Github user brkyvz commented on a diff in the pull request: https://github.com/apache/spark/pull/16716#discussion_r98141759 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingQueryStatusAndProgressSuite.scala --- @@ -171,6 +174,47 @@ class StreamingQueryStatusAndProgressSuite extends StreamTest { query.stop() } } + + test("SPARK-19378: Continue reporting stateOp and eventTime metrics even if there is no data") { + import testImplicits._ + + withSQLConf(SQLConf.STREAMING_NO_DATA_PROGRESS_EVENT_INTERVAL.key -> "10") { + val inputData = MemoryStream[(Int, String)] + + val query = inputData.toDS().toDF("value", "time") + .select('value, 'time.cast("timestamp")) + .withWatermark("time", "10 seconds") + .groupBy($"value") + .agg(count("*")) + .writeStream + .queryName("metric_continuity") + .format("memory") + .outputMode("complete") + .start() + try { + inputData.addData((1, "2017-01-26 01:00:00"), (2, "2017-01-26 01:00:02")) + query.processAllAvailable() + + val progress = query.lastProgress + assert(progress.eventTime.size() > 1) + assert(progress.stateOperators.length > 0) + // Should emit new progresses every 10 ms, but we could be facing a slow Jenkins + eventually(timeout(1 minute)) { + val nextProgress = query.lastProgress + assert(nextProgress.timestamp !== progress.timestamp) + assert(nextProgress.numInputRows === 0) + assert(nextProgress.eventTime.get("min") === "2017-01-26 01:00:00") --- End diff -- Oh shoot. I should definitely leave those out because they are trigger specific right? I should only keep the stateOperator part
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