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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) CapacityScheduler: Add intra-queue preemption for app priority support
Date Tue, 01 Nov 2016 20:26:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15626578#comment-15626578
] 

Jian He commented on YARN-2009:
-------------------------------

One question, not sure if this is expected. 
This code synchronize on leafQueue object, while we already changed leafQueue to use read/write
lock.  should we change to use read lock ? similar thing for the FifoCandidatesSelector. 
{code}
        synchronized (leafQueue) {
          Iterator<FiCaSchedulerApp> desc = leafQueue.getOrderingPolicy()
              .getPreemptionIterator();
          while (desc.hasNext()) {
            FiCaSchedulerApp app = desc.next();
            preemptFromLeastStarvedApp(selectedCandidates, clusterResource,
                totalPreemptedResourceAllowed, resToObtainByPartition,
                leafQueue, app);
          }
        }
{code}

> CapacityScheduler: Add intra-queue preemption for app priority support
> ----------------------------------------------------------------------
>
>                 Key: YARN-2009
>                 URL: https://issues.apache.org/jira/browse/YARN-2009
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Devaraj K
>            Assignee: Sunil G
>              Labels: oct16-medium
>             Fix For: 2.9.0
>
>         Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch, YARN-2009.0003.patch,
YARN-2009.0004.patch, YARN-2009.0005.patch, YARN-2009.0006.patch, YARN-2009.0007.patch, YARN-2009.0008.patch,
YARN-2009.0009.patch, YARN-2009.0010.patch, YARN-2009.0011.patch, YARN-2009.0012.patch, YARN-2009.0013.patch,
YARN-2009.0014.patch, YARN-2009.0015.patch, YARN-2009.0016.patch
>
>
> While preempting containers based on the queue ideal assignment, we may need to consider
preempting the low priority application containers first.



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