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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You have a topic with four partitions. The application reads from it using two consumers in a single consumer group.
Processing is CPU-bound, and lag is increasing.
What should you do?

A) Increase the max.poll.records property of consumers.
B) Add more consumers to increase the level of parallelism of the processing.
C) Decrease the max.poll.records property of consumers.
D) Add more partitions to the topic to increase the level of parallelism of the processing.

2. Which statements are correct about ksqlDB SQL? (Choose 3.)

A) Primary key indexing is supported.
B) Queries can run continuously.
C) It supports windowed joins.
D) It can do joins.
E) It is ANSI compliant.

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

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

4. 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 stream
B) Purchase as stream, Product as stream, Customer as stream
C) Purchase as stream, Product as table, Customer as table
D) Purchase as table, Product as table, Customer as table

5. You are sending messages to a Kafka cluster in JSON format and want to add more information related to each message:
* Format of the message payload
* Message creation time
* A globally unique identifier that allows the message to be traced through the systemWhere should this additional information be set?

A) Header
B) Key
C) Broker
D) Value

Solutions: