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https://issues.apache.org/jira/browse/YARN-6215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880958#comment-15880958
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Karthik Kambatla commented on YARN-6215:
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Let me see if I understand this right.
bq. At this moment, a few queues has been updated while others are not. And the
preemptionThread will try to find container to preempt in the incomplete state.
Is this because the fairshares of other queues might not be updated by then?
And, we might not find enough containers to preempt in that round.
I am a little wary of adding a readlock on the scheduler. While that might
solve this problem, it increases the lock contention.
> TestFairSchedulerPreemption.testPreemptionBetweenNonSiblingQueues fails in
> trunk
> --------------------------------------------------------------------------------
>
> Key: YARN-6215
> URL: https://issues.apache.org/jira/browse/YARN-6215
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: fairscheduler, test
> Reporter: Sunil G
> Assignee: Tao Jie
> Attachments: YARN-6215.001.patch
>
>
> *Error Message*
> Incorrect number of containers on the greedy app expected:<4> but was:<8>
> Failed test case
> [link|https://builds.apache.org/job/PreCommit-YARN-Build/15038/testReport/org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair/TestFairSchedulerPreemption/testPreemptionBetweenNonSiblingQueues_FairSharePreemptionWithDRF_/]
> *Stacktrace*
> {noformat}
> java.lang.AssertionError: Incorrect number of containers on the greedy app
> expected:<4> but was:<8>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:555)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption.verifyPreemption(TestFairSchedulerPreemption.java:282)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption.testPreemptionBetweenNonSiblingQueues(TestFairSchedulerPreemption.java:323)
> {noformat}
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