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anand76 35cdd3e71e MultiGet async IO across multiple levels (#10535) 
Summary:
This PR exploits parallelism in MultiGet across levels. It applies only to the coroutine version of MultiGet. Previously, MultiGet file reads from SST files in the same level were parallelized. With this PR, MultiGet batches with keys distributed across multiple levels are read in parallel. This is accomplished by splitting the keys not present in a level (determined by bloom filtering) into a separate batch, and processing the new batch in parallel with the original batch.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10535

Test Plan:
1. Ensure existing MultiGet unit tests pass, updating them as necessary
2. New unit tests - TODO
3. Run stress test - TODO

No noticeable regression (<1%) without async IO -
Without PR: `multireadrandom :       7.261 micros/op 1101724 ops/sec 60.007 seconds 66110936 operations;  571.6 MB/s (8168992 of 8168992 found)`
With PR: `multireadrandom :       7.305 micros/op 1095167 ops/sec 60.007 seconds 65717936 operations;  568.2 MB/s (8271992 of 8271992 found)`

For a fully cached DB, but with async IO option on, no regression observed (<1%) -
Without PR: `multireadrandom :       5.201 micros/op 1538027 ops/sec 60.005 seconds 92288936 operations;  797.9 MB/s (11540992 of 11540992 found) `
With PR: `multireadrandom :       5.249 micros/op 1524097 ops/sec 60.005 seconds 91452936 operations;  790.7 MB/s (11649992 of 11649992 found) `

