Varun Vasudev created YARN-2530:

             Summary: MapReduce should take cpu into account when doing 
headroom calculations
                 Key: YARN-2530
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Varun Vasudev
            Assignee: Varun Vasudev

Currently the MapReduce AM only uses memory when doing headroom calculation as 
well calculations about launching reducers. It would be preferable to account 
for CPU as well if the scheduler on the YARN side is using CPU when scheduling. 
YARN-2448 lets AMs know what resources are being considered when scheduling.

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