Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/15904#discussion_r91786400 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala --- @@ -184,7 +184,11 @@ class StreamingContext private[streaming] ( private[streaming] val waiter = new ContextWaiter - private[streaming] val progressListener = new StreamingJobProgressListener(this) + private[streaming] val progressListener = { + val streamingListener = new StreamingJobProgressListener(this) + sc.ui.get.setStreamingListener(streamingListener) --- End diff -- This is probably what's causing the unit test failures. The UI might not exist, which is why it's an `Option[SparkUI]` and not just a plain `SparkUI`.
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