
[&](void* arg) { sleeping_task_low.WakeUp(); });
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
while (Put(Key(count), RandomString(&rnd, 1024), wo).ok() && count < 256) {
while (!sleeping_task_low.WokenUp() && count < 256) {
ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), WriteOptions()));
count++;
}
ASSERT_GT(sleep_count.load(), 0);
ASSERT_GT(static_cast<double>(count), 128 * 0.8);
ASSERT_LT(static_cast<double>(count), 128 * 1.2);
sleeping_task_low1.WakeUp();
sleeping_task_low1.WaitUntilDone();
sleeping_task_low.WaitUntilDone();
// Increase
ASSERT_OK(dbfull()->SetOptions({
@ -9935,23 +9799,21 @@ TEST_F(DBTest, DynamicMemtableOptions) {
// Clean up memtable and L0
dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
SleepingBackgroundTask sleeping_task_low2;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low2,
sleeping_task_low.Reset();
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
count = 0;
sleep_count.store(0);
while (Put(Key(count), RandomString(&rnd, 1024), wo).ok() && count < 1024) {
while (!sleeping_task_low.WokenUp() && count < 1024) {
ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), WriteOptions()));
count++;
}
ASSERT_GT(sleep_count.load(), 0);
// Windows fails this test. Will tune in the future and figure out
// approp number
// Windows fails this test. Will tune in the future and figure out
// approp number
#ifndef OS_WIN
ASSERT_GT(static_cast<double>(count), 512 * 0.8);
ASSERT_LT(static_cast<double>(count), 512 * 1.2);
#endif
sleeping_task_low2.WakeUp();
sleeping_task_low2.WaitUntilDone();
sleeping_task_low.WaitUntilDone();
// Decrease
ASSERT_OK(dbfull()->SetOptions({
@ -9960,24 +9822,22 @@ TEST_F(DBTest, DynamicMemtableOptions) {
// Clean up memtable and L0
dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
SleepingBackgroundTask sleeping_task_low3;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low3,
sleeping_task_low.Reset();
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
count = 0;
sleep_count.store(0);
while (Put(Key(count), RandomString(&rnd, 1024), wo).ok() && count < 1024) {
while (!sleeping_task_low.WokenUp() && count < 1024) {
ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), WriteOptions()));
count++;
}
ASSERT_GT(sleep_count.load(), 0);
// Windows fails this test. Will tune in the future and figure out
// approp number
// Windows fails this test. Will tune in the future and figure out
// approp number
#ifndef OS_WIN
ASSERT_GT(static_cast<double>(count), 256 * 0.8);
ASSERT_LT(static_cast<double>(count), 266 * 1.2);
#endif
sleeping_task_low3.WakeUp();
sleeping_task_low3.WaitUntilDone();
sleeping_task_low.WaitUntilDone();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
@ -10760,50 +10620,61 @@ TEST_F(DBTest, DynamicCompactionOptions) {
// Test level0_stop_writes_trigger.
// Clean up memtable and L0. Block compaction threads. If continue to write
// and flush memtables. We should see put timeout after 8 memtable flushes
// and flush memtables. We should see put stop after 8 memtable flushes
// since level0_stop_writes_trigger = 8
dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
// Block compaction
SleepingBackgroundTask sleeping_task_low1;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low1,
SleepingBackgroundTask sleeping_task_low;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::DelayWrite:Wait",
[&](void* arg) { sleeping_task_low.WakeUp(); });
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
int count = 0;
Random rnd(301);
WriteOptions wo;
wo.timeout_hint_us = 10000;
while (Put(Key(count), RandomString(&rnd, 1024), wo).ok() && count < 64) {
while (count < 64) {
ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), wo));
if (sleeping_task_low.WokenUp()) {
break;
}
dbfull()->TEST_FlushMemTable(true);
count++;
}
// Stop trigger = 8
ASSERT_EQ(count, 8);
// Unblock
sleeping_task_low1.WakeUp();
sleeping_task_low1.WaitUntilDone();
sleeping_task_low.WaitUntilDone();
// Now reduce level0_stop_writes_trigger to 6. Clear up memtables and L0.
// Block compaction thread again. Perform the put and memtable flushes
// until we see timeout after 6 memtable flushes.
// until we see the stop after 6 memtable flushes.
ASSERT_OK(dbfull()->SetOptions({
{"level0_stop_writes_trigger", "6"}
}));
dbfull()->CompactRange(CompactRangeOptions(), nullptr, nullptr);
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
// Block compaction
SleepingBackgroundTask sleeping_task_low2;
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low2,
// Block compaction again
sleeping_task_low.Reset();
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
count = 0;
while (Put(Key(count), RandomString(&rnd, 1024), wo).ok() && count < 64) {
while (count < 64) {
ASSERT_OK(Put(Key(count), RandomString(&rnd, 1024), wo));
if (sleeping_task_low.WokenUp()) {
break;
}
dbfull()->TEST_FlushMemTable(true);
count++;
}
ASSERT_EQ(count, 6);
// Unblock
sleeping_task_low2.WakeUp();
sleeping_task_low2.WaitUntilDone();
sleeping_task_low.WaitUntilDone();
// Test disable_auto_compactions
// Compaction thread is unblocked but auto compaction is disabled. Write
@ -10818,7 +10689,7 @@ TEST_F(DBTest, DynamicCompactionOptions) {
for (int i = 0; i < 4; ++i) {
ASSERT_OK(Put(Key(i), RandomString(&rnd, 1024)));
// Wait for compaction so that put won't timeout
// Wait for compaction so that put won't stop
dbfull()->TEST_FlushMemTable(true);
}
dbfull()->TEST_WaitForCompact();
@ -10834,7 +10705,7 @@ TEST_F(DBTest, DynamicCompactionOptions) {
for (int i = 0; i < 4; ++i) {
ASSERT_OK(Put(Key(i), RandomString(&rnd, 1024)));
// Wait for compaction so that put won't timeout
// Wait for compaction so that put won't stop
dbfull()->TEST_FlushMemTable(true);
}
dbfull()->TEST_WaitForCompact();
@ -10877,6 +10748,8 @@ TEST_F(DBTest, DynamicCompactionOptions) {
ASSERT_EQ(NumTableFilesAtLevel(0), 1);
ASSERT_EQ(NumTableFilesAtLevel(1), 1);
ASSERT_EQ(NumTableFilesAtLevel(2), 1);
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBTest, FileCreationRandomFailure) {
@ -12265,10 +12138,6 @@ TEST_F(DBTest, DelayedWriteRate) {
// Spread the size range to more.
size_t entry_size = rand_num * rand_num * rand_num;
WriteOptions wo;
// For a small chance, set a timeout.
if (rnd.Uniform(20) == 6) {
wo.timeout_hint_us = 1500;
}
Put(Key(i), std::string(entry_size, 'x'), wo);
estimated_total_size += entry_size + 20;
// Ocassionally sleep a while

