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Grace Law 1851f977c2 Added RocksDB stats GET_HIT_L0 and GET_HIT_L1 
Summary:
  - In statistics.h , added tickers.
  - In version_set.cc,
  -- Added a getter method for hit_file_level_ in the class FilePicker
  -- Added a line in the Get() method in case of a found, increment the corresponding counters based on the level of the file respectively.

Corresponding task: https://our.intern.facebook.com/intern/tasks/?s=506100481&t=5952818
Personal fork: 0c3f2e3600

Test Plan:
In terminal,
```
make -j32 db_test
ROCKSDB_TESTS=L0L1L2AndUpHitCounter ./db_test
```

Or to use debugger,
```
make -j32 db_test
export ROCKSDB_TESTS=L0L1L2AndUpHitCounter
gdb db_test
```

Reviewers: rven, sdong

Reviewed By: sdong

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D32205
2015-02-09 14:53:58 -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 Added RocksDB stats GET_HIT_L0 and GET_HIT_L1 2015-02-09 14:53:58 -08:00
doc Remove seek compaction 2014-06-20 10:23:02 +02:00
examples Fix formatting 2015-02-09 09:53:30 -08:00
hdfs Replace exception by abort() in dummy HdfsEnv implementation. 2014-12-05 13:30:57 -08:00
include Added RocksDB stats GET_HIT_L0 and GET_HIT_L1 2015-02-09 14:53:58 -08:00
java Merge pull request #483 from adamretter/restructure-java-build 2015-02-09 14:53:11 +08:00
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 Switch logv with loglevel to virtual 2015-02-09 20:59:29 +01:00
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 Merge pull request #483 from adamretter/restructure-java-build 2015-02-09 14:53:11 +08:00
.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 Switch logv with loglevel to virtual 2015-02-09 20:59:29 +01:00
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 Merge pull request #483 from adamretter/restructure-java-build 2015-02-09 14:53:11 +08:00
PATENTS Fix the patent format 2013-10-16 15:37:32 -07:00
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 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/