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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-400) the job tracker re-runs failed tasks on the same node
Date Wed, 09 Aug 2006 13:46:16 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-400?page=all ]

Doug Cutting updated HADOOP-400:
--------------------------------

        Status: Resolved  (was: Patch Available)
    Resolution: Fixed

I just committed this.  Thanks, Owen!

> the job tracker re-runs failed tasks on the same node
> -----------------------------------------------------
>
>                 Key: HADOOP-400
>                 URL: http://issues.apache.org/jira/browse/HADOOP-400
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.4.0
>            Reporter: Owen O'Malley
>         Assigned To: Owen O'Malley
>             Fix For: 0.6.0
>
>         Attachments: task-schedule.patch
>
>
> The job tracker tries not to run tasks that have previously failed on a node on that
node again, but it doesn't strictly prevent it.
> I propose to change the rule so that when pollForNewTask is called by a TaskTracker,
the JobTracker will only assign it a task that has failed on that TaskTracker, if and only
if it has already failed on the entire cluster. Thus, for "normal" clusters with more than
4 TaskTrackers, you will be guaranteed that it will run on 4 different TaskTrackers. For small
clusters, it will run on every TaskTracker in the cluster at least once.
> Does that sound reasonable to everyone?

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