Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3412#discussion_r102939631
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/AbstractStreamOperator.java
---
@@ -887,6 +864,30 @@ public void close() {
// Watermark handling
//
------------------------------------------------------------------------
+ public <K> void
registerWatermarkCallback(KeyRegistry.OnWatermarkCallback<K> callback,
TypeSerializer<K> keySerializer) {
--- End diff --
The key serialiser can be retrieved from
`getKeyedStateBackend().getKeySerializer()`.
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