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https://issues.apache.org/jira/browse/HADOOP-3120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-3120.
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Resolution: Incomplete
I'm going to close this as stale.
> Large #of tasks failing at one time can effectively hang the jobtracker
> ------------------------------------------------------------------------
>
> Key: HADOOP-3120
> URL: https://issues.apache.org/jira/browse/HADOOP-3120
> Project: Hadoop Common
> Issue Type: Bug
> Environment: Linux/Hadoop-15.3
> Reporter: Pete Wyckoff
> Priority: Minor
>
> We think that JobTracker.removeMarkedTaks does so much logging when this
> happens (ie logging thousands of failed taks per cycle) that nothing else can
> go on (since it's called from a synchronized method) and thus by the next
> cycle, the next waves of jobs have failed and we again have 10s of thousands
> of failures to log and on and on.
> At least, the above is what we observed - just a continual printing of those
> failures and nothing else happening on and on. Of course the original jobs
> may have ultimately failed but new jobs come in to perpetuate the problem.
> This has happened to us a number of times and since we commented out the
> log.info in that method we haven't had any problems. Although thousands and
> thousands of task failures are hopefully not that common.
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