aljoscha commented on a change in pull request #12147:
URL: https://github.com/apache/flink/pull/12147#discussion_r425658414



##########
File path: 
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/AbstractFetcher.java
##########
@@ -202,11 +193,10 @@ protected AbstractFetcher(
                }
 
                // if we have periodic watermarks, kick off the interval 
scheduler
-               if (timestampWatermarkMode == PERIODIC_WATERMARKS) {
-                       @SuppressWarnings("unchecked")
-                       PeriodicWatermarkEmitter periodicEmitter = new 
PeriodicWatermarkEmitter(
+               if (timestampWatermarkMode == WITH_WATERMARK_GENERATOR) {
+                       PeriodicWatermarkEmitter<KPH> periodicEmitter = new 
PeriodicWatermarkEmitter<>(

Review comment:
       Yes, I'm doing the second suggestions. 👌




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