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Akanksha Mahajan 17ce1ca48b Reuse internal auto readhead_size at each Level (expect L0) for Iterations (#9056) 
Summary:
RocksDB does auto-readahead for iterators on noticing more than two sequential reads for a table file if user doesn't provide readahead_size. The readahead starts at 8KB and doubles on every additional read up to max_auto_readahead_size. However at each level, if iterator moves over next file, readahead_size starts again from 8KB.

This PR introduces a new ReadOption "adaptive_readahead" which when set true will maintain readahead_size  at each level. So when iterator moves from one file to another, new file's readahead_size will continue from previous file's readahead_size instead of scratch. However if reads are not sequential it will fall back to 8KB (default) with no prefetching for that block.

1. If block is found in cache but it was eligible for prefetch (block wasn't in Rocksdb's prefetch buffer),  readahead_size will decrease by 8KB.
2. It maintains readahead_size for L1 - Ln levels.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9056

Test Plan:
Added new unit tests
Ran db_bench for "readseq, seekrandom, seekrandomwhilewriting, readrandom" with --adaptive_readahead=true and there was no regression if new feature is enabled.

Reviewed By: anand1976

Differential Revision: D31773640

Pulled By: akankshamahajan15

fbshipit-source-id: 7332d16258b846ae5cea773009195a5af58f8f98
 		2021-11-10 16:20:04 -08:00
..
blob Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
compaction Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
db_impl Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -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 Don't call OnTableFileCreated with OK for empty+deleted file (#9118) 2021-11-03 08:43:27 -07:00
builder.h Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
c.cc Make it possible to force the garbage collection of the oldest blob files (#8994) 2021-10-11 18:03:01 -07:00
c_test.c Make it possible to force the garbage collection of the oldest blob files (#8994) 2021-10-11 18:03:01 -07:00
column_family.cc Make it possible to force the garbage collection of the oldest blob files (#8994) 2021-10-11 18:03:01 -07:00
column_family.h Add DB properties for BlobDB (#8734) 2021-09-08 12:22:04 -07:00
column_family_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
compact_files_test.cc Compaction should not move data to up level (#8116) 2021-03-29 17:10:42 -07:00
comparator_db_test.cc
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convenience.cc Make ImmutableOptions struct that inherits from ImmutableCFOptions and ImmutableDBOptions (#8262) 2021-05-05 14:00:17 -07:00
corruption_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -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 Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_block_cache_test.cc Fix PrepopulateBlockCache::kFlushOnly (#8750) 2021-09-15 15:33:20 -07:00
db_bloom_filter_test.cc Make SliceTransform into a Customizable class (#8641) 2021-09-27 07:43:47 -07:00
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 Try to start TTL earlier with kMinOverlappingRatio is used (#8749) 2021-11-01 14:36:31 -07:00
db_dynamic_level_test.cc Make SystemClock into a Customizable Class (#8636) 2021-09-21 09:23:48 -07:00
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 Add (Live)FileStorageInfo API (#8968) 2021-10-16 10:04:32 -07:00
db_flush_test.cc Fix TSAN report on MemPurge test (#9115) 2021-11-02 21:54:29 -07:00
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
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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.cc Rename ImmutableOptions variables (#8409) 2021-06-16 16:51:38 -07:00
db_iter.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
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 some unneeded code (#8736) 2021-09-01 14:28:58 -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 Allow WriteBatch to have keys with different timestamp sizes (#8725) 2021-09-12 15:34:26 -07:00
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
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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 a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -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 a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_properties_test.cc Add support for building on s390x platform (#8962) 2021-10-22 10:13:15 -07:00
db_range_del_test.cc Incremental Space Amp Compactions in Universal Style (#8655) 2021-10-20 10:04:13 -07:00
db_secondary_test.cc Skip directory fsync for filesystem btrfs (#8903) 2021-11-03 12:21:27 -07:00
db_sst_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -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 Experimental support for SST unique IDs (#8990) 2021-10-18 23:32:01 -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 Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_test2.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_test_util.cc Implement XXH3 block checksum type (#9069) 2021-10-28 22:15:17 -07:00
db_test_util.h Implement XXH3 block checksum type (#9069) 2021-10-28 22:15:17 -07:00
db_universal_compaction_test.cc Make SystemClock into a Customizable Class (#8636) 2021-09-21 09:23:48 -07:00
db_wal_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
db_with_timestamp_basic_test.cc Fix a bug in timestamp-related GC (#9116) 2021-11-09 13:08:55 -08:00
db_with_timestamp_compaction_test.cc Make MemTableRepFactory into a Customizable class (#8419) 2021-09-08 07:46:44 -07:00
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.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
dbformat.h Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
dbformat_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -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.cc cleanup error_handler related code (#9098) 2021-11-08 15:49:17 -08:00
error_handler.h cleanup error_handler related code (#9098) 2021-11-08 15:49:17 -08:00
error_handler_fs_test.cc cleanup error_handler related code (#9098) 2021-11-08 15:49:17 -08:00
event_helpers.cc Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
event_helpers.h Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
experimental.cc
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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 Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
external_sst_file_ingestion_job.h Fix sequence number bump logic in multi-CF SST ingestion (#9005) 2021-10-12 20:39:52 -07:00
external_sst_file_test.cc Implement XXH3 block checksum type (#9069) 2021-10-28 22:15:17 -07:00
fault_injection_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
file_indexer.cc
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file_indexer.h
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file_indexer_test.cc
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filename_test.cc
