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From "Maysam Yabandeh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2430) FairShareComparator: cache the results of getResourceUsage()
Date Tue, 19 Aug 2014 01:42:18 GMT
Maysam Yabandeh created YARN-2430:

             Summary: FairShareComparator: cache the results of getResourceUsage()
                 Key: YARN-2430
                 URL: https://issues.apache.org/jira/browse/YARN-2430
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Maysam Yabandeh
            Assignee: Maysam Yabandeh

The compare of FairShareComparator has 3 invocation of  getResourceUsage per comparable object.
In the case of queues, the implementation of getResourceUsage requires iterating over the
apps and adding up their current usage. The compare method can reuse the result of getResourceUsage
to reduce the load by third. However, to further reduce the load the result of getResourceUsage
can be cached in FSLeafQueue. This would be more efficient since the invocation of compare
method on each Comparable object is >= 1.

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