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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5957) Provide support for different mmap cache retention policies in ShortCircuitCache.
Date Sat, 15 Feb 2014 22:07:19 GMT
Chris Nauroth created HDFS-5957:
-----------------------------------

             Summary: Provide support for different mmap cache retention policies in ShortCircuitCache.
                 Key: HDFS-5957
                 URL: https://issues.apache.org/jira/browse/HDFS-5957
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 2.3.0
            Reporter: Chris Nauroth


Currently, the {{ShortCircuitCache}} retains {{mmap}} regions for reuse by multiple reads
of the same block or by multiple threads.  The eventual {{munmap}} executes on a background
thread after an expiration period.  Some client usage patterns would prefer strict bounds
on this cache and deterministic cleanup by calling {{munmap}}.  This issue proposes additional
support for different caching policies that better fit these usage patterns.



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