Chris Nauroth created HDFS-5957:
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             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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