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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You create a topic with five partitions.
What can you assume about messages read from that topic by a single consumer group?)

A) Messages from one partition can be consumed by any of the consumers in a group for faster processing.
B) Messages can be consumed by a maximum of five consumers in the same consumer group.
C) The consumer group can only read the same number of messages from all the partitions.
D) All messages will be read from exactly one broker by the consumer group.

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

3. (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) Change the log level to DEBUG to include connector context information.
B) Modify the log4j.properties file to enable connector context.
C) Modify the log4j.properties file to add a dedicated log appender for the connector.
D) Make no change; there is no way to isolate connector logs.

4. (You are writing to a Kafka topic with producer configuration acks=all.
The producer receives acknowledgements from the broker but still creates duplicate messages due to network timeouts and retries.
You need to ensure that duplicate messages are not created.
Which producer configuration should you set?)

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

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

Solutions: