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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-110) AM releases too many containers due to the protocol
Date Mon, 24 Sep 2012 20:36:08 GMT

     [ https://issues.apache.org/jira/browse/YARN-110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated YARN-110:
-------------------------------

    Attachment: YARN-110.patch

Simple patch to resolve the difference b/w the AM's view of the world with the RM within the
'transaction' i.e. the allocate call.

The essential idea is for the RM to account for the newly allocated containers since the last
AM heartbeat while updating #containers for * (ANY). 
                
> AM releases too many containers due to the protocol
> ---------------------------------------------------
>
>                 Key: YARN-110
>                 URL: https://issues.apache.org/jira/browse/YARN-110
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>         Attachments: YARN-110.patch
>
>
> - AM sends request asking 4 containers on host H1.
> - Asynchronously, host H1 reaches RM and gets assigned 4 containers. RM at this point,
sets the value against H1 to
> zero in its aggregate request-table for all apps.
> - In the mean-while AM gets to need 3 more containers, so a total of 7 including the
4 from previous request.
> - Today, AM sends the absolute number of 7 against H1 to RM as part of its request table.
> - RM seems to be overriding its earlier value of zero against H1 to 7 against H1. And
thus allocating 7 more
> containers.
> - AM already gets 4 in this scheduling iteration, but gets 7 more, a total of 11 instead
of the required 7.

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