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Snappy (compression)
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<p>Snappy (previously known as Zippy) is a fast <a href="/facts/Data_compression/gMFuY4FT">data compression</a> and <a href="/facts/Data_decompression/gMFuY4FT">decompression</a> library written in <a href="/facts/C%252B%252B/Et0F2qn9">C++</a> by Google based on ideas from <a href="/facts/LZ77/HGH09JM9">LZ77</a> and open-sourced in 2011. It does not aim for maximum compression, or compatibility with any other compression library; instead, it aims for very high speeds and reasonable compression. Compression speed is 250 <a href="/facts/MB%2fs/Nv9VoT7T">MB/s</a> and decompression speed is 500 MB/s using a single core of a circa 2011 <a href="/facts/List_of_Intel_Core_i7_microprocessors/5qT6deUr">"Westmere" 2.26 GHz Core i7</a> processor running in <a href="/facts/X86-64/cyWvUFlP">64-bit mode</a>. The <a href="/facts/Data_compression_ratio/eDEWGzTv">compression ratio</a> is 20–100% lower than <a href="/facts/Gzip/H23uqvyx">gzip</a>. </p><p>Snappy is widely used in Google projects like <a href="/facts/Bigtable/xlXLKV0t">Bigtable</a>, <a href="/facts/MapReduce/KbfxJ5vV">MapReduce</a> and in compressing data for Google's internal <a href="/facts/Remote_procedure_call/uMMb9CQw">RPC</a> systems. It can be used in open-source projects like <a href="/facts/MariaDB/QWobVFIq">MariaDB ColumnStore</a>, <a href="/facts/Apache_Cassandra/WCJyV4rA">Cassandra</a>, <a href="/facts/Couchbase_Server/zJA7EJMQ">Couchbase</a>, <a href="/facts/Hadoop/oUS1G2R7">Hadoop</a>, <a href="/facts/LevelDB/ffG5drbg">LevelDB</a>, <a href="/facts/MongoDB/9myQKGoY">MongoDB</a>, <a href="/facts/RocksDB/SveC2lEp">RocksDB</a>, <a href="/facts/Lucene/tPQ0D39Y">Lucene</a>, Spark, <a href="/facts/InfluxDB/ngtlFGSR">InfluxDB</a>, and <a href="/facts/Ceph_(software)/EU6zMFbx">Ceph</a>. <a href="/facts/Firefox/xez2zv8H">Firefox</a> uses Snappy to compress data in <a href="/facts/LocalStorage/kD85jwCw">localStorage</a>. Decompression is tested to detect any errors in the compressed stream. Snappy does not use <a href="/facts/Inline_assembler/Dn60Jm44">inline assembler</a> (except some optimizations) and is portable. </p>