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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You have a Kafka client application that has real-time processing requirements.
What are the most important metrics available in Kafka that you should monitor?

A) Consumer heartbeat rate to the group coordinator
B) Aggregate incoming byte rate
C) Total time to serve requests to replica followers
D) Consumer lag between the brokers and the consumers

2. Refer to the producer code below. It features a 'Callback' class with a method called 'onCompletion()'. When will the 'onCompletion()' method be Invoked?

producer.send(record, new MyCallback(record));

A) When a consumer sends an acknowledgement to the producer
B) When a broker sends an acknowledgement to the producer
C) When the producer puts the message into its socket buffer
D) When the producer batches the message

3. Your Kafka cluster has five brokers. The topic t1 on the cluster has:
* Two partitions
* Replication factor = 4
* min.insync.replicas = 3You need strong durability guarantees for messages written to topic t1.You configure a producer acks=all and all the replicas for t1 are in-sync.How many brokers need to acknowledge a message before it is considered committed?

A) 5
B) 3
C) 4
D) 2

4. What is accomplished by producing data to a topic with a message key?

A) Consumers can filter messages in real time based on the message key without processing unrelated messages.
B) It provides a mechanism for encrypting messages at the partition level to ensure secure data transmission.
C) Messages with the same key are routed to a deterministically selected partition, enabling order guarantees within that partition.
D) Kafka brokers allow you to add more partitions to a given topic, without impacting the data flow for existing keys.

5. You have a consumer group of 12 consumers and when a consumer gets killed by the process management system, rather abruptly, it does not trigger a graceful shutdown of your consumer. Therefore, it takes up to 10 seconds for a rebalance to happen. The business would like to have a 3 seconds rebalance time. What should you do? (select two)

A) increase max.poll.interval.ms
B) Decrease heartbeat.interval.ms
C) Increase session.timeout.ms
D) decrease max.poll.interval.ms
E) Decrease session.timeout.ms
F) Increase heartbeat.interval.ms

Solutions: