rocksdb/db
Baptiste Lemaire 7bed6595f3 Fix mempurge crash reported in #8958 (#9671)
Summary:
Change the `MemPurge` code to address a failure during a crash test reported in https://github.com/facebook/rocksdb/issues/8958.

### Details and results of the crash investigation:
These failures happened in a specific scenario where the list of immutable tables was composed of 2 or more memtables, and the last memtable was the output of a previous `Mempurge` operation. Because the `PickMemtablesToFlush` function included a sorting of the memtables (previous PR related to the Mempurge project), and because the `VersionEdit` of the flush class is piggybacked onto a single one of these memtables, the `VersionEdit` was not properly selected and applied to the `VersionSet` of the DB. Since the `VersionSet` was not edited properly, the database was losing track of the SST file created during the flush process, which was subsequently deleted (and as you can expect, caused the tests to crash).
The following command consistently failed, which was quite convenient to investigate the issue:
`$ while rm -rf /dev/shm/single_stress && ./db_stress --clear_column_family_one_in=0 --column_families=1 --db=/dev/shm/single_stress --experimental_mempurge_threshold=5.493146827397074 --flush_one_in=10000 --reopen=0 --write_buffer_size=262144 --value_size_mult=33 --max_write_buffer_number=3 -ops_per_thread=10000; do : ; done`

### Solution proposed
The memtables are no longer sorted based on their `memtableID` in the `PickMemtablesToFlush` function. Additionally, the `next_log_number` of the memtable created as an output of the `Mempurge` function now takes in the correct value (the log number of the first memtable being mempurged). Finally, the VersionEdit object of the flush class now takes the maximum `next_log_number` of the stack of memtables being flushed, which doesnt change anything when Mempurge is `off` but becomes necessary when Mempurge is `on`.

### Testing of the solution
The following command no longer fails:
``$ while rm -rf /dev/shm/single_stress && ./db_stress --clear_column_family_one_in=0 --column_families=1 --db=/dev/shm/single_stress --experimental_mempurge_threshold=5.493146827397074 --flush_one_in=10000 --reopen=0 --write_buffer_size=262144 --value_size_mult=33 --max_write_buffer_number=3 -ops_per_thread=10000; do : ; done``
Additionally, I ran `db_crashtest` (`whitebox` and `blackbox`) for 2.5 hours with MemPurge on and did not observe any crash.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9671

