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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 Mon, 19 May 2014 21:09:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002393#comment-14002393
] 

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

bq. Seems we have a race that allocate call gets the resync and do the re-register even after
the finishApplicationMaster is called. Checked the MR code that this cannot happen because
the allocate thread is interrupted and joined before calling unregister. We may document the
API say that allocate should not be called after finishApplicationMaster or handle it explicitly
in RM ?
If the AMRMClientAsync is not doing this then we should fix it.

bq.There’s a response map in AMS to differentiate the attempt, I think this should work
already.
That is for the running RM right? How does the restarted RM to do it? Currently, absence of
an entry for that AM in the responseMap is the cause for asking the AM to resync.

> 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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