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https://issues.apache.org/jira/browse/HADOOP-3327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593734#action_12593734
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Amar Kamat commented on HADOOP-3327:
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bq. How do you know when the fetch of a map output was scheduled first?
Look for the first occurrence of '_Copying task_200804301615_0003_m_000756_0
output from_' in the reducer logs.
{quote}
Why do you even need to confirm the time for first notification?
It is obvious that the re-try/backoff strategy is flawed.
{quote}
Agreed. But the main cause of the problem needs to detected and fixed. Its just
the we should be sure that what we are fixing is really broken.
> Shufflinge fetachers waited too long between map output fetch re-tries
> ----------------------------------------------------------------------
>
> Key: HADOOP-3327
> URL: https://issues.apache.org/jira/browse/HADOOP-3327
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Runping Qi
>
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