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From "Devaraj K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2237) Lost heartbeat response containing MapTask throws NPE when it is resent
Date Fri, 03 Jun 2011 10:21:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043283#comment-13043283
] 

Devaraj K commented on MAPREDUCE-2237:
--------------------------------------

These contrib test cases failures are not because of this patch.

> Lost heartbeat response containing MapTask throws NPE when it is resent
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2237
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2237
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.2, 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Devaraj K
>             Fix For: 0.20.4, 0.23.0
>
>         Attachments: MAPREDUCE-2237-0.20.patch, MAPREDUCE-2237-0.23.patch
>
>
> When the JT sends a heartbeat response, it records it in trackerToHeartbeatResponseMap.
But after MapTask writes its input split, it sets that split to null (assumedly to save memory?).
So, if the heartbeat response is lost, and the JT needs to resend it, it will throw NPE since
the split information has been lost.

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