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A library that provides an embeddable, persistent key-value store for fast storage.
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Chen Shen 78cb6b6112 Provide byte[] version of SstFileWriter.merge to reduce GC Stall 
Summary:
In Java API, `SstFileWriter.put/merge/delete` takes `Slice` type of key and value, which is a Java wrapper object around C++ Slice object.  The Slice object inherited [ `finalize`](3c327ac2d0/java/src/main/java/org/rocksdb/AbstractNativeReference.java (L69)) method, which [added huge overhead](https://softwareengineering.stackexchange.com/questions/288715/is-overriding-object-finalize-really-bad/288753#288753) to JVM while creating new SstFile.

To address this issue, this PR overload the merge method to take Java byte array instead of the Slice object, and added unit test for it.

We also benchmark these two different merge function, where we could see GC Stall reduced from 50%  to 1%, and the throughput increased from 50MB to 200MB.
Closes https://github.com/facebook/rocksdb/pull/2746

Reviewed By: sagar0

Differential Revision: D5653145

Pulled By: scv119

fbshipit-source-id: b55ea58554b573d0b1c6f6170f8d9223811bc4f5
2017-08-22 12:55:24 -07:00
buckifier rocksdb: make buildable on aarch64 2017-08-13 17:13:54 -07:00
build_tools Update RocksDBCommonHelper to use escapeshellarg 2017-08-15 06:56:31 -07:00
cache Circumvent ASAN false positive 2017-08-21 12:10:43 -07:00
cmake/modules cmake: support more compression type 2017-08-13 21:47:45 -07:00
coverage Fix /bin/bash shebangs 2017-08-03 15:56:46 -07:00
db add counter for deletion dropping optimization 2017-08-19 14:10:08 -07:00
docs 5.6.1 release blog post 2017-07-25 12:27:22 -07:00
env Introduce bottom-pri thread pool for large universal compactions 2017-08-03 15:43:29 -07:00
examples Replace dynamic_cast<> 2017-07-28 16:27:16 -07:00
hdfs Revert "comment out unused parameters" 2017-07-21 18:26:26 -07:00
include/rocksdb add counter for deletion dropping optimization 2017-08-19 14:10:08 -07:00
java Provide byte[] version of SstFileWriter.merge to reduce GC Stall 2017-08-22 12:55:24 -07:00
memtable Introduce bottom-pri thread pool for large universal compactions 2017-08-03 15:43:29 -07:00
monitoring Scale histogram bucket size by constant factor 2017-08-21 17:10:40 -07:00
options fix some misspellings 2017-08-16 21:57:20 -07:00
port fix WinEnv assertions 2017-08-08 17:20:52 -07:00
table Preload l0 index partitions 2017-08-18 10:56:20 -07:00
third-party Revert "comment out unused parameters" 2017-07-21 18:26:26 -07:00
tools fix db_stress uint64_t to int32 cast 2017-08-17 17:56:55 -07:00
util Support prefetch last 512KB with direct I/O in block based file reader 2017-08-11 12:16:45 -07:00
utilities Blob db create a snapshot before every read 2017-08-20 18:26:19 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Simple blob file dumper 2017-05-23 10:42:59 -07:00
.travis.yml Build fewer tests in Travis platform_dependent tests 2017-07-27 17:29:01 -07:00
appveyor.yml Rework test running script. 2017-04-05 11:39:20 -07:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CMakeLists.txt CMake improvements 2017-08-21 14:56:50 -07:00
CONTRIBUTING.md Remove the licensing description in CONTRIBUTING.md 2017-07-16 15:57:18 -07:00
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 Scale histogram bucket size by constant factor 2017-08-21 17:10:40 -07:00
INSTALL.md add vcpkg as an windows option 2017-07-24 15:12:45 -07:00
LANGUAGE-BINDINGS.md Adding Dlang to the list 2017-02-16 17:24:10 -08:00
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 Overload new[] to properly align LRUCacheShard 2017-08-14 14:41:56 -07:00
README.md Appveyor badge to show master branch 2016-07-26 13:54:08 -07:00
ROCKSDB_LITE.md Optimistic Transactions 2015-05-29 14:36:35 -07:00
src.mk Refactor PessimisticTransaction 2017-08-07 16:12:29 -07:00
TARGETS rocksdb: make buildable on aarch64 2017-08-13 17:13:54 -07:00
thirdparty.inc Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
USERS.md Update USERS.md 2017-08-06 12:44:40 -07:00
Vagrantfile Update Vagrant file (test internal phabricator workflow) 2016-10-28 15:39:19 -07:00
WINDOWS_PORT.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00

README.md

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

Build Status 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/