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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5505) Clients should be notified job finished only after job successfully unregistered
Date Thu, 19 Sep 2013 20:43:53 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772291#comment-13772291
] 

Jian He commented on MAPREDUCE-5505:
------------------------------------

{code}
case REBOOT:
        if (isUnregistered && appContext.isLastAMRetry()) {
          return JobState.ERROR;
{code}
We probably don't need "appContext.isLastAMRetry()" this check here, since if this is the
last retry, the app will fail on RM side. After this AM exits, JobClient is able to query
RM for final status, in which case JobClient will be told FAILED. This is good for all transitions
to follow the same logic.

If that's the case we can create a common function to handle the logic that for every final
state, if registered return final state, otherwise return the previous state
                
> Clients should be notified job finished only after job successfully unregistered 
> ---------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5505
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5505
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5505.1.patch, MAPREDUCE-5505.1.patch
>
>
> This is to make sure user is notified job finished after job is really done. This does
increase client latency but can reduce some races during unregister like YARN-540

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