vanzin commented on issue #23801: [SPARK-26891][YARN] Fixing flaky test in YarnSchedulerBackendSuite URL: https://github.com/apache/spark/pull/23801#issuecomment-464247244 Actually I'm not so sure my analysis is correct either, after looking more... the ctx is running in local mode, so there's no second `CoarseGrainedSchedulerBackend` (otherwise there would be an exception when the test registered a second one). But I'm still not happy with the "this is a multi threading problem" explanation, because this test is not multi-threaded. So we should understand where the call that's causing the problem is coming from, at least.
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