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https://issues.apache.org/jira/browse/HADOOP-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12712264#action_12712264
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Todd Lipcon commented on HADOOP-5761:
-------------------------------------
Lance: can you try updating to 0.19.2 on your cluster and let us know if this
problem persists?
> 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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