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sdong 9a8e3f73ed plain table reader: non-mmap mode to keep two recent buffers 
Summary: In plain table reader's non-mmap mode, we only keep the most recent read buffer. However, for binary search, it is likely we come back to a location to read. To avoid one pread in such a case, we keep two read buffers. It should cover most of the cases.

Test Plan:
1. run tests
2. check the optimization works through strace when running
./table_reader_bench -mmap_read=false --num_keys2=1 -num_keys1=5000 -table_factory=plain_table --iterator --through_db

Reviewers: anthony, rven, kradhakrishnan, igor, yhchiang, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D51171
 		2016-01-08 10:53:57 -08:00
arcanist_util Don't spew warnings when flint doesn't exist 2015-10-19 18:47:59 -07:00
build_tools Enhance db_bench write rate limit 2016-01-04 12:01:27 -08:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db plain table reader: non-mmap mode to keep two recent buffers 2016-01-08 10:53:57 -08:00
doc Lint everything 2015-11-16 12:56:21 -08:00
examples Fix examples 2015-12-16 17:04:46 +01:00
hdfs update posix env schedule call 2015-12-30 10:12:44 -08:00
include/rocksdb Add ColumnFamilyHandle::GetDescriptor() 2016-01-06 18:14:01 -08:00
java Fix java test buid broken by 7d87f02799 2015-12-28 11:51:39 -08:00
memtable Enable MS compiler warning c4244. 2015-12-11 16:47:34 -08:00
port Fix failing assertion in logger on Windows when the disk is full. 2016-01-05 13:35:14 +01:00
table plain table reader: non-mmap mode to keep two recent buffers 2016-01-08 10:53:57 -08:00
third-party Enable MS compiler warning c4244. 2015-12-11 16:47:34 -08:00
tools Make ldb automagically determine the file type and use the correct dumping function 2016-01-06 14:19:08 -08:00
util plain table reader: non-mmap mode to keep two recent buffers 2016-01-08 10:53:57 -08:00
utilities fix valgrind failure in backupable_db_test 2016-01-06 18:04:58 -08:00
.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 New amalgamation target 2015-10-01 08:29:31 +13:00
.travis.yml Run ROCKSDB_LITE tests in travis 2015-10-16 10:47:37 -07:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CMakeLists.txt Disable Visual Studio Warning C4351 2015-12-28 15:06:34 -08:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Make ldb automagically determine the file type and use the correct dumping function 2016-01-06 14:19:08 -08:00
INSTALL.md Update 4 is required for building with MS Visual Studio 13 2015-10-15 11:06:02 -07:00
LICENSE Fix copyright year 2014-03-12 12:06:58 -07:00
Makefile Fix clang build 2015-12-30 15:43:52 -08:00
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
USERS.md Add Airbnb and Pinterest to USERS.md 2016-01-04 11:44:55 -08:00
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
appveyor.yml Exclude DBTest.FileCreationRandomFailure as a long running test 2015-11-17 13:54:13 -08:00
src.mk support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
thirdparty.inc Enable override to 3rd party linkage 2015-11-24 11:51:37 -08:00

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/