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https://issues.apache.org/jira/browse/MAPREDUCE-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777874#comment-13777874
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Tassapol Athiapinya commented on MAPREDUCE-5533:
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Should we allow some lag time before marking the history data as no-progress? I
am concerned if this method can cause many false positive speculation. Can you
please make some inputs if this is unlikely to happen?
> Speculative execution does not function for reduce
> --------------------------------------------------
>
> Key: MAPREDUCE-5533
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5533
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster
> Reporter: Tassapol Athiapinya
> Assignee: Xuan Gong
> Fix For: 2.1.1-beta
>
> Attachments: MAPREDUCE-5533.1.patch
>
>
> We have sort job where reduce attempt does not send heartbeat in timely
> manner to application master. The AM should kick off another attempt to let
> job succeeds. What we find is the job fails and there is no speculation
> happening.
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