Kafka installation and setup - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Kafka console producer command?

You run the following command to send a message to a Kafka topic named test-topic. What will be the output shown in the terminal after sending the message?

Kafka

echo "Hello Kafka" | kafka-console-producer.sh --broker-list localhost:9092 --topic test-topic

A Error: Topic 'test-topic' does not exist

B Producer started, waiting for input

C Message sent successfully with no output

D Hello Kafka

💡 Hint

The console producer command sends the message silently unless there is an error.

The kafka-console-producer.sh command sends the message to the broker silently. It does not print the message or any confirmation unless there is an error.

🧠 Conceptual

intermediate

Which service must be running before starting Kafka broker?

Before starting the Kafka broker, which service must be running to ensure Kafka works properly?

A Zookeeper

B Kafka Connect

C Kafka Streams

D Kafka Producer

💡 Hint

Kafka uses this service to manage cluster metadata and leader election.

Kafka depends on Zookeeper to manage cluster metadata and coordinate brokers. Zookeeper must be running before Kafka starts.

🔧 Debug

advanced

Why does Kafka broker fail to start with this error?

You try to start Kafka broker but get this error: ERROR Fatal error during KafkaServer startup. The logs show Port 9092 already in use. What is the most likely cause?

Kafka

bin/kafka-server-start.sh config/server.properties

A Zookeeper is not running

B Another Kafka broker or process is already using port 9092

C The server.properties file is missing

D Kafka version is incompatible with Java version

💡 Hint

Check if any other process is using the default Kafka port.

The error indicates port 9092 is busy, so Kafka cannot bind to it. This usually means another Kafka broker or process is running on that port.

📝 Syntax

advanced

Which command correctly creates a Kafka topic named 'orders' with 3 partitions?

Select the correct command to create a Kafka topic named orders with 3 partitions and a replication factor of 1.

A kafka-topics.sh --create --topic orders --partitions 3 --replication-factor 1 --bootstrap-server localhost:9092

B kafka-topics.sh --create --topic orders --partition 3 --replication 1 --zookeeper localhost:2181

C kafka-topics.sh --create --topic orders --partitions=3 --replication-factor=1 --bootstrap-server localhost:9092

D kafka-topics.sh --create orders --partitions 3 --replication-factor 1 --bootstrap-server localhost:9092

💡 Hint

Check the exact option names and syntax for partitions and replication factor.

Option A uses the correct option names and syntax for creating a topic with partitions and replication factor using --bootstrap-server.

🚀 Application

expert

How to configure Kafka broker to listen on all network interfaces?

You want your Kafka broker to accept connections from any IP address on your machine. Which configuration setting in server.properties achieves this?

A advertised.listeners=PLAINTEXT://0.0.0.0:9092

B advertised.listeners=PLAINTEXT://localhost:9092

C listeners=PLAINTEXT://127.0.0.1:9092

D listeners=PLAINTEXT://0.0.0.0:9092

💡 Hint

The listeners setting controls where Kafka binds to accept connections.

Setting listeners=PLAINTEXT://0.0.0.0:9092 makes Kafka listen on all network interfaces. advertised.listeners controls what Kafka tells clients to connect to.