Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/14079#discussion_r92229579 --- Diff: core/src/test/scala/org/apache/spark/scheduler/SchedulerIntegrationSuite.scala --- @@ -157,8 +160,16 @@ abstract class SchedulerIntegrationSuite[T <: MockBackend: ClassTag] extends Spa } // When a job fails, we terminate before waiting for all the task end events to come in, // so there might still be a running task set. So we only check these conditions - // when the job succeeds - assert(taskScheduler.runningTaskSets.isEmpty) + // when the job succeeds. + // When the final task of a taskset completes, we post + // the event to the DAGScheduler event loop before we finish processing in the taskscheduler + // thread. Its possible the DAGScheduler thread processes the event, finishes the job, + // and notifies the job waiter before our original thread in the task scheduler finishes + // handling the event and marks the taskset as complete. So its ok if we need to wait a + // *little* bit longer for the original taskscheduler thread to finish up to deal w/ the race. + eventually(timeout(1 second), interval(100 millis)) { + assert(taskScheduler.runningTaskSets.isEmpty) --- End diff -- no, just that one of test runs failed because of this https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/68694/consoleFull so I included the fix here in case there was more flakiness. But actually I dont' think I've seen this failure any other time, so I can move it out to a separate fix.
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