Kafka installation and setup - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to download Kafka using wget.

Kafka

wget [1]

Drag options to blanks, or click blank then click option'

Ahttps://example.com/kafka.zip

Bhttps://kafka.apache.org/downloads

Chttps://downloads.apache.org/kafka/3.5.1/kafka_2.13-3.5.1.tgz

Dhttps://apache.org/kafka/latest

Attempts:

3 left

💡 Hint

Common Mistakes

Using the website homepage URL instead of the direct download link.

Downloading a wrong file format like .zip instead of .tgz.

The correct URL points directly to the Kafka 3.5.1 tarball for Scala 2.13.

2fill in blank

medium

Complete the command to extract the Kafka archive.

Kafka

tar [1] kafka_2.13-3.5.1.tgz

Drag options to blanks, or click blank then click option'

A-cvf

B-xzvf

C-xvzf

D-xzf

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'c' which is for creating archives instead of extracting.

Omitting the 'z' option for gzip compressed files.

The option -xzvf extracts a gzip compressed tarball verbosely.

3fill in blank

hard

Fix the error in the command to start the Kafka server.

Kafka

bin/kafka-server-start.sh [1]/config/server.properties

Drag options to blanks, or click blank then click option'

Akafka_2.13-3.5.1

Bkafka_2.13-3.5.1/config

Ckafka/config

Dconfig

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'config' without the Kafka folder prefix.

Using an incorrect folder path.

The correct path includes the extracted Kafka folder and the config directory.

4fill in blank

hard

Fill both blanks to create a topic named 'test' with 1 partition and replication factor 1.

Kafka

bin/kafka-topics.sh --create --topic [1] --partitions [2] --replication-factor 1 --bootstrap-server localhost:9092

Drag options to blanks, or click blank then click option'

Atest

B1

C3

Dmytopic

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different topic name.

Setting partitions to a number other than 1.

The topic name is 'test' and it has 1 partition.

5fill in blank

hard

Fill both blanks to list all topics using the correct bootstrap server and command.

Kafka

bin/kafka-topics.sh --list --bootstrap-server [1]:[2]

Drag options to blanks, or click blank then click option'

Alocalhost

B9092

C127.0.0.1

D2181

Attempts:

3 left

💡 Hint

Common Mistakes

Using Zookeeper port 2181 instead of Kafka port 9092.

Using IP address instead of localhost.

The bootstrap server is localhost on port 9092 for Kafka.

Practice

1. What is the first step to start Kafka on your local machine?

easy

A. Start Zookeeper service

B. Create Kafka topics

C. Run Kafka producer

D. Install Java

Solution

1. Step 1: Understand Kafka dependencies

   Kafka requires Zookeeper to coordinate its services.

2. Step 2: Start Zookeeper before Kafka

   You must start Zookeeper first to allow Kafka to connect and run properly.

3. Final Answer:

   Start Zookeeper service -> Option A

4. Quick Check:

   Kafka needs Zookeeper first = Start Zookeeper service [OK]

Hint: Always start Zookeeper before Kafka server [OK]

Common Mistakes:

• Starting Kafka before Zookeeper
• Skipping Zookeeper start
• Trying to create topics before server runs

2. Which command correctly starts the Kafka server after Zookeeper is running?

easy

A. bin/kafka-topics.sh --create --topic test

B. bin/zookeeper-server-start.sh config/zookeeper.properties

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

D. bin/kafka-console-producer.sh --topic test

Solution

1. Step 1: Identify Kafka server start command

   The Kafka server is started using kafka-server-start.sh with server properties.

2. Step 2: Differentiate from other commands

   Zookeeper start uses zookeeper-server-start.sh; topic creation and producer commands are different tools.

3. Final Answer:

   bin/kafka-server-start.sh config/server.properties -> Option C

4. Quick Check:

   Kafka server start = bin/kafka-server-start.sh config/server.properties [OK]

Hint: Kafka server uses kafka-server-start.sh script [OK]

Common Mistakes:

• Using zookeeper start command for Kafka
• Confusing topic creation with server start
• Running producer before server

3. What will be the output when you run this command after starting Kafka server?
bin/kafka-topics.sh --list --bootstrap-server localhost:9092

medium

A. Lists all existing Kafka topics

B. Starts the Kafka server

C. Creates a new topic named 'localhost'

D. Shows Zookeeper status

Solution

1. Step 1: Understand the command purpose

   The command lists topics using the Kafka bootstrap server address.

2. Step 2: Identify output type

   It outputs all existing topics in Kafka, not starting server or creating topics.

3. Final Answer:

   Lists all existing Kafka topics -> Option A

4. Quick Check:

   --list shows topics = Lists all existing Kafka topics [OK]

Hint: Use --list with --bootstrap-server to see topics [OK]

Common Mistakes:

• Thinking it starts Kafka server
• Assuming it creates topics
• Confusing with Zookeeper commands

4. You tried to start Kafka server but got an error saying 'Could not connect to Zookeeper'. What is the likely cause?

medium

A. Kafka server is already running

B. Zookeeper service is not running

C. Topic name is missing

D. Java is not installed

Solution

1. Step 1: Analyze error message

   'Could not connect to Zookeeper' means Kafka cannot reach Zookeeper service.

2. Step 2: Identify cause

   This usually happens if Zookeeper is not started or crashed.

3. Final Answer:

   Zookeeper service is not running -> Option B

4. Quick Check:

   Connection error = Zookeeper not running [OK]

Hint: Check Zookeeper is running before Kafka start [OK]

Common Mistakes:

• Ignoring Zookeeper status
• Assuming Kafka server conflict
• Blaming missing topic name

5. You want to test Kafka by sending messages to a topic named 'test'. Which sequence of commands is correct after starting Zookeeper and Kafka server?

hard

A. Start kafka-console-consumer.sh, then create topic with kafka-topics.sh

B. Only start Zookeeper and produce messages directly

C. Run kafka-server-start.sh twice, then produce messages

D. Create topic with kafka-topics.sh, then produce messages with kafka-console-producer.sh

Solution

1. Step 1: Create the topic first

   You must create the topic 'test' before sending messages to it.

2. Step 2: Use producer to send messages

   After topic creation, use kafka-console-producer.sh to send messages to 'test'.

3. Final Answer:

   Create topic with kafka-topics.sh, then produce messages with kafka-console-producer.sh -> Option D

4. Quick Check:

   Create topic then produce = Create topic with kafka-topics.sh, then produce messages with kafka-console-producer.sh [OK]

Hint: Create topic before producing messages [OK]

Common Mistakes:

• Producing messages before topic creation
• Starting Kafka server twice unnecessarily
• Skipping Kafka server start