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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Which two statements about Kafka Connect Single Message Transforms (SMTs) are correct?
(Select two.)

A) SMT functionality is included within Kafka Connect converters.
B) Multiple SMTs can be chained together and act on source or sink messages.
C) Masking data is a good example of an SMT.
D) SMTs are often used to join multiple records from a source data system into a single Kafka record.

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

3. (You want to read messages from all partitions of a topic in every consumer instance of your application.
How do you do this?)

A) Use the subscribe() method with an empty consumer group name configuration.
B) Use the subscribe() method with a regular expression argument.
C) Use the assign() method with the topic name as argument.
D) Use the assign() method using all topic-partitions of the topic as argument.

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

5. (Your application consumes from a topic configured with a deserializer.
You want the application to be resilient to badly formatted records (poison pills).
You surround the poll() call with a try/catch block for RecordDeserializationException.
You need to log the bad record, skip it, and continue processing other records.
Which action should you take in the catch block?)

A) Log the bad record and call consumer.skip() method.
B) Log the bad record and seek the consumer to the offset of the next record.
C) Throw a runtime exception to trigger a restart of the application.
D) Log the bad record; no other action is needed.

Solutions: