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From "Chen Yufei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8513) CapacityScheduler infinite loop when queue is near fully utilized
Date Wed, 15 Aug 2018 09:01:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580862#comment-16580862

Chen Yufei commented on YARN-8513:

We got infinite loops two times recently with 2.9.1, restarting ResourceManager fixed the
issue again.


As the cause of the problem is still not clear, we have upgraded to Hadoop 3.1.0. I'll give
further updates in case we encounter this issue again.

> CapacityScheduler infinite loop when queue is near fully utilized
> -----------------------------------------------------------------
>                 Key: YARN-8513
>                 URL: https://issues.apache.org/jira/browse/YARN-8513
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, yarn
>    Affects Versions: 2.9.1
>         Environment: Ubuntu 14.04.5
> YARN is configured with one label and 5 queues.
>            Reporter: Chen Yufei
>            Priority: Major
>         Attachments: jstack-1.log, jstack-2.log, jstack-3.log, jstack-4.log, jstack-5.log,
top-during-lock.log, top-when-normal.log
> ResourceManager does not respond to any request when queue is near fully utilized sometimes.
Sending SIGTERM won't stop RM, only SIGKILL can. After RM restart, it can recover running
jobs and start accepting new ones.
> Seems like CapacityScheduler is in an infinite loop printing out the following log messages
(more than 25,000 lines in a second):
> {{2018-07-10 17:16:29,227 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue:
assignedContainer queue=root usedCapacity=0.99816763 absoluteUsedCapacity=0.99816763 used=<memory:16170624,
vCores:1577> cluster=<memory:29441544, vCores:5792>}}
> {{2018-07-10 17:16:29,227 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler:
Failed to accept allocation proposal}}
> {{2018-07-10 17:16:29,227 INFO org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.AbstractContainerAllocator:
assignedContainer application attempt=appattempt_1530619767030_1652_000001 container=null
clusterResource=<memory:29441544, vCores:5792> type=NODE_LOCAL requestedPartition=}}
> I encounter this problem several times after upgrading to YARN 2.9.1, while the same configuration
works fine under version 2.7.3.
> YARN-4477 is an infinite loop bug in FairScheduler, not sure if this is a similar problem.

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