A library that provides an embeddable, persistent key-value store for fast storage.
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Mayank Agarwal dad2731729 Fix bug in KeyMayExist
Summary: In KeyMayExist.db_test we do a Flush which causes sst file to be written and added as open file in TableCache, but block cache for the file is not populated. So value_found should have been false where it was true and KeyMayExist.db_test should not have passed earlier. But it passed because BlockReader in table/table.cc takes 2 default arguments at the end called for_compaction and no_io. Although I passed no_io=true from InternalGet to BlockReader, but it understood for_compaction=true and defaulted no_io to false. This is a bug and although will be removed by Dhruba's new patch to incorporate no_io in readoptions, I'm submitting this patch to fix this bug independently of that patch.

Test Plan: make all check

Reviewers: dhruba, haobo

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D12537
2013-08-26 08:45:58 -07:00
build_tools Do not use relative paths in build system 2013-08-22 14:53:51 -07:00
coverage Fix the gcov/lcov related issues 2013-08-22 17:01:06 -07:00
db Fix bug in KeyMayExist 2013-08-26 08:45:58 -07:00
doc merge 1.5 2012-08-28 11:43:33 -07:00
hdfs Replace include/leveldb with include/rocksdb. 2013-08-23 10:51:00 -07:00
helpers/memenv Replace include/leveldb with include/rocksdb. 2013-08-23 10:51:00 -07:00
include Fix memory leak 2013-08-23 15:39:49 -07:00
java Pom changes to make relase 1.5.7 for java. 2013-01-10 10:43:43 -08:00
linters/src fixing linters. 2012-12-14 14:05:27 -08:00
port Replace include/leveldb with include/rocksdb. 2013-08-23 10:51:00 -07:00
scribe fix db_test error with scribe logger turned on 2012-08-28 11:22:58 -07:00
snappy Build with gcc-4.7.1-glibc-2.14.1. 2012-09-17 10:56:26 -07:00
table Fix bug in KeyMayExist 2013-08-26 08:45:58 -07:00
thrift Implement RowLocks for assoc schema 2012-10-03 23:19:01 -07:00
tools Replace include/leveldb with include/rocksdb. 2013-08-23 10:51:00 -07:00
util Fix memory leak 2013-08-23 15:39:49 -07:00
utilities Replace include/leveldb with include/rocksdb. 2013-08-23 10:51:00 -07:00
.arcconfig Enable linting in arc. 2013-02-01 11:34:25 -08:00
.gitignore Clean up the Makefile and the build scripts 2013-08-15 12:59:45 -07:00
LICENSE reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
Makefile Fix the gcov/lcov related issues 2013-08-22 17:01:06 -07:00
README Fix README contents. 2013-07-30 08:30:13 -07:00
README.fb Updating readme to 2.1 2013-08-06 14:43:16 -07:00

rocksdb: A persistent key-value store for flash storage
Authors: * The Facebook Database Engineering Team
         * Build 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-Stuctured-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.

The core of this code has been derived from open-source leveldb.

The code under this directory implements a system for maintaining a
persistent key/value store.

See doc/index.html for more explanation.
See doc/impl.html for a brief overview of the implementation.

The public interface is in include/*.h.  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.

Guide to header files:

include/db.h
    Main interface to the DB: Start here

include/options.h
    Control over the behavior of an entire database, and also
    control over the behavior of individual reads and writes.

include/comparator.h
    Abstraction for user-specified comparison function.  If you want
    just bytewise comparison of keys, you can use the default comparator,
    but clients can write their own comparator implementations if they
    want custom ordering (e.g. to handle different character
    encodings, etc.)

include/iterator.h
    Interface for iterating over data. You can get an iterator
    from a DB object.

include/write_batch.h
    Interface for atomically applying multiple updates to a database.

include/slice.h
    A simple module for maintaining a pointer and a length into some
    other byte array.

include/status.h
    Status is returned from many of the public interfaces and is used
    to report success and various kinds of errors.

include/env.h
    Abstraction of the OS environment.  A posix implementation of
    this interface is in util/env_posix.cc

include/table_builder.h
    Lower-level modules that most clients probably won't use directly

include/cache.h
    An API for the block cache.

include/compaction_filter.h
    An API for a application filter invoked on every compaction.

include/filter_policy.h
    An API for configuring a bloom filter.

include/memtablerep.h
    An API for implementing a memtable.

include/statistics.h
    An API to retrieve various database statistics.

include/transaction_log_iterator.h
    An API to retrieve transaction logs from a database.