Java producer client in Kafka - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of a Java Kafka producer client?

A Java Kafka producer client sends data (messages) to Kafka topics, acting like a sender in a messaging system.

beginner

Which Java class is used to create a Kafka producer client?

The <code>KafkaProducer&lt;K, V&gt;</code> class is used to create a Kafka producer client in Java.

beginner

What are the essential properties needed to configure a Kafka producer client in Java?

You need to set bootstrap.servers (Kafka server addresses), key.serializer, and value.serializer to tell Kafka how to send and encode messages.

intermediate

How do you send a message asynchronously using a Kafka producer in Java?

Use the send() method of KafkaProducer with a ProducerRecord. It returns a Future<RecordMetadata> for optional callback handling.

beginner

Why should you call producer.close() after sending messages?

Calling close() flushes all buffered messages and releases resources, ensuring no data is lost before the program ends.

Which property specifies the Kafka server addresses in a Java producer client?

A producer.server

B server.address

C kafka.host

D bootstrap.servers

The bootstrap.servers property tells the producer where Kafka servers are located.

What does the send() method of KafkaProducer return?

A A Future representing the result of the send operation

B The message key

C The topic name

D Nothing (void)

The send() method returns a Future<RecordMetadata> so you can check if the message was sent successfully.

Which serializers are required for a Kafka producer client?

A Key and value serializers

B Only key serializer

C Only value serializer

D No serializers needed

Both key and value serializers are needed to convert data into bytes for Kafka.

What happens if you don't call close() on a Kafka producer?

A Messages are sent immediately without buffering

B Some messages may not be sent and resources may leak

C Kafka server shuts down

D Producer automatically closes after sending

Without calling close(), buffered messages might not be sent and resources stay open.

Which class represents a message to send in Kafka producer client?

A KafkaSend

B KafkaMessage

C ProducerRecord

D MessageRecord

The ProducerRecord class holds the topic, key, and value for a message.

Explain how to create and configure a Java Kafka producer client from scratch.

Think about what settings Kafka needs to connect and how to tell it how to convert data.

Describe the steps to send a message asynchronously using a Java Kafka producer client.

Focus on how to prepare the message and how to send it safely.