73 lines
3.8 KiB
Markdown
73 lines
3.8 KiB
Markdown
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Snappy is a compression/decompression library. It does not aim for maximum
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compression, or compatibility with any other compression library; instead, it
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aims for very high speeds and reasonable compression. For instance, compared
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to the fastest mode of zlib, Snappy is an order of magnitude faster for most
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inputs, but the resulting compressed files are anywhere from 20% to 100%
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bigger. On a single core of a Core i7 processor in 64-bit mode, Snappy
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compresses at about 250 MB/sec or more and decompresses at about 500 MB/sec
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or more.
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Snappy is widely used inside Google, in everything from BigTable and MapReduce
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to our internal RPC systems. (Snappy has previously been referred to as "Zippy"
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in some presentations and the likes.)
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For more information, please see the [README](../README.md). Benchmarks against
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a few other compression libraries (zlib, LZO, LZF, FastLZ, and QuickLZ) are
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included in the source code distribution. The source code also contains a
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[formal format specification](../format_description.txt), as well
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as a specification for a [framing format](../framing_format.txt) useful for
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higher-level framing and encapsulation of Snappy data, e.g. for transporting
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Snappy-compressed data across HTTP in a streaming fashion. Note that the Snappy
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distribution currently has no code implementing the latter, but some of the
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ports do (see below).
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Snappy is written in C++, but C bindings are included, and several bindings to
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other languages are maintained by third parties:
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* C#: [Snappy for .NET](http://snappy4net.codeplex.com/) (P/Invoke wrapper),
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[Snappy.NET](http://snappy.angeloflogic.com/) (P/Invoke wrapper),
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[Snappy.Sharp](https://github.com/jeffesp/Snappy.Sharp) (native
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reimplementation)
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* [C port](http://github.com/andikleen/snappy-c)
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* [C++ MSVC packaging](http://snappy.angeloflogic.com/) (plus Windows binaries,
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NuGet packages and command-line tool)
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* Common Lisp: [Library bindings](http://flambard.github.com/thnappy/),
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[native reimplementation](https://github.com/brown/snappy)
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* Erlang: [esnappy](https://github.com/thekvs/esnappy),
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[snappy-erlang-nif](https://github.com/fdmanana/snappy-erlang-nif)
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* [Go](https://github.com/golang/snappy/)
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* [Haskell](http://hackage.haskell.org/package/snappy)
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* [Haxe](https://github.com/MaddinXx/hxsnappy) (C++/Neko)
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* [iOS packaging](https://github.com/ideawu/snappy-ios)
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* Java: [JNI wrapper](https://github.com/xerial/snappy-java) (including the
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framing format), [native reimplementation](http://code.google.com/p/jsnappy/),
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[other native reimplementation](https://github.com/dain/snappy) (including
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the framing format)
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* [Lua](https://github.com/forhappy/lua-snappy)
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* [Node.js](https://github.com/kesla/node-snappy) (including the [framing
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format](https://github.com/kesla/node-snappy-stream))
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* [Perl](http://search.cpan.org/dist/Compress-Snappy/)
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* [PHP](https://github.com/kjdev/php-ext-snappy)
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* [Python](http://pypi.python.org/pypi/python-snappy) (including a command-line
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tool for the framing format)
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* [R](https://github.com/lulyon/R-snappy)
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* [Ruby](https://github.com/miyucy/snappy)
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* [Rust](https://github.com/BurntSushi/rust-snappy)
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* [Smalltalk](https://github.com/mumez/sqnappy) (including the framing format)
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Snappy is used or is available as an alternative in software such as
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* [MongoDB](https://www.mongodb.com/)
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* [Cassandra](http://cassandra.apache.org/)
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* [Couchbase](http://www.couchbase.com/)
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* [Hadoop](http://hadoop.apache.org/)
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* [LessFS](http://www.lessfs.com/wordpress/)
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* [LevelDB](https://github.com/google/leveldb) (which is in turn used by
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[Google Chrome](http://chrome.google.com/))
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* [Lucene](http://lucene.apache.org/)
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* [VoltDB](http://voltdb.com/)
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If you know of more, do not hesitate to let us know. The easiest way to get in
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touch is via the
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[Snappy discussion mailing list](http://groups.google.com/group/snappy-compression).
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