dawidwys commented on a change in pull request #13443:
URL: https://github.com/apache/flink/pull/13443#discussion_r493757206



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/InternalTimerServiceSerializationProxy.java
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@@ -38,7 +38,7 @@
        public static final int VERSION = 2;
 
        /** The key-group timer services to write / read. */
-       private final InternalTimeServiceManager<K> timerServicesManager;
+       private final InternalTimeServiceManagerImpl<K> timerServicesManager;

Review comment:
       The thing though is, this "proxy" is used exclusively in the a private 
method of the `InternalTimerServiceManagerImpl` and is specific for that 
particular implementation. Therefore I think it is fine to use the *impl calss 
directly.




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