[jira] [Created] (CASSANDRA-5863) Create a Decompressed Chunk Cache

["T Jake Luciani (JIRA)" <ji...@apache.org>]

T Jake Luciani created CASSANDRA-5863:
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             Summary: Create a Decompressed Chunk Cache
                 Key: CASSANDRA-5863
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5863
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: T Jake Luciani


Currently, for every read the CRAR we reads compressed chunks into a byte[], check sends it to ICompressor and gets back another byte[] and verifies a checksum.  

This process is where the majority of time is spent in a read request.  

Before compression we would have zero-copy of data and could respond directly from the page-cache.

It would be useful to have some kind of Chunk cache that could speed up this process for hot data. Initially this could be a off heap cache but it would be great to put these decompressed chunks onto a SSD so the hot data lives on a fast disk similar to https://github.com/facebook/flashcache.



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