vanzin commented on issue #23801: [SPARK-26891][YARN] Fixing flaky test in 
YarnSchedulerBackendSuite
URL: https://github.com/apache/spark/pull/23801#issuecomment-464181429
 
 
   Yes, but that's what flaky means. It may fail or not.
   
   Your PR description doesn't explain what the problem is. It just says "multi 
threaded access" but you haven't explained how that happens - there's no multi 
threaded code in this test at all.
   
   So given that you haven't explained the problem, neither here nor in the 
bug, I was curious about how this was happening, and figured it out (see my 
explanation). Which means that the problem also exists in the other test.

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