Levani Kokhreidze created FLINK-36817:
-----------------------------------------

             Summary: Give users ability to provide their own KafkaConsumer 
when using flink-connector-kafka
                 Key: FLINK-36817
                 URL: https://issues.apache.org/jira/browse/FLINK-36817
             Project: Flink
          Issue Type: New Feature
          Components: Connectors / Kafka
            Reporter: Levani Kokhreidze


In certain scenarios users of the `KafkaSource` in the flink-connector-kafka 
might want to provide their own KafkaConsumer. Right now this is not possible 
as consumer is created in the 
[KafkaPartitionSplitReader|https://github.com/apache/flink-connector-kafka/blob/main/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/reader/KafkaPartitionSplitReader.java#L97]
 which makes customisation impossible.

Proposal is to let users pass `KafkaConsumerFactory` when building the 
KafkaSource.
{code:java}
public interface KafkaConsumerFactory {
  KafkaConsumer<byte[], byte[]> get(Properties properties);
}{code}
Builder will have a default implementation which creates the KafkaConsumer the 
same as it is done now.



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