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https://issues.apache.org/jira/browse/SPARK-26891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769323#comment-16769323
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Attila Zsolt Piros commented on SPARK-26891:
--------------------------------------------
I am woking on it.
> Flaky test:YarnSchedulerBackendSuite."RequestExecutors reflects node
> blacklist and is serializable"
> ---------------------------------------------------------------------------------------------------
>
> Key: SPARK-26891
> URL: https://issues.apache.org/jira/browse/SPARK-26891
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 2.3.0, 2.4.0, 3.0.0
> Reporter: Attila Zsolt Piros
> Priority: Major
>
> For even an unrelated change sometimes the
> YarnSchedulerBackendSuite#"RequestExecutors reflects node blacklist and is
> serializable" test fails with the following error:
> {noformat}
> Error Message
> org.mockito.exceptions.misusing.WrongTypeOfReturnValue: EmptySet$ cannot be
> returned by resourceOffers() resourceOffers() should return Seq *** If you're
> unsure why you're getting above error read on. Due to the nature of the
> syntax above problem might occur because: 1. This exception *might* occur in
> wrongly written multi-threaded tests. Please refer to Mockito FAQ on
> limitations of concurrency testing. 2. A spy is stubbed using
> when(spy.foo()).then() syntax. It is safer to stub spies - - with
> doReturn|Throw() family of methods. More in javadocs for Mockito.spy()
> method.
> Stacktrace
> sbt.ForkMain$ForkError:
> org.mockito.exceptions.misusing.WrongTypeOfReturnValue:
> EmptySet$ cannot be returned by resourceOffers()
> resourceOffers() should return Seq
> ***
> If you're unsure why you're getting above error read on.
> Due to the nature of the syntax above problem might occur because:
> 1. This exception *might* occur in wrongly written multi-threaded tests.
> Please refer to Mockito FAQ on limitations of concurrency testing.
> 2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub
> spies -
> - with doReturn|Throw() family of methods. More in javadocs for
> Mockito.spy() method.
> {noformat}
>
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