PatrickRen commented on a change in pull request #16809:
URL: https://github.com/apache/flink/pull/16809#discussion_r688554532



##########
File path: 
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicSource.java
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@@ -137,6 +148,11 @@
     /** Flag to determine source mode. In upsert mode, it will keep the 
tombstone message. * */
     protected final boolean upsertMode;
 
+    /** Whether to use legacy {@link FlinkKafkaConsumer} for runtime 
execution. */
+    protected final boolean fallbackToFlinkKafkaConsumer;

Review comment:
       I think most of the code can be reused for the legacy switch, so I'd 
like to keep it for now. 




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