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https://issues.apache.org/jira/browse/YARN-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14134762#comment-14134762
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Anubhav Dhoot commented on YARN-1372:
-------------------------------------
A finishedContainer that was sent to previous AM will have to be sent again to
the new AM inorder to get the ack. So we need to transfer the
finishedContainersSentToAM from previous attempt to the justFinishedContainers
of the new attempt (if we decide to transfer those). Then why not also transfer
the justFinishedContainers as well? If we are going to not consider whether
work-preserving AM restart is enabled for this, we should be consistent whether
we transfer justFinishedContainers and finishedContainersSentToAM (either both
or none). Agree?
> Ensure all completed containers are reported to the AMs across RM restart
> -------------------------------------------------------------------------
>
> Key: YARN-1372
> URL: https://issues.apache.org/jira/browse/YARN-1372
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Bikas Saha
> Assignee: Anubhav Dhoot
> Attachments: YARN-1372.001.patch, YARN-1372.001.patch,
> YARN-1372.002_NMHandlesCompletedApp.patch,
> YARN-1372.002_RMHandlesCompletedApp.patch,
> YARN-1372.002_RMHandlesCompletedApp.patch, YARN-1372.003.patch,
> YARN-1372.004.patch, YARN-1372.005.patch, YARN-1372.005.patch,
> YARN-1372.prelim.patch, YARN-1372.prelim2.patch
>
>
> Currently the NM informs the RM about completed containers and then removes
> those containers from the RM notification list. The RM passes on that
> completed container information to the AM and the AM pulls this data. If the
> RM dies before the AM pulls this data then the AM may not be able to get this
> information again. To fix this, NM should maintain a separate list of such
> completed container notifications sent to the RM. After the AM has pulled the
> containers from the RM then the RM will inform the NM about it and the NM can
> remove the completed container from the new list. Upon re-register with the
> RM (after RM restart) the NM should send the entire list of completed
> containers to the RM along with any other containers that completed while the
> RM was dead. This ensures that the RM can inform the AM's about all completed
> containers. Some container completions may be reported more than once since
> the AM may have pulled the container but the RM may die before notifying the
> NM about the pull.
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