Reviewed By: pdillinger

Differential Revision: D34697424

Pulled By: bjlemaire

fbshipit-source-id: d1ab675b361904351ac81a35c184030e52222874
2022-03-10 15:16:55 -08:00
..
blob Add rate limiter priority to ReadOptions (#9424) 2022-02-16 23:18:14 -08:00
compaction compression_per_level should be used for flush and changeable (#9658) 2022-03-07 18:06:19 -08:00
db_impl Support user-defined timestamps in write-committed txns (#9629) 2022-03-08 16:20:59 -08:00
arena_wrapped_db_iter.cc Rename ImmutableOptions variables (#8409) 2021-06-16 16:51:38 -07:00
arena_wrapped_db_iter.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
builder.cc Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
builder.h Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
c_test.c Hide deprecated, inefficient block-based filter from public API (#9535) 2022-02-12 07:05:57 -08:00
c.cc Remove BlockBasedTableOptions.hash_index_allow_collision (#9454) 2022-03-01 13:58:02 -08:00
column_family_test.cc More refactoring ahead of footer & meta changes (#9240) 2021-12-10 08:13:26 -08:00
column_family.cc Fix bug affecting GetSortedWalFiles, Backups, Checkpoint (#9208) 2021-11-24 14:52:00 -08:00
column_family.h Add DB properties for BlobDB (#8734) 2021-09-08 12:22:04 -07:00
compact_files_test.cc Fix test race conditions with OnFlushCompleted() (#9617) 2022-02-22 12:23:00 -08:00
comparator_db_test.cc More refactoring ahead of footer & meta changes (#9240) 2021-12-10 08:13:26 -08:00
convenience.cc Add rate limiter priority to ReadOptions (#9424) 2022-02-16 23:18:14 -08:00
corruption_test.cc Make the Env class Customizable (#9293) 2022-01-04 16:45:49 -08:00
cuckoo_table_db_test.cc Experimental support for SST unique IDs (#8990) 2021-10-18 23:32:01 -07:00
db_basic_test.cc Fix some MultiGet batching stats (#9583) 2022-02-17 16:31:41 -08:00
db_block_cache_test.cc Enhance new cache key testing & comments (#9329) 2022-02-04 14:15:58 -08:00
db_bloom_filter_test.cc Dynamic toggling of BlockBasedTableOptions::detect_filter_construct_corruption (#9654) 2022-03-04 10:35:08 -08:00
db_compaction_filter_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_compaction_test.cc Unschedule manual compaction from thread-pool queue (#9625) 2022-03-02 13:43:00 -08:00
db_dynamic_level_test.cc Remove deprecated API AdvancedColumnFamilyOptions::soft_rate_limit/hard_rate_limit (#9452) 2022-01-27 13:01:09 -08:00
db_encryption_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_filesnapshot.cc Use a sorted vector instead of a map to store blob file metadata (#9526) 2022-02-09 12:36:43 -08:00
db_flush_test.cc Fix mempurge crash reported in #8958 (#9671) 2022-03-10 15:16:55 -08:00
db_info_dumper.cc Allow WAL dir to change with db dir (#8582) 2021-07-30 12:16:44 -07:00
db_info_dumper.h Add a DB Session ID (#6959) 2020-06-15 10:47:02 -07:00
db_inplace_update_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_io_failure_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_iter_stress_test.cc Make ImmutableOptions struct that inherits from ImmutableCFOptions and ImmutableDBOptions (#8262) 2021-05-05 14:00:17 -07:00
db_iter_test.cc Remove iter_start_seqnum and preserve_deletes (#9430) 2022-01-28 13:28:38 -08:00
db_iter.cc Remove iter_start_seqnum and preserve_deletes (#9430) 2022-01-28 13:28:38 -08:00
db_iter.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
db_iterator_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_kv_checksum_test.cc Revise APIs related to user-defined timestamp (#8946) 2022-02-01 22:19:01 -08:00
db_log_iter_test.cc Attempt to deflake DBTestXactLogIterator.TransactionLogIteratorCorruptedLog (#8627) 2021-08-10 11:10:07 -07:00
db_logical_block_size_cache_test.cc Attempt to deflake DBLogicalBlockSizeCacheTest.CreateColumnFamilies (#9516) 2022-03-04 11:35:28 -08:00
db_memtable_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_merge_operand_test.cc Fix PinSelf() read-after-free in DB::GetMergeOperands() (#9507) 2022-02-15 12:25:18 -08:00
db_merge_operator_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_options_test.cc Remove deprecated option new_table_reader_for_compaction_inputs (#9443) 2022-02-08 19:31:28 -08:00
db_properties_test.cc compression_per_level should be used for flush and changeable (#9658) 2022-03-07 18:06:19 -08:00
db_range_del_test.cc Incremental Space Amp Compactions in Universal Style (#8655) 2021-10-20 10:04:13 -07:00
db_rate_limiter_test.cc Rate-limit automatic WAL flush after each user write (#9607) 2022-03-08 13:19:39 -08:00
db_secondary_test.cc Make the Env class Customizable (#9293) 2022-01-04 16:45:49 -08:00
db_sst_test.cc Make the Env class Customizable (#9293) 2022-01-04 16:45:49 -08:00
db_statistics_test.cc Bytes read stat for VerifyChecksum() and VerifyFileChecksums() APIs (#8741) 2021-09-07 13:28:29 -07:00
db_table_properties_test.cc Fix backward compatibility with 2.5 through 2.7 (#9189) 2021-11-19 17:31:01 -08:00
db_tailing_iter_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_test2.cc Test refactoring for Backups+Temperatures (#9655) 2022-03-04 12:32:30 -08:00
db_test_util.cc Use a sorted vector instead of a map to store blob file metadata (#9526) 2022-02-09 12:36:43 -08:00
db_test_util.h Test refactoring for Backups+Temperatures (#9655) 2022-03-04 12:32:30 -08:00
db_test.cc Fix spelling in public API (#9490) 2022-02-03 15:15:23 -08:00
db_universal_compaction_test.cc Adhere to per-DB concurrency limit when bottom-pri compactions exist (#9179) 2021-11-18 17:31:50 -08:00
