A library that provides an embeddable, persistent key-value store for fast storage.
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Levi Tamasi f2228962c5 Fix a data race related to DB properties (#8206)
Summary:
Historically, the DB properties `rocksdb.cur-size-active-mem-table`,
`rocksdb.cur-size-all-mem-tables`, and `rocksdb.size-all-mem-tables` called
the method `MemTable::ApproximateMemoryUsage` for mutable memtables,
which is not safe without synchronization. This resulted in data races with
memtable inserts. The patch changes the code handling these properties
to use `MemTable::ApproximateMemoryUsageFast` instead, which returns a
cached value backed by an atomic variable. Two test cases had to be updated
for this change. `MemoryTest.MemTableAndTableReadersTotal` was fixed by
increasing the value size used so each value ends up in its own memtable,
which was the original intention (note: the test has been broken in the sense
that the test code didn't consider that memtable sizes below 64 KB get
increased to 64 KB by `SanitizeOptions`, and has been passing only by
accident). `DBTest.MemoryUsageWithMaxWriteBufferSizeToMaintain` relies on
completely up-to-date values and thus was changed to use `ApproximateMemoryUsage`
directly instead of going through the DB properties. Note: this should be safe in this case
since there's only a single thread involved.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8206

Test Plan: `make check`

Reviewed By: riversand963

Differential Revision: D27866811

Pulled By: ltamasi

fbshipit-source-id: 7bd754d0565e0a65f1f7f0e78ffc093beef79394
2021-04-20 10:17:49 -07:00
.circleci Make tests "parallel" and "passing ASC" by default (#8146) 2021-04-04 20:10:11 -07:00
.github/workflows Update clang-format-diff.py path (#7944) 2021-02-09 12:49:38 -08:00
buckifier Make tests "parallel" and "passing ASC" by default (#8146) 2021-04-04 20:10:11 -07:00
build_tools Fix crash test with backup as read-only DB (#8161) 2021-04-06 23:31:51 -07:00
cache Fix some typos in comments (#8066) 2021-03-25 21:18:08 -07:00
cmake Add find_dependency() in cmake config file. (#6791) 2020-05-12 21:18:29 -07:00
coverage Find the correct gcov (#6904) 2020-06-01 16:33:05 -07:00
db Fix a data race related to DB properties (#8206) 2021-04-20 10:17:49 -07:00
db_stress_tool Ribbon long-term support, starting level support (#8198) 2021-04-16 15:43:08 -07:00
docs Add Blog Post "(Call For Contribution) Make Universal Compaction More Incremental" (#8182) 2021-04-13 13:18:47 -07:00
env Integrated BlobDB for backup/restore support (#8129) 2021-04-07 13:38:54 -07:00
examples make:Fix c header prototypes (#7994) 2021-03-09 20:44:23 -08:00
file Handle rename() failure in non-local FS (#8192) 2021-04-19 20:29:21 -07:00
fuzz Remove Legacy and Custom FileWrapper classes from header files (#7851) 2021-01-28 22:10:32 -08:00
hdfs fix build with 'USE_HDFS' on windows (#6950) 2020-06-12 16:21:50 -07:00
include/rocksdb Update HISTORY and bump version 2021-04-19 20:30:06 -07:00
java Handle rename() failure in non-local FS (#8192) 2021-04-19 20:29:21 -07:00
logging Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
memory Use thread-safe strerror_r() to get error message (#8087) 2021-03-24 23:07:27 -07:00
memtable Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
monitoring Disable IOStatsContext/PerfContext if no thread local (#8117) 2021-04-13 07:56:59 -07:00
options Ribbon long-term support, starting level support (#8198) 2021-04-16 15:43:08 -07:00
plugin Makefile support to statically link external plugin code (#7918) 2021-02-10 08:35:34 -08:00
port Fix Windows strcmp for Unicode (#8190) 2021-04-16 12:11:16 -07:00
table Ribbon long-term support, starting level support (#8198) 2021-04-16 15:43:08 -07:00
test_util Unittest uses unique test db name (#8124) 2021-03-30 16:51:26 -07:00
third-party Fix a compilation error in CircleCI vs2019 CXX20 (#8090) 2021-03-23 10:28:04 -07:00
tools Ribbon long-term support, starting level support (#8198) 2021-04-16 15:43:08 -07:00
trace_replay Add request_id in IODebugContext. (#8045) 2021-04-01 13:14:51 -07:00
util Ribbon long-term support, starting level support (#8198) 2021-04-16 15:43:08 -07:00
utilities Fix a data race related to DB properties (#8206) 2021-04-20 10:17:49 -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 use LIB_MODE=shared on Travis make commands (#8043) 2021-03-08 17:21:24 -08:00
.watchmanconfig Added .watchmanconfig file to rocksdb repo (#5593) 2019-07-19 15:00:33 -07:00
appveyor.yml Remove 2019 from appveyor (#7038) 2020-06-29 14:31:41 -07:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Disable IOStatsContext/PerfContext if no thread local (#8117) 2021-04-13 07:56:59 -07:00
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
DEFAULT_OPTIONS_HISTORY.md options.delayed_write_rate use the rate of rate_limiter by default. 2017-05-24 09:58:24 -07:00
defs.bzl Make testpilot recognize that these tests have coverage instrumentation 2020-03-20 11:23:23 -07:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Update HISTORY and bump version 2021-04-19 20:30:06 -07:00
INSTALL.md Update installation instructions (#8158) 2021-04-06 16:02:04 -07:00
issue_template.md Add Google Group to Issue Template 2020-01-28 14:40:37 -08:00
LANGUAGE-BINDINGS.md Add RestoreDBFromLatestBackup to C API, add new C# package (#7092) 2020-07-08 11:56:41 -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 Fix Makefile when multiple targets are invoked (#8195) 2021-04-16 08:34:59 -07:00
PLUGINS.md Makefile support to statically link external plugin code (#7918) 2021-02-10 08:35:34 -08:00
README.md Fix the CI badge for ppc64le Jenkins (#7561) 2020-10-16 09:00:56 -07:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
src.mk Add util/crc32c_arm64.cc to TARGETS (#8168) 2021-04-12 10:57:56 -07:00
TARGETS Add util/crc32c_arm64.cc to TARGETS (#8168) 2021-04-12 10:57:56 -07:00
thirdparty.inc Fix build jemalloc api (#5470) 2019-06-24 17:40:32 -07:00
USERS.md Add Apache Doris to USERS (#7865) 2021-01-19 15:31:56 -08:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md #5145 , rename port/dirent.h to port/port_dirent.h to avoid compile err when use port dir as header dir output (#5152) 2019-04-04 11:38:19 -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/master/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.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/

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.