Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/9297#discussion_r46203496 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala --- @@ -1332,9 +1337,13 @@ object SQLContext { * Create a SQLListener then add it into SparkContext, and create an SQLTab if there is SparkUI. */ private[sql] def createListenerAndUI(sc: SparkContext): SQLListener = { - val listener = new SQLListener(sc.conf) - sc.addSparkListener(listener) - sc.ui.foreach(new SQLTab(listener, _)) - listener + if (sqlListener.get() == null) { --- End diff -- Given that it's still legal to have multiple active SQLContexts in an application (although this is not a good practice), isn't this a user-facing behavioral change? If a user creates multiple SQLContexts, then they will now only have one SQL tab in the UI and one SQLListener, which is different than the old behavior.
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