A library that provides an embeddable, persistent key-value store for fast storage.
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Anand Ananthabhotla b9d6eccac1 Lock free MultiGet (#4754)
Summary:
Avoid locking the DB mutex in order to reference SuperVersions. Instead, we get the thread local cached SuperVersion for each column family in the list. It depends on finding a sequence number that overlaps with all the open memtables. We start with the latest published sequence number, and if any of the memtables is sealed before we can get all the SuperVersions, the process is repeated. After a few times, give up and lock the DB mutex.

Tests:
1. Unit tests
2. make check
3. db_bench -

TEST_TMPDIR=/dev/shm ./db_bench -use_existing_db=true -benchmarks=readrandom -write_buffer_size=4194304 -target_file_size_base=4194304 -max_bytes_for_level_base=16777216 -num=5000000 -reads=1000000 -threads=32 -compression_type=none -cache_size=1048576000 -batch_size=1 -bloom_bits=1
readrandom   :       0.167 micros/op 5983920 ops/sec;  426.2 MB/s (1000000 of 1000000 found)

Multireadrandom with batch size 1:
multireadrandom :       0.176 micros/op 5684033 ops/sec; (1000000 of 1000000 found)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4754

Differential Revision: D13363550

Pulled By: anand1976

fbshipit-source-id: 6243e8de7dbd9c8bb490a8eca385da0c855b1dd4
2019-01-02 11:42:54 -08:00
buckifier Fix buck dev mode fbcode builds (#4747) 2018-12-05 10:40:31 -08:00
build_tools Fix spelling errors (#4827) 2019-01-02 11:17:57 -08:00
cache Revert "Move MemoryAllocator option from Cache to BlockBasedTableOpti… (#4697) 2018-11-21 11:29:57 -08:00
cmake Search paths provided by intel's "tbbvars.sh". 2018-05-07 14:28:36 -07:00
coverage Remove unused imports, from python scripts. (#4057) 2018-06-26 12:43:04 -07:00
db Lock free MultiGet (#4754) 2019-01-02 11:42:54 -08:00
docs Insane line length detected (#4813) 2018-12-21 14:54:34 -08:00
env Introduce a CPU time counter in perf_context (#4741) 2018-12-20 12:03:44 -08:00
examples Pin top-level index on partitioned index/filter blocks (#4037) 2018-06-22 15:27:46 -07:00
hdfs Update all unique/shared_ptr instances to be qualified with namespace std (#4638) 2018-11-09 11:19:58 -08:00
include/rocksdb Fix typos in comments (#4819) 2018-12-26 09:43:56 -08:00
java Fix typos in comments (#4819) 2018-12-26 09:43:56 -08:00
memtable WriteBufferManger doens't cost to cache if no limit is set (#4695) 2018-11-18 16:55:43 -08:00
monitoring Add a new per level counter for block cache hit (#4796) 2018-12-21 13:20:05 -08:00
options Concurrent task limiter for compaction thread control (#4332) 2018-12-13 13:18:28 -08:00
port Update all unique/shared_ptr instances to be qualified with namespace std (#4638) 2018-11-09 11:19:58 -08:00
table Add a new per level counter for block cache hit (#4796) 2018-12-21 13:20:05 -08:00
third-party Support pragma once in all header files and cleanup some warnings (#4339) 2018-09-05 18:13:31 -07:00
tools Enable DeleteRange in stress/crash tests (#4483) 2018-12-18 13:42:49 -08:00
util Compaction limiter miscs (#4795) 2018-12-26 13:59:35 -08:00
utilities Fix spelling errors (#4827) 2019-01-02 11:17:57 -08:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore RocksDB Trace Analyzer (#4091) 2018-08-13 11:44:02 -07:00
.lgtm.yml Create lgtm.yml for LGTM.com C/C++ analysis (#4058) 2018-06-26 12:43:04 -07:00
.travis.yml Fix printf formatting on MacOS (#4533) 2018-10-19 14:46:09 -07:00
appveyor.yml Upgrade Appveyor to VS2017 2018-02-01 13:57:01 -08:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Import library for DLL (i.e. rocksdb-shared.lib) requires ARCHIVE DESTINATION. (#4832) 2019-01-02 10:41:45 -08:00
CODE_OF_CONDUCT.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
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
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Lock free MultiGet (#4754) 2019-01-02 11:42:54 -08:00
INSTALL.md Update the version of the dependencies used by the RocksJava static build (#4761) 2018-12-18 20:25:43 -08:00
issue_template.md Add a template for issues 2017-09-29 11:41:28 -07:00
LANGUAGE-BINDINGS.md Added PingCaps Rust RocksDB and ObjectiveRocks (#4065) 2018-06-27 15:43:21 -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 building RocksDB for iOS (#4687) 2018-12-19 14:13:55 -08:00
README.md Create lgtm.yml for LGTM.com C/C++ analysis (#4058) 2018-06-26 12:43:04 -07:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
src.mk Remove v1 RangeDelAggregator (#4778) 2018-12-17 17:33:46 -08:00
TARGETS Remove v1 RangeDelAggregator (#4778) 2018-12-17 17:33:46 -08:00
thirdparty.inc Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00
USERS.md Adding IOTA Foundation to USERS.MD (#4436) 2018-10-02 10:03:46 -07:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md Add GCC 8 to Travis (#3433) 2018-07-13 10:58:06 -07:00

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

Linux/Mac Build Status Windows Build status PPC64le Build Status

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 specially 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.