Salva created FLINK-27872:
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             Summary: Allow KafkaBuilder to set arbitrary subscribers
                 Key: FLINK-27872
                 URL: https://issues.apache.org/jira/browse/FLINK-27872
             Project: Flink
          Issue Type: New Feature
          Components: Connectors / Kafka
            Reporter: Salva


The 
[KafkaBuilder](https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilder.java)
 has the following methods:
 * 
[setTopics|https://github.com/apache/flink/blob/586715f23ef49939ab74e4736c58d71c643a64ba/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilder.java#L157]
 * 
[setTopicsPattern|https://github.com/apache/flink/blob/586715f23ef49939ab74e4736c58d71c643a64ba/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilder.java#L168]

which under the hood instantiate the corresponding subscribers. Those two 
subscribers should cover most of the cases, I agree, but in some cases they 
might fall short. Why not adding a more generic setter:
 * `setKafkaSubscriber`

Otherwise, how can users read from kafka in combination with custom subscribing 
logic? Without looking much into it, it seems that they basically cannot, at 
least without having to replicate some parts of the connector, which seems 
rather inconvenient.



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