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https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14613808#comment-14613808
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Hudson commented on YARN-3508:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #246 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/246/])
YARN-3508. Prevent processing preemption events on the main RM dispatcher.
(Varun Saxena via wangda) (wangda: rev 0e4b06690ff51fbde3ab26f68fde8aeb32af69af)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/SchedulingEditPolicy.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/SchedulingMonitor.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/event/SchedulerEventType.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMDispatcher.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ContainerPreemptEvent.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/TestProportionalCapacityPreemptionPolicy.java
* hadoop-yarn-project/CHANGES.txt
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/TestProportionalCapacityPreemptionPolicyForNodePartitions.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ContainerPreemptEventType.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/ProportionalCapacityPreemptionPolicy.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java
> Prevent processing preemption events on the main RM dispatcher
> --------------------------------------------------------------
>
> Key: YARN-3508
> URL: https://issues.apache.org/jira/browse/YARN-3508
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, scheduler
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Varun Saxena
> Fix For: 2.7.2
>
> Attachments: YARN-3508-branch-2.7.01.patch, YARN-3508.002.patch,
> YARN-3508.01.patch, YARN-3508.03.patch, YARN-3508.04.patch,
> YARN-3508.05.patch, YARN-3508.06.patch
>
>
> We recently saw the RM for a large cluster lag far behind on the
> AsyncDispacher event queue. The AsyncDispatcher thread was consistently
> blocked on the highly-contended CapacityScheduler lock trying to dispatch
> preemption-related events for RMContainerPreemptEventDispatcher. Preemption
> processing should occur on the scheduler event dispatcher thread or a
> separate thread to avoid delaying the processing of other events in the
> primary dispatcher queue.
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