mjsax commented on code in PR #11896:
URL: https://github.com/apache/kafka/pull/11896#discussion_r845622207
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamWindowAggregate.java:
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@@ -184,6 +247,75 @@ public void process(final Record<KIn, VIn> record) {
droppedRecordsSensor.record();
}
}
+
+ maybeMeasureLatency(() -> tryEmitFinalResult(record, closeTime),
time, emitFinalLatencySensor);
+ }
+
+ private void tryEmitFinalResult(final Record<KIn, VIn> record, final
long closeTime) {
+ if (emitStrategy.type() != StrategyType.ON_WINDOW_CLOSE) {
+ return;
+ }
+
+ final long now = internalProcessorContext.currentSystemTimeMs();
+ // Throttle emit frequency
+ if (now < timeTracker.nextTimeToEmit) {
+ return;
+ }
+
+ // Schedule next emit time based on now to avoid the case that if
system time jumps a lot,
+ // this can be triggered everytime
+ timeTracker.nextTimeToEmit = now;
+ timeTracker.advanceNextTimeToEmit();
+
+ // Close time does not progress
+ if (lastEmitCloseTime != ConsumerRecord.NO_TIMESTAMP &&
lastEmitCloseTime >= closeTime) {
+ return;
+ }
+
+ final long emitWindowStart = closeTime - windows.size();
Review Comment:
It took me some time to figure out what this variable really is. It's the
upper bound of the emit range (based on window-start) right?
Maybe we can find a better name? Maybe `emitRangeUpperBoundInclusive` ?
Similarly it might be helpful to introduce an `emitRangeLowerBoundInclusive`
variable?
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