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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. (What are two stateless operations in the Kafka Streams API?
Select two.)

A) GroupBy
B) Filter
C) Join
D) Reduce

3. (You are implementing a Kafka Streams application to process financial transactions.
Each transaction must be processed exactly once to ensure accuracy.
The application reads from an input topic, performs computations, and writes results to an output topic.
During testing, you notice duplicate entries in the output topic, which violates the exactly-once processing requirement.
You need to ensure exactly-once semantics (EOS) for this Kafka Streams application.
Which step should you take?)

A) Set enable.exactly_once=true in the Kafka Streams configuration.
B) Enable compaction on the output topic to handle duplicates.
C) Set enable.idempotence=true in the internal producer configuration of the Kafka Streams application.
D) Set processing.guarantee=exactly_once_v2 in the Kafka Streams configuration.

4. (You are developing a Java application that includes a Kafka consumer.
You need to integrate Kafka client logs with your own application logs.
Your application is using the Log4j2 logging framework.
Which Java library dependency must you include in your project?)

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

5. (You deploy a Kafka Streams application with five application instances.
Kafka Streams stores application metadata using internal topics.
Auto-topic creation is disabled in the Kafka cluster.
Which statement about this scenario is true?)

A) The application will work, but application metadata will not be stored.
B) The application will terminate with a non-retriable exception.
C) The application will continue to work and internal topics will be created, even if auto-topic creation is disabled.
D) The application will be on hold until internal topics are created manually.

Solutions: