Path Lines of Code flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/enumerator/KafkaSourceEnumerator.java 451 flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java 1262 flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/FlinkKafkaInternalProducer.java 314 flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaConsumerThread.java 310 flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaShuffleFetcher.java 211 flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/shuffle/FlinkKafkaShuffle.java 135