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Fix potential DB hang while using CompactFiles (#4940)

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Summary:
CompactFiles() may block auto compaction which could cuase DB hang when it
reachs level0_stop_writes_trigger.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4940

Differential Revision: D13929648

Pulled By: cooldoger

fbshipit-source-id: 10842df38df3bebf862cd1a120a88ce961fdd381
This commit is contained in:
Jay Zhuang 2019-02-05 11:20:37 -08:00 committed by Facebook Github Bot
parent 8fe073324f
commit c9a52cbdc8
2 changed files with 62 additions and 0 deletions
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1
db/db_impl_compaction_flush.cc
View file

@ -1023,6 +1023,7 @@ Status DBImpl::CompactFilesImpl(
if (bg_compaction_scheduled_ == 0) {
bg_cv_.SignalAll();
}
MaybeScheduleFlushOrCompaction();
TEST_SYNC_POINT("CompactFilesImpl:End");
return status;

61
db/db_test.cc
View file

@ -5440,6 +5440,67 @@ TEST_F(DBTest, AutomaticConflictsWithManualCompaction) {
dbfull()->TEST_WaitForCompact();
}
TEST_F(DBTest, CompactFilesShouldTriggerAutoCompaction) {
Options options = CurrentOptions();
options.max_background_compactions = 1;
options.level0_file_num_compaction_trigger = 4;
options.level0_slowdown_writes_trigger = 36;
options.level0_stop_writes_trigger = 36;
DestroyAndReopen(options);
// generate files for manual compaction
Random rnd(301);
for (int i = 0; i < 2; ++i) {
// put two keys to ensure no trivial move
for (int j = 0; j < 2; ++j) {
ASSERT_OK(Put(Key(j), RandomString(&rnd, 1024)));
}
ASSERT_OK(Flush());
}
rocksdb::ColumnFamilyMetaData cf_meta_data;
db_->GetColumnFamilyMetaData(db_->DefaultColumnFamily(), &cf_meta_data);
std::vector<std::string> input_files;
input_files.push_back(cf_meta_data.levels[0].files[0].name);
SyncPoint::GetInstance()->LoadDependency({
{"CompactFilesImpl:0",
"DBTest::CompactFilesShouldTriggerAutoCompaction:Begin"},
{"DBTest::CompactFilesShouldTriggerAutoCompaction:End",
"CompactFilesImpl:1"},
});
SyncPoint::GetInstance()->EnableProcessing();
port::Thread manual_compaction_thread([&]() {
auto s = db_->CompactFiles(CompactionOptions(),
db_->DefaultColumnFamily(), input_files, 0);
});
TEST_SYNC_POINT(
"DBTest::CompactFilesShouldTriggerAutoCompaction:Begin");
// generate enough files to trigger compaction
for (int i = 0; i < 20; ++i) {
for (int j = 0; j < 2; ++j) {
ASSERT_OK(Put(Key(j), RandomString(&rnd, 1024)));
}
ASSERT_OK(Flush());
}
db_->GetColumnFamilyMetaData(db_->DefaultColumnFamily(), &cf_meta_data);
ASSERT_GT(cf_meta_data.levels[0].files.size(),
options.level0_file_num_compaction_trigger);
TEST_SYNC_POINT(
"DBTest::CompactFilesShouldTriggerAutoCompaction:End");
manual_compaction_thread.join();
dbfull()->TEST_WaitForCompact();
db_->GetColumnFamilyMetaData(db_->DefaultColumnFamily(), &cf_meta_data);
ASSERT_LE(cf_meta_data.levels[0].files.size(),
options.level0_file_num_compaction_trigger);
}
// Github issue #595
// Large write batch with column families
TEST_F(DBTest, LargeBatchWithColumnFamilies) {