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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4951) Container preemption interpreted as task failure
Date Wed, 23 Jan 2013 18:23:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560903#comment-13560903
] 

Bikas Saha commented on MAPREDUCE-4951:
---------------------------------------

We might be digressing from this jira here. But I really dont think the 2-step approach is
worth its complexity. The main scenario where it makes sense is when the task has an ability
to checkpoint its work before getting preempted. I havent seen this capability outside of
basic research prototypes. Its much simpler to have the preemption be an RM only action. We
do need to fix the action and information loop so that AM's can get correct information about
the infrastructure's actions.
                
> Container preemption interpreted as task failure
> ------------------------------------------------
>
>                 Key: MAPREDUCE-4951
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4951
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mr-am, mrv2
>    Affects Versions: 2.0.2-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: MAPREDUCE-4951-1.patch, MAPREDUCE-4951-2.patch, MAPREDUCE-4951.patch
>
>
> When YARN reports a completed container to the MR AM, it always interprets it as a failure.
 This can lead to a job failing because too many of its tasks failed, when in fact they only
failed because the scheduler preempted them.
> MR needs to recognize the special exit code value of -100 and interpret it as a container
being killed instead of a container failure.

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