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Date: Mon, 8 Sep 2014 20:04:29 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12667954.1378857814000.19800.1410206669623@Atlassian.JIRA>
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 <JIRA.12667954.1378857814548@arcas>
Subject: [jira] [Resolved] (HDFS-5182) BlockReaderLocal must allow zero-copy
  reads only when the DN believes it's valid
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     [ 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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