hadoop-yarn-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1372) Ensure all completed containers are reported to the AMs across RM restart
Date Fri, 01 Aug 2014 21:11:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082967#comment-14082967
] 

Jian He commented on YARN-1372:
-------------------------------

Thanks for working on this. Scan through the patch:


- If AM never pulls the containers (e.g. AM crashed), the containers will remain on NM forever
?

- NM-RM protocol changes: The patch adds a new getCleanedupContainersNotified method and some
associated event/state machine changes.Found that maybe we can just use NodeHeartbeatResponse#getContainersToCleanup
to notify NM to remove the containers from the context. the newly added getCleanedupContainersNotified()
is very similar to the getContainersToCleanup. The code path in RM seems also similar. 

> 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.prelim.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.



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message