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Andrew Kryczka 73a847ef89 Add per-level compression ratio property 
Summary:
This is needed so we can measure compression ratio improvements
achieved by D52287.

The property compares raw data size against the total file size for a given
level. If the level is empty it should return 0.0.

Test Plan: new unit test

Reviewers: IslamAbdelRahman, yhchiang, sdong

Reviewed By: sdong

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D56967
2016-04-20 18:46:54 -07:00
arcanist_util Propagate sandcastle run error to UI 2016-04-12 16:18:37 -07:00
build_tools New legocastle output parsing 2016-04-18 13:01:10 -07:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db Add per-level compression ratio property 2016-04-20 18:46:54 -07:00
doc Lint everything 2015-11-16 12:56:21 -08:00
examples Adding pin_l0_filter_and_index_blocks_in_cache feature and related fixes. 2016-04-01 10:42:39 -07:00
hdfs using java7 in runtime for hdfs env (#1072) 2016-04-12 00:08:26 -04:00
include/rocksdb Add per-level compression ratio property 2016-04-20 18:46:54 -07:00
java Delete deprecated backup classes in Java 2016-04-19 10:32:31 -07:00
memtable Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
port Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
table Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
third-party Fix the build break on Ubuntu 15.10 when gcc 5.2.1 is used 2016-03-15 10:30:10 -07:00
tools Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
util Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
utilities Delete deprecated *BackupableDB interface for backups 2016-04-18 09:04:14 -07:00
.arcconfig Integrate Jenkins with Phabricator 2015-04-07 11:56:29 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Ignore db_test2 2016-03-07 15:56:16 -08:00
.travis.yml Split Travis unittests Job 2016-04-13 14:22:29 -07:00
appveyor.yml Exclude DBTest.FileCreationRandomFailure as a long running test 2015-11-17 13:54:13 -08:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CMakeLists.txt Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
DEFAULT_OPTIONS_HISTORY.md Release RocksDB 4.7 2016-04-13 15:03:08 -07:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Add per-level compression ratio property 2016-04-20 18:46:54 -07:00
INSTALL.md Simple changes to support builds for ppc64[le] consistent with X86 2016-01-19 09:08:19 -06:00
LANGUAGE-BINDINGS.md Merge pull request #1056 from facebook/igorcanadi-patch-1 2016-04-04 08:08:52 -07:00
LICENSE Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
Makefile Split db_test.cc 2016-04-18 09:42:50 -07:00
PATENTS Update Patent Grant. 2015-04-13 10:33:43 +01:00
README.md Replaced "built on on earlier work" by "built on earlier work" in README.md 2014-09-17 01:16:17 -07:00
ROCKSDB_LITE.md Optimistic Transactions 2015-05-29 14:36:35 -07:00
src.mk Split db_test.cc 2016-04-18 09:42:50 -07:00
thirdparty.inc Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
USERS.md Added quasardb to the USERS.md file 2016-03-14 23:48:28 +01:00
Vagrantfile RocksDB on FreeBSD support 2015-02-26 15:19:17 -08:00
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

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/