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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
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Sandy Ryza commented on YARN-417:
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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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