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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-119) JobTracker and TaskTracker enter infinite loop when TaskTracker reports bad taskid
Date Thu, 11 Feb 2010 07:05:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved MAPREDUCE-119.
-----------------------------------

    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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