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https://issues.apache.org/jira/browse/MAPREDUCE-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065309#comment-14065309
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Jian He commented on MAPREDUCE-5910:
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committing this.
> MRAppMaster should handle Resync from RM instead of shutting down.
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-5910
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5910
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Components: applicationmaster
> Reporter: Rohith
> Assignee: Rohith
> Attachments: MAPREDUCE-5910.1.patch, MAPREDUCE-5910.2.patch,
> MAPREDUCE-5910.3.patch, MAPREDUCE-5910.4.patch
>
>
> The ApplicationMasterService currently sends a resync response to which the
> AM responds by shutting down. The MRAppMaster 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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