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A library that provides an embeddable, persistent key-value store for fast storage.
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Mark Callaghan c8da670325 Stop printing per-level stall times. 
Summary:
Per-level stall times are the suggested stall time, not the actual stall time so this change stops printing them
both in the per-level output lines and in the summary. Also changed output for total stall time to include units
in all cases. The new output looks like:
Level   Files   Size(MB) Score Read(GB)  Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) Comp(cnt) Avg(sec) Stall(cnt)    RecordIn   RecordDrop
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  L0     4/1          7   0.8      0.0     0.0      0.0       0.6      0.6       0.0   0.0      0.0     12.9        50       352    0.141        882            0            0
  L1     5/0          9   0.9      0.0     0.0      0.0       0.0      0.0       0.6   0.0      0.0      0.0         0         0    0.000          0            0            0
  L2    54/0         99   1.0      0.0     0.0      0.0       0.0      0.0       0.6   0.0      0.0      0.0         0         0    0.000          0            0            0
  L3   289/0        527   0.5      0.0     0.0      0.0       0.0      0.0       0.5   0.0      0.0      0.0         0         0    0.000          0            0            0
 Sum   352/1        642   0.0      0.0     0.0      0.0       0.6      0.6       1.7   1.0      0.0     12.9        50       352    0.141        882            0            0
 Int     0/0          0   0.0      0.0     0.0      0.0       0.0      0.0       0.0   1.0      0.0     15.5         0         3    0.118          7            0            0
Flush(GB): accumulative 0.627, interval 0.005
Stalls(count): 0 level0_slowdown, 0 level0_numfiles, 882 memtable_compaction, 0 leveln_slowdown_soft, 0 leveln_slowdown_hard

Task ID: #6493861

Blame Rev:

Test Plan:
run db_bench, look at output

Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D35085
2015-03-14 15:01:43 -07:00
build_tools Fix make_new_version.sh 2015-03-10 17:24:33 -07:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db Stop printing per-level stall times. 2015-03-14 15:01:43 -07:00
doc Remove seek compaction 2014-06-20 10:23:02 +02:00
examples Fix formatting 2015-02-09 09:53:30 -08:00
hdfs rocksdb: Add missing override 2015-02-26 11:28:41 -08:00
include Allow GetThreadList() to report operation stage. 2015-03-13 10:45:40 -07:00
java Merge pull request #524 from fyrz/RocksJava-Test-Fix 2015-03-13 12:45:04 +00:00
linters Return fbson 2015-02-27 00:04:14 +03:00
port RocksDB on FreeBSD support 2015-02-26 15:19:17 -08:00
table Change the way options.compression_per_level is used when options.level_compaction_dynamic_level_bytes=true 2015-03-11 13:14:52 -07:00
third-party/fbson Fix a segfault in fbson under Mac OS X compiler 2015-03-06 10:12:50 -08:00
tools Switch to use_existing_db=1 for updaterandom and mergerandom 2015-03-14 08:36:57 -07:00
util Stop printing per-level stall times. 2015-03-14 15:01:43 -07:00
utilities Provide a mechanism to inform Rocksdb that it is shutting down 2015-03-11 10:31:02 -07:00
.arcconfig build: abbreviate AR command, too 2015-02-19 11:48:09 -08:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore rocksdb: changes to support 'make analyze' in Jenkins 2015-02-23 17:45:25 -08:00
.travis.yml Upgrade compiler in Travis 2015-02-24 17:19:58 -08:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
HISTORY.md options.level_compaction_dynamic_level_bytes to allow RocksDB to pick size bases of levels dynamically. 2015-03-02 22:40:41 -08:00
INSTALL.md Optimize default compile to compilation platform by default 2014-12-15 11:29:41 +01:00
LICENSE Fix copyright year 2014-03-12 12:06:58 -07:00
Makefile EventLogger 2015-03-13 10:15:54 -07:00
PATENTS Fix the patent format 2013-10-16 15:37:32 -07:00
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 RocksDBLite 2014-04-15 13:39:26 -07:00
src.mk EventLogger 2015-03-13 10:15:54 -07:00
Vagrantfile RocksDB on FreeBSD support 2015-02-26 15:19:17 -08:00

README.md

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/