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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You need to send a JSON message on the wire. The message key is a string.
How would you do this?)

A) Specify a value serializer class for the JSON contents of the message's value. Set a key serializer for the string value.
B) Specify a value serializer class for the JSON contents of the message's value. Set the key serializer class to JSON.
C) Specify a value serializer class for the JSON contents of the message's value. Set the key serializer class to null.
D) Specify a key serializer class for the JSON contents of the message's value. Set the value serializer class to null.

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

3. Kafka producers can batch messages going to the same partition.
Which statement is correct about producer batching?

A) Producers can include multiple batches in a single request to a broker.
B) Producers have a separate background thread for each batch.
C) Producers can only batch messages of the same size.
D) Two or more broker failures will automatically disable batching on the producer.

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

5. (Which configuration determines the maximum number of records a consumer can poll in a single call to poll()?)

A) max.poll.records.interval
B) max.records.consumer
C) fetch.max.records
D) max.poll.records

Solutions: