Snappy (compression)
| Snappy | |
|---|---|
| Original authors | Jeff Dean, Sanjay Ghemawat, Steinar H. Gunderson |
| Developer | |
| Release | March 18, 2011 |
| Stable release | 1.1.10
/ March 9, 2023 |
| Written in | C++ |
| Operating system | Cross-platform |
| Platform | Portable |
| Size | 1.1 MiB |
| Type | data compression |
| License | Apache 2 (up to 1.0.1)/New BSD |
| Website | google |
| Repository | |
| Snappy framed | |
|---|---|
| Filename extension |
.sz |
| Internet media type |
application/x-snappy-framed |
| Magic number | ff 06 00 00 73 4e 61 50 70 59 (FF 06 00 00 "sNaPpY") |
| Type of format | Data compression |
| Open format? | yes |
| Free format? | yes |
| Website | github |
Snappy (previously known as Zippy) is a fast data compression and decompression library written in C++ by Google based on ideas from LZ77 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 MB/s and decompression speed is 500 MB/s using a single core of a circa 2011 "Westmere" 2.26 GHz Core i7 processor running in 64-bit mode. The compression ratio is 20–100% lower than gzip.
Snappy is widely used in Google projects like Bigtable, MapReduce and in compressing data for Google's internal RPC systems. It can be used in open-source projects like MariaDB ColumnStore, Cassandra, Couchbase, Hadoop, LevelDB, MongoDB, RocksDB, Lucene, Spark, Parquet, InfluxDB, and Ceph. Firefox uses Snappy to compress data in localStorage. Decompression is tested to detect any errors in the compressed stream. Snappy does not use inline assembler (except some optimizations) and is portable.