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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