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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are writing to a topic with acks=all.
The producer receives acknowledgments but you notice duplicate messages.
You find that timeouts due to network delay are causing resends.
Which configuration should you use to prevent duplicates?

A) retries=0max.in.flight.requests.per.connection=5enable.idempotence=true
B) retries=2147483647max.in.flight.requests.per.connection=1enable.idempotence=false
C) enable.auto.commit=true
D) retries=2147483647max.in.flight.requests.per.connection=5enable.idempotence=true

2. The producer code below features a Callback class with a method called onCompletion().
In the onCompletion() method, when the request is completed successfully, what does the value metadata.
offset() represent?

A) The ID of the partition to which the message was committed
B) The number of bytes that overflowed beyond a producer batch of messages
C) Its position in the producer's batch of messages
D) The sequential ID of the message committed into a partition

3. (You are building real-time streaming applications using Kafka Streams.
Your application has a custom transformation.
You need to define custom processors in Kafka Streams.
Which tool should you use?)

A) Processor API
B) TopologyTestDriver
C) Kafka Streams Custom Transformation Language
D) Kafka Streams Domain Specific Language (DSL)

4. (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) Make no change; there is no way to isolate connector logs.
C) Modify the log4j.properties file to enable connector context.
D) Change the log level to DEBUG to include connector context information.

5. (You are experiencing low throughput from a Java producer.
Kafka producer metrics show a low I/O thread ratio and low I/O thread wait ratio.
What is the most likely cause of the slow producer performance?)

A) Compression is enabled.
B) There is a bad data link layer (Layer 2) connection from the producer to the cluster.
C) The producer code has an expensive callback function.
D) The producer is sending large batches of messages.

Solutions: