Attila Zsolt Piros created SPARK-26891:
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Summary: 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: 2.4.0, 2.3.0, 3.0.0
Reporter: Attila Zsolt Piros
For unrelated changes sometimes 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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