18
db/listener_test.cc
Unescape View File

@ -438,10 +438,13 @@ TEST_F(EventListenerTest, DisableBGCompaction) {
options.enable_thread_tracking = true;
#endif // ROCKSDB_USING_THREAD_STATUS
TestFlushListener* listener = new TestFlushListener(options.env);
const int kCompactionTrigger = 1;
const int kSlowdownTrigger = 5;
const int kStopTrigger = 10;
const int kStopTrigger = 100;
options.level0_file_num_compaction_trigger = kCompactionTrigger;
options.level0_slowdown_writes_trigger = kSlowdownTrigger;
options.level0_stop_writes_trigger = kStopTrigger;
options.max_write_buffer_number = 10;
options.listeners.emplace_back(listener);
// BG compaction is disabled. Number of L0 files will simply keeps
// increasing in this test.
@ -450,18 +453,17 @@ TEST_F(EventListenerTest, DisableBGCompaction) {
options.write_buffer_size = 100000; // Small write buffer
CreateAndReopenWithCF({"pikachu"}, &options);
WriteOptions wopts;
wopts.timeout_hint_us = 100000;
ColumnFamilyMetaData cf_meta;
db_->GetColumnFamilyMetaData(handles_[1], &cf_meta);
// keep writing until writes are forced to stop.
for (int i = 0; static_cast<int>(cf_meta.file_count) < kStopTrigger; ++i) {
Put(1, ToString(i), std::string(100000, 'x'), wopts);
db_->Flush(FlushOptions());
for (int i = 0; static_cast<int>(cf_meta.file_count) < kSlowdownTrigger * 10;
++i) {
Put(1, ToString(i), std::string(10000, 'x'), WriteOptions());
db_->Flush(FlushOptions(), handles_[1]);
db_->GetColumnFamilyMetaData(handles_[1], &cf_meta);
}
ASSERT_GE(listener->slowdown_count, kStopTrigger - kSlowdownTrigger);
ASSERT_GE(listener->stop_count, 1);
ASSERT_GE(listener->slowdown_count, kSlowdownTrigger * 9);
}
} // namespace rocksdb

