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https://issues.apache.org/jira/browse/HDFS-5957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth resolved HDFS-5957.
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Resolution: Done
I'm going to go ahead and resolve this. I think we have everything we need.
[~gopalv], I can work with you offline if there are still any tuning
requirements.
Thanks for the discussion, everyone. I think this helped clarify the
implementation for everyone, and we also have a useful follow-up item in
YARN-1747 to improve container memory monitoring.
> 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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