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https://issues.apache.org/jira/browse/HADOOP-3333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593690#action_12593690
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Arun C Murthy commented on HADOOP-3333:
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bq. Christian, do you know how many 'blacklisted' TaskTrackers were present
when you noticed this?
The reason I ask:
A TaskTracker is blacklisted once it has more than 4 failed tasks, however once
more than 25% of machines in your cluster are 'blacklisted' the blacklist is
ignored and the job is allowed to be executed anywhere to ensure it fails.
> job failing because of reassigning same tasktracker to failing tasks
> --------------------------------------------------------------------
>
> Key: HADOOP-3333
> URL: https://issues.apache.org/jira/browse/HADOOP-3333
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.16.3
> Reporter: Christian Kunz
> Priority: Blocker
>
> We have a long running a job in a 2nd atttempt. Previous job was failing and
> current jobs risks to fail as well, because reduce tasks failing on marginal
> TaskTrackers are assigned repeatedly to the same TaskTrackers (probably
> because it is the only available slot), eventually running out of attempts.
> Reduce tasks should be assigned to the same TaskTrackers at most twice, or
> TaskTrackers need to get some better smarts to find failing hardware.
> BTW, mapred.reduce.max.attempts=12, which is high, but does not help in this
> case.
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