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From "Tao Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-8945) Calculation of Maximum applications should respect specified and global maximum applications for absolute resource
Date Fri, 26 Oct 2018 02:18:00 GMT
Tao Yang created YARN-8945:
------------------------------

             Summary: Calculation of Maximum applications should respect specified and global
maximum applications for absolute resource
                 Key: YARN-8945
                 URL: https://issues.apache.org/jira/browse/YARN-8945
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 3.2.0
            Reporter: Tao Yang
            Assignee: Tao Yang


Currently maximum applications is expected to be calculated as follow according to priority
when using percentage based capacity:
(1) equals specified maximum applications for queues
(2) equals global maximum applications
(3) calculated as queue-capacity * maximum-system-applications
But for absolute resource configuration, maximum applications is calculated as (3) in ParentQueue#deriveCapacityFromAbsoluteConfigurations,
this is a strict limit for high max-capacity and low capacity queues which have little guaranteed
resources but want to use lots of share resources. So I propose to share the maximum applications
calculation of percentage based capacity, absolute resource can call the same calculation
if necessary.



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