Reviewed By: akankshamahajan15

Differential Revision: D38774009

Pulled By: anand1976

fbshipit-source-id: c955e259749f1c091590ade73105b3ee46cd0007
2022-08-19 16:52:52 -07:00
..
blob Add a blob-specific cache priority (#10461) 2022-08-12 17:59:06 -07:00
compaction Add memtable per key-value checksum (#10281) 2022-08-12 13:51:32 -07:00
db_impl Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
wide Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
arena_wrapped_db_iter.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -07:00
arena_wrapped_db_iter.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
builder.cc Support prepopulating/warming the blob cache (#10298) 2022-07-17 07:13:59 -07:00
builder.h Add seqno to time mapping (#10338) 2022-07-14 21:49:34 -07:00
c.cc Support prepopulating/warming the blob cache (#10298) 2022-07-17 07:13:59 -07:00
c_test.c Support prepopulating/warming the blob cache (#10298) 2022-07-17 07:13:59 -07:00
column_family.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -07:00
column_family.h Add seqno to time mapping (#10338) 2022-07-14 21:49:34 -07:00
column_family_test.cc Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
compact_files_test.cc Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
comparator_db_test.cc Document design/specification bugs with auto_prefix_mode (#10144) 2022-06-13 11:08:50 -07:00
convenience.cc Specify largest_seqno in VerifyChecksum (#9919) 2022-05-02 10:22:08 -07:00
corruption_test.cc Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
cuckoo_table_db_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_basic_test.cc MultiGet async IO across multiple levels (#10535) 2022-08-19 16:52:52 -07:00
db_block_cache_test.cc Add a blob-specific cache priority (#10461) 2022-08-12 17:59:06 -07:00
db_bloom_filter_test.cc Update/clarify required properties for prefix extractors (#10245) 2022-06-28 16:08:30 -07:00
db_compaction_filter_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_compaction_test.cc Allow manual compactions to run in parallel by default (#10317) 2022-07-28 17:07:36 -07:00
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 Reduce risk of backup or checkpoint missing a WAL file (#10083) 2022-06-01 11:02:27 -07:00
db_flush_test.cc Dynamically changeable MemPurge option (#10011) 2022-06-23 09:42:18 -07:00
db_info_dumper.cc Printing IO Error in DumpDBFileSummary (#9940) 2022-05-04 10:19:53 -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 in-place updates for value types other than kTypeValue (#10254) 2022-06-27 16:37:09 -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.cc Reset blob value as soon as it's not needed in DBIter (#10490) 2022-08-09 11:39:57 -07:00
db_iter.h Reset blob value as soon as it's not needed in DBIter (#10490) 2022-08-09 11:39:57 -07:00
db_iter_stress_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_iter_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_iterator_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_kv_checksum_test.cc Add memtable per key-value checksum (#10281) 2022-08-12 13:51:32 -07:00
db_log_iter_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -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 Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
db_merge_operand_test.cc Avoid allocations/copies for large GetMergeOperands() results (#10458) 2022-08-04 00:42:13 -07:00
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 Fix typo in comments and code (#10233) 2022-06-22 15:45:21 -07:00
db_properties_test.cc Add blob cache tickers, perf context statistics, and DB properties (#10203) 2022-06-28 13:52:35 -07:00
db_range_del_test.cc Try to trivial move more than one files (#10190) 2022-07-05 10:10:37 -07:00
db_rate_limiter_test.cc Add rate-limiting support to batched MultiGet() (#10159) 2022-06-17 16:40:47 -07:00
db_readonly_with_timestamp_test.cc Add timestamp support to CompactedDBImpl (#10030) 2022-05-24 12:14:10 -07:00
db_secondary_test.cc Fail DB::Open() if logger cannot be created (#9984) 2022-05-27 07:23:31 -07:00
db_sst_test.cc Pass the size of blob files to SstFileManager during DB open (#10062) 2022-05-27 05:58:43 -07:00
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 Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_tailing_iter_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_test.cc Re-enable SuggestCompactRangeTest and add Universal Compaction test (#10473) 2022-08-05 13:16:58 -07:00
db_test2.cc Add a blob-specific cache priority (#10461) 2022-08-12 17:59:06 -07:00
db_test_util.cc Tiered compaction: integrate Seqno time mapping with per key placement (#10370) 2022-07-15 19:01:30 -07:00
db_test_util.h Tiered compaction: integrate Seqno time mapping with per key placement (#10370) 2022-07-15 19:01:30 -07:00
db_universal_compaction_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
db_wal_test.cc Deflake DBWALTest.RaceInstallFlushResultsWithWalObsoletion (#10456) 2022-08-04 12:14:28 -07:00
db_with_timestamp_basic_test.cc Fix assertion error with read_opts.iter_start_ts (#10279) 2022-06-30 10:16:03 -07:00
db_with_timestamp_compaction_test.cc Provide support for subcompactions with user-defined timestamps (#10344) 2022-07-31 11:39:16 -07:00
