tzulitai commented on code in PR #20:
URL: 
https://github.com/apache/flink-connector-kafka/pull/20#discussion_r1332045177


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flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/KafkaSource.java:
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@@ -98,20 +98,24 @@
     private final KafkaRecordDeserializationSchema<OUT> deserializationSchema;
     // The configurations.
     private final Properties props;
+    // Client rackId callback
+    private final Supplier<String> rackIdSupplier;

Review Comment:
   I think we must address this before we merge this PR.
   At the very least, the `Supplier` needs to be serializable.
   
   You can use the `SerializableSupplier` interface from Flink.



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