A library that provides an embeddable, persistent key-value store for fast storage.
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Mark Callaghan 63a284a6ad For db_bench --benchmarks=fillseq with --num_multi_db load databases … (#9713)
Summary:
…in order

This fixes https://github.com/facebook/rocksdb/issues/9650
For db_bench --benchmarks=fillseq --num_multi_db=X it loads databases in sequence
rather than randomly choosing a database per Put. The benefits are:
1) avoids long delays between flushing memtables
2) avoids flushing memtables for all of them at the same point in time
3) puts same number of keys per database so that query tests will find keys as expected

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9713

Test Plan:
Using db_bench.1 without the change and db_bench.2 with the change:

for i in 1 2; do rm -rf /data/m/rx/* ; time ./db_bench.$i --db=/data/m/rx --benchmarks=fillseq --num_multi_db=4 --num=10000000; du -hs /data/m/rx ; done

 --- without the change
    fillseq      :       3.188 micros/op 313682 ops/sec;   34.7 MB/s
    real    2m7.787s
    user    1m52.776s
    sys     0m46.549s
    2.7G    /data/m/rx

 --- with the change

    fillseq      :       3.149 micros/op 317563 ops/sec;   35.1 MB/s
    real    2m6.196s
    user    1m51.482s
    sys     0m46.003s
    2.7G    /data/m/rx

    Also, temporarily added a printf to confirm that the code switches to the next database at the right time
    ZZ switch to db 1 at 10000000
    ZZ switch to db 2 at 20000000
    ZZ switch to db 3 at 30000000

for i in 1 2; do rm -rf /data/m/rx/* ; time ./db_bench.$i --db=/data/m/rx --benchmarks=fillseq,readrandom --num_multi_db=4 --num=100000; du -hs /data/m/rx ; done

 --- without the change, smaller database, note that not all keys are found by readrandom because databases have < and > --num keys

    fillseq      :       3.176 micros/op 314805 ops/sec;   34.8 MB/s
    readrandom   :       1.913 micros/op 522616 ops/sec;   57.7 MB/s (99873 of 100000 found)

 --- with the change, smaller database, note that all keys are found by readrandom

    fillseq      :       3.110 micros/op 321566 ops/sec;   35.6 MB/s
    readrandom   :       1.714 micros/op 583257 ops/sec;   64.5 MB/s (100000 of 100000 found)