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flush_job.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
flush_job.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
flush_job_test.cc Fix NotifyOnFlushCompleted() for atomic flush (#8585) 2021-08-03 13:31:10 -07:00
flush_scheduler.cc
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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 Fix some typos in comments (#8066) 2021-03-25 21:18:08 -07:00
forward_iterator.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
forward_iterator_bench.cc
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import_column_family_job.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
import_column_family_job.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
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 InternalStats::DumpCFMapStat: fix sum.w_amp (#9065) 2021-10-31 23:11:43 -07:00
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 some lint warnings reported on 6.25 (#8945) 2021-09-27 11:43:20 -07:00
listener_test.cc Don't call OnTableFileCreated with OK for empty+deleted file (#9118) 2021-11-03 08:43:27 -07:00
log_format.h
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log_reader.cc
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log_reader.h
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log_test.cc Make StringEnv, StringSink, StringSource use FS classes (#7786) 2021-01-04 16:01:01 -08:00
log_writer.cc Using existing crc32c checksum in checksum handoff for Manifest and WAL (#8412) 2021-06-25 00:47:17 -07:00
log_writer.h Include C++ standard library headers instead of C compatibility headers (#8068) 2021-03-19 12:09:47 -07:00
logs_with_prep_tracker.cc
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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
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manual_compaction_test.cc
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memtable.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
memtable.h Adapt key-value checksum for timestamp-suffixed keys (#8914) 2021-09-14 13:14:39 -07:00
memtable_list.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
memtable_list.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
memtable_list_test.cc Fix NotifyOnFlushCompleted() for atomic flush (#8585) 2021-08-03 13:31:10 -07:00
merge_context.h Add Merge Operator support to WriteBatchWithIndex (#8135) 2021-05-10 12:50:25 -07:00
merge_helper.cc Add support for Merge with base value during Compaction in IntegratedBlobDB (#8445) 2021-06-24 18:11:30 -07:00
merge_helper.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
merge_helper_test.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
merge_operator.cc
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merge_test.cc Built-in support for generating unique IDs, bug fix (#8708) 2021-08-30 15:20:41 -07:00
obsolete_files_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -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.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
periodic_work_scheduler_test.cc Fix a minor issue with initializing the test path (#8555) 2021-07-23 08:38:45 -07:00
pinned_iterators_manager.h Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
plain_table_db_test.cc Remove some unneeded code (#8736) 2021-09-01 14:28:58 -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 Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
range_del_aggregator.cc
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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 Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
repair_test.cc Some fixes and enhancements to `ldb repair` (#8544) 2021-07-28 16:44:14 -07:00
snapshot_checker.h
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snapshot_impl.cc
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snapshot_impl.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
table_cache.cc Add file temperature related counter and bytes stats to and io_stats (#8710) 2021-10-07 14:58:41 -07:00
table_cache.h Add file temperature related counter and bytes stats to and io_stats (#8710) 2021-10-07 14:58:41 -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 Support "level_at_creation" in TablePropertiesCollectorFactory::Context (#8919) 2021-09-28 12:35:24 -07:00
table_properties_collector_test.cc Support "level_at_creation" in TablePropertiesCollectorFactory::Context (#8919) 2021-09-28 12:35:24 -07:00
transaction_log_impl.cc Add file operation callbacks to SequentialFileReader (#8982) 2021-10-05 10:51:59 -07:00
transaction_log_impl.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
trim_history_scheduler.cc
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trim_history_scheduler.h
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version_builder.cc Refactor and unify blob file saving and the logic that finds the oldest live blob file (#9122) 2021-11-05 16:50:52 -07:00
version_builder.h Refactor the detailed consistency checks and the SST saving logic in VersionBuilder (#9099) 2021-11-03 11:52:47 -07:00
version_builder_test.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
version_edit.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
version_edit.h Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
version_edit_handler.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -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 Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
version_set.cc Reuse internal auto readhead_size at each Level (expect L0) for Iterations (#9056) 2021-11-10 16:20:04 -08:00
version_set.h Refactor the detailed consistency checks and the SST saving logic in VersionBuilder (#9099) 2021-11-03 11:52:47 -07:00
version_set_test.cc Track per-SST user-defined timestamp information in MANIFEST (#9092) 2021-11-10 10:49:04 -08:00
wal_edit.cc
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wal_edit.h
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wal_edit_test.cc
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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
wal_manager_test.cc Make SystemClock into a Customizable Class (#8636) 2021-09-21 09:23:48 -07:00
write_batch.cc Adapt key-value checksum for timestamp-suffixed keys (#8914) 2021-09-14 13:14:39 -07:00
write_batch_base.cc
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write_batch_internal.h Adapt key-value checksum for timestamp-suffixed keys (#8914) 2021-09-14 13:14:39 -07:00
write_batch_test.cc Remove some unneeded code (#8736) 2021-09-01 14:28:58 -07:00
write_callback.h
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write_callback_test.cc Move slow valgrind tests behind -DROCKSDB_FULL_VALGRIND_RUN (#8475) 2021-07-07 11:14:05 -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_controller_test.cc Revamp WriteController (#8064) 2021-03-18 09:47:31 -07:00
write_thread.cc Stall writes in WriteBufferManager when memory_usage exceeds buffer_size (#7898) 2021-04-21 13:54:02 -07:00
write_thread.h typo: fix typo in db/write_thread's state (#8423) 2021-06-18 17:14:51 -07:00