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Haobo Xu 0f0076ed5a [RocksDB] Reduce memory footprint of the blockbased table hash index. 
Summary:
Currently, the in-memory hash index of blockbased table uses a precise hash map to track the prefix to block range mapping. In some use cases, especially when prefix itself is big, the memory overhead becomes a problem. This diff introduces a fixed hash bucket array that does not store the prefix and allows prefix collision, which is similar to the plaintable hash index, in order to reduce the memory consumption.
Just a quick draft, still testing and refining.

Test Plan: unit test and shadow testing

Reviewers: dhruba, kailiu, sdong

Reviewed By: sdong

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D19047
2014-06-18 18:16:07 -07:00
build_tools give correct metric name for grep in regression script 2014-06-10 16:32:09 -07:00
coverage
db Change order of parameters in adaptive table factory 2014-06-18 07:04:37 +02:00
doc
examples
hdfs hdfs cleanup and compile test against CDH 4.4. 2014-05-20 17:22:12 -04:00
helpers/memenv
include [RocksDB] Reduce memory footprint of the blockbased table hash index. 2014-06-18 18:16:07 -07:00
java [Java] Improve documentation for RocksEnv and its C++ resource. 2014-06-07 17:27:03 -07:00
linters
port Add separate Read/WriteUnlock methods in MutexRW. 2014-06-16 15:41:46 -07:00
table [RocksDB] Reduce memory footprint of the blockbased table hash index. 2014-06-18 18:16:07 -07:00
third-party/rapidjson Add rapidjson to RocksDB 2014-05-15 16:07:05 -07:00
tools Fix sst_dump for PlainTable 2014-06-12 11:03:03 -07:00
util HashLinkList to log distribution of number of entries aross buckets 2014-06-17 17:55:36 -07:00
utilities Remove upper bound for rate limiting unit test 2014-06-03 13:58:44 -07:00
.arcconfig
.clang-format
.gitignore Add .swp to gitignore 2014-05-16 13:17:29 -07:00
.travis.yml Turn off travis notifications 2014-05-14 16:08:02 -07:00
CONTRIBUTING.md
HISTORY.md HashLinkList to log distribution of number of entries aross buckets 2014-06-17 17:55:36 -07:00
INSTALL.md specify the command to install build_tools/mac-install-gflags.sh file in doc 2014-06-17 17:03:21 -05:00
LICENSE
Makefile Move master version to 3.2 2014-05-23 10:27:56 -07:00
PATENTS
README.md Update README.md 2014-06-13 14:11:10 -07:00
ROCKSDB_LITE.md

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 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 an 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/