rocksdb

fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

Cheng Chang 2d9efc9ab2 Cache result of GetLogicalBufferSize in Linux (#6457 ) Summary: In Linux, when reopening DB with many SST files, profiling shows that 100% system cpu time spent for a couple of seconds for `GetLogicalBufferSize`. This slows down MyRocks' recovery time when site is down. This PR introduces two new APIs: 1. `Env::RegisterDbPaths` and `Env::UnregisterDbPaths` lets `DB` tell the env when it starts or stops using its database directories . The `PosixFileSystem` takes this opportunity to set up a cache from database directories to the corresponding logical block sizes. 2. `LogicalBlockSizeCache` is defined only for OS_LINUX to cache the logical block sizes. Other modifications: 1. rename `logical buffer size` to `logical block size` to be consistent with Linux terms. 2. declare `GetLogicalBlockSize` in `PosixHelper` to expose it to `PosixFileSystem`. 3. change the functions `IOError` and `IOStatus` in `env/io_posix.h` to have external linkage since they are used in other translation units too. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6457 Test Plan: 1. A new unit test is added for `LogicalBlockSizeCache` in `env/io_posix_test.cc`. 2. A new integration test is added for `DB` operations related to the cache in `db/db_logical_block_size_cache_test.cc`. `make check` Differential Revision: D20131243 Pulled By: cheng-chang fbshipit-source-id: 3077c50f8065c0bffb544d8f49fb10bba9408d04		4 years ago
buckifier	Buck config: Re-enable liburing under Linux (#6451 )	4 years ago
build_tools	Check for sys/auxv.h (#6359 )	4 years ago
cache	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
cmake	cmake: do not build tests for Release build and cleanups (#5916 )	5 years ago
coverage	Fix interpreter lines for files with python2-only syntax.	5 years ago
db	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
db_stress_tool	support SstFileManager in db_stress (#6454 )	4 years ago
docs	Log warning for high bits/key in legacy Bloom filter (#6312 )	5 years ago
env	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
examples	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
file	Remove memcpy from RandomAccessFileReader::Read in direct IO mode (#6455 )	4 years ago
hdfs	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
include/rocksdb	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
java	When CMake fails to download a file, display the error message (#6511 )	4 years ago
logging	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
memory	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
memtable	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
monitoring	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
options	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
port	Share kPageSize (and other small tweaks) (#6443 )	4 years ago
table	Iterator with timestamp (#6255 )	4 years ago
test_util	Introduce FaultInjectionTestFS to test fault File system instead of Env (#6414 )	4 years ago
third-party	Apply formatter to some recent commits (#6138 )	5 years ago
tools	Iterator with timestamp (#6255 )	4 years ago
trace_replay	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433 )	4 years ago
util	Include more information in file lock failure (#6507 )	4 years ago
utilities	Optional sequence number exporting during checkpoint creation (#5528 )	4 years ago
.clang-format	A script that automatically reformat affected lines	11 years ago
.gitignore	Ignore compile_commands.json file (#6472 )	4 years ago
.lgtm.yml	Create lgtm.yml for LGTM.com C/C++ analysis (#4058 )	6 years ago
.travis.yml	Add ppc64le builds to Travis (#6144 )	4 years ago
.watchmanconfig	Added .watchmanconfig file to rocksdb repo (#5593 )	5 years ago
AUTHORS	Update RocksDB Authors File	7 years ago
CMakeLists.txt	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
CODE_OF_CONDUCT.md	Adopt Contributor Covenant	5 years ago
CONTRIBUTING.md	Add Code of Conduct	7 years ago
COPYING	Add GPLv2 as an alternative license.	7 years ago
DEFAULT_OPTIONS_HISTORY.md	options.delayed_write_rate use the rate of rate_limiter by default.	7 years ago
DUMP_FORMAT.md	First version of rocksdb_dump and rocksdb_undump.	9 years ago
HISTORY.md	Include more information in file lock failure (#6507 )	4 years ago
INSTALL.md	Update the version of the dependencies used by the RocksJava static build (#4761 )	6 years ago
LANGUAGE-BINDINGS.md	LANGUAGE-BINDINGS.md: mention python-rocksdb	5 years ago
LICENSE.Apache	Change RocksDB License	7 years ago
LICENSE.leveldb	Add back the LevelDB license file	7 years ago
Makefile	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
README.md	Replaced some words (#5877 )	5 years ago
ROCKSDB_LITE.md	Fix some typos in comments and docs.	6 years ago
TARGETS	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
USERS.md	add user nebula (#6271 )	5 years ago
Vagrantfile	Adding CentOS 7 Vagrantfile & build script	6 years ago
WINDOWS_PORT.md	#5145 , rename port/dirent.h to port/port_dirent.h to avoid compile err when use port dir as header dir output (#5152 )	5 years ago
appveyor.yml	Don't download from (unreliable) maven.org (#6348 )	4 years ago
defs.bzl	Add clarifying/instructive header to TARGETS and defs.bzl	5 years ago
issue_template.md	Add Google Group to Issue Template	4 years ago
src.mk	Cache result of GetLogicalBufferSize in Linux (#6457 )	4 years ago
thirdparty.inc	Fix build jemalloc api (#5470 )	5 years ago

README.md

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

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/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.