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04b2c16f9b
rocksdb/table/block_based
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Akanksha Mahajan 04b2c16f9b Fix bug in rocksdb internal automatic prefetching (#9234) 
Summary:
After introducing adaptive_readahead, the original flow got
broken. Readahead size was set to 0 because of which rocksdb wasn't be
able to do automatic prefetching which it enables after seeing
sequential reads. This PR fixes it.

----------------------------------------------------------------------------------------------------

Before this patch:
b_bench -use_existing_db=true -db=/tmp/prefix_scan -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680 -duration=120 -ops_between_duration_checks=1
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
RocksDB:    version 6.27
Date:       Tue Nov 30 11:56:50 2021
CPU:        24 * Intel Core Processor (Broadwell)
CPUCache:   16384 KB
Keys:       32 bytes each (+ 0 bytes user-defined timestamp)
Values:     512 bytes each (256 bytes after compression)
Entries:    5000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    2594.0 MB (estimated)
FileSize:   1373.3 MB (estimated)
Write rate: 0 bytes/second
Read rate: 0 ops/second
Compression: Snappy
Compression sampling rate: 0
Memtablerep: SkipListFactory
Perf Level: 1
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
DB path: [/tmp/prefix_scan]

seekrandom   : 5356367.174 micros/op 0 ops/sec;   29.4 MB/s (23 of 23 found)

----------------------------------------------------------------------------------------------------

After the patch:
./db_bench -use_existing_db=true -db=/tmp/prefix_scan -benchmarks="seekrandom" -key_size=32 -value_size=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680 -duration=120 -ops_between_duration_checks=1
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
RocksDB:    version 6.27
Date:       Tue Nov 30 14:38:33 2021
CPU:        24 * Intel Core Processor (Broadwell)
CPUCache:   16384 KB
Keys:       32 bytes each (+ 0 bytes user-defined timestamp)
Values:     512 bytes each (256 bytes after compression)
Entries:    5000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    2594.0 MB (estimated)
FileSize:   1373.3 MB (estimated)
Write rate: 0 bytes/second
Read rate: 0 ops/second
Compression: Snappy
Compression sampling rate: 0
Memtablerep: SkipListFactory
Perf Level: 1
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
DB path: [/tmp/prefix_scan]
seekrandom   :  456504.277 micros/op 2 ops/sec;  359.8 MB/s (264 of 264 found)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9234

Test Plan:
Ran ./db_bench -db=/data/mysql/rocksdb/prefix_scan
-benchmarks="fillseq" -key_size=32 -value_size=512 -num=5000000 -use_d
irect_io_for_flush_and_compaction=true -target_file_size_base=16777216
and then ./db_bench -use_existing_db=true
-db=/data/mysql/rocksdb/prefix_scan -benchmarks="seekrandom"
-key_size=32 -value_siz
e=512 -num=5000000 -use_direct_reads=true -seek_nexts=327680
-duration=120 -ops_between_duration_checks=1
 and compared the results.

