Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/11067#discussion_r52002547 --- Diff: streaming/src/test/scala/org/apache/spark/streaming/MasterFailureTest.scala --- @@ -215,8 +216,8 @@ object MasterFailureTest extends Logging { while(!isLastOutputGenerated && !isTimedOut) { // Get the output buffer - val outputBuffer = ssc.graph.getOutputStreams().head.asInstanceOf[TestOutputStream[T]].output - def output = outputBuffer.flatMap(x => x) + val outputQueue = ssc.graph.getOutputStreams().head.asInstanceOf[TestOutputStream[T]].output + def output = outputQueue.asScala.flatMap(x => x) --- End diff -- Can the flatMap become flatten? I may be missing why
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