db_with_timestamp_test_util.cc Add timestamp support to DBImplReadOnly (#10004) 2022-05-19 18:39:41 -07:00
db_with_timestamp_test_util.h Add timestamp support to DBImplReadOnly (#10004) 2022-05-19 18:39:41 -07:00
db_write_buffer_manager_test.cc Prevent a case of WriteBufferManager flush thrashing (#6364) 2022-08-17 15:53:40 -07:00
db_write_test.cc Fix race in ExitAsBatchGroupLeader with pipelined writes (#9944) 2022-08-02 14:52:10 -07:00
dbformat.cc Make InternalKeyComparator not configurable (#10342) 2022-07-14 10:09:31 -07:00
dbformat.h Add helper function to get debug type name (#10243) 2022-07-15 14:42:00 -07:00
dbformat_test.cc Make InternalKeyComparator not configurable (#10342) 2022-07-14 10:09:31 -07:00
deletefile_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
error_handler.cc Do not hold mutex when write keys if not necessary (#7516) 2022-07-21 13:35:36 -07:00
error_handler.h Do not hold mutex when write keys if not necessary (#7516) 2022-07-21 13:35:36 -07:00
error_handler_fs_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
event_helpers.cc LOG more info on oldest snapshot and sequence numbers (#10454) 2022-08-12 13:08:50 -07:00
event_helpers.h Add a listener callback for end of auto error recovery (#9244) 2021-12-08 14:30:57 -08:00
experimental.cc Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
external_sst_file_basic_test.cc Tiered compaction: integrate Seqno time mapping with per key placement (#10370) 2022-07-15 19:01:30 -07:00
external_sst_file_ingestion_job.cc Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
external_sst_file_ingestion_job.h Track SST unique id in MANIFEST and verify (#9990) 2022-05-19 11:04:21 -07:00
external_sst_file_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
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.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_indexer.h Use std::numeric_limits<> (#9954) 2022-05-05 13:08:21 -07:00
file_indexer_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filename_test.cc fixing issue #8345 RocksDB does not work when using UNC network paths (#9384) 2022-03-30 15:55:31 -07:00
flush_job.cc Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
flush_job.h Add seqno to time mapping (#10338) 2022-07-14 21:49:34 -07:00
flush_job_test.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -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.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -07:00
forward_iterator.h Make InternalKeyComparator not configurable (#10342) 2022-07-14 10:09:31 -07:00
forward_iterator_bench.cc Remove using namespace (#9369) 2022-01-12 09:31:12 -08:00
history_trimming_iterator.h Add OpenAndTrimHistory API to support trimming data with specified timestamp (#9410) 2022-03-11 16:13:23 -08:00
import_column_family_job.cc Add some missing headers (#10519) 2022-08-11 12:45:50 -07:00
import_column_family_job.h Add some missing headers (#10519) 2022-08-11 12:45:50 -07:00
import_column_family_test.cc Add some missing headers (#10519) 2022-08-11 12:45:50 -07:00
internal_stats.cc Add blob cache tickers, perf context statistics, and DB properties (#10203) 2022-06-28 13:52:35 -07:00
internal_stats.h Tiered Compaction: per key placement support (#9964) 2022-07-13 20:54:49 -07:00
job_context.h CompactionIterator sees consistent view of which keys are committed (#9830) 2022-04-14 11:11:04 -07:00
kv_checksum.h Add memtable per key-value checksum (#10281) 2022-08-12 13:51:32 -07:00
listener_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
log_format.h Add record to set WAL compression type if enabled (#9556) 2022-02-17 16:19:31 -08:00
log_reader.cc Add checksum handshake for WAL fragment decompression (#10339) 2022-07-25 16:27:26 -07:00
log_reader.h Add checksum handshake for WAL fragment decompression (#10339) 2022-07-25 16:27:26 -07:00
log_test.cc Add checksum handshake for WAL fragment decompression (#10339) 2022-07-25 16:27:26 -07:00
log_writer.cc WritableFileWriter tries to skip operations after failure (#10489) 2022-08-10 10:19:20 -07:00
log_writer.h Fix typo in comments and code (#10233) 2022-06-22 15:45:21 -07:00
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 Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
memtable.cc Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
memtable.h Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
memtable_list.cc Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
memtable_list.h Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
memtable_list_test.cc Add support for wide-column point lookups (#10540) 2022-08-19 11:51:12 -07:00
merge_context.h Add Merge Operator support to WriteBatchWithIndex (#8135) 2021-05-10 12:50:25 -07:00
merge_helper.cc Add API for writing wide-column entities (#10242) 2022-06-25 15:30:47 -07:00
merge_helper.h Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
merge_helper_test.cc 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 Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
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 Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
periodic_work_scheduler.cc Fix seqno->time worker not scheduled with multi DB instances (#10383) 2022-07-18 19:08:39 -07:00