Reviewed By: anand1976

Differential Revision: D32743965

Pulled By: akankshamahajan15

fbshipit-source-id: b950fba68c91963b7deb5c20acdf471bc60251f5
2021-11-30 22:53:10 -08:00
..
binary_search_index_reader.cc Separate internal and user key comparators in BlockIter (#6944) 2020-07-07 17:26:16 -07:00
binary_search_index_reader.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
block_based_filter_block_test.cc Add table properties for number of entries added to filters (#8323) 2021-05-21 17:11:32 -07:00
block_based_filter_block.cc Deallocate payload of BlockBasedTableBuilder::Rep::FilterBlockBuilder earlier for Full/PartitionedFilter (#9070) 2021-11-04 13:35:38 -07:00
block_based_filter_block.h Deallocate payload of BlockBasedTableBuilder::Rep::FilterBlockBuilder earlier for Full/PartitionedFilter (#9070) 2021-11-04 13:35:38 -07:00
block_based_table_builder.cc Fix backward compatibility with 2.5 through 2.7 (#9189) 2021-11-19 17:31:01 -08:00
block_based_table_builder.h Some checksum code refactoring (#9113) 2021-11-04 09:09:34 -07:00
block_based_table_factory.cc Account Bloom/Ribbon filter construction memory in global memory limit (#9073) 2021-11-18 09:42:20 -08:00
block_based_table_factory.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
block_based_table_iterator.cc Reuse internal auto readhead_size at each Level (expect L0) for Iterations (#9056) 2021-11-10 16:20:04 -08:00
block_based_table_iterator.h Fix bug in rocksdb internal automatic prefetching (#9234) 2021-11-30 22:53:10 -08:00
block_based_table_reader_impl.h Parallelize secondary cache lookup in MultiGet (#8405) 2021-06-18 09:35:59 -07:00
block_based_table_reader_test.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
block_based_table_reader.cc Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
block_based_table_reader.h Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
block_builder.cc Improve data block construction performance (#9040) 2021-10-19 12:36:21 -07:00
block_builder.h Improve data block construction performance (#9040) 2021-10-19 12:36:21 -07:00
block_like_traits.h fix lru caching test and fix reference binding to null pointer (#8326) 2021-05-24 08:37:00 -07:00
block_prefetcher.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
block_prefetcher.h Fix bug in rocksdb internal automatic prefetching (#9234) 2021-11-30 22:53:10 -08:00
block_prefix_index.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
block_prefix_index.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
block_test.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
block_type.h Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
block.cc Support timestamps in SstFileWriter (#8899) 2021-09-09 18:58:01 -07:00
block.h Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
cachable_entry.h Parallelize secondary cache lookup in MultiGet (#8405) 2021-06-18 09:35:59 -07:00
data_block_footer.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
data_block_footer.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
data_block_hash_index_test.cc Make it possible to apply only a subrange of table property collectors (#8298) 2021-05-17 18:28:39 -07:00
data_block_hash_index.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
data_block_hash_index.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filter_block_reader_common.cc Parallelize secondary cache lookup in MultiGet (#8405) 2021-06-18 09:35:59 -07:00
filter_block_reader_common.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filter_block.h Account Bloom/Ribbon filter construction memory in global memory limit (#9073) 2021-11-18 09:42:20 -08:00
filter_policy_internal.h Add Bloom/Ribbon hybrid API support (#8679) 2021-08-20 18:00:16 -07:00
filter_policy.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
flush_block_policy.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
flush_block_policy.h Make FlushBlockPolicyFactory into a Customizable class (#8432) 2021-07-12 09:04:59 -07:00
full_filter_block_test.cc Add table properties for number of entries added to filters (#8323) 2021-05-21 17:11:32 -07:00
full_filter_block.cc Deallocate payload of BlockBasedTableBuilder::Rep::FilterBlockBuilder earlier for Full/PartitionedFilter (#9070) 2021-11-04 13:35:38 -07:00
full_filter_block.h Account Bloom/Ribbon filter construction memory in global memory limit (#9073) 2021-11-18 09:42:20 -08:00
hash_index_reader.cc Make ImmutableOptions struct that inherits from ImmutableCFOptions and ImmutableDBOptions (#8262) 2021-05-05 14:00:17 -07:00
hash_index_reader.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00
index_builder.cc Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
index_builder.h Make db_basic_test pass assert status checked (#7452) 2020-09-29 09:49:04 -07:00
index_reader_common.cc Parallelize secondary cache lookup in MultiGet (#8405) 2021-06-18 09:35:59 -07:00
index_reader_common.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
mock_block_based_table.h Make ImmutableOptions struct that inherits from ImmutableCFOptions and ImmutableDBOptions (#8262) 2021-05-05 14:00:17 -07:00
parsed_full_filter_block.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
parsed_full_filter_block.h Use new Insert and Lookup APIs in table reader to support secondary cache (#8315) 2021-05-21 18:29:12 -07:00
partitioned_filter_block_test.cc Deallocate payload of BlockBasedTableBuilder::Rep::FilterBlockBuilder earlier for Full/PartitionedFilter (#9070) 2021-11-04 13:35:38 -07:00
partitioned_filter_block.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
partitioned_filter_block.h Deallocate payload of BlockBasedTableBuilder::Rep::FilterBlockBuilder earlier for Full/PartitionedFilter (#9070) 2021-11-04 13:35:38 -07:00
partitioned_index_iterator.cc Reuse internal auto readhead_size at each Level (expect L0) for Iterations (#9056) 2021-11-10 16:20:04 -08:00
partitioned_index_iterator.h Fix bug in rocksdb internal automatic prefetching (#9234) 2021-11-30 22:53:10 -08:00
partitioned_index_reader.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
partitioned_index_reader.h Clarify caching behavior for index and filter partitions (#9068) 2021-10-27 17:23:04 -07:00
reader_common.cc Improve / clean up meta block code & integrity (#9163) 2021-11-18 11:43:44 -08:00
reader_common.h Bring the Configurable options together (#5753) 2020-09-14 17:01:01 -07:00
uncompression_dict_reader.cc Cleanup includes in dbformat.h (#8930) 2021-09-29 04:04:40 -07:00
uncompression_dict_reader.h Extend Get/MultiGet deadline support to table open (#6982) 2020-06-29 14:53:17 -07:00