db_wal_test.cc Add record to set WAL compression type if enabled (#9556) 2022-02-17 16:19:31 -08:00
db_with_timestamp_basic_test.cc Use the comparator from the sst file table properties in sst_dump_tool (#9491) 2022-02-08 12:15:35 -08:00
db_with_timestamp_compaction_test.cc Use the comparator from the sst file table properties in sst_dump_tool (#9491) 2022-02-08 12:15:35 -08:00
db_write_buffer_manager_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_write_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
dbformat_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
dbformat.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
dbformat.h Remove timestamp from key in expected state (#9525) 2022-02-09 09:50:54 -08:00
deletefile_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
error_handler_fs_test.cc Fix race condition in error_handler_fs_test (#9325) 2021-12-20 23:16:52 -08:00
error_handler.cc Work around some new clang-analyze failures (#9515) 2022-02-07 18:24:36 -08:00
error_handler.h cleanup error_handler related code (#9098) 2021-11-08 15:49:17 -08:00
event_helpers.cc Add a listener callback for end of auto error recovery (#9244) 2021-12-08 14:30:57 -08:00
event_helpers.h Add a listener callback for end of auto error recovery (#9244) 2021-12-08 14:30:57 -08:00
experimental.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
external_sst_file_basic_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
external_sst_file_ingestion_job.cc Do not rely on ADL when invoking std::max_element (#9608) 2022-03-02 17:41:02 -08:00
external_sst_file_ingestion_job.h New stable, fixed-length cache keys (#9126) 2021-12-16 17:15:13 -08:00
external_sst_file_test.cc Make the Env class Customizable (#9293) 2022-01-04 16:45:49 -08:00
fault_injection_test.cc Fix a bug causing duplicate trailing entries in WritableFile (buffered IO) (#9236) 2021-12-13 09:00:36 -08:00
file_indexer_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filename_test.cc Remove unused includes (#7604) 2020-10-28 23:22:27 -07:00
flush_job_test.cc Use the comparator from the sst file table properties in sst_dump_tool (#9491) 2022-02-08 12:15:35 -08:00
flush_job.cc Fix mempurge crash reported in #8958 (#9671) 2022-03-10 15:16:55 -08:00
flush_job.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
flush_scheduler.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
flush_scheduler.h Include C++ standard library headers instead of C compatibility headers (#8068) 2021-03-19 12:09:47 -07:00
forward_iterator_bench.cc Remove using namespace (#9369) 2022-01-12 09:31:12 -08:00
forward_iterator.cc Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
forward_iterator.h Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
import_column_family_job.cc Add Temperature info in NewSequentialFile() (#9499) 2022-02-18 18:23:07 -08:00
import_column_family_job.h New stable, fixed-length cache keys (#9126) 2021-12-16 17:15:13 -08:00
import_column_family_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
internal_stats.cc Log blob file space amp and expose it via the rocksdb.blob-stats DB property (#9538) 2022-02-10 12:42:11 -08:00
internal_stats.h Support GetMapProperty() with "rocksdb.dbstats" (#9057) 2021-10-20 13:17:00 -07:00
job_context.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
kv_checksum.h fix compile errors in db/kv_checksum.h (#9173) 2021-11-16 10:20:50 -08:00
listener_test.cc Fix test race conditions with OnFlushCompleted() (#9617) 2022-02-22 12:23:00 -08:00
log_format.h Add record to set WAL compression type if enabled (#9556) 2022-02-17 16:19:31 -08:00
log_reader.cc Integrate WAL compression into log reader/writer. (#9642) 2022-03-09 15:49:53 -08:00
log_reader.h Integrate WAL compression into log reader/writer. (#9642) 2022-03-09 15:49:53 -08:00
log_test.cc Integrate WAL compression into log reader/writer. (#9642) 2022-03-09 15:49:53 -08:00
log_writer.cc Integrate WAL compression into log reader/writer. (#9642) 2022-03-09 15:49:53 -08:00
log_writer.h Integrate WAL compression into log reader/writer. (#9642) 2022-03-09 15:49:53 -08:00
logs_with_prep_tracker.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
logs_with_prep_tracker.h Include C++ standard library headers instead of C compatibility headers (#8068) 2021-03-19 12:09:47 -07:00
lookup_key.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
malloc_stats.cc Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
malloc_stats.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
manual_compaction_test.cc Remove using namespace (#9369) 2022-01-12 09:31:12 -08:00
memtable_list_test.cc MemTableList::TrimHistory now use allocated bytes (#9020) 2021-12-02 11:45:39 -08:00
memtable_list.cc Fix mempurge crash reported in #8958 (#9671) 2022-03-10 15:16:55 -08:00
memtable_list.h Fix mempurge crash reported in #8958 (#9671) 2022-03-10 15:16:55 -08:00
memtable.cc Fix major bug with MultiGet, DeleteRange, and memtable Bloom (#9453) 2022-01-27 14:55:04 -08:00
memtable.h Fix major bug with MultiGet, DeleteRange, and memtable Bloom (#9453) 2022-01-27 14:55:04 -08:00
merge_context.h Add Merge Operator support to WriteBatchWithIndex (#8135) 2021-05-10 12:50:25 -07:00
merge_helper_test.cc Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
merge_helper.cc Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
merge_helper.h Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
merge_operator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merge_test.cc Make the Env class Customizable (#9293) 2022-01-04 16:45:49 -08:00
