Add PauseBackgroundWork() to db_stress (#6148)

Summary:
Worker thread will occasionally call PauseBackgroundWork(),
briefly sleep (to avoid stalling itself) and then call
ContinueBackgroundWork().
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6148

Test Plan:
some running of 'make blackbox_crash_test' with temporary
printf output to confirm code occasionally reached.

Differential Revision: D18913886

Pulled By: pdillinger

fbshipit-source-id: ae9356a803390929f3165dfb6a00194692ba92be
This commit is contained in:
Peter Dillinger 2019-12-10 15:45:25 -08:00 committed by Facebook Github Bot
parent 2bb5fc1280
commit a653857178
4 changed files with 28 additions and 0 deletions

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@ -168,6 +168,7 @@ DECLARE_int32(ingest_external_file_width);
DECLARE_int32(compact_files_one_in);
DECLARE_int32(compact_range_one_in);
DECLARE_int32(flush_one_in);
DECLARE_int32(pause_background_one_in);
DECLARE_int32(compact_range_width);
DECLARE_int32(acquire_snapshot_one_in);
DECLARE_bool(compare_full_db_state_snapshot);

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@ -401,6 +401,10 @@ DEFINE_int32(flush_one_in, 0,
"If non-zero, then Flush() will be called once for every N ops "
"on average. 0 indicates calls to Flush() are disabled.");
DEFINE_int32(pause_background_one_in, 0,
"If non-zero, then PauseBackgroundWork()+Continue will be called "
"once for every N ops on average. 0 disables.");
DEFINE_int32(compact_range_width, 10000,
"The width of the ranges passed to CompactRange().");

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@ -600,6 +600,28 @@ void StressTest::OperateDb(ThreadState* thread) {
}
}
if (FLAGS_pause_background_one_in > 0 &&
thread->rand.OneIn(FLAGS_pause_background_one_in)) {
Status status = db_->PauseBackgroundWork();
if (!status.ok()) {
VerificationAbort(shared, "PauseBackgroundWork status not OK",
status);
}
// To avoid stalling/deadlocking ourself in this thread, just
// sleep here during pause and let other threads do db operations.
// Sleep up to ~16 seconds (2**24 microseconds), but very skewed
// toward short pause. (1 chance in 25 of pausing >= 1s;
// 1 chance in 625 of pausing full 16s.)
int pwr2_micros =
std::min(thread->rand.Uniform(25), thread->rand.Uniform(25));
FLAGS_env->SleepForMicroseconds(1 << pwr2_micros);
status = db_->ContinueBackgroundWork();
if (!status.ok()) {
VerificationAbort(shared, "ContinueBackgroundWork status not OK",
status);
}
}
std::vector<int64_t> rand_keys = GenerateKeys(rand_key);
if (FLAGS_ingest_external_file_one_in > 0 &&

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@ -52,6 +52,7 @@ default_params = {
"nooverwritepercent": 1,
"open_files": lambda : random.choice([-1, 500000]),
"partition_filters": lambda: random.randint(0, 1),
"pause_background_one_in": 1000000,
"prefixpercent": 5,
"progress_reports": 0,
"readpercent": 45,