What is the method for providing input to a kafka processor?

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The method for providing input to a Kafka processor is by producing data records, also known as messages, to a Kafka topic. These messages can be generated by producers or other sources of data and are typically key-value pairs encoded in a specific format such as JSON or Avro. The Kafka processor, also known as a consumer, subscribes to one or more topics and consumes the messages in the order they were produced. The processor can then process the messages in various ways, such as aggregating or transforming the data, and output the results to another topic or external system.