Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/20223#discussion_r161006918
--- Diff:
core/src/test/java/org/apache/spark/launcher/SparkLauncherSuite.java ---
@@ -137,7 +139,9 @@ public void testInProcessLauncher() throws Exception {
// 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.
--- End diff --
Here Vanzin is waiting for the active SparkContext being empty.
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