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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1365) ApplicationMasterService to allow Register and Unregister of an app that was running before restart
Date Tue, 10 Jun 2014 23:13:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027187#comment-14027187
] 

Bikas Saha commented on YARN-1365:
----------------------------------

Sounds like the right approach. Keeps things consistent. Allowing unregister without register
(while sounding harmless by itself) would need changes in the state machine to support and
also breaks the existing contract that even an "empty" application needs to at least call
register and unregister or its considered failed.

> ApplicationMasterService to allow Register and Unregister of an app that was running
before restart
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1365
>                 URL: https://issues.apache.org/jira/browse/YARN-1365
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-1365.001.patch, YARN-1365.002.patch, YARN-1365.003.patch, YARN-1365.004.patch,
YARN-1365.initial.patch
>
>
> For an application that was running before restart, the ApplicationMasterService currently
throws an exception when the app tries to make the initial register or final unregister call.
These should succeed and the RMApp state machine should transition to completed like normal.
Unregistration should succeed for an app that the RM considers complete since the RM may have
died after saving completion in the store but before notifying the AM that the AM is free
to exit.



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