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https://issues.apache.org/jira/browse/HADOOP-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709771#action_12709771
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Vinod K V commented on HADOOP-5761:
-----------------------------------

Todd and Lance,

Which version of Hadoop are you using? HADOOP-5374 is fixed in 0.19.2 and 
above, which I think addresses the same issue that you are mentioning. Or is 
the problem that you are facing different from HADOOP-5374?

> JobTracker and TaskTracker enter infinite loop when TaskTracker reports bad 
> taskid
> ----------------------------------------------------------------------------------
>
>                 Key: HADOOP-5761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5761
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Todd Lipcon
>
> If the TaskTracker somehow gets into a state where it has a task in 
> COMMIT_PENDING state that the JobTracker does not know about, the JobTracker 
> will throw NPEs while processing heartbeats. Due to HADOOP-3987, this causes 
> the JT and TT to enter an infinite heartbeat loop with no delays, and the TT 
> fails to make progress.

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