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https://issues.apache.org/jira/browse/MAPREDUCE-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577284#comment-13577284
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Jason Lowe commented on MAPREDUCE-4992:
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+1 lgtm.
> AM hangs in RecoveryService when recovering tasks with speculative attempts
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-4992
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4992
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: trunk, 2.0.2-alpha, 0.23.6
> Reporter: Robert Parker
> Assignee: Robert Parker
> Priority: Critical
> Attachments: MAPREDUCE-4992v1.patch, MAPREDUCE-4992v2.patch
>
>
> A job hung in the Recovery Service on an AM restart. There were four map
> tasks events that were not processed and that prevented the complete task
> count from reaching zero which exits the recovery service. All four tasks
> were speculative
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