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https://issues.apache.org/jira/browse/YARN-4125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14734168#comment-14734168
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Raymond Liu commented on YARN-4125:
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[~ka...@cloudera.com] regarding provide the information about largest container
allocatable. how would you decide the value?
say if the <memory, cpu> capability is:
<4096, 0>
<3172, 1>
<2048, 2>
<1024, 3>
<0, 4>
which one will be the largest container allocatable?
> In addition to aggregate availability for an app, headroom should provide
> information on largest container that can be allcoated
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-4125
> URL: https://issues.apache.org/jira/browse/YARN-4125
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: scheduler
> Affects Versions: 2.7.1
> Reporter: Karthik Kambatla
>
> Today, headroom is an indicator to an application on the resources available
> to it. It is an aggregate across all nodes. If all the nodes have either only
> memory or only cpu available, no container can be allocated. The headroom
> should hint at this too, so apps can make decisions sooner. MAPREDUCE-6470 is
> a case of this, and has an example for the curious.
> May be, we should add an API that returns both aggregate headroom and large
> container allocatable.
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