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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2237) Lost heartbeat response containing MapTask throws NPE when it is resent
Date Tue, 04 Jan 2011 08:03:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977161#action_12977161
] 

Arun C Murthy commented on MAPREDUCE-2237:
------------------------------------------

In that case I feel better, glad to know we haven't introduced newer bugs - especially in
*that* part of the code! *smile*

> 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
>
> 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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