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What is the role of the Partitioning Key?

Pragya Keshap answered on February 6, 2023 Popularity 1/10 Helpfulness 1/10

answer What is the role of the Partitioning Key?

What is the role of the Partitioning Key?

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Messages are sent to various partitions associated with a topic in a round-robin fashion.

If there is a requirement to send a message to a particular partition, then it is possible to associate a key with the message.

The key determines which partition that particular message will go to.

All messages with the same key will go to the same partition.

If a key is not specified for a message, the producer will choose the partition in a round-robin fashion.

@SpringBootApplication
@EnableBinding(Source.class)
public class KafkaPartitionProducerApplication {

    private static final Random RANDOM = new Random(System.currentTimeMillis());

    private static final String[] data = new String[] {
            "foo1", "bar1", "qux1",
            "foo2", "bar2", "qux2",
            "foo3", "bar3", "qux3",
            "foo4", "bar4", "qux4",
            };

    public static void main(String[] args) {
        new SpringApplicationBuilder(KafkaPartitionProducerApplication.class)
            .web(false)
            .run(args);
    }

    @InboundChannelAdapter(channel = Source.OUTPUT, poller = @Poller(fixedRate = "5000"))
    public Message<?> generate() {
        String value = data[RANDOM.nextInt(data.length)];
        System.out.println("Sending: " + value);
        return MessageBuilder.withPayload(value)
                .setHeader("partitionKey", value)
                .build();
    }

}

https://medium.com/event-driven-utopia/understanding-kafka-topic-partitions-ae40f80552e8

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java partitioning role

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Contributed on Feb 06 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What is the role of the Partitioning Key?

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