attilapiros opened a new pull request #23801: [SPARK-26891][YARN] Fixing flaky test YarnSchedulerBackendSuite URL: https://github.com/apache/spark/pull/23801 ## What changes were proposed in this pull request? The test "RequestExecutors reflects node blacklist and is serializable" is flaky because of multi threaded access of the mock task scheduler. For details check [Mockito FAQ (occasional exceptions like: WrongTypeOfReturnValue)](https://github.com/mockito/mockito/wiki/FAQ#is-mockito-thread-safe). So instead of mocking the task scheduler in the test TaskSchedulerImpl is simply subclassed. ## How was this patch tested? Existing unittest.
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