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Date: Tue, 19 Mar 2013 23:13:16 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12633758.1361645783592.15704.1363734796633@arcas>
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Subject: [jira] [Commented] (YARN-417) Add a poller that allows the AM to
 receive notifications when it is assigned containers
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    [ https://issues.apache.org/jira/browse/YARN-417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607000#comment-13607000 ] 

Sandy Ryza commented on YARN-417:
---------------------------------

That's a good point.  I'm worried about taking it in this direction, though, for reasons of future compatibility.  If we decide to later include additional information with an AMResponse, staying consistent with this approach would require us to add additional methods to the callback handler, which would break API compatibility.  I don't have a clear answer on the best way to deal with this.  One option would be to make the callback handler an abstract class and not force users to implement methods like getClusterAvailableResources.  Another would be to have a callback that returns the entire AMResponse.
                
> Add a poller that allows the AM to receive notifications when it is assigned containers
> ---------------------------------------------------------------------------------------
>
>                 Key: YARN-417
>                 URL: https://issues.apache.org/jira/browse/YARN-417
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, applications
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: AMRMClientAsync-1.java, AMRMClientAsync.java, YARN-417-1.patch, YARN-417-2.patch, YARN-417-3.patch, YARN-417-4.patch, YARN-417-4.patch, YARN-417.patch, YarnAppMaster.java, YarnAppMasterListener.java
>
>
> Writing AMs would be easier for some if they did not have to handle heartbeating to the RM on their own.

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