ableegoldman commented on a change in pull request #9039:
URL: https://github.com/apache/kafka/pull/9039#discussion_r465380753
##########
File path:
streams/src/test/java/org/apache/kafka/streams/integration/KStreamAggregationIntegrationTest.java
##########
@@ -459,6 +460,95 @@ public void shouldGroupByKey() throws Exception {
)));
}
+
+
+ @Test
+ public void shouldReduceSlidingWindows() throws Exception {
+ streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 0);
+ final long firstBatchTimestamp = 2000L;
+ final long timeDifference = 1000L;
+ produceMessages(firstBatchTimestamp);
+ final long secondBatchTimestamp = firstBatchTimestamp + timeDifference
/ 2;
+ produceMessages(secondBatchTimestamp);
+ final long thirdBatchTimestamp = secondBatchTimestamp + timeDifference
- 100L;
+ produceMessages(thirdBatchTimestamp);
Review comment:
Just to clarify, we don't get any additional output when the stream time
is advanced and older windows drop out of the grace period. We've already
forwarded their final state when the last record to update that window was
processed
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