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From "Uma Maheswara Rao G (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2378) recoverBlock timeout in DFSClient should be longer
Date Wed, 07 Dec 2011 03:11:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G resolved HDFS-2378.
---------------------------------------

    Resolution: Duplicate

Since the patch in HDFS-2637 already got +1.
After discussing with Todd, this can be duplicated. Marking it as duplicate of HDFS-2637.
                
> recoverBlock timeout in DFSClient should be longer
> --------------------------------------------------
>
>                 Key: HDFS-2378
>                 URL: https://issues.apache.org/jira/browse/HDFS-2378
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.0, 1.1.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.24.0
>
>
> In a failure scenario when one of the datanodes in a pipeline has "frozen" (eg hard swapping
or disk controller issues) we sometimes see timeouts in the call to recoverBlock(). This is
because recoverBlock's implementation sends several RPCs internally (to the NN and to other
nodes in the pipeline) with the same timeout. Since the timeouts are equal, the "outer" call
times out first. The retry then fails since recovery is already in progress, or already finished.
> The best fix would be to make recoverBlock idempotent so the retry doesn't fail, but
in the absence of that we can likely fix this issue by increasing the timeout to be equal
to the sum of the timeouts of the underlying recovery calls.

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