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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1366) ApplicationMasterService should Resync with the AM upon allocate call after restart
Date Thu, 22 May 2014 12:24:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005863#comment-14005863
] 

Rohith commented on YARN-1366:
------------------------------

bq. I mean what will go wrong is we allow unregister without register? Is it fundamentally
wrong?
Allowing unregister without register, move application to FINISHED state(after handling unregistered
event at launched) which supposed to be Failed state. If it can be acceptable, then its fine
to go ahead.

> ApplicationMasterService should Resync with the AM upon allocate call after restart
> -----------------------------------------------------------------------------------
>
>                 Key: YARN-1366
>                 URL: https://issues.apache.org/jira/browse/YARN-1366
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Rohith
>         Attachments: YARN-1366.1.patch, YARN-1366.2.patch, YARN-1366.patch, YARN-1366.prototype.patch,
YARN-1366.prototype.patch
>
>
> The ApplicationMasterService currently sends a resync response to which the AM responds
by shutting down. The AM behavior is expected to change to calling resyncing with the RM.
Resync means resetting the allocate RPC sequence number to 0 and the AM should send its entire
outstanding request to the RM. Note that if the AM is making its first allocate call to the
RM then things should proceed like normal without needing a resync. The RM will return all
containers that have completed since the RM last synced with the AM. Some container completions
may be reported more than once.



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