Kafka MCQs – Kafka Java Client Programming

Learning Kafka Java Client Programming is essential for building robust, high-performance applications that can produce and consume real-time data. This section of Kafka MCQs focuses on the practical understanding of Java-based Kafka producers and consumers, including Kafka client APIs, serializers, configuration properties, record acknowledgments, and best practices.

These questions are especially helpful for interview preparation as they target real-world use cases and test your ability to implement Kafka logic in Java-based applications.

1.) Which Maven dependency is required for Kafka Java client programming?

A) org.kafka:kafka-client
B) org.apache.kafka:kafka-clients
C) org.kafka:clients
D) apache.kafka:kafka-client

Answer: Option B

Explanation: This is the correct Maven artifact for Kafka Java clients.

2.) What class is used to send messages in Kafka Java client?

A) KafkaSender
B) KafkaProducer
C) KafkaPublisher
D) KafkaClient

Answer: Option B

Explanation: The KafkaProducer class is responsible for producing messages to Kafka.

3.) Which method is used to send messages using KafkaProducer?

A) sendData()
B) produce()
C) send()
D) publish()

Answer: Option C

Explanation: The send() method is used to publish messages to a Kafka topic.

4.) KafkaProducer requires which two serializers to be configured?

A) Key and value serializers
B) Topic and partition serializers
C) Offset and value serializers
D) Schema and type serializers

Answer: Option A

Explanation: KafkaProducer requires both key and value serializer classes for serialization.

5.) What is the default acknowledgment setting in KafkaProducer?

A) 0
B) 1
C) all
D) none

Answer: Option B

Explanation: By default, acks=1 means the leader broker will acknowledge once the record is written.

6.) What type does the send() method return?

A) void
B) CompletableFuture
C) RecordResult
D) Future<RecordMetadata>

Answer: Option D

Explanation: send() returns a Future to retrieve metadata about the record when it’s acknowledged.

7.) Which interface is used for creating custom partitioning logic?

A) PartitionHandler
B) Partitioner
C) KafkaPartitioner
D) PartitionResolver

Answer: Option B

Explanation: Kafka uses the org.apache.kafka.clients.producer.Partitioner interface for custom partitioning.

8.) What configuration property sets the Kafka bootstrap servers?

A) kafka.broker.address
B) bootstrap.servers
C) kafka.cluster.hosts
D) server.endpoints

Answer: Option B

Explanation: This specifies the initial Kafka broker(s) to connect for discovering cluster information.

9.) Which class is used to consume messages in Kafka?

A) KafkaReceiver
B) KafkaMessageReader
C) KafkaConsumer
D) KafkaTopicConsumer

Answer: Option C

Explanation: KafkaConsumer is the main class for reading messages from Kafka topics.

10.) KafkaConsumer must be configured with which deserializer properties?

A) key.deserializer and value.deserializer
B) topic.deserializer and key.deserializer
C) value.deserializer and topic.deserializer
D) key.serializer and value.serializer

Answer: Option A

Explanation: Consumers must deserialize both the key and value to Java types.

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