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Andrew Kryczka dd29ad4223 Separate internal and user key comparators in BlockIter (#6944) 
Summary:
Replace `BlockIter::comparator_` and `IndexBlockIter::user_comparator_wrapper_` with a concrete `UserComparatorWrapper` and `InternalKeyComparator`. The motivation for this change was the inconvenience of not knowing the concrete type of `BlockIter::comparator_`, which prevented calling specialized internal key comparison functions to optimize comparison of keys with global seqno applied.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/6944

Test Plan:
benchmark setup -- single file DBs, in-memory, no compression. "normal_db"
created by regular flush; "ingestion_db" created by ingesting a file. Both
DBs have same contents.

```
$ TEST_TMPDIR=/dev/shm/normal_db/ ./db_bench -benchmarks=fillrandom,compact -write_buffer_size=10485760000 -disable_auto_compactions=true -compression_type=none -num=1000000
$ ./ldb write_extern_sst ./tmp.sst --db=/dev/shm/ingestion_db/dbbench/ --compression_type=no --hex --create_if_missing < <(./sst_dump --command=scan --output_hex --file=/dev/shm/normal_db/dbbench/000007.sst | awk 'began {print "0x" substr($1, 2, length($1) - 2), "==>", "0x" $5} ; /^Sst file format: block-based/ {began=1}')
$ ./ldb ingest_extern_sst ./tmp.sst --db=/dev/shm/ingestion_db/dbbench/
```

benchmark run command:

```
$ TEST_TMPDIR=/dev/shm/$DB/ ./db_bench -benchmarks=seekrandom -seek_nexts=$SEEK_NEXT -use_existing_db=true -cache_index_and_filter_blocks=false -num=1000000 -cache_size=0 -threads=1 -reads=200000000 -mmap_read=1 -verify_checksum=false
```

results: perf improved marginally for ingestion_db and did not change significantly for normal_db:

SEEK_NEXT | DB | code | ops/sec | % change
-- | -- | -- | -- | --
0 | normal_db | master | 350880 |  
0 | normal_db | PR6944 | 351040 | 0.0
0 | ingestion_db | master | 343255 |  
0 | ingestion_db | PR6944 | 349424 | 1.8
10 | normal_db | master | 218711 |  
10 | normal_db | PR6944 | 217892 | -0.4
10 | ingestion_db | master | 220334 |  
10 | ingestion_db | PR6944 | 226437 | 2.8

