A library that provides an embeddable, persistent key-value store for fast storage.
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Tomislav Novak 5508122ed6 Fix a perf regression in ForwardIterator
Summary:
I noticed that memtable iterator usually crosses the `iterate_upper_bound`
threshold when tailing. Changes introduced in D43833 made `NeedToSeekImmutable`
always return true in such case, even when `Seek()` only needs to rewind the
memtable iterator. In a test I ran, this caused the "tailing efficiency"
(ratio of calls to `Seek()` that only affect the memtable versus all seeks)
to drop almost to zero.

This diff attempts to fix the regression by using a different flag to indicate
that `current_` is over the limit instead of resetting `valid_` in
`UpdateCurrent()`.

Test Plan: `DBTestTailingIterator.TailingIteratorUpperBound`

Reviewers: sdong, rven

Reviewed By: rven

Subscribers: dhruba, march

Differential Revision: https://reviews.facebook.net/D45909
2015-09-01 09:54:30 -07:00
arcanist_util Fix linters on non-fb machines 2015-08-11 11:36:12 -07:00
build_tools Merge branch 'arcpatch-D45741' 2015-08-31 12:42:56 -07:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db Fix a perf regression in ForwardIterator 2015-09-01 09:54:30 -07:00
doc Remove seek compaction 2014-06-20 10:23:02 +02:00
examples Fix compact_files_example 2015-08-25 12:29:44 -07:00
hdfs [Cleanup] Remove RandomRWFile 2015-08-12 10:18:59 -07:00
include/rocksdb Support static Status messages 2015-08-31 16:13:29 -07:00
java Fixed compile warning in rocksdbjava 2015-08-31 18:36:17 -07:00
port remove spurious compression definitions 2015-08-28 11:17:02 -07:00
table Add ZSTD (not final format) compression type 2015-08-28 11:01:13 -07:00
third-party "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
tools Add ZSTD (not final format) compression type 2015-08-28 11:01:13 -07:00
util Fixed a compile warning in linux32 environment. 2015-08-31 18:35:12 -07:00
utilities Support static Status messages 2015-08-31 16:13:29 -07:00
.arcconfig Integrate Jenkins with Phabricator 2015-04-07 11:56:29 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
.travis.yml Another attempt at adding the Java API and tests to the travis build 2015-07-28 11:52:11 +01:00
appveyor.yml Add auto-build manifest for appveyor 2015-08-07 15:37:46 -07:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CMakeLists.txt Support static Status messages 2015-08-31 16:13:29 -07:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Add ZSTD (not final format) compression type 2015-08-28 11:01:13 -07:00
INSTALL.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
LICENSE Fix copyright year 2014-03-12 12:06:58 -07:00
Makefile Add a 'tools' target. 2015-08-13 10:19:53 -07:00
PATENTS Update Patent Grant. 2015-04-13 10:33:43 +01:00
README.md Replaced "built on on earlier work" by "built on earlier work" in README.md 2014-09-17 01:16:17 -07:00
ROCKSDB_LITE.md Optimistic Transactions 2015-05-29 14:36:35 -07:00
src.mk Support static Status messages 2015-08-31 16:13:29 -07:00
thirdparty.inc Conditional use of third-party libraries 2015-07-09 14:42:41 -07:00
USERS.md Add Yahoo's blog post about Sherpa to USERS.md 2015-06-09 12:55:58 -07:00
Vagrantfile RocksDB on FreeBSD support 2015-02-26 15:19:17 -08:00
WINDOWS_PORT.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00

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

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/