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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1366) ApplicationMasterService should Resync with the AM upon allocate call after restart
Date Tue, 20 May 2014 17:28:38 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003678#comment-14003678
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Bikas Saha commented on YARN-1366:
----------------------------------

bq.If there's no RM restart, a normal app only calling unregister without calling register
earlier will be just deemed as FINISHED ? is this acceptable?
bq.What about storing information on zk for registered application.
Catching incorrect unregistration before registration should have always been there. Is this
a regression in the patch or an existing bug. Should we consider the possibility of allowing
unregister without register? What are the downsides? As long as we can make sure that unregister
is coming from the latest version of the app.

> 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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