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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 Fri, 16 May 2014 20:45:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000284#comment-14000284
] 

Bikas Saha commented on YARN-1366:
----------------------------------

bq. Seems like we are going with no resync api for now as per the current patch. I think its
a good idea to hold of on the new API unless we see a need. I feel there isnt a strong case
for it yet.
I dont think we can summarily make such a choice without a proper discussion. Again, I am
not advocating either choice. But we should understand the approaches and their effects on
the system (users + back-end implementation) before we make a call on the API. My last comment
opened the discussion with some questions and it would be great if the assignee ([~rohithsharma]
and other committers/contributors express their understanding and insight on those questions.

> 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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