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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (Your configuration parameters for a Source connector and Connect worker are:
* offset.flush.interval.ms=60000
* offset.flush.timeout.ms=500
* offset.storage.topic=connect-offsets
* offset.storage.replication.factor=-1
Which two statements match the expected behavior?
Select two.)

A) The connector will wait 500 ms before trying to commit offsets for tasks.
B) The offsets topic will use the broker default replication factor.
C) The connector will commit offsets to the broker default offsets topic.
D) The connector will commit offsets to a topic called connect-offsets.

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

3. You need to explain the best reason to implement the consumer callback interface ConsumerRebalanceListener prior to a Consumer Group Rebalance.
Which statement is correct?

A) Previous log files are deleted.
B) Partitions assigned to a consumer may change.
C) Offsets are compacted.
D) Partition leaders may change.

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

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

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

Solutions: