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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Kafka producers can batch messages going to the same partition.
Which statement is correct about producer batching?

A) Two or more broker failures will automatically disable batching on the producer.
B) Producers can only batch messages of the same size.
C) Producers have a separate background thread for each batch.
D) Producers can include multiple batches in a single request to a broker.

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

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

3. You are composing a REST request to create a new connector in a running Connect cluster. You invoke POST /connectors with a configuration and receive a 409 (Conflict) response.
What are two reasons for this response? (Select two.)

A) The Connect cluster is in process of rebalancing.
B) The connect cluster has reached capacity, and new connectors cannot be created without expanding the cluster.
C) The connector configuration was invalid, and the response body will expand on the configuration error.
D) The Connector already exists in the cluster.

4. The producer code below features a Callback class with a method called onCompletion().
In the onCompletion() method, when the request is completed successfully, what does the value metadata.
offset() represent?

A) The number of bytes that overflowed beyond a producer batch of messages
B) The ID of the partition to which the message was committed
C) The sequential ID of the message committed into a partition
D) Its position in the producer's batch of messages

5. (You are experiencing low throughput from a Java producer.
Kafka producer metrics show a low I/O thread ratio and low I/O thread wait ratio.
What is the most likely cause of the slow producer performance?)

A) Compression is enabled.
B) There is a bad data link layer (Layer 2) connection from the producer to the cluster.
C) The producer code has an expensive callback function.
D) The producer is sending large batches of messages.

Solutions: