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https://issues.apache.org/jira/browse/HADOOP-3333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jothi Padmanabhan updated HADOOP-3333:
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Status: Patch Available (was: Open)
New patch with the following changes:
Fixing Amar's micro review comment, corrected a couple of Java docs and
modified the taskTrackers to use a HashMap instead of TreeMap for efficiency.
> 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
> Assignee: Jothi Padmanabhan
> Priority: Blocker
> Fix For: 0.18.0
>
> Attachments: hadoop-3333-v1.patch, hadoop-3333-v2.patch,
> hadoop-3333-v3.patch, hadoop-3333.patch, HADOOP-3333_0_20080503.patch,
> HADOOP-3333_1_20080505.patch, HADOOP-3333_2_20080506.patch
>
>
> 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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