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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are developing a Java application using a Kafka consumer.
You need to integrate Kafka's client logs with your own application's logs using log4j2.
Which Java library dependency must you include in your project?

A) SLF4J implementation for Log4j2 (org.apache.logging.log4j:log4j-slf4j-impl)
B) None, the right dependency will be added by the Kafka client dependency by transitivity.
C) SLF4J implementation for Log4j 1.2 (org.slf4j:slf4j-log4j12)
D) Just the log4j2 dependency of the application

2. You are building a system for a retail store selling products to customers.
Which three datasets should you model as a GlobalKTable?
(Select three.)

A) Log of payment transactions
B) Customer profile information
C) Inventory of products at a warehouse
D) All purchases at a retail store occurring in real time
E) Catalog of products

3. Your application is consuming from a topic with one consumer group.
The number of running consumers is equal to the number of partitions.
Application logs show that some consumers are leaving the consumer group during peak time, triggering a rebalance. You also notice that your application is processing many duplicates.
You need to stop consumers from leaving the consumer group.
What should you do?

A) Add more consumer instances.
B) Split consumers in different consumer groups.
C) Reduce max.poll.records property.
D) Increase session.timeout.ms property.

4. You have a Kafka Connect cluster with multiple connectors.
One connector is not working as expected.
How can you find logs related to that specific connector?

A) Modify the log4j.properties file to enable connector context.
B) Make no change, there is no way to find logs other than by stopping all the other connectors.
C) Change the log level to DEBUG to have connector context information in logs.
D) Modify the log4j.properties file to add a dedicated log appender for the connector.

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

Solutions: