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I am able to list all Kafka Consumer with KafkaAdminClient:
AdminClient client = AdminClient.create(conf);
ListTopicsResult ltr = client.listTopics();
KafkaFuture<Set<String>> names = ltr.names();
ArrayList<ConsumerGroupListing> consumerGroups = new ArrayList<>(client.listConsumerGroups().all().get());
ConsumerGroupListing consumerGroup = consumerGroups.get(0);
Is it possible to list all registrated producers in a similar way?
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We have verified in practice that having only one producer is optimal per topic.
A '-list' command is used to list the number of consumer groups available in the Kafka Cluster. The command is used as: 'kafka-consumer-groups. bat -bootstrap-server localhost:9092 -list'.
Concepts. The Kafka producer is conceptually much simpler than the consumer since it has no need for group coordination. A producer partitioner maps each message to a topic partition, and the producer sends a produce request to the leader of that partition.
Listing Consumers To list the consumers in the Kafka cluster, we can use the kafka-consumer-groups.sh shell script. The –list option will list all the consumer groups:
Producers: In Kafka, the producer is playing a role to push data to the Kafka broker. When any new broker will be attached or sync with the Kafka eco-system then all the Kafka producers search it with the help of zookeeper. Then it will automatically start to push the message or data (records) to that new broker.
These consumers are in the same group, so the messages from topic partitions will be spread across the members of the group. This way we can implement the competing consumers pattern in Kafka. Let's consume from another topic, too: $ ./bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic users.verifications
In the Kafka producer, the producer will not wait for the record acknowledgment from the Kafka broker. It will directly send the messages and at the end, the Kafka broker will handle the message from there end. In the Kafka cluster level, the message handle frequency is very high.
In contrast to consumers, it is not possible to retrieve such information since Kafka brokers don't store any kind of information about the producers connected to them.
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