Reviewed By: pdillinger

Differential Revision: D21924676

Pulled By: ajkr

fbshipit-source-id: ea4288a2eefa8112eb6c651a671c1de18c12e538
2020-07-07 17:26:16 -07:00
..
aligned_buffer.h Remove memcpy from RandomAccessFileReader::Read in direct IO mode (#6455) 2020-03-06 14:05:12 -08:00
autovector.h Change autovector to have a reserved size in LITE mode (#6868) 2020-05-21 14:48:10 -07:00
autovector_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
bloom_impl.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
bloom_test.cc Minimize memory internal fragmentation for Bloom filters (#6427) 2020-06-22 13:32:07 -07:00
build_version.cc.in
build_version.h
cast_util.h Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
channel.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
coding.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
coding.h Clean up some code related to file checksums (#6861) 2020-05-21 08:12:51 -07:00
coding_test.cc Fix potential overflow of unsigned type in for loop (#6902) 2020-06-02 15:05:07 -07:00
compaction_job_stats_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
comparator.cc Iterator with timestamp (#6255) 2020-03-06 16:24:27 -08:00
compression.h Add tests for compression failure in BlockBasedTableBuilder (#6709) 2020-05-12 09:27:35 -07:00
compression_context_cache.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
compression_context_cache.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
concurrent_task_limiter_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
concurrent_task_limiter_impl.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
core_local.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
crc32c.cc C++20 compatibility (#6697) 2020-04-20 13:24:25 -07:00
crc32c.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
crc32c_arm64.cc Suppress UBSAN warning in CRC32 ARM (#6827) 2020-05-08 14:14:00 -07:00
crc32c_arm64.h
crc32c_ppc.c
crc32c_ppc.h
crc32c_ppc_asm.S
crc32c_ppc_constants.h
crc32c_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
defer.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
defer_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
duplicate_detector.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
dynamic_bloom.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
dynamic_bloom.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
dynamic_bloom_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
file_checksum_helper.cc Add NewFileChecksumGenCrc32cFactory to file checksum (#6688) 2020-04-13 19:13:41 -07:00
file_checksum_helper.h Clean up some code related to file checksums (#6861) 2020-05-21 08:12:51 -07:00
file_reader_writer_test.cc Revert "Update googletest from 1.8.1 to 1.10.0 (#6808)" (#6923) 2020-06-03 15:55:03 -07:00
filelock_test.cc filelock_test: add freebsd headers for waitpid (#7010) 2020-06-25 17:25:42 -07:00
filter_bench.cc Minimize memory internal fragmentation for Bloom filters (#6427) 2020-06-22 13:32:07 -07:00
gflags_compat.h
hash.cc C++20 compatibility (#6697) 2020-04-20 13:24:25 -07:00
hash.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
hash_map.h Change HashMap::Insert()'s value to a const reference (#6567) 2020-03-20 14:59:54 -07:00
hash_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
heap.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
heap_test.cc Revert "Update googletest from 1.8.1 to 1.10.0 (#6808)" (#6923) 2020-06-03 15:55:03 -07:00
kv_map.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
log_write_bench.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
math.h Basic MultiGet support for partitioned filters (#6757) 2020-04-28 14:49:34 -07:00
murmurhash.cc C++20 compatibility (#6697) 2020-04-20 13:24:25 -07:00
murmurhash.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
mutexlock.h Prevents Table Cache to open same files more times (#6707) 2020-04-21 13:16:31 -07:00
ppc-opcode.h
random.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
random.h C++20 compatibility (#6697) 2020-04-20 13:24:25 -07:00
random_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
rate_limiter.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
rate_limiter.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
rate_limiter_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
repeatable_thread.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
repeatable_thread_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
set_comparator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
slice.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
slice_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
slice_transform_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
status.cc prototype status check enforcement (#6798) 2020-05-08 12:40:43 -07:00
stderr_logger.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
stop_watch.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
string_util.cc Add Struct Type to OptionsTypeInfo (#6425) 2020-05-21 10:58:39 -07:00
string_util.h Add Struct Type to OptionsTypeInfo (#6425) 2020-05-21 10:58:39 -07:00
thread_list_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
thread_local.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
thread_local.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
thread_local_test.cc Fix ThreadLocalTest.SequentialReadWriteTest failure when running individually (#6929) 2020-06-04 11:44:09 -07:00
thread_operation.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
threadpool_imp.cc Make it able to lower cpu priority to specific level in threadpool (#6969) 2020-06-13 13:25:20 -07:00
threadpool_imp.h Make it able to lower cpu priority to specific level in threadpool (#6969) 2020-06-13 13:25:20 -07:00
timer.h Add a simple timer support to schedule work at fixed times/intervals (#6543) 2020-04-07 11:55:27 -07:00
timer_queue.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
timer_queue_test.cc
timer_test.cc Disable a few timer tests (#6833) 2020-05-11 13:30:00 -07:00
user_comparator_wrapper.h Separate internal and user key comparators in BlockIter (#6944) 2020-07-07 17:26:16 -07:00
vector_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
work_queue.h Revamp cache_bench to resemble a real workload (#6629) 2020-04-03 10:26:49 -07:00
work_queue_test.cc Add pipelined & parallel compression optimization (#6262) 2020-04-01 16:40:18 -07:00
xxh3p.h Remove XXH3(preview) streaming APIs (#6540) 2020-03-16 17:02:00 -07:00
xxhash.cc C++20 compatibility (#6697) 2020-04-20 13:24:25 -07:00
xxhash.h