rocksdb

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

Zhichao Cao fbda25f57a db_stress: generate the key based on Zipfian distribution (hot key) (#6163 ) Summary: In the current db_stress, all the keys are generated randomly and follows the uniform distribution. In order to test some corner cases that some key are always updated or read, we need to generate the key based on other distributions. In this PR, the key is generated based on Zipfian distribution and the skewness can be controlled by setting hot_key_alpha (0.8 to 1.5 is suggested). The larger hot_key_alpha is, the more skewed will be. Not that, usually, if hot_key_alpha is larger than 2, there might be only 1 or 2 keys that are generated. If hot_key_alpha is 0, it generate the key follows uniform distribution (random key) Testing plan: pass the db_stress and printed the keys to make sure it follows the distribution. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6163 Differential Revision: D18978480 Pulled By: zhichao-cao fbshipit-source-id: e123b4865477f7478e83fb581f9576bada334680		5 years ago
buckifier	PosixRandomAccessFile::MultiRead() to use I/O uring if supported (#5881 )	5 years ago
build_tools	Improve instructions to install formatter (#6162 )	5 years ago
cache	Remove key length assertion LRUHandle::CalcTotalCharge (#6115 )	5 years ago
cmake	cmake: do not build tests for Release build and cleanups (#5916 )	5 years ago
coverage	Fix interpreter lines for files with python2-only syntax.	6 years ago
db	Fix a data race related to memtable trimming (#6187 )	5 years ago
db_stress_tool	db_stress: generate the key based on Zipfian distribution (hot key) (#6163 )	5 years ago
docs	Blog post for write_unprepared (#5711 )	5 years ago
env	Fix unity test (#6178 )	5 years ago
examples	Add example to show the effect of Get in snapshot isolation (#6059 )	5 years ago
file	Introduce a new storage specific Env API (#5761 )	5 years ago
hdfs	Add copyright headers per FB open-source checkup tool. (#5199 )	6 years ago
include/rocksdb	Introduce a new storage specific Env API (#5761 )	5 years ago
java	Env should also load the native library (#6167 )	5 years ago
logging	Introduce a new storage specific Env API (#5761 )	5 years ago
memory	Charge block cache for cache internal usage (#5797 )	5 years ago
memtable	Misc hashing updates / upgrades (#5909 )	5 years ago
monitoring	Apply formatter to recent 200+ commits. (#5830 )	5 years ago
options	Introduce a new storage specific Env API (#5761 )	5 years ago
port	Work around weird unused errors with Mingw (#6075 )	5 years ago
table	Optimize memory and CPU for building new Bloom filter (#6175 )	5 years ago
test_util	Introduce a new storage specific Env API (#5761 )	5 years ago
third-party	Apply formatter to some recent commits (#6138 )	5 years ago
tools	Add long-running snapshots to stress tests (#6171 )	5 years ago
trace_replay	Misc hashing updates / upgrades (#5909 )	5 years ago
util	Optimize memory and CPU for building new Bloom filter (#6175 )	5 years ago
utilities	Make it possible to enable periodic compactions for BlobDB (#6172 )	5 years ago
.clang-format	A script that automatically reformat affected lines	11 years ago
.gitignore	Make buckifier python3 compatible (#5922 )	5 years ago
.lgtm.yml	Create lgtm.yml for LGTM.com C/C++ analysis (#4058 )	7 years ago
.travis.yml	cmake: do not build tests for Release build and cleanups (#5916 )	5 years ago
.watchmanconfig	Added .watchmanconfig file to rocksdb repo (#5593 )	6 years ago
AUTHORS	Update RocksDB Authors File	7 years ago
CMakeLists.txt	Introduce a new storage specific Env API (#5761 )	5 years ago
CODE_OF_CONDUCT.md	Adopt Contributor Covenant	5 years ago
CONTRIBUTING.md	Add Code of Conduct	7 years ago
COPYING	Add GPLv2 as an alternative license.	8 years ago
DEFAULT_OPTIONS_HISTORY.md	options.delayed_write_rate use the rate of rate_limiter by default.	8 years ago
DUMP_FORMAT.md	First version of rocksdb_dump and rocksdb_undump.	10 years ago
HISTORY.md	Introduce a new storage specific Env API (#5761 )	5 years ago
INSTALL.md	Update the version of the dependencies used by the RocksJava static build (#4761 )	6 years ago
LANGUAGE-BINDINGS.md	LANGUAGE-BINDINGS.md: mention python-rocksdb	6 years ago
LICENSE.Apache	Change RocksDB License	8 years ago
LICENSE.leveldb	Add back the LevelDB license file	8 years ago
Makefile	Add useful idioms to Random API (OneInOpt, PercentTrue) (#6154 )	5 years ago
README.md	Replaced some words (#5877 )	5 years ago
ROCKSDB_LITE.md	Fix some typos in comments and docs.	7 years ago
TARGETS	Introduce a new storage specific Env API (#5761 )	5 years ago
USERS.md	Add avrio to USERS.md (#5748 )	5 years ago
Vagrantfile	Adding CentOS 7 Vagrantfile & build script	7 years ago
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 )	6 years ago
appveyor.yml	Add Visual Studio 2015 to AppVeyor (#5446 )	5 years ago
defs.bzl	Add clarifying/instructive header to TARGETS and defs.bzl	5 years ago
issue_template.md	Add a template for issues	7 years ago
src.mk	Introduce a new storage specific Env API (#5761 )	5 years ago
thirdparty.inc	Fix build jemalloc api (#5470 )	6 years ago

README.md

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

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/

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.