Reviewed By: jay-zhuang

Differential Revision: D35030168

Pulled By: mdcallag

fbshipit-source-id: 2a18c4ec571d954cf5a57b00a11802a3608823ee
2022-03-22 10:36:24 -07:00
.circleci Enable detect_stack_use_after_return for ASAN (#9714) 2022-03-21 10:34:11 -07:00
.github/workflows Use released clang-format instead of the one from dev branch (#9646) 2022-03-01 10:51:38 -08:00
buckifier regenerate config jsons, reduce noise (#9644) 2022-03-01 15:09:45 -08:00
build_tools Enable detect_stack_use_after_return for ASAN (#9714) 2022-03-21 10:34:11 -07:00
cache Update Cache::Release param from force_erase to erase_if_last_ref (#9728) 2022-03-22 10:22:18 -07:00
cmake gcc-11 and cmake related cleanup (#9286) 2021-12-17 17:04:35 -08:00
coverage Remove asan_symbolize.py for internal asan build (#8737) 2021-09-07 15:39:11 -07:00
db Update Cache::Release param from force_erase to erase_if_last_ref (#9728) 2022-03-22 10:22:18 -07:00
db_stress_tool New backup meta schema, with file temperatures (#9660) 2022-03-18 11:06:17 -07:00
docs Update Githubpages version (#9670) 2022-03-07 14:48:06 -08:00
env Fix a bug in PosixClock (#9695) 2022-03-21 16:11:02 -07:00
examples Remove BlockBasedTableOptions.hash_index_allow_collision (#9454) 2022-03-01 13:58:02 -08:00
file Provide implementation to prefetch data asynchronously in FilePrefetchBuffer (#9674) 2022-03-21 07:12:43 -07:00
fuzz Fix compilation errors and add fuzzers to CircleCI (#9420) 2022-02-01 10:32:15 -08:00
include/rocksdb Update Cache::Release param from force_erase to erase_if_last_ref (#9728) 2022-03-22 10:22:18 -07:00
java NPE in Java_org_rocksdb_ColumnFamilyOptions_setSstPartitionerFactory (#9622) 2022-03-14 14:12:30 -07:00
logging Use system-wide thread ID in info log lines (#9164) 2021-11-12 19:46:06 -08:00
memory Return different Status based on ObjectRegistry::NewObject calls (#9333) 2022-02-11 05:11:24 -08:00
memtable Remove using namespace (#9369) 2022-01-12 09:31:12 -08:00
microbench regenerate config jsons, reduce noise (#9644) 2022-03-01 15:09:45 -08:00
monitoring Dedicate cacheline for DB mutex (#9637) 2022-02-27 11:36:54 -08:00
options Provide implementation to prefetch data asynchronously in FilePrefetchBuffer (#9674) 2022-03-21 07:12:43 -07:00
plugin Add initial CMake support to plugin (#9214) 2021-11-30 17:16:53 -08:00
port #include <winioctl.h> as MSDN prescribes (#9612) 2022-03-13 17:01:21 -07:00
table Update Cache::Release param from force_erase to erase_if_last_ref (#9728) 2022-03-22 10:22:18 -07:00
test_util Remove BlockBasedTableOptions.hash_index_allow_collision (#9454) 2022-03-01 13:58:02 -08:00
third-party Work around some new clang-analyze failures (#9515) 2022-02-07 18:24:36 -08:00
tools For db_bench --benchmarks=fillseq with --num_multi_db load databases … (#9713) 2022-03-22 10:36:24 -07:00
trace_replay Added TraceOptions::preserve_write_order (#9334) 2021-12-28 15:04:26 -08:00
util Add manifest fix-up utility for file temperatures (#9683) 2022-03-18 16:35:51 -07:00
utilities Update Cache::Release param from force_erase to erase_if_last_ref (#9728) 2022-03-22 10:22:18 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore gitignore cmake-build-* for CLion integration (#7933) 2021-02-19 13:43:15 -08:00
.lgtm.yml Create lgtm.yml for LGTM.com C/C++ analysis (#4058) 2018-06-26 12:43:04 -07:00
.travis.yml Reenable s390x platform_dependent travis job (#9631) 2022-03-01 13:50:41 -08:00
.watchmanconfig Added .watchmanconfig file to rocksdb repo (#5593) 2019-07-19 15:00:33 -07:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Avoid popcnt on Windows when unavailable and in portable builds (#9680) 2022-03-09 21:07:31 -08:00
CODE_OF_CONDUCT.md Adopt Contributor Covenant 2019-08-29 23:21:01 -07:00
CONTRIBUTING.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
COPYING Add GPLv2 as an alternative license. 2017-04-27 18:06:12 -07:00
crash_test.mk Improve stress test for transactions (#9568) 2022-03-16 19:00:04 -07:00
DEFAULT_OPTIONS_HISTORY.md Add Options::DisableExtraChecks, clarify force_consistency_checks (#9363) 2022-01-18 17:31:03 -08:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Update HISTORY.md and version.h for 7.1 release (#9727) 2022-03-21 19:48:41 -07:00
INSTALL.md Clarify Google benchmark < 1.6.0 in INSTALL.md (#9505) 2022-02-07 10:00:46 -08:00
issue_template.md Add Google Group to Issue Template 2020-01-28 14:40:37 -08:00
LANGUAGE-BINDINGS.md Update branch name to "main" in README/LANGUAGE_BINDINGS (#8727) 2021-09-01 15:26:34 -07:00
LICENSE.Apache Change RocksDB License 2017-07-15 16:11:23 -07:00
LICENSE.leveldb Add back the LevelDB license file 2017-07-16 18:42:18 -07:00
Makefile Enable detect_stack_use_after_return for ASAN (#9714) 2022-03-21 10:34:11 -07:00
PLUGINS.md Move RADOS support to separate repo (#9206) 2022-01-24 22:50:07 -08:00
python.mk crash_test Makefile refactoring, add to CircleCI (#9702) 2022-03-16 15:58:06 -07:00
README.md README: De-list slack channel, list Google group (#9387) 2022-01-18 08:19:48 -08:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
src.mk Support user-defined timestamps in write-committed txns (#9629) 2022-03-08 16:20:59 -08:00
TARGETS Support user-defined timestamps in write-committed txns (#9629) 2022-03-08 16:20:59 -08:00
thirdparty.inc Fix build jemalloc api (#5470) 2019-06-24 17:40:32 -07:00
USERS.md Add Solana's RocksDB use case in USERS.md (#9558) 2022-02-16 09:23:01 -08:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md Update branch name in WINDOWS_PORT.md (#8745) 2021-09-01 19:26:39 -07:00

RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.