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