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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. An ecommerce wesbite sells some custom made goods. What's the natural way of modeling this data in Kafka streams?

A) Purchase as stream, Product as table, Customer as table
B) Purchase as table, Product as table, Customer as table
C) Purchase as stream, Product as stream, Customer as stream
D) Purchase as stream, Product as table, Customer as stream

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

3. You are creating a Kafka Streams application to process retail data.
Match the input data streams with the appropriate Kafka Streams object.

4. What is returned by a producer.send() call in the Java API?

A) Future<RecordMetadata> object
B) A Boolean indicating if the call succeeded
C) Unit
D) Future<ProducerRecord> object

5. A kafka topic has a replication factor of 3 and min.insync.replicas setting of 1. What is the maximum number of brokers that can be down so that a producer with acks=all can still produce to the topic?

A) 3
B) 0
C) 2
D) 1

Solutions: