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Siying Dong 92ee3350e0 BlockBasedTableIterator to keep BlockIter after out of upper bound (#4004) 
Summary:
b555ed30a4 makes the BlockBasedTableIterator to be invalidated if the current position if over the upper bound. However, this can bring performance regression to the case of multiple Seek()s hitting the same data block but all out of upper bound.

For example, if an SST file has a data block containing following keys : {a, z}

The user sets the upper bound to be "x", and it executed following queries:
Seek("b")
Seek("c")
Seek("d")

Before the upper bound optimization, these queries always come to this same current data block of the iterator, but now inside each Seek() the data block is read from the block cache but is returned again.

To prevent this regression case, we keep the current data block iterator if it is upper bound.
Closes https://github.com/facebook/rocksdb/pull/4004

Differential Revision: D8463192

Pulled By: siying

fbshipit-source-id: 8710628b30acde7063a097c3184d6c4333a8ef81
 		2018-06-19 09:57:11 -07:00
buckifier Update buckifier and TARGETS 2018-03-30 14:26:53 -07:00
build_tools Pass -latomic to linker when using clang 2018-04-25 12:13:41 -07:00
cache Fix LRUCache missing null check on destruct 2018-05-29 15:13:09 -07:00
cmake Search paths provided by intel's "tbbvars.sh". 2018-05-07 14:28:36 -07:00
coverage Suppress lint in old files 2018-01-29 12:56:42 -08:00
db BlockBasedTableIterator to keep BlockIter after out of upper bound (#4004) 2018-06-19 09:57:11 -07:00
docs Adding blog post for 5.10.2 release 2018-02-13 11:56:59 -08:00
env Build and tests fixes for Solaris Sparc (#4000) 2018-06-15 12:42:53 -07:00
examples Pinnableslice examples and blog post 2017-08-24 12:26:07 -07:00
hdfs Comment out unused variables 2018-03-05 13:13:41 -08:00
include/rocksdb Add kOptionsStatistics to GetProperty() (#3966) 2018-06-15 17:28:01 -07:00
java zLinux build error with gcc and IBM Java headers (#4013) 2018-06-18 13:58:28 -07:00
memtable Remove tests from ROCKSDB_VALGRIND_RUN 2018-05-30 16:15:16 -07:00
monitoring Build and tests fixes for Solaris Sparc (#4000) 2018-06-15 12:42:53 -07:00
options PersistRocksDBOptions() to use WritableFileWriter 2018-05-21 16:42:22 -07:00
port Fix a crash in WinEnvIO::GetSectorSize (#3975) 2018-06-12 13:45:18 -07:00
table BlockBasedTableIterator to keep BlockIter after out of upper bound (#4004) 2018-06-19 09:57:11 -07:00
third-party fix some text in comments. 2018-04-10 15:59:24 -07:00
tools Support pipelined write in stress/crash tests 2018-06-19 09:14:12 -07:00
util Build and tests fixes for Solaris Sparc (#4000) 2018-06-15 12:42:53 -07:00
utilities run make format for PR 3838 (#3954) 2018-06-05 12:58:02 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Remove leftover references to phutil_module_cache 2017-08-23 12:12:21 -07:00
.travis.yml travis: osx install zstd lz4 snappy xz (#3893) 2018-06-15 16:57:30 -07:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00
CODE_OF_CONDUCT.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
CONTRIBUTING.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
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 First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Copy Get() result when file reads use mmap 2018-06-01 16:57:58 -07:00
INSTALL.md Enable compilation on OpenBSD 2018-03-19 12:30:05 -07:00
LANGUAGE-BINDINGS.md Add Nim to the list of language bindings 2018-01-29 09:57:46 -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 Extend existing unit tests to run with WriteUnprepared as well 2018-06-01 14:58:41 -07:00
README.md Add dual-license info to README.md 2018-03-06 12:43:51 -08:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
TARGETS Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00
USERS.md Added ProfaneDB 2017-11-19 10:11:44 -08:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
appveyor.yml Upgrade Appveyor to VS2017 2018-02-01 13:57:01 -08:00
issue_template.md Add a template for issues 2017-09-29 11:41:28 -07:00
src.mk Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00
thirdparty.inc Provide a way to override windows memory allocator with jemalloc for ZSTD 2018-06-04 12:12:48 -07:00

README.md

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

Linux/Mac Build Status Windows Build status PPC64le 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/

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.