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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 Tue, 20 May 2014 06:27:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002858#comment-14002858
] 

Rohith 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?
No. The mutual contract that unregistration should not be called before registering (MR handles
this.MAPREDUCE-5769) but still in defensive programming this has to be handled at yarn.What
about storing information on zk for registered application.? This can be read during recovery
and move application directly to running.



> 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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