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Islam AbdelRahman d52f334cbd Break stalls when no bg work is happening 
Summary:
Current stall will keep sleeping even if there is no Flush/Compactions to wait for, I changed the logic to break the stall if we are not flushing or compacting

db_bench command used
```
# fillrandom
# memtable size = 10MB
# value size = 1 MB
# num = 1000
# use /dev/shm
./db_bench --benchmarks="fillrandom,stats" --value_size=1048576 --write_buffer_size=10485760 --num=1000 --delayed_write_rate=XXXXX  --db="/dev/shm/new_stall" | grep "Cumulative stall"
```

```
Current results

# delayed_write_rate = 1000 Kb/sec
Cumulative stall: 00:00:9.031 H:M:S

# delayed_write_rate = 200 Kb/sec
Cumulative stall: 00:00:22.314 H:M:S

# delayed_write_rate = 100 Kb/sec
Cumulative stall: 00:00:42.784 H:M:S

# delayed_write_rate = 50 Kb/sec
Cumulative stall: 00:01:23.785 H:M:S

# delayed_write_rate = 25 Kb/sec
Cumulative stall: 00:02:45.702 H:M:S
```

```
New results

# delayed_write_rate = 1000 Kb/sec
Cumulative stall: 00:00:9.017 H:M:S

# delayed_write_rate = 200 Kb/sec
Cumulative stall: 00
Closes https://github.com/facebook/rocksdb/pull/1884

Differential Revision: D4585439

Pulled By: IslamAbdelRahman

fbshipit-source-id: aed2198
2017-03-16 18:24:17 -07:00
arcanist_util Fix arc setting for Facebook internal tools 2017-02-02 13:24:16 -08:00
build_tools Fix random access alignment 2017-03-08 17:09:11 -08:00
cmake/modules cmake support for linux and osx (#1358) 2016-09-28 11:53:15 -07:00
coverage Fix coverage script 2014-11-03 14:53:00 -08:00
db Break stalls when no bg work is happening 2017-03-16 18:24:17 -07:00
docs Add Bulkoading IngestExternalFile blog post 2017-03-07 18:24:10 -08:00
examples Remove skip_table_builder_flush and default it to true 2017-03-02 16:54:10 -08:00
hdfs Fix bug in UnScSigned-off-by: xh931076284 <931076284@qq.com> (#1336) 2016-09-14 10:17:34 -07:00
include/rocksdb Replace "DEPRECATED" comment to "not supported" 2017-03-16 13:54:11 -07:00
java Expose DB::DeleteRange and WriteBath::DeleteRange in Java 2017-03-06 22:24:26 -08:00
memtable Unified InlineSkipList::Insert algorithm with hinting 2016-11-22 14:09:13 -08:00
port Fix random access alignment 2017-03-08 17:09:11 -08:00
table Add macros to include file name and line number during Logging 2017-03-15 19:39:12 -07:00
third-party Kill flashcache code in RocksDB 2016-12-01 10:09:22 -08:00
tools fix db_bench rate limiter callsites 2017-03-16 17:54:12 -07:00
util Break stalls when no bg work is happening 2017-03-16 18:24:17 -07:00
utilities Add macros to include file name and line number during Logging 2017-03-15 19:39:12 -07:00
.arcconfig Make rocksdb work with internal repo 2016-10-28 14:59:50 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Less linear search in DBIter::Seek() when keys are overwritten a lot 2016-11-28 10:24:11 -08:00
.travis.yml Move db_test and external_sst_file_test out of Travis's MAC OS run 2017-03-06 09:39:15 -08:00
appveyor.yml Separate small subset tests in DBTest 2017-02-27 12:24:11 -08:00
AUTHORS Add AUTHORS file. Fix #203 2014-09-29 10:52:18 -07:00
CMakeLists.txt Refactoring 2017-03-03 18:24:12 -08:00
CONTRIBUTING.md facebook accounts are not required for CLA signers 2014-07-08 05:57:54 -04:00
DEFAULT_OPTIONS_HISTORY.md Change the default of delayed slowdown value to 16MB/s 2017-02-01 20:39:17 -08:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md update history.md for fixing the bug that skips keys 2017-03-13 11:39:13 -07:00
INSTALL.md Update static library versions and add checksums 2017-02-12 23:09:09 -08:00
LANGUAGE-BINDINGS.md Adding Dlang to the list 2017-02-16 17:24:10 -08:00
LICENSE Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
Makefile Move db_test and external_sst_file_test out of Travis's MAC OS run 2017-03-06 09:39:15 -08:00
PATENTS Update Patent Grant. 2015-04-13 10:33:43 +01:00
README.md Appveyor badge to show master branch 2016-07-26 13:54:08 -07:00
ROCKSDB_LITE.md Optimistic Transactions 2015-05-29 14:36:35 -07:00
src.mk Refactoring 2017-03-03 18:24:12 -08:00
thirdparty.inc Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
USERS.md Update USERS.md add user Pika 2017-01-25 10:39:17 -08:00
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/