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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4637) Killing an unassigned task attempt causes the job to fail
Date Thu, 06 Sep 2012 10:59:08 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4637?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated MAPREDUCE-4637:
---------------------------------

    Attachment: MapReduce.png

Looking at the state transition diagrams (attached) it's possible to kill a job, task or task
attempt in any of their pre-running states: NEW, INITED/SCHEDULED/(UN)ASSIGNED. I don't see
a reason to change that since users may have a reason to kill a task attempt before it is
running. The bug here is that the unassigned state of the task attempt does not have a TA_DIAGNOSTICS_UPDATE
transition which causes the kill to fail.

I just noticed that job has a JOB_DIAGNOSTIC_UPDATE transition from both the NEW and INITED
states, so perhaps we should extend the patch to add a TA_DIAGNOSTICS_UPDATE from the NEW
state of task attempt too for completeness.
                
> Killing an unassigned task attempt causes the job to fail
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-4637
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4637
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.0-alpha
>            Reporter: Tom White
>            Assignee: Mayank Bansal
>         Attachments: MAPREDUCE-4637-trunk.patch, MAPREDUCE-4637-trunk-v2.patch, MapReduce.png
>
>
> Attempting to kill a task attempt that has been scheduled but is not running causes an
invalid state transition and the AM to stop with an error. 

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