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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