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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1542) Incorrect task/tip being scheduled (looks like speculative execution)
Date Fri, 29 Jun 2007 17:22:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509159
] 

Owen O'Malley commented on HADOOP-1542:
---------------------------------------

For now, I've reverted HADOOP-1440, which fixes this problem.

> Incorrect task/tip being scheduled (looks like speculative execution)
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-1542
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1542
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.14.0
>            Reporter: Nigel Daley
>            Assignee: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: jobtracker.log, namenode.log
>
>
> The change in HADOOP-1440 broke map/reduce by breaking the assumption that Task.getPartition()
corresponded to the JobInProgress.map[] order. 
> Currently JobInProgress.findNewTask uses Task.getPartition as the index of the map to
run. This can be a completely different tip, which will cause incorrect tasks to be run, including
duplicates of tasks that are already running.

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