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From "Hong Zhiguo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2323) FairShareComparator creates too much Resource object
Date Sat, 19 Jul 2014 14:23:38 GMT
Hong Zhiguo created YARN-2323:
---------------------------------

             Summary: FairShareComparator creates too much Resource object
                 Key: YARN-2323
                 URL: https://issues.apache.org/jira/browse/YARN-2323
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler
            Reporter: Hong Zhiguo
            Assignee: Hong Zhiguo
            Priority: Minor


Each call of {{FairShareComparator}} creates a new Resource object "one":
{code}
Resource one = Resources.createResource(1);
{code}

At the volume of 1000 nodes and 1000 apps, the comparator will be called more than 10 million
times per second, thus creating more than 10 million object "one", which is unnecessary.

Since the object "one" is read-only and is never referenced outside of comparator, we could
make it static.



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