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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2001) Threshold for RM to accept requests from AM after failover
Date Mon, 12 May 2014 17:54:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995326#comment-13995326
] 

Tsuyoshi OZAWA commented on YARN-2001:
--------------------------------------

[~adhoot], you're correct basically. I meant that if epoch gap between RM and NM is too large
to handle for RM, it can be killed. It saves memory usage of RM.

> Threshold for RM to accept requests from AM after failover
> ----------------------------------------------------------
>
>                 Key: YARN-2001
>                 URL: https://issues.apache.org/jira/browse/YARN-2001
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
>
> After failover, RM may require a certain threshold to determine whether it’s safe to
make scheduling decisions and start accepting new container requests from AMs. The threshold
could be a certain amount of nodes. i.e. RM waits until a certain amount of nodes joining
before accepting new container requests.  Or it could simply be a timeout, only after the
timeout RM accepts new requests. 
> NMs joined after the threshold can be treated as new NMs and instructed to kill all its
containers.



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