50
db/write_thread.cc
Unescape View File

@ -7,8 +7,7 @@
namespace rocksdb {
Status WriteThread::EnterWriteThread(WriteThread::Writer* w,
uint64_t expiration_time) {
void WriteThread::EnterWriteThread(WriteThread::Writer* w) {
// the following code block pushes the current writer "w" into the writer
// queue "writers_" and wait until one of the following conditions met:
// 1. the job of "w" has been done by some other writers.
@ -16,48 +15,9 @@ Status WriteThread::EnterWriteThread(WriteThread::Writer* w,
// 3. "w" timed-out.
writers_.push_back(w);
bool timed_out = false;
while (!w->done && w != writers_.front()) {
if (expiration_time == 0) {
w->cv.Wait();
} else if (w->cv.TimedWait(expiration_time)) {
if (w->in_batch_group) {
// then it means the front writer is currently doing the
// write on behalf of this "timed-out" writer. Then it
// should wait until the write completes.
expiration_time = 0;
} else {
timed_out = true;
break;
}
}
}
if (timed_out) {
#ifndef NDEBUG
bool found = false;
#endif
for (auto iter = writers_.begin(); iter != writers_.end(); iter++) {
if (*iter == w) {
writers_.erase(iter);
#ifndef NDEBUG
found = true;
#endif
break;
}
}
#ifndef NDEBUG
assert(found);
#endif
// writers_.front() might still be in cond_wait without a time-out.
// As a result, we need to signal it to wake it up. Otherwise no
// one else will wake him up, and RocksDB will hang.
if (!writers_.empty()) {
writers_.front()->cv.Signal();
}
return Status::TimedOut();
w->cv.Wait();
}
return Status::OK();
}
void WriteThread::ExitWriteThread(WriteThread::Writer* w,
@ -128,12 +88,6 @@ size_t WriteThread::BuildBatchGroup(
break;
}
if (w->timeout_hint_us < first->timeout_hint_us) {
// Do not include those writes with shorter timeout. Otherwise, we might
// execute a write that should instead be aborted because of timeout.
break;
}
if (w->has_callback) {
// Do not include writes which may be aborted if the callback does not
// succeed.

6
db/write_thread.h
Unescape View File

@ -18,7 +18,6 @@ namespace rocksdb {
class WriteThread {
public:
static const uint64_t kNoTimeOut = port::kMaxUint64;
// Information kept for every waiting writer
struct Writer {
Status status;
@ -28,7 +27,6 @@ class WriteThread {
bool in_batch_group;
bool done;
bool has_callback;
uint64_t timeout_hint_us;
InstrumentedCondVar cv;
explicit Writer(InstrumentedMutex* mu)
@ -38,7 +36,6 @@ class WriteThread {
in_batch_group(false),
done(false),
has_callback(false),
timeout_hint_us(kNoTimeOut),
cv(mu) {}
};
@ -52,10 +49,9 @@ class WriteThread {
// for examples), so check it via w.done before applying changes.
//
// Writer* w: writer to be placed in the queue
// uint64_t expiration_time: maximum time to be in the queue
// See also: ExitWriteThread
// REQUIRES: db mutex held
Status EnterWriteThread(Writer* w, uint64_t expiration_time);
void EnterWriteThread(Writer* w);
// After doing write job, we need to remove already used writers from
// writers_ queue and notify head of the queue about it.

10
include/rocksdb/options.h
Unescape View File

@ -1212,15 +1212,7 @@ struct WriteOptions {
// and the write may got lost after a crash.
bool disableWAL;
// If non-zero, then associated write waiting longer than the specified
// time MAY be aborted and returns Status::TimedOut. A write that takes
// less than the specified time is guaranteed to not fail with
// Status::TimedOut.
//
// The number of times a write call encounters a timeout is recorded in
// Statistics.WRITE_TIMEDOUT
//
// Default: 0
// The option is deprecated. It's not used anymore.
uint64_t timeout_hint_us;
// If true and if user is trying to write to column families that don't exist

1
include/rocksdb/statistics.h
Unescape View File

@ -206,7 +206,6 @@ const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
{WAL_FILE_BYTES, "rocksdb.wal.bytes"},
{WRITE_DONE_BY_SELF, "rocksdb.write.self"},
{WRITE_DONE_BY_OTHER, "rocksdb.write.other"},
{WRITE_TIMEDOUT, "rocksdb.write.timedout"},
{WRITE_WITH_WAL, "rocksdb.write.wal"},
{FLUSH_WRITE_BYTES, "rocksdb.flush.write.bytes"},
{COMPACT_READ_BYTES, "rocksdb.compact.read.bytes"},

6
include/rocksdb/status.h
Unescape View File

@ -68,12 +68,6 @@ class Status {
const Slice& msg2 = Slice()) {
return Status(kShutdownInProgress, msg, msg2);
}
static Status TimedOut() {
return Status(kTimedOut);
}
static Status TimedOut(const Slice& msg, const Slice& msg2 = Slice()) {
return Status(kTimedOut, msg, msg2);
}
static Status Aborted() {
return Status(kAborted);
}

3
util/status.cc
Unescape View File

@ -67,9 +67,6 @@ std::string Status::ToString() const {
case kShutdownInProgress:
type = "Shutdown in progress: ";
break;
case kTimedOut:
type = "Operation timed out: ";
break;
case kAborted:
type = "Operation aborted: ";
break;

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