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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-355) RM app submission jams under load
Date Tue, 05 Feb 2013 14:59:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571362#comment-13571362
] 

Daryn Sharp commented on YARN-355:
----------------------------------

I did somewhat intentionally neglect checking the port since I was trying to post a minimal
patch, and I thought it would be extremely unlikely and not make sense for two RMs to run
on the same host.  I'll update it to check the port.
                
> RM app submission jams under load
> ---------------------------------
>
>                 Key: YARN-355
>                 URL: https://issues.apache.org/jira/browse/YARN-355
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.0.0-alpha, 0.23.6
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Blocker
>         Attachments: YARN-355.branch-23.patch, YARN-355.patch
>
>
> The RM performs a loopback connection to itself to renew its own tokens.  If app submissions
consume all RPC handlers for {{ClientRMProtocol}}, then app submissions block because it cannot
loopback to itself to do the renewal.

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