A library that provides an embeddable, persistent key-value store for fast storage.
Go to file
Dhruba Borthakur d41316bc0f Prevent concurrent multiple opens of leveldb database.
Summary:
The fcntl call cannot detect lock conflicts when invoked multiple times
from the same thread.
Use a static lockedFile Set to record the paths that are locked.
A lockfile request checks to see if htis filename already exists in
lockedFiles, if so, then it triggers an error. Otherwise, it inserts
the filename in the lockedFiles Set.
A unlock file request verifies that the filename is in the lockedFiles
set and removes it from lockedFiles set.

Test Plan: unit test attached

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D4755
2012-08-24 15:18:01 -07:00
db Utility to dump manifest contents. 2012-08-24 15:17:09 -07:00
doc Added bloom filter support. 2012-04-17 08:36:46 -07:00
hdfs adding a scribe logger in leveldb to log leveldb deploy stats 2012-08-21 11:43:22 -07:00
helpers/memenv A number of fixes: 2011-10-31 17:22:06 +00:00
include/leveldb Log the open-options to the LOG. 2012-08-22 12:22:12 -07:00
port fix compile warning 2012-07-02 17:37:45 -07:00
scribe adding a scribe logger in leveldb to log leveldb deploy stats 2012-08-21 11:43:22 -07:00
snappy Checkin pre-compiled snappy libraries for leveldb. 2012-08-01 16:55:39 -07:00
table add bzip2 compression 2012-06-29 10:27:28 -07:00
thrift Expose new configration variables via the thrift api 2012-08-17 10:29:12 -07:00
tools Utility to dump manifest contents. 2012-08-24 15:17:09 -07:00
util Log the open-options to the LOG. 2012-08-22 12:22:12 -07:00
.arcconfig Support arcdiff. 2012-05-09 23:35:05 -07:00
.gitignore Added bloom filter support. 2012-04-17 08:36:46 -07:00
AUTHORS reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
build_detect_platform Record the version of the source repository that was used to build the leveldb library. 2012-08-21 14:47:15 -07:00
build_detect_version Record the version of the source repository that was used to build the leveldb library. 2012-08-21 14:47:15 -07:00
fbcode.sh adding a scribe logger in leveldb to log leveldb deploy stats 2012-08-21 11:43:22 -07:00
LICENSE reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
Makefile Prevent concurrent multiple opens of leveldb database. 2012-08-24 15:18:01 -07:00
NEWS sync with upstream @ 21409451 2011-05-21 02:17:43 +00:00
README @20776309 2011-04-20 22:48:11 +00:00
README.fb Make leveldb server not exit immediately. 2012-08-03 01:00:35 -07:00
TODO A number of smaller fixes and performance improvements: 2011-06-22 02:36:45 +00:00

leveldb: A key-value store
Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

The code under this directory implements a system for maintaining a
persistent key/value store.

See doc/index.html for more explanation.
See doc/impl.html for a brief overview of the implementation.

The public interface is in include/*.h.  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.

Guide to header files:

include/db.h
    Main interface to the DB: Start here

include/options.h
    Control over the behavior of an entire database, and also
    control over the behavior of individual reads and writes.

include/comparator.h
    Abstraction for user-specified comparison function.  If you want
    just bytewise comparison of keys, you can use the default comparator,
    but clients can write their own comparator implementations if they
    want custom ordering (e.g. to handle different character
    encodings, etc.)

include/iterator.h
    Interface for iterating over data. You can get an iterator
    from a DB object.

include/write_batch.h
    Interface for atomically applying multiple updates to a database.

include/slice.h
    A simple module for maintaining a pointer and a length into some
    other byte array.

include/status.h
    Status is returned from many of the public interfaces and is used
    to report success and various kinds of errors.

include/env.h
    Abstraction of the OS environment.  A posix implementation of
    this interface is in util/env_posix.cc

include/table.h
include/table_builder.h
    Lower-level modules that most clients probably won't use directly