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https://issues.apache.org/jira/browse/HADOOP-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583037#action_12583037
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Runping Qi commented on HADOOP-2933:
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They both are related to speculative execution.
> Reduce task stuck at 95.71% for a long time and the speculative execution
> does not kick in
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-2933
> URL: https://issues.apache.org/jira/browse/HADOOP-2933
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.16.0
> Reporter: Runping Qi
>
> I have a job with speculative execution set on.
> However, its last reduce task has been stuck for a long time at 95.71%, and
> no speculative execution was started.
> I did see speculative executions for other tasks started and killed though.
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