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From "Chang Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-4105) Capacity Scheduler headroom for DRF is wrong
Date Wed, 02 Sep 2015 03:26:46 GMT
Chang Li created YARN-4105:

             Summary: Capacity Scheduler headroom for DRF is wrong
                 Key: YARN-4105
                 URL: https://issues.apache.org/jira/browse/YARN-4105
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Chang Li
            Assignee: Chang Li

relate to the problem discussed in YARN-1857. But the min method is flawed when we are using
DRC. Have run into a real scenario in production where queueCapacity: <memory:1056256,
vCores:3750>, qconsumed: <memory:1054720, vCores:361>, consumed: <memory:125952,
vCores:170> limit: <memory:214016, vCores:755>.  headRoom calculation returns 88064
where there is only 1536 left in the queue because DRC effectively compare by vcores. It then
caused deadlock because RMcontainer allocator thought there is still space for mapper and
won't preempt a reducer in a full queue to schedule a mapper. Propose fix with componentwiseMin.

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