fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Yanqin Jin 82b3888433 Enable backward iterator for keys with user-defined timestamp (#8035) ... Summary: This PR does the following: - Enable backward iteration for keys with user-defined timestamp. Note that merge, single delete, range delete are not supported yet. - Introduces a new helper API `Comparator::EqualWithoutTimestamp()`. - Fix a typo in `SetTimestamp()`. - Add/update unit tests Run db_bench (built with DEBUG_LEVEL=0) to demonstrate that no overhead is introduced for CPU-intensive workloads with a lot of `Prev()`. Also provided results of iterating keys with timestamps. 1. Disable timestamp, run: ``` ./db_bench -db=/dev/shm/rocksdb -disable_wal=1 -benchmarks=fillseq,seekrandom[-W1-X6] -reverse_iterator=1 -seek_nexts=5 ``` Results: > Baseline > - seekrandom [AVG 6 runs] : 96115 ops/sec; 53.2 MB/sec > - seekrandom [MEDIAN 6 runs] : 98075 ops/sec; 54.2 MB/sec > > This PR > - seekrandom [AVG 6 runs] : 95521 ops/sec; 52.8 MB/sec > - seekrandom [MEDIAN 6 runs] : 96338 ops/sec; 53.3 MB/sec 2. Enable timestamp, run: ``` ./db_bench -user_timestamp_size=8 -db=/dev/shm/rocksdb -disable_wal=1 -benchmarks=fillseq,seekrandom[-W1-X6] -reverse_iterator=1 -seek_nexts=5 ``` Result: > Baseline: not supported > > This PR > - seekrandom [AVG 6 runs] : 90514 ops/sec; 50.1 MB/sec > - seekrandom [MEDIAN 6 runs] : 90834 ops/sec; 50.2 MB/sec Pull Request resolved: https://github.com/facebook/rocksdb/pull/8035 Reviewed By: ltamasi Differential Revision: D26926668 Pulled By: riversand963 fbshipit-source-id: 95330cc2242397c03e09d29e5417dfb0adc98ef5		4 years ago
..
compaction.cc	Expand effect of dictionary settings in `ColumnFamilyOptions::compression_opts` (#7619)	4 years ago
compaction.h	SST Partitioner interface that allows to split SST files (#6957)	4 years ago
compaction_iteration_stats.h	Update compaction statistics to include the amount of data read from blob files (#8022)	4 years ago
compaction_iterator.cc	Enable backward iterator for keys with user-defined timestamp (#8035)	4 years ago
compaction_iterator.h	Add a SystemClock class to capture the time functions of an Env (#7858)	4 years ago
compaction_iterator_test.cc	Fix a SingleDelete related optimization for blob indexes (#7904)	4 years ago
compaction_job.cc	Update compaction statistics to include the amount of data read from blob files (#8022)	4 years ago
compaction_job.h	Add a SystemClock class to capture the time functions of an Env (#7858)	4 years ago
compaction_job_stats_test.cc	Add more tests to ASSERT_STATUS_CHECKED (3), API change (#7715)	4 years ago
compaction_job_test.cc	Remove Legacy and Custom FileWrapper classes from header files (#7851)	4 years ago
compaction_picker.cc	Always apply bottommost_compression_opts when enabled (#7633)	4 years ago
compaction_picker.h	Make max_subcompactions dynamically changeable (#7159)	4 years ago
compaction_picker_fifo.cc	Make max_subcompactions dynamically changeable (#7159)	4 years ago
compaction_picker_fifo.h	Make max_subcompactions dynamically changeable (#7159)	4 years ago
compaction_picker_level.cc	Make max_subcompactions dynamically changeable (#7159)	4 years ago
compaction_picker_level.h	Make max_subcompactions dynamically changeable (#7159)	4 years ago
compaction_picker_test.cc	Add more tests for assert status checked (#7524)	4 years ago
compaction_picker_universal.cc	Make sure assert(false) handles failures too (#7483)	4 years ago
compaction_picker_universal.h	Make max_subcompactions dynamically changeable (#7159)	4 years ago
sst_partitioner.cc	SST Partitioner interface that allows to split SST files (#6957)	4 years ago