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From "Wilfred Spiegelenburg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-9173) FairShare calculation broken for large values after YARN-8833
Date Thu, 03 Jan 2019 11:23:00 GMT
Wilfred Spiegelenburg created YARN-9173:
-------------------------------------------

             Summary: FairShare calculation broken for large values after YARN-8833
                 Key: YARN-9173
                 URL: https://issues.apache.org/jira/browse/YARN-9173
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 3.3.0
            Reporter: Wilfred Spiegelenburg
            Assignee: Wilfred Spiegelenburg


After the fix for the infinite loop in YARN-8833 we now get the wrong values back for fairshare
calculations under certain circumstances. The current implementation works when the total
resource is smaller than Integer.MAXVALUE.

When the total resource goes above that value the number of iterations is not enough to converge
to the correct value.

The new test {{testResourceUsedWithWeightToResourceRatio()}} only checks that the calculation
does not hang but does not check the outcome of the calculation.




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