Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3587#discussion_r107445987
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/EvictingWindowOperator.java
---
@@ -122,6 +121,20 @@ public void processElement(StreamRecord<IN> element)
throws Exception {
public void merge(W
mergeResult,
Collection<W> mergedWindows, W stateWindowResult,
Collection<W> mergedStateWindows) throws Exception {
+
+ if
((windowAssigner.isEventTime() && mergeResult.maxTimestamp() <=
internalTimerService.currentWatermark())) {
+ throw
new UnsupportedOperationException("The end timestamp of an " +
+
"event-time window cannot become earlier than the current watermark " +
+
"by merging. Current watermark: " +
internalTimerService.currentWatermark() +
+
" window: " + mergeResult);
+ } else if
(!windowAssigner.isEventTime() && mergeResult.maxTimestamp() <=
internalTimerService.currentProcessingTime()) {
+ throw
new UnsupportedOperationException("The end timestamp of a " +
+
"processing-time window cannot become earlier than the current
procesing time" +
+
"by merging. Current processing time: " +
internalTimerService.currentProcessingTime() +
+
" window: " + mergeResult);
+
--- End diff --
Fixing
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