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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are writing a producer application and need to ensure proper delivery. You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
(Select two.)

A) Check that producer.send() returned a RecordMetadata object and is not null.
B) Check the value of ProducerRecord.status().
C) Surround the call of producer.send() with a try/catch block to catch KafkaException.
D) Use a callback argument in producer.send() where you check delivery status.

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

3. You need to explain the best reason to implement the consumer callback interface ConsumerRebalanceListener prior to a Consumer Group Rebalance.
Which statement is correct?

A) Partition leaders may change.
B) Offsets are compacted.
C) Partitions assigned to a consumer may change.
D) Previous log files are deleted.

4. You have a Kafka consumer in production actively reading from a critical topic.
You need to update the offset of your consumer to start reading from the beginning of the topic.
Which action should you take?

A) Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
B) Update the consumer configuration by setting auto.offset.reset=earliest.
C) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
D) Start a new consumer application with the same consumer group id.

5. (You are writing lightweight XML messages to a Kafka topic named userinfo.
Which format should you use for the value field?)

A) XmlSerializer
B) StringSerializer
C) VoidSerializer
D) ByteSerializer

Solutions: