A library that provides an embeddable, persistent key-value store for fast storage.
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Xing Jin 42c109cc2e New ldb command to convert compaction style
Summary:
Add new command "change_compaction_style" to ldb tool. For
universal->level, it shows "nothing to do". For level->universal, it
compacts all files into a single one and moves the file to level 0.

Also add check for number of files at level 1+ when opening db with
universal compaction style.

Test Plan:
'make all check'. New unit test for internal convertion function. Also manully test various
cmd like:

./ldb change_compaction_style --old_compaction_style=0
--new_compaction_style=1 --db=/tmp/leveldbtest-3088/db_test

Reviewers: haobo, dhruba

Reviewed By: haobo

CC: vamsi, emayanke

Differential Revision: https://reviews.facebook.net/D12603
2013-09-04 13:13:08 -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 New ldb command to convert compaction style 2013-09-04 13:13:08 -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 New ldb command to convert compaction style 2013-09-04 13:13:08 -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 memory leak in table.cc 2013-09-02 22:13:29 -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 New ldb command to convert compaction style 2013-09-04 13:13:08 -07:00
utilities New ldb command to convert compaction style 2013-09-04 13:13:08 -07:00
.arcconfig Enable linting in arc. 2013-02-01 11:34:25 -08:00
.gitignore Introduced a new flag non_blocking_io in ReadOptions. 2013-08-28 10:49:14 -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.