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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You use Kafka Connect with the JDBC source connector to extract data from a large database and push it into Kafka.
The database contains tens of tables, and the current connector is unable to process the data fast enough.
You add more Kafka Connect workers, but throughput doesn't improve.
What should you do next?

A) Increase the number of Kafka partitions for the topics.
B) Increase the value of the connector's property tasks.max.
C) Add more Kafka brokers to the cluster.
D) Modify the database schemas to enable horizontal sharding.

2. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Consumers will need to process data from more partitions which will significantly increase consumer lag.
B) Records with the same key could be located in different partitions.
C) The acknowledgment process will increase latency for producers using acks=all.
D) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.

3. You have a consumer group with default configuration settings reading messages from your Kafka cluster.
You need to optimize throughput so the consumer group processes more messages in the same amount of time.
Which change should you make?

A) Decrease the session timeout of each consumer.
B) Increase the number of bytes the consumers read with each fetch request.
C) Remove some consumers from the consumer group.
D) Disable auto commit and have the consumers manually commit offsets.

4. In Avro, adding an element to an enum without a default is a __ schema evolution

A) full
B) breaking
C) forward
D) backward

5. A producer is sending messages with null key to a topic with 6 partitions using the DefaultPartitioner. Where will the messages be stored?

A) Partition 5
B) The partition for the null key
C) Partition 0
D) Any of the topic partitions

Solutions: