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https://issues.apache.org/jira/browse/YARN-6215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880872#comment-15880872
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Tao Jie commented on YARN-6215:
-------------------------------
I debugged this unittest and found out it is because of reentry of updateThread
and preemptionThread.
In updateThread, it goes through all queues and trigger the preemptionThread
once it finds a app is starved. 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.
Today updateThread is under writeLock of Fairscheduler, as a result, we need
to add a readLock of FS on the preemptionThread at the same time.
> 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
>
> *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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