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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. 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) Messages with the same key are routed to a deterministically selected partition, enabling order guarantees within that partition.
C) It provides a mechanism for encrypting messages at the partition level to ensure secure data transmission.
D) Kafka brokers allow you to add more partitions to a given topic, without impacting the data flow for existing keys.

2. A stream processing application is consuming from a topic with five partitions. You run three instances of the application. Each instance has num.stream.threads=5.
You need to identify the number of stream tasks that will be created and how many will actively consume messages from the input topic.

A) 5 created, 5 actively consuming
B) 5 created, 1 actively consuming
C) 15 created, 5 actively consuming
D) 15 created, 15 actively consuming

3. (You have a Kafka Connect cluster with multiple connectors deployed.
One connector is not working as expected.
You need to find logs related to that specific connector to investigate the issue.
How can you find the connector's logs?)

A) Modify the log4j.properties file to add a dedicated log appender for the connector.
B) Change the log level to DEBUG to include connector context information.
C) Modify the log4j.properties file to enable connector context.
D) Make no change; there is no way to isolate connector logs.

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

A) Records with the same key could be located in different partitions.
B) Consumers will need to process data from more partitions which will significantly increase consumer lag.
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.

5. Which partition assignment minimizes partition movements between two assignments?

A) StickyAssignor
B) PartitionAssignor
C) RoundRobinAssignor
D) RangeAssignor

Solutions: