PatrickRen commented on code in PR #19366:
URL: https://github.com/apache/flink/pull/19366#discussion_r845833503


##########
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/enumerator/subscriber/KafkaSubscriber.java:
##########
@@ -38,9 +38,11 @@
  * </ol>
  *
  * <p>The KafkaSubscriber provides a unified interface for the Kafka source to 
support all these
- * three types of subscribing mode.
+ * three types of subscribing mode. {@link
+ * org.apache.flink.connector.kafka.source.enumerator.KafkaSourceEnumerator} 
only supports adding
+ * new splits and not removing splits in split discovery.
  */
-@Internal
+@PublicEvolving

Review Comment:
   IMHO it's reasonable to make `KafkaSubscriber` public. As we are exposing 
new APIs to users, what about starting a discussion in dev and user mailing 
list? 



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