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https://issues.apache.org/jira/browse/HADOOP-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541820
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Arun C Murthy commented on HADOOP-1984:
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bq.That will allow a task tracker that is being pounded by a large cluster to
catch up before the reduce is killed.
and
bq. Ten minutes waiting interval seems too much.
are conflicting requirements, basically they depend on the job-characteristics.
To get around this, I propose we factor in the number of maps in the job into
the back-off calculations... thoughts?
> some reducer stuck at copy phase and progress extremely slowly
> --------------------------------------------------------------
>
> Key: HADOOP-1984
> URL: https://issues.apache.org/jira/browse/HADOOP-1984
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.16.0
> Reporter: Runping Qi
> Assignee: Amar Kamat
> Priority: Critical
> Fix For: 0.16.0
>
> Attachments: HADOOP-1984.patch
>
>
> In many cases, some reducers got stuck at copy phase, progressing extremely
> slowly.
> The entire cluster seems doing nothing. This causes a very bad long tails of
> otherwise well tuned map/red jobs.
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