periodic_work_scheduler.h Fix seqno->time worker not scheduled with multi DB instances (#10383) 2022-07-18 19:08:39 -07:00
periodic_work_scheduler_test.cc Add seqno to time mapping (#10338) 2022-07-14 21:49:34 -07:00
pinned_iterators_manager.h Avoid allocations/copies for large GetMergeOperands() results (#10458) 2022-08-04 00:42:13 -07:00
plain_table_db_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
post_memtable_callback.h Snapshots with user-specified timestamps (#9879) 2022-06-10 16:07:03 -07:00
pre_release_callback.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
prefix_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -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_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_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
range_tombstone_fragmenter_test.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
read_callback.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
repair.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -07:00
repair_test.cc Remove customized naming from InternalKeyComparator (#10343) 2022-07-12 13:30:35 -07:00
seqno_time_test.cc Change bottommost_temperture to last_level_temperture (#10471) 2022-08-08 14:36:34 -07:00
seqno_to_time_mapping.cc Tiered compaction: integrate Seqno time mapping with per key placement (#10370) 2022-07-15 19:01:30 -07:00
seqno_to_time_mapping.h Tiered compaction: integrate Seqno time mapping with per key placement (#10370) 2022-07-15 19:01:30 -07:00
snapshot_checker.h Use STATIC_AVOID_DESTRUCTION for static objects with non-trivial destructors (#9958) 2022-05-17 09:39:22 -07:00
snapshot_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
snapshot_impl.h Snapshots with user-specified timestamps (#9879) 2022-06-10 16:07:03 -07:00
table_cache.cc Fix range deletion handling in async MultiGet (#10534) 2022-08-17 13:51:39 -07:00
table_cache.h Fix range deletion handling in async MultiGet (#10534) 2022-08-17 13:51:39 -07:00
table_cache_sync_and_async.h Fix range deletion handling in async MultiGet (#10534) 2022-08-17 13:51:39 -07:00
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
table_properties_collector_test.cc WritableFileWriter tries to skip operations after failure (#10489) 2022-08-10 10:19:20 -07:00
transaction_log_impl.cc Support read rate-limiting in SequentialFileReader (#9973) 2022-05-24 10:28:57 -07:00
transaction_log_impl.h Add checks to GetUpdatesSince (#9459) 2022-04-14 17:12:16 -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.cc Add basic kRoundRobin compaction policy (#10107) 2022-06-21 11:56:53 -07:00
version_builder.h Account memory of FileMetaData in global memory limit (#9924) 2022-06-14 13:06:40 -07:00
version_builder_test.cc Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
version_edit.cc Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
version_edit.h Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
version_edit_handler.cc Add blob source to retrieve blobs in RocksDB (#10198) 2022-06-20 20:58:11 -07:00
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 Remove unused fields from FileMetaData (temporarily) (#10443) 2022-08-01 17:56:13 -07:00
version_set.cc MultiGet async IO across multiple levels (#10535) 2022-08-19 16:52:52 -07:00
version_set.h MultiGet async IO across multiple levels (#10535) 2022-08-19 16:52:52 -07:00
version_set_sync_and_async.h Fix range deletion handling in async MultiGet (#10534) 2022-08-17 13:51:39 -07:00
version_set_test.cc WritableFileWriter tries to skip operations after failure (#10489) 2022-08-10 10:19:20 -07:00
version_util.h Add blob source to retrieve blobs in RocksDB (#10198) 2022-06-20 20:58:11 -07:00
wal_edit.cc Do not hold mutex when write keys if not necessary (#7516) 2022-07-21 13:35:36 -07:00
wal_edit.h Do not hold mutex when write keys if not necessary (#7516) 2022-07-21 13:35:36 -07:00
wal_edit_test.cc Do not hold mutex when write keys if not necessary (#7516) 2022-07-21 13:35:36 -07:00
wal_manager.cc Fix bug for WalManager with compressed WAL (#10130) 2022-06-08 14:16:43 -07:00
wal_manager.h Fix bug for WalManager with compressed WAL (#10130) 2022-06-08 14:16:43 -07:00
wal_manager_test.cc Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
write_batch.cc Handoff checksum during WAL replay (#10212) 2022-07-05 15:44:35 -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 Handoff checksum during WAL replay (#10212) 2022-07-05 15:44:35 -07:00
write_batch_test.cc Fragment memtable range tombstone in the write path (#10380) 2022-08-05 12:02:33 -07:00
write_callback.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
write_callback_test.cc Migrate to docker for CI run (#10496) 2022-08-10 17:34:38 -07:00
write_controller.cc Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_controller.h Set Write rate limiter priority dynamically and pass it to FS (#9988) 2022-05-18 00:41:41 -07:00
write_controller_test.cc Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_thread.cc Fix race in ExitAsBatchGroupLeader with pipelined writes (#9944) 2022-08-02 14:52:10 -07:00
write_thread.h Fix race in ExitAsBatchGroupLeader with pipelined writes (#9944) 2022-08-02 14:52:10 -07:00