Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/2093#discussion_r66794085
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperator.java
---
@@ -551,19 +657,28 @@ public void registerProcessingTimeTimer(long time) {
}
}
+ void registerCleanupTimer(long time) {
--- End diff --
The logic for these two (`register/deleteCleanupTimer`) should be moved
directly into `WindowOperator`.
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