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Yanqin Jin b512f4bc76 Batch blob read IO for MultiGet (#8699) 
Summary:
In batched `MultiGet()`, RocksDB batches blob read IO and uses `RandomAccessFileReader::MultiRead()`
to read the blobs instead of issuing multiple `Read()`.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8699

Test Plan:
```
make check
```

Reviewed By: ltamasi

Differential Revision: D31030861

Pulled By: riversand963

fbshipit-source-id: a0df6060cbfd54cff9515a4eee08807b1dbcb0c8
2021-09-17 19:23:13 -07:00
.circleci Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
.github/workflows Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
buckifier Modify script which generates TARGETS (#8366) 2021-06-04 16:28:59 -07:00
build_tools Adjust contrun name (#8924) 2021-09-16 15:06:30 -07:00
cache Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
cmake Add find_dependency() in cmake config file. (#6791) 2020-05-12 21:18:29 -07:00
coverage Remove asan_symbolize.py for internal asan build (#8737) 2021-09-07 15:39:11 -07:00
db Batch blob read IO for MultiGet (#8699) 2021-09-17 19:23:13 -07:00
db_stress_tool Avoid overwriting first non-OK Status in db_stress setup (#8907) 2021-09-15 14:28:09 -07:00
docs Fix minor typo in blog post (#8906) 2021-09-13 10:31:19 -07:00
env More robust checking of IO uring completion data (#8894) 2021-09-15 12:44:43 -07:00
examples Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
file Replace Status with IOStatus in the backupable_db (#8820) 2021-09-15 15:09:48 -07:00
fuzz Make EventListener into a Customizable Class (#8473) 2021-07-27 07:47:02 -07:00
hdfs fix build with 'USE_HDFS' on windows (#6950) 2020-06-12 16:21:50 -07:00
include/rocksdb Change SstFileMetaData::size from size_t to uint64_t (#8926) 2021-09-17 13:23:34 -07:00
java Add (& fix) some simple source code checks (#8821) 2021-09-07 21:19:27 -07:00
logging Do not attempt to rename non-existent info log (#8622) 2021-08-04 17:25:00 -07:00
memory Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
memtable Make MemTableRepFactory into a Customizable class (#8419) 2021-09-08 07:46:44 -07:00
microbench Add micro-benchmark support (#8493) 2021-07-08 18:22:45 -07:00
monitoring Added a default Name method to Statistics (#8918) 2021-09-17 07:25:43 -07:00
options Make Statistics a Customizable Class (#8637) 2021-09-10 09:47:39 -07:00
plugin Makefile support to statically link external plugin code (#7918) 2021-02-10 08:35:34 -08:00
port Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
table Batch blob read IO for MultiGet (#8699) 2021-09-17 19:23:13 -07:00
test_util Make MemTableRepFactory into a Customizable class (#8419) 2021-09-08 07:46:44 -07:00
third-party Fix a compilation error in CircleCI vs2019 CXX20 (#8090) 2021-03-23 10:28:04 -07:00
tools Fix ldb --try_load_options doesn't use customized Env (#8929) 2021-09-17 15:26:27 -07:00
trace_replay Replace std::shared_ptr<SystemClock> by SystemClock* in TraceExecutionHandler (#8729) 2021-08-31 11:24:27 -07:00
util Improve rate_limiter_test.cc (#8904) 2021-09-17 09:23:31 -07:00
utilities Implement TestFSRandomAccessFile::MultiRead() (#8925) 2021-09-16 16:01:34 -07:00
.clang-format
.gitignore gitignore cmake-build-* for CLion integration (#7933) 2021-02-19 13:43:15 -08:00
.lgtm.yml Create lgtm.yml for LGTM.com C/C++ analysis (#4058) 2018-06-26 12:43:04 -07:00
.travis.yml Move arm build from travis to circleci (#8203) 2021-04-19 20:07:02 -07:00
.watchmanconfig Added .watchmanconfig file to rocksdb repo (#5593) 2019-07-19 15:00:33 -07:00
appveyor.yml Remove 2019 from appveyor (#7038) 2020-06-29 14:31:41 -07:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Improve support for using regexes (#8740) 2021-09-07 13:05:23 -07:00
CODE_OF_CONDUCT.md Adopt Contributor Covenant 2019-08-29 23:21:01 -07:00
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
defs.bzl Make testpilot recognize that these tests have coverage instrumentation 2020-03-20 11:23:23 -07:00
DUMP_FORMAT.md
HISTORY.md Batch blob read IO for MultiGet (#8699) 2021-09-17 19:23:13 -07:00
INSTALL.md Update installation instructions (#8158) 2021-04-06 16:02:04 -07:00
issue_template.md Add Google Group to Issue Template 2020-01-28 14:40:37 -08:00
LANGUAGE-BINDINGS.md Update branch name to "main" in README/LANGUAGE_BINDINGS (#8727) 2021-09-01 15:26:34 -07:00
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 Fix and detect headers with missing dependencies (#8893) 2021-09-10 10:00:26 -07:00
PLUGINS.md Add ZenFS to plugin list (#8218) 2021-04-22 11:12:40 -07:00
README.md Update branch name to "main" in README/LANGUAGE_BINDINGS (#8727) 2021-09-01 15:26:34 -07:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
src.mk Improve support for using regexes (#8740) 2021-09-07 13:05:23 -07:00
TARGETS Improve support for using regexes (#8740) 2021-09-07 13:05:23 -07:00
thirdparty.inc Fix build jemalloc api (#5470) 2019-06-24 17:40:32 -07:00
USERS.md Add Kafka to USERS (#8911) 2021-09-14 10:26:15 -07:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md Update branch name in WINDOWS_PORT.md (#8745) 2021-09-01 19:26:39 -07:00

README.md

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

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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 especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/main/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/ and https://rocksdb.slack.com/

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.