Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16716#discussion_r98140040
--- 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 --
This does not make sense. if there is no data in the last trigger, the min,
max, avg timestamps cannot be different.
and what about the watermark?
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