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Yueh-Hsuan Chiang 181191a1e4 Add a counter for collecting the wait time on db mutex. 
Summary:
Add a counter for collecting the wait time on db mutex.
Also add MutexWrapper and CondVarWrapper for measuring wait time.

Test Plan:
./db_test
export ROCKSDB_TESTS=MutexWaitStats
./db_test

verify stats output using db_bench
make clean
make release
./db_bench --statistics=1 --benchmarks=fillseq,readwhilewriting --num=10000 --threads=10

Sample output:
    rocksdb.db.mutex.wait.micros COUNT : 7546866

Reviewers: MarkCallaghan, rven, sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D32787
2015-02-04 21:39:45 -08:00
build_tools rocksdb: Enable scan-build static analysis 2015-02-03 21:43:06 -08:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db Add a counter for collecting the wait time on db mutex. 2015-02-04 21:39:45 -08:00
doc Remove seek compaction 2014-06-20 10:23:02 +02:00
examples Updated .gitignore to ignore *~ files and example object files 2015-01-27 20:03:57 -05:00
hdfs Replace exception by abort() in dummy HdfsEnv implementation. 2014-12-05 13:30:57 -08:00
include Add a counter for collecting the wait time on db mutex. 2015-02-04 21:39:45 -08:00
java Release.md - Remove version change instrcution 2015-02-01 14:32:51 +01:00
linters Fix linters 2014-12-02 13:53:39 -05:00
port Fix stack trace on mac 2015-02-04 16:24:02 -08:00
table Get() to use prefix bloom filter when filter is not block based 2015-02-04 15:15:41 -08:00
third-party/rapidjson Fix a rapidjson compile error in mac. 2014-06-23 17:09:24 -06:00
tools Remove blob store from the codebase 2015-01-27 16:55:33 -08:00
util Add a counter for collecting the wait time on db mutex. 2015-02-04 21:39:45 -08:00
utilities NewIteratorWithBase() for default column family 2015-02-02 22:29:43 -08:00
.arcconfig Improve/fix bugs for the cpp linter 2014-02-13 17:48:11 -08:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Fix unity build 2015-02-03 00:32:11 -06:00
.travis.yml Don't parallelize the build in travis 2014-11-14 16:23:56 -08:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
HISTORY.md Get() to use prefix bloom filter when filter is not block based 2015-02-04 15:15:41 -08:00
INSTALL.md Optimize default compile to compilation platform by default 2014-12-15 11:29:41 +01:00
LICENSE Fix copyright year 2014-03-12 12:06:58 -07:00
Makefile Put db_test back to TESTS in Makefile 2015-02-04 16:24:52 -08:00
PATENTS
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 RocksDBLite 2014-04-15 13:39:26 -07:00
Vagrantfile Package generation for Ubuntu and CentOS 2014-09-29 16:09:46 -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/