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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2016/06/01 19:42:59 UTC

[jira] [Created] (CASSANDRA-11940) Look into better default file_cache_size for 2.2

T Jake Luciani created CASSANDRA-11940:
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             Summary: Look into better default file_cache_size for 2.2
                 Key: CASSANDRA-11940
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11940
             Project: Cassandra
          Issue Type: Improvement
            Reporter: T Jake Luciani
             Fix For: 2.2.x


CASSANDRA-8464 added support for mmapped decompression where in version <= 2.1 the reads were all decompressed in standard heap buffers.

Since the usage of the file_cache is based solely on the buffer capacity we should/can make this much larger in 2.2 when the disk access mode is mmap.  

The downside of this cache being too small is made worse by 8464 since the buffers are mmapped/unmapped causing explicit page faults.



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