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rocksdb/table/block_based
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Andrew Kryczka e6be168aa5 save a key comparison in block seeks (#6646) 
Summary:
This saves up to two key comparisons in block seeks. The first key
comparison saved is a redundant key comparison against the restart key
where the linear scan starts. This comparison is saved in all cases
except when the found key is in the first restart interval. The
second key comparison saved is a redundant key comparison against the
restart key where the linear scan ends. This is only saved in cases
where all keys in the restart interval are less than the target
(probability roughly `1/restart_interval`).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6646

Test Plan:
ran a benchmark with mostly default settings and counted key comparisons

before: `user_key_comparison_count = 19399529`
after: `user_key_comparison_count = 18431498`

setup command:

```
$ TEST_TMPDIR=/dev/shm/dbbench ./db_bench -benchmarks=fillrandom,compact -write_buffer_size=1048576 -target_file_size_base=1048576 -max_bytes_for_level_base=4194304 -max_background_jobs=12 -level_compaction_dynamic_level_bytes=true -num=10000000
```

benchmark command:

```
$ TEST_TMPDIR=/dev/shm/dbbench/ ./db_bench -use_existing_db=true -benchmarks=readrandom -disable_auto_compactions=true -num=10000000 -compression_type=none -reads=1000000 -perf_level=3
```

Reviewed By: pdillinger

Differential Revision: D20849707

Pulled By: ajkr

fbshipit-source-id: 1f01c5cd99ea771fd27974046e37b194f1cdcfac
 		2020-06-10 13:58:39 -07:00
..
binary_search_index_reader.cc Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
binary_search_index_reader.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
block.cc save a key comparison in block seeks (#6646) 2020-06-10 13:58:39 -07:00
block.h save a key comparison in block seeks (#6646) 2020-06-10 13:58:39 -07:00
block_based_filter_block.cc Reduce dependency on gtest dependency in release code (#6907) 2020-06-02 12:11:24 -07:00
block_based_filter_block.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
block_based_filter_block_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
block_based_table_builder.cc Remove unnecessary inclusion of version_edit.h in env (#6952) 2020-06-07 21:56:55 -07:00
block_based_table_builder.h Disallow BlockBasedTableBuilder to set status from non-OK (#6776) 2020-04-30 15:37:03 -07:00
block_based_table_factory.cc make L0 index/filter pinned memory usage predictable (#6911) 2020-06-09 16:51:23 -07:00
block_based_table_factory.h sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
block_based_table_iterator.cc Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
block_based_table_iterator.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
block_based_table_reader.cc make L0 index/filter pinned memory usage predictable (#6911) 2020-06-09 16:51:23 -07:00
block_based_table_reader.h make L0 index/filter pinned memory usage predictable (#6911) 2020-06-09 16:51:23 -07:00
block_based_table_reader_impl.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
block_based_table_reader_test.cc Check iterator status BlockBasedTableReader::VerifyChecksumInBlocks() (#6909) 2020-06-05 11:08:25 -07:00
block_builder.cc Add pipelined & parallel compression optimization (#6262) 2020-04-01 16:40:18 -07:00
block_builder.h Add pipelined & parallel compression optimization (#6262) 2020-04-01 16:40:18 -07:00
block_prefetcher.cc De-template block based table iterator (#6531) 2020-03-16 12:20:50 -07:00
block_prefetcher.h De-template block based table iterator (#6531) 2020-03-16 12:20:50 -07:00
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 Revert "Update googletest from 1.8.1 to 1.10.0 (#6808)" (#6923) 2020-06-03 15:55:03 -07:00
block_type.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
cachable_entry.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
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.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
data_block_hash_index_test.cc Fix range deletion tombstone ingestion with global seqno (#6429) 2020-02-25 15:31:48 -08:00
filter_block.h Fix iterator reading filter block despite read_tier == kBlockCacheTier (#6562) 2020-03-26 15:21:26 -07:00
filter_block_reader_common.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filter_block_reader_common.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
filter_policy.cc Add Functions to OptionTypeInfo (#6422) 2020-04-28 18:04:26 -07:00
filter_policy_internal.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
flush_block_policy.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
flush_block_policy.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
full_filter_block.cc Reduce dependency on gtest dependency in release code (#6907) 2020-06-02 12:11:24 -07:00
full_filter_block.h Fix iterator reading filter block despite read_tier == kBlockCacheTier (#6562) 2020-03-26 15:21:26 -07:00
full_filter_block_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
hash_index_reader.cc Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
hash_index_reader.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
index_builder.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
index_builder.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
index_reader_common.cc Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -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 For ApproximateSizes, pro-rate table metadata size over data blocks (#6784) 2020-06-02 12:30:23 -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 Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
partitioned_filter_block.cc Fix handling of too-small filter partition size (#6905) 2020-06-03 10:43:01 -07:00
partitioned_filter_block.h Basic MultiGet support for partitioned filters (#6757) 2020-04-28 14:49:34 -07:00
partitioned_filter_block_test.cc Revert "Update googletest from 1.8.1 to 1.10.0 (#6808)" (#6923) 2020-06-03 15:55:03 -07:00
partitioned_index_iterator.cc Fix regression bug in partitioned index reseek caused by #6531 (#6551) 2020-03-17 12:33:10 -07:00
partitioned_index_iterator.h Check iterator status BlockBasedTableReader::VerifyChecksumInBlocks() (#6909) 2020-06-05 11:08:25 -07:00
partitioned_index_reader.cc Reduce dependency on gtest dependency in release code (#6907) 2020-06-02 12:11:24 -07:00
partitioned_index_reader.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
reader_common.cc Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
reader_common.h Divide block_based_table_reader.cc (#6527) 2020-03-12 21:41:50 -07:00
uncompression_dict_reader.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
uncompression_dict_reader.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00