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Java Producer with Keys

Pragya Keshap answered on February 11, 2023 Popularity 1/10 Helpfulness 1/10

answer Java Producer with Keys

Java Producer with Keys

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Keys become useful when a user wants to introduce ordering and ensure the messages that share the same key end up in the same partition.

The ProducerRecord constructor accepts a key as shown below:

        for (int i=0; i<10; i++ ) {

            // create a producer record

            String topic = "demo_java";
            String value = "hello world " + Integer.toString(i);
            String key = "id_" + Integer.toString(i);

            ProducerRecord<String, String> producerRecord =
                    new ProducerRecord<>(topic, key, value);

            // send data - asynchronous
            producer.send(producerRecord, new Callback() {
                public void onCompletion(RecordMetadata recordMetadata, Exception e) {
                    // executes every time a record is successfully sent or an exception is thrown
                    if (e == null) {
                        // the record was successfully sent
                        log.info("Received new metadata. \n" +
                                "Topic:" + recordMetadata.topic() + "\n" +
                                "Key:" + producerRecord.key() + "\n" +
                                "Partition: " + recordMetadata.partition() + "\n" +
                                "Offset: " + recordMetadata.offset() + "\n" +
                                "Timestamp: " + recordMetadata.timestamp());
                    } else {
                        log.error("Error while producing", e);
                    }
                }
            });
        }

https://www.conduktor.io/kafka/complete-kafka-producer-with-java/

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java producer

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Contributed on Feb 11 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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