Github user aljoscha commented on the pull request: https://github.com/apache/flink/commit/6342d6db1de5f38a921732e35abd83e6c5b9305a#commitcomment-20626829 In flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/AllWindowedStream.java: In flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/AllWindowedStream.java on line 130: That's a good point but the `WindowOperator` protects against this by only considering the allowed lateness when the `WindowAssigner` advertises itself as event-time aware: https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java#L615
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