pnowojski commented on a change in pull request #11403: 
[FLINK-16316][operators] Implement new StreamOperatorBase as a replacement for 
AbstractStreamOperator
URL: https://github.com/apache/flink/pull/11403#discussion_r397100621
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/YieldingOperatorFactory.java
 ##########
 @@ -17,10 +17,13 @@
 
 package org.apache.flink.streaming.api.operators;
 
+import org.apache.flink.annotation.PublicEvolving;
+
 /**
  * An operator that needs access to the {@link MailboxExecutor} to yield to 
downstream operators needs to be created
  * through a factory implementing this interface.
  */
+@PublicEvolving
 public interface YieldingOperatorFactory<OUT> extends 
StreamOperatorFactory<OUT> {
 
 Review comment:
   Maybe let's keep it for now as it is? As I'm not sure if I like the idea of 
nullifying parameters based on `needsMailboxExecutor()`. I think I would prefer 
mixed pattern to that.

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