Shobhit Dayal b45b1cde3e Feature for sampling and reporting compressibility (#4842) ... Summary: This is a feature to sample data-block compressibility and and report them as stats. 1 in N (tunable) blocks is sampled for compressibility using two algorithms: 1. lz4 or snappy for fast compression 2. zstd or zlib for slow but higher compression. The stats are reported to the caller as raw-bytes and compressed-bytes. The block continues to be compressed for storage using the specified CompressionType. The db_bench_tool how has a command line option for specifying the sampling rate. It's default value is 0 (no sampling). To test the overhead for a certain value, users can compare the performance of db_bench_tool, varying the sampling rate. It is unlikely to have a noticeable impact for high values like 20. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4842 Differential Revision: D13629011 Pulled By: shobhitdayal fbshipit-source-id: 14ca668bcab6499b2a1734edf848eb62a4f4fafa		2019-03-18 12:15:34 -07:00
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rocksdb	Feature for sampling and reporting compressibility (#4842)	2019-03-18 12:15:34 -07:00