vanzin commented on issue #23801: [SPARK-26891][YARN] Fixing flaky test in 
YarnSchedulerBackendSuite
URL: https://github.com/apache/spark/pull/23801#issuecomment-464250695
 
 
   BTW this fix would be fine too except for one issue: each instantiation of 
`YarnSchedulerBackend` is creating a single thread pool that is not shutdown 
(since the test doesn't call `YarnSchedulerBackend.stop()`), and there will be 
a task scheduled on that thread pool for the duration of the test run (you can 
see a thread leak warning in the test logs).
   
   So your fix would be fine you also fix that problem by calling stop() in the 
tests, and updating the PR description to explain the underlying problem.
   
   

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