Topic creation in Kafka - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Kafka topic named 'my-topic'.

Kafka

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

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

Amy-topic

Btopic1

Ctest-topic

Dkafka-topic

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different topic name than 'my-topic'.

Omitting the --topic option.

The command creates a Kafka topic named my-topic.

2fill in blank

medium

Complete the code to create a Kafka topic with 3 partitions.

Kafka

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

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

A3

B1

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting partitions to 0 or a negative number.

Forgetting to specify the --partitions option.

The --partitions option sets the number of partitions. Here, 3 partitions are created.

3fill in blank

hard

Fix the error in the command to create a topic with replication factor 2.

Kafka

bin/kafka-topics.sh --create --topic my-topic --partitions 3 --replication-factor [1] --bootstrap-server localhost:9092

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

A0

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Setting replication factor to 0.

Using a replication factor larger than the number of brokers.

The replication factor must be at least 1 and not exceed the number of brokers. Here, 2 is correct.

4fill in blank

hard

Fill both blanks to create a topic named 'logs' with 4 partitions.

Kafka

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

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

Alogs

Bmetrics

C4

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping topic name and partitions values.

Using wrong topic name or partition count.

The topic name is logs and the number of partitions is 4.

5fill in blank

hard

Fill all three blanks to create a topic named 'events' with 6 partitions and replication factor 3.

Kafka

bin/kafka-topics.sh --create --topic [1] --partitions [2] --replication-factor [3] --bootstrap-server localhost:9092

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

Aevents

B6

C3

Dlogs

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect topic name.

Mixing up partitions and replication factor values.

The topic name is events, partitions are 6, and replication factor is 3.

Practice

1. What is the main purpose of a topic in Kafka?

easy

A. To compile Java programs

B. To store user login credentials

C. To manage database connections

D. To organize messages like folders organize files

Solution

1. Step 1: Understand Kafka topic role

   A Kafka topic is a category or feed name to which messages are published.

2. Step 2: Compare options with topic function

   Only To organize messages like folders organize files correctly describes topics as organizing messages like folders organize files.

3. Final Answer:

   To organize messages like folders organize files -> Option D

4. Quick Check:

   Topic = Organize messages [OK]

Hint: Topics group messages like folders group files [OK]

Common Mistakes:

• Confusing topics with databases
• Thinking topics store user data
• Mixing topics with program compilation

2. Which command correctly creates a Kafka topic named orders with 3 partitions and replication factor 2?

easy

A. kafka-topics.sh --create --topic orders --partitions 3 --replication-factor 2 --bootstrap-server localhost:9092

B. kafka-create-topic orders 3 2

C. create-topic --name orders --partitions 3 --replicas 2

D. kafka-topics.sh --new --topic orders --partitions=3 --replicas=2

Solution

1. Step 1: Identify correct Kafka topic creation syntax

   The official command uses kafka-topics.sh with --create, --topic, --partitions, --replication-factor, and --bootstrap-server options.

2. Step 2: Match options with correct syntax

   kafka-topics.sh --create --topic orders --partitions 3 --replication-factor 2 --bootstrap-server localhost:9092 matches the correct syntax exactly; others use wrong commands or options.

3. Final Answer:

   kafka-topics.sh --create --topic orders --partitions 3 --replication-factor 2 --bootstrap-server localhost:9092 -> Option A

4. Quick Check:

   Correct syntax = kafka-topics.sh --create --topic orders --partitions 3 --replication-factor 2 --bootstrap-server localhost:9092 [OK]

Hint: Use kafka-topics.sh with --create and proper flags [OK]

Common Mistakes:

• Using wrong command names
• Missing --bootstrap-server option
• Incorrect option names like --replicas

3. What will happen if you run this command?

kafka-topics.sh --create --topic sales --partitions 5 --replication-factor 1 --bootstrap-server localhost:9092

medium

A. Creates a topic named 'sales' with 1 partition and replication factor 5

B. Fails because replication factor cannot be 1

C. Creates a topic named 'sales' with 5 partitions and replication factor 1

D. Fails due to missing zookeeper connection

Solution

1. Step 1: Analyze command parameters

   The command specifies topic 'sales', 5 partitions, replication factor 1, and bootstrap server.

2. Step 2: Understand Kafka topic creation rules

   Replication factor 1 is valid (means no replicas), and partitions set to 5 means 5 partitions created.

3. Final Answer:

   Creates a topic named 'sales' with 5 partitions and replication factor 1 -> Option C

4. Quick Check:

   Partitions=5, Replication=1 [OK]

Hint: Replication factor 1 means no replicas, partitions as given [OK]

Common Mistakes:

• Confusing partitions with replication factor
• Assuming replication factor 1 is invalid
• Expecting zookeeper connection with bootstrap-server

4. You tried to create a topic with this command:

kafka-topics.sh --create --topic logs --partitions two --replication-factor 3 --bootstrap-server localhost:9092

What is the error?

medium

A. Missing --create flag

B. Invalid number for partitions: 'two' should be a number

C. Replication factor cannot be 3

D. Bootstrap server address is incorrect

Solution

1. Step 1: Check partitions parameter

   The partitions option expects a number, but 'two' is a word, causing a syntax error.

2. Step 2: Verify other parameters

   Replication factor 3 and bootstrap server are valid; --create flag is present.

3. Final Answer:

   Invalid number for partitions: 'two' should be a number -> Option B

4. Quick Check:

   Partitions must be numeric [OK]

Hint: Partitions must be numeric, not words [OK]

Common Mistakes:

• Using words instead of numbers for partitions
• Assuming replication factor 3 is invalid
• Forgetting --create flag

5. You want to create a Kafka topic for a critical system that must not lose messages and should handle high load. Which topic creation settings are best?

hard

A. Partitions: 10, Replication factor: 3

B. Partitions: 1, Replication factor: 1

C. Partitions: 5, Replication factor: 1

D. Partitions: 3, Replication factor: 2

Solution

1. Step 1: Understand requirements for critical system

   High load needs many partitions for parallelism; no message loss needs high replication factor.

2. Step 2: Evaluate options

   Partitions: 10, Replication factor: 3 has 10 partitions (high load) and replication factor 3 (high safety). Others have fewer partitions or lower replication.

3. Final Answer:

   Partitions: 10, Replication factor: 3 -> Option A

4. Quick Check:

   High load + safety = many partitions + high replication [OK]

Hint: More partitions + higher replication = speed + safety [OK]

Common Mistakes:

• Choosing low replication for safety
• Choosing few partitions for high load
• Ignoring replication factor importance