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https://issues.apache.org/jira/browse/HADOOP-3130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583420#action_12583420
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Amar Kamat commented on HADOOP-3130:
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Can you check the JT and the TT logs to find out for which map TIP was the
reducer waiting for and what exactly happened to the TIP (from the JT logs).
There could be a task failure or lost TT and the TIP might have got
delayed/re-executed.
> Shuffling takes too long to get the last map output.
> ----------------------------------------------------
>
> Key: HADOOP-3130
> URL: https://issues.apache.org/jira/browse/HADOOP-3130
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Runping Qi
> Attachments: shuffling.log
>
>
> I noticed that towards the end of shufflling, the map output fetcher of the
> reducer backs off too aggressively.
> I attach a fraction of one reduce log of my job.
> Noticed that the last map output was not fetched in 2 minutes.
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