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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Your company has three Kafka clusters: Development, Testing, and Production.
The Production cluster is running out of storage, so you add a new node.
Which two statements about the new node are true?
(Select two.)

A) A new node will not have any partitions assigned to it unless a new topic is created or reassignment occurs.
B) A node ID will be assigned to the new node automatically.
C) A newly added node will have KRaft controller role by default.
D) A new node can be added without stopping existing cluster nodes.

2. Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)

A) It is mandatory to subscribe to a topic before calling assign() to assign partitions.
B) The consumer chooses which partition to read without any assignment from brokers.
C) All topics must have the same number of partitions to use assign() API.
D) The consumer group will not be rebalanced if a consumer leaves the group.

3. An ecommerce wesbite sells some custom made goods. What's the natural way of modeling this data in Kafka streams?

A) Purchase as stream, Product as table, Customer as table
B) Purchase as stream, Product as stream, Customer as stream
C) Purchase as stream, Product as table, Customer as stream
D) Purchase as table, Product as table, Customer as table

4. You are writing a producer application and need to ensure proper delivery. You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
(Select two.)

A) Surround the call of producer.send() with a try/catch block to catch KafkaException.
B) Check that producer.send() returned a RecordMetadata object and is not null.
C) Use a callback argument in producer.send() where you check delivery status.
D) Check the value of ProducerRecord.status().

5. An application is writing AVRO messages using Schema Registry to topic t1. During this process, the Schema Registry becomes unavailable for a few seconds.
What is the expected impact to the application?

A) Since the broker will eventually replicate the message Schema, there will not be an error.
B) Since messages are cached by the producer, the application will only get an error if the producer is sending the batch at that time.
C) The application may not have any impact, unless it is writing messages with a new Schema Definition.
D) All messages within that time will receive an error.

Solutions: