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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1372) Ensure all completed containers are reported to the AMs across RM restart
Date Mon, 12 May 2014 17:05:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995247#comment-13995247
] 

Karthik Kambatla commented on YARN-1372:
----------------------------------------

Based on offline discussion with Anubhav, Bikas, Jian and Vinod, the control flow for notifying
the AM of finished containers should be as follows:
# NM informs RM and holds on to the information (YARN-1336 should handle this as well)
# RM informs AM
# AM acks RM
# RM acks NM
# NM deletes the information

> 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
>
> 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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