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https://issues.apache.org/jira/browse/YARN-417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594892#comment-13594892
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Bikas Saha commented on YARN-417:
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No. There is a field in the response thats currently missing from the callback
- availableResources. that should be the first callback. That show how much
spare resources are available to the app and can be used to change strategy.
eg. MR uses it to determine how many reduces it can start optimistically while
leaving enough space to complete the tail end of the map phase.
In some ways, the availableResources, completedContainers and
allocatedContainers are a unit of information. We might be making it harder to
reason about them by breaking the information into separate chunks of
onAllocated(), onCompleted() etc and providing them at different times. Of
course this matters more to sophisticated schedulers.
> 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.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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