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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1366) AM should implement Resync with the ApplicationMasterService instead of shutting down
Date Thu, 03 Jul 2014 01:42:25 GMT

    [ https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14050975#comment-14050975
] 

Jian He commented on YARN-1366:
-------------------------------

bq. Should we make a second call to allocate (after re-registering) and then send that response
back up to the user?
Followup jira YARN-2209 will replace the resync command with a proper exception, in which
case the returned allocate response should be null.
bq. There needs to be some clear documentation
make sense, Rohith, can you add some documentation about this , thx!


> AM should implement Resync with the ApplicationMasterService instead of shutting down
> -------------------------------------------------------------------------------------
>
>                 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-1366.10.patch, YARN-1366.11.patch, YARN-1366.2.patch,
YARN-1366.3.patch, YARN-1366.4.patch, YARN-1366.5.patch, YARN-1366.6.patch, YARN-1366.7.patch,
YARN-1366.8.patch, YARN-1366.9.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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