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https://issues.apache.org/jira/browse/HADOOP-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541241
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Devaraj Das commented on HADOOP-2177:
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Maybe, this is related to HADOOP-2141.
> Speculative execution does not work properly
> --------------------------------------------
>
> Key: HADOOP-2177
> URL: https://issues.apache.org/jira/browse/HADOOP-2177
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: Runping Qi
>
> One mapper of my job stuck when it reached 87.7%.
> Speculative execution was set to true.
> But no speculative execution was fired for that task.
> The whole job was stalled.
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