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https://issues.apache.org/jira/browse/YARN-5540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun Suresh updated YARN-5540:
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Component/s: fairscheduler
> Capacity Scheduler spends too much time looking at empty priorities
> -------------------------------------------------------------------
>
> Key: YARN-5540
> URL: https://issues.apache.org/jira/browse/YARN-5540
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacity scheduler, fairscheduler, resourcemanager
> Affects Versions: 2.7.2
> Reporter: Nathan Roberts
> Assignee: Jason Lowe
>
> We're starting to see the capacity scheduler run out of scheduling horsepower
> when running 500-1000 applications on clusters with 4K nodes or so.
> This seems to be amplified by TEZ applications. TEZ applications have many
> more priorities (sometimes in the hundreds) than typical MR applications and
> therefore the loop in the scheduler which examines every priority within
> every running application, starts to be a hotspot. The priorities appear to
> stay around forever, even when there is no remaining resource request at that
> priority causing us to spend a lot of time looking at nothing.
> jstack snippet:
> {noformat}
> "ResourceManager Event Processor" #28 prio=5 os_prio=0 tid=0x00007fc2d453e800
> nid=0x22f3 runnable [0x00007fc2a8be2000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.getResourceRequest(SchedulerApplicationAttempt.java:210)
> - eliminated <0x00000005e73e5dc0> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.assignContainers(LeafQueue.java:852)
> - locked <0x00000005e73e5dc0> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp)
> - locked <0x00000003006fcf60> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:527)
> - locked <0x00000003001b22f8> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:415)
> - locked <0x00000003001b22f8> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1224)
> - locked <0x0000000300041e40> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler)
> {noformat}
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