obsolete_files_test.cc Add commit marker with timestamp (#9266) 2021-12-10 11:05:35 -08:00
options_file_test.cc No elide constructors (#7798) 2020-12-23 16:55:53 -08:00
output_validator.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
output_validator.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
perf_context_test.cc Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
periodic_work_scheduler_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
periodic_work_scheduler.cc Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
periodic_work_scheduler.h Add a SystemClock class to capture the time functions of an Env (#7858) 2021-01-25 22:09:11 -08:00
pinned_iterators_manager.h Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
plain_table_db_test.cc Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
pre_release_callback.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
prefix_test.cc Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
range_del_aggregator_bench.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
range_del_aggregator_test.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
range_del_aggregator.cc In ParseInternalKey(), include corrupt key info in Status (#7515) 2020-10-28 10:12:58 -07:00
range_del_aggregator.h Fix some typos in comments (#8066) 2021-03-25 21:18:08 -07:00
range_tombstone_fragmenter_test.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
range_tombstone_fragmenter.cc Added memtable garbage statistics (#8411) 2021-06-18 04:57:27 -07:00
range_tombstone_fragmenter.h Added memtable garbage statistics (#8411) 2021-06-18 04:57:27 -07:00
read_callback.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
repair_test.cc Some fixes and enhancements to ldb repair (#8544) 2021-07-28 16:44:14 -07:00
repair.cc Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
snapshot_checker.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
snapshot_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
snapshot_impl.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
table_cache.cc Add last level and non-last level read statistics (#9519) 2022-02-18 14:23:07 -08:00
table_cache.h Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
table_properties_collector_test.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
table_properties_collector.cc Apply sample_for_compression to all block-based tables (#8105) 2021-03-25 15:00:45 -07:00
table_properties_collector.h Track each SST's timestamp information as user properties (#9093) 2021-11-19 11:37:06 -08:00
transaction_log_impl.cc Add commit marker with timestamp (#9266) 2021-12-10 11:05:35 -08:00
transaction_log_impl.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
trim_history_scheduler.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
trim_history_scheduler.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
version_builder_test.cc Use a sorted vector instead of a map to store blob file metadata (#9526) 2022-02-09 12:36:43 -08:00
version_builder.cc Use a sorted vector instead of a map to store blob file metadata (#9526) 2022-02-09 12:36:43 -08:00
version_builder.h Fast path for detecting unchanged prefix_extractor (#9407) 2022-01-21 11:37:46 -08:00
version_edit_handler.cc Clean up VersionStorageInfo a bit (#9494) 2022-02-04 08:19:20 -08:00
version_edit_handler.h Fixed manifest_dump issues when printing keys and values containing null characters (#8378) 2021-06-10 12:55:20 -07:00
version_edit_test.cc File temperature information should be preserved when restart the DB (#9242) 2021-12-03 14:43:14 -08:00
version_edit.cc Print file checksum in hex (#9196) 2021-11-22 09:30:47 -08:00
version_edit.h Clean up VersionStorageInfo a bit (#9494) 2022-02-04 08:19:20 -08:00
version_set_test.cc Rework VersionStorageInfo::ComputeFilesMarkedForForcedBlobGC a bit (#9548) 2022-02-11 08:41:41 -08:00
version_set.cc Fix some MultiGet batching stats (#9583) 2022-02-17 16:31:41 -08:00
version_set.h Fix PinSelf() read-after-free in DB::GetMergeOperands() (#9507) 2022-02-15 12:25:18 -08:00
wal_edit_test.cc Always track WAL obsoletion (#7759) 2020-12-09 16:02:12 -08:00
wal_edit.cc Always track WAL obsoletion (#7759) 2020-12-09 16:02:12 -08:00
wal_edit.h Always track WAL obsoletion (#7759) 2020-12-09 16:02:12 -08:00
wal_manager_test.cc Make SystemClock into a Customizable Class (#8636) 2021-09-21 09:23:48 -07:00
wal_manager.cc Allow WAL dir to change with db dir (#8582) 2021-07-30 12:16:44 -07:00
wal_manager.h Allow WAL dir to change with db dir (#8582) 2021-07-30 12:16:44 -07:00
write_batch_base.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_batch_internal.h Support WBWI for keys having timestamps (#9603) 2022-02-22 14:23:01 -08:00
write_batch_test.cc Support WBWI for keys having timestamps (#9603) 2022-02-22 14:23:01 -08:00
write_batch.cc Support WBWI for keys having timestamps (#9603) 2022-02-22 14:23:01 -08:00
write_callback_test.cc Move slow valgrind tests behind -DROCKSDB_FULL_VALGRIND_RUN (#8475) 2021-07-07 11:14:05 -07:00
write_callback.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_controller_test.cc Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_controller.cc Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_controller.h Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_thread.cc Rate-limit automatic WAL flush after each user write (#9607) 2022-03-08 13:19:39 -08:00
write_thread.h Rate-limit automatic WAL flush after each user write (#9607) 2022-03-08 13:19:39 -08:00