Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/20221#discussion_r160719518 --- Diff: core/src/test/java/org/apache/spark/launcher/SparkLauncherSuite.java --- @@ -133,6 +134,10 @@ public void testInProcessLauncher() throws Exception { p.put(e.getKey(), e.getValue()); } System.setProperties(p); + // Here DAGScheduler is stopped, while SparkContext.clearActiveContext may not be called yet. + // Wait for a reasonable amount of time to avoid creating two active SparkContext in JVM. + // See SPARK-23019 and SparkContext.stop() for details. + TimeUnit.MILLISECONDS.sleep(500); --- End diff -- Yep, either way should work. Using `TimeUnit` is just following `BaseSuite.java`.
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