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Date: Wed, 7 Aug 2013 18:10:53 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12661398.1375449071959.17727.1375899053819@arcas>
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References: <JIRA.12661398.1375449071959@arcas>
Subject: [jira] [Commented] (YARN-1018) prereq check for
 AMRMClient.ContainerRequest relaxLocality flag wrong
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    [ https://issues.apache.org/jira/browse/YARN-1018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13732244#comment-13732244 ] 

Sandy Ryza commented on YARN-1018:
----------------------------------

If I understand correctly, you're saying that someone might want to colocate containers with other containers that have already been scheduled, so the first can be anywhere, and the later ones need to be strictly on the same node(s) as the first.  While this is a situation that we should support, it seems to me that it should require the special handling that you're suggesting.  By the semantics of relaxLocality, the first request is expected to behave semantically differently than the ones that will come after it.  It is not a strictly local request, so setting the relaxLocality flag to false on it doesn't make sense.

                
> prereq check for AMRMClient.ContainerRequest relaxLocality flag wrong
> ---------------------------------------------------------------------
>
>                 Key: YARN-1018
>                 URL: https://issues.apache.org/jira/browse/YARN-1018
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.1.0-beta
>            Reporter: Steve Loughran
>            Priority: Minor
>
> Trying to create a container request with no racks/nodes and no relaxed priority fails
> {code}
> new AMRMClient.ContainerRequest(capability, null, null, 0, false);
> {code}
> expected: a container request.
> actual: stack trace saying I can't relax node locality.

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