A library that provides an embeddable, persistent key-value store for fast storage.
Go to file
sdong 27d3bc184e Use a different approach to make sure BlockBasedTableReader can use hash index on older files
Summary:
A recent commit e37dd216f9 makes sure hash index can be used when reading existing files. This patch uses another way to achieve the approach:
(1) Currently, always writing kBinarySearch to files, despite of BlockBasedTableOptions.IndexType setting.
(2) When reading a file, read out the field, and make sure it is kBinarySearch, while always use index type by users.

The reason for doing it is, to reserve kHashSearch property on disk to future. If now we write out binary index for both of kHashSearch and kBinarySearch. We have to use a new flag in the future for hash index on disk, otherwise compatibility would break. Also, we want the real index type and type shown in properties block to be consistent.

Test Plan: make all check

Reviewers: haobo, kailiu

Reviewed By: kailiu

CC: igor, ljin, yhchiang, xjin, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D18009
2014-04-18 14:09:21 -07:00
build_tools RocksDBLite 2014-04-15 13:39:26 -07:00
coverage Disable the html-based coverage report by default 2014-02-06 12:58:13 -08:00
db Fix bugs introduced by D17961 2014-04-17 17:25:28 -07:00
doc doc: table_stats_collectors -> table_properties_collectors. 2014-02-07 12:19:25 -08:00
hdfs Env to add a function to allow users to query waiting queue length 2014-03-11 10:19:02 -07:00
helpers/memenv Expose in memory Env to the world 2014-04-14 12:28:15 -07:00
include RocksDBLite 2014-04-15 13:39:26 -07:00
java Fix formatting issues 2014-04-18 10:48:48 -07:00
linters allow lambda function syntax in cpplint 2014-02-20 12:47:05 -08:00
port db_bench cleanup 2014-04-08 11:21:09 -07:00
table Use a different approach to make sure BlockBasedTableReader can use hash index on older files 2014-04-18 14:09:21 -07:00
tools Nuke tools/shell 2014-04-17 14:43:42 -07:00
util Fix ifdef NDEBUG 2014-04-17 14:29:28 -07:00
utilities RocksDBLite 2014-04-15 13:39:26 -07:00
.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 Make RocksDB compile for iOS 2014-04-04 13:11:44 -07:00
CONTRIBUTING.md Update to CONTRIBUTING.md 2014-02-20 10:55:54 -08:00
HISTORY.md Added period 2014-04-18 09:33:27 -07:00
INSTALL.md Make RocksDB compile for iOS 2014-04-04 13:11:44 -07:00
LICENSE Fix copyright year 2014-03-12 12:06:58 -07:00
Makefile Fix build 2014-04-18 10:47:03 -07:00
PATENTS Fix the patent format 2013-10-16 15:37:32 -07:00
README Add a pointer to the engineering design discussion forum. 2013-12-23 12:19:18 -08:00
README.fb update the latest version in README.fb to 2.7 2013-12-30 16:16:24 -08:00
ROCKSDB_LITE.md RocksDBLite 2014-04-15 13:39:26 -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-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.

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 and github wiki (https://github.com/facebook/rocksdb/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.

Guide to header files:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/