[jira] [Created] (YARN-7496) CS Intra-queue preemption user-limit calculations are not in line with LeafQueue user-limit calculations

["Eric Payne (JIRA)" <ji...@apache.org>]

Eric Payne created YARN-7496:
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             Summary: CS Intra-queue preemption user-limit calculations are not in line with LeafQueue user-limit calculations
                 Key: YARN-7496
                 URL: https://issues.apache.org/jira/browse/YARN-7496
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.8.2
            Reporter: Eric Payne
            Assignee: Eric Payne


Only a problem in 2.8.

Preemption could oscillate due to the difference in how user limit is calculated between 2.8 and later releases.

Basically (ignoring ULF, MULP, and maybe others), the calculation for user limit on the Capacity Scheduler side in 2.8 is {{total used resources / number of active users}} while the calculation in later releases is {{total active resources / number of active users}}. When intra-queue preemption was backported to 2.8, it's calculations for user limit were more aligned with the latter algorithm, which is in 2.9 and later releases.



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