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From "zhangshilong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-5969) FairShareComparator getResourceUsage pool performance
Date Tue, 06 Dec 2016 03:49:58 GMT
zhangshilong created YARN-5969:

             Summary: FairShareComparator getResourceUsage pool performance
                 Key: YARN-5969
                 URL: https://issues.apache.org/jira/browse/YARN-5969
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler
    Affects Versions: 2.7.1
            Reporter: zhangshilong

in FairShareComparator.java, the performance of function getResourceUsage()  is very pool.
It will be executed above 100,000,000 times per second.
In our scene, It  takes 20 seconds per minute.  
A simple solution is to reduce call counts  of the function.

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