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

2. You create a producer that writes messages about bank account transactions from tens of thousands of different customers into a topic.
Your consumers must process these messages with low latency and minimize consumer lag Processing takes ~6x longer than producing Transactions for each bank account must be processed in orderWhich strategy should you use?

A) Use a unique identifier such as a universally unique identifier (UUID) as the message key.
B) Use the timestamp of the message's arrival as its key.
C) Use a combination of the bank account number and the transaction timestamp as the message key.
D) Use the bank account number found in the message as the message key.

3. 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) Start a new consumer application with the same consumer group id.
D) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.

4. Your company has three Kafka clusters: Development, Testing, and Production.
The Production cluster is running out of storage, so you add a new node.
Which two statements about the new node are true?
(Select two.)

A) A new node can be added without stopping existing cluster nodes.
B) A node ID will be assigned to the new node automatically.
C) A newly added node will have KRaft controller role by default.
D) A new node will not have any partitions assigned to it unless a new topic is created or reassignment occurs.

5. You are working on a Kafka cluster with three nodes. You create a topic named orders with:
replication.factor = 3
min.insync.replicas = 2
acks = allWhat exception will be generated if two brokers are down due to network delay?

A) NotCoordinatorException
B) NotLeaderForPartitionException
C) NotEnoughReplicasException
D) NetworkException

Solutions: