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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2016/06/15 15:00:14 UTC
[jira] [Assigned] (CASSANDRA-11940) Look into better default
file_cache_size for 2.2
[ https://issues.apache.org/jira/browse/CASSANDRA-11940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
T Jake Luciani reassigned CASSANDRA-11940:
------------------------------------------
Assignee: T Jake Luciani
> 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
> Assignee: 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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