Confluent CCDAK Exam : Confluent Certified Developer for Apache Kafka Certification Examination

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Confluent CCDAK Exam Syllabus Topics:

Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You are developing a Kafka Streams application with a complex topology that has multiple sources, processors, sinks, and sub-topologies.
You are working in a development environment and do not have access to a real Kafka cluster or topics.
You need to perform unit testing on your Kafka Streams application.
Which should you use?)

A) KafkaUnitTestDriver
B) MockProducer, MockConsumer
C) TopologyTestDriver
D) TestProducer, TestConsumer

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

3. Your Kafka cluster has five brokers. The topic t1 on the cluster has:
Two partitions
Replication factor = 4
min.insync.replicas = 3You need strong durability guarantees for messages written to topic t1.You configure a producer acks=all and all the replicas for t1 are in-sync.How many brokers need to acknowledge a message before it is considered committed?

A) 2
B) 5
C) 4
D) 3

4. You have a consumer group with default configuration settings reading messages from your Kafka cluster.
You need to optimize throughput so the consumer group processes more messages in the same amount of time.
Which change should you make?

A) Decrease the session timeout of each consumer.
B) Remove some consumers from the consumer group.
C) Increase the number of bytes the consumers read with each fetch request.
D) Disable auto commit and have the consumers manually commit offsets.

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 call the consumer.skip() method.
C) Log the bad record and seek the consumer to the offset of the next record.
D) Log the bad record, no other action needed.

Solutions: