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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3333) job failing because of reassigning same tasktracker to failing tasks
Date Mon, 05 May 2008 22:55:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594379#action_12594379
] 

Christian Kunz commented on HADOOP-3333:
----------------------------------------

This is a good enough work-around, i.e. it is okay with me to wait for 0.18.0 with the official
fix

BTW, just for the record, the tasktracker's  were not actually bouncing as in restarting,
but they got lost and rejoined.

> 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: Arun C Murthy
>            Priority: Critical
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3333_0_20080503.patch, HADOOP-3333_1_20080505.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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