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Posted to hdfs-issues@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2014/09/08 22:04:29 UTC

[jira] [Resolved] (HDFS-5182) BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid

     [ https://issues.apache.org/jira/browse/HDFS-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe resolved HDFS-5182.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.6.0

> BlockReaderLocal must allow zero-copy  reads only when the DN believes it's valid
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-5182
>                 URL: https://issues.apache.org/jira/browse/HDFS-5182
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.6.0
>
>
> BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid.  This implies adding a new field to the response to REQUEST_SHORT_CIRCUIT_FDS.  We also need some kind of heartbeat from the client to the DN, so that the DN can inform the client when the mapped region is no longer locked into memory.



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