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Andrew Kryczka 234f33a3f9 allow nullptr Slice only as sentinel 
Summary:
Allow `Slice` holding nullptr as a sentinel value but not in comparisons. This new restriction eliminates the need for the manual checks in 39ef900551, while still conforming to glibc's `memcmp` API. Thanks siying for the idea. Users may need to migrate, so mentioned it in HISTORY.md.
Closes https://github.com/facebook/rocksdb/pull/2777

Differential Revision: D5686016

Pulled By: ajkr

fbshipit-source-id: 03a2ca3fd9a0ebade9d0d5686c81d59a9534f563
2017-08-23 10:56:06 -07:00
buckifier rocksdb: make buildable on aarch64 2017-08-13 17:13:54 -07:00
build_tools Update RocksDBCommonHelper to use escapeshellarg 2017-08-15 06:56:31 -07:00
cache Circumvent ASAN false positive 2017-08-21 12:10:43 -07:00
cmake/modules cmake: support more compression type 2017-08-13 21:47:45 -07:00
coverage Fix /bin/bash shebangs 2017-08-03 15:56:46 -07:00
db add counter for deletion dropping optimization 2017-08-19 14:10:08 -07:00
docs 5.6.1 release blog post 2017-07-25 12:27:22 -07:00
env Introduce bottom-pri thread pool for large universal compactions 2017-08-03 15:43:29 -07:00
examples Replace dynamic_cast<> 2017-07-28 16:27:16 -07:00
hdfs Revert "comment out unused parameters" 2017-07-21 18:26:26 -07:00
include/rocksdb allow nullptr Slice only as sentinel 2017-08-23 10:56:06 -07:00
java Provide byte[] version of SstFileWriter.merge to reduce GC Stall 2017-08-22 12:55:24 -07:00
memtable Introduce bottom-pri thread pool for large universal compactions 2017-08-03 15:43:29 -07:00
monitoring Scale histogram bucket size by constant factor 2017-08-21 17:10:40 -07:00
options fix some misspellings 2017-08-16 21:57:20 -07:00
port fix WinEnv assertions 2017-08-08 17:20:52 -07:00
table allow nullptr Slice only as sentinel 2017-08-23 10:56:06 -07:00
third-party Revert "comment out unused parameters" 2017-07-21 18:26:26 -07:00
tools fix db_stress uint64_t to int32 cast 2017-08-17 17:56:55 -07:00
util Support prefetch last 512KB with direct I/O in block based file reader 2017-08-11 12:16:45 -07:00
utilities allow nullptr Slice only as sentinel 2017-08-23 10:56:06 -07:00
.clang-format
.gitignore Simple blob file dumper 2017-05-23 10:42:59 -07:00
.travis.yml Build fewer tests in Travis platform_dependent tests 2017-07-27 17:29:01 -07:00
appveyor.yml Rework test running script. 2017-04-05 11:39:20 -07:00
AUTHORS
CMakeLists.txt CMake improvements 2017-08-21 14:56:50 -07:00
CONTRIBUTING.md Remove the licensing description in CONTRIBUTING.md 2017-07-16 15:57:18 -07:00
COPYING Add GPLv2 as an alternative license. 2017-04-27 18:06:12 -07:00
DEFAULT_OPTIONS_HISTORY.md options.delayed_write_rate use the rate of rate_limiter by default. 2017-05-24 09:58:24 -07:00
DUMP_FORMAT.md
HISTORY.md allow nullptr Slice only as sentinel 2017-08-23 10:56:06 -07:00
INSTALL.md add vcpkg as an windows option 2017-07-24 15:12:45 -07:00
LANGUAGE-BINDINGS.md Adding Dlang to the list 2017-02-16 17:24:10 -08:00
LICENSE.Apache Change RocksDB License 2017-07-15 16:11:23 -07:00
LICENSE.leveldb Add back the LevelDB license file 2017-07-16 18:42:18 -07:00
Makefile Overload new[] to properly align LRUCacheShard 2017-08-14 14:41:56 -07:00
README.md Appveyor badge to show master branch 2016-07-26 13:54:08 -07:00
ROCKSDB_LITE.md
src.mk Refactor PessimisticTransaction 2017-08-07 16:12:29 -07:00
TARGETS rocksdb: make buildable on aarch64 2017-08-13 17:13:54 -07:00
thirdparty.inc Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
USERS.md Update USERS.md 2017-08-06 12:44:40 -07:00
Vagrantfile Update Vagrant file (test internal phabricator workflow) 2016-10-28 15:39:19 -07:00
WINDOWS_PORT.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00

README.md

RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

Build Status 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/