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https://issues.apache.org/jira/browse/MAPREDUCE-3050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112665#comment-13112665
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Eric Payne commented on MAPREDUCE-3050:
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@Bobby
I have a few questions:
* SchedulerAppImpl.java: IIUC, {{getReservedContainers()}} is new. It seems to
be very similar to {{getAllReservedContainers()}}. Do we need both, and if so,
how are they different?
* YarnScheduler.java: {{getApplication()}} is @Private, but the implementaion
is public (CapacityScheduler, FifoScheduler). I thought Java complained when
you do this? Why not just make the method interface @Public?. I guess the same
question goes for {{getRootQueue()}}.
* {{getRootQueue()}}: The implementation of this method returns different types
from CapacityScheduler vs. FifoScheduler. If I only have a reference to the
YarnScheduler object (like in RMAppAttemptImpl), do I have to know whether it's
a CapacityScheduler vs. FifoScheduler if I want to call {{getRootQueue()}}?
> YarnScheduler needs to expose Resource Usage Information
> --------------------------------------------------------
>
> Key: MAPREDUCE-3050
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3050
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Blocker
> Fix For: 0.23.0, 0.24.0
>
> Attachments: MR-3050.txt
>
>
> Before the recent refactor The nodes had information in them about how much
> resources they were using. This information is not hidden inside
> SchedulerNode. Similarly resource usage information about an application, or
> in aggregate is only available through the Scheduler and there is not
> interface to pull it out.
> We need to expose APIs to get Resource and Container information from the
> scheduler, in aggregate across the entire cluster, per application, per node,
> and ideally also per queue if applicable (although there are no JIRAs I am
> aware of that need this right now).
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