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https://issues.apache.org/jira/browse/MAPREDUCE-119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved MAPREDUCE-119.
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Resolution: Cannot Reproduce
resolving Cannot Reproduce. I haven't seen this in the wild on 0.20 ever.
> JobTracker and TaskTracker enter infinite loop when TaskTracker reports bad
> taskid
> ----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-119
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-119
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> 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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