Kafka CLI tools overview - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all Kafka topics.

Kafka

kafka-topics.sh --bootstrap-server localhost:9092 --[1]

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

Acreate

Bdescribe

Cdelete

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' instead of 'list' will try to create a topic.

Using 'delete' will remove topics, which is not intended here.

The --list option shows all topics in Kafka.

2fill in blank

medium

Complete the command to create a topic named 'my-topic' with 3 partitions.

Kafka

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

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

A3

B1

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 partitions is invalid and causes an error.

Using 1 partition creates only a single partition, not 3.

The --partitions option sets how many partitions the topic will have. Here, 3 is specified.

3fill in blank

hard

Fix the error in the command to describe a topic named 'orders'.

Kafka

kafka-topics.sh --bootstrap-server localhost:9092 --[1] orders

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

Adescribe

Bcreate

Clist

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'list' will show all topics, not details of one.

Using 'create' or 'delete' will change topics, not describe.

The --describe option shows details about a specific topic.

4fill in blank

hard

Fill both blanks to consume messages from 'my-topic' starting from the beginning.

Kafka

kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic my-topic --[1] --[2]

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

Afrom-beginning

Bgroup

Coffset

Dpartition

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'offset' or 'partition' options here is incorrect for this purpose.

Omitting the consumer group can cause unexpected behavior.

The --from-beginning option starts consuming from the start of the topic. The --group option sets the consumer group.

5fill in blank

hard

Fill all three blanks to produce a message 'Hello' to 'my-topic' using the console producer.

Kafka

echo "Hello" | kafka-console-producer.sh --bootstrap-server localhost:9092 --topic [1] --[2] [3]

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

Amy-topic

Bproperty

Cacks

Dretries

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'acks' with 'retries' changes message delivery guarantees.

Omitting '--property' causes the producer to use defaults.

The topic name is 'my-topic'. The --property option sets producer properties like acks which controls message acknowledgment.

Practice

1. Which Kafka CLI tool is used to create a new topic?

easy

A. kafka-topics.sh --create

B. kafka-console-producer.sh

C. kafka-console-consumer.sh

D. kafka-configs.sh

Solution

1. Step 1: Identify the tool for topic management

   The kafka-topics.sh tool is used to manage topics including creation, deletion, and listing.

2. Step 2: Confirm the create option usage

   Using --create with kafka-topics.sh creates a new topic.

3. Final Answer:

   kafka-topics.sh --create -> Option A

4. Quick Check:

   Topic creation = kafka-topics.sh --create [OK]

Hint: Topic creation always uses kafka-topics.sh with --create [OK]

Common Mistakes:

• Confusing producer or consumer tools for topic creation
• Using kafka-configs.sh which manages configs, not topics
• Omitting --create option

2. Which of the following is the correct syntax to start a Kafka console producer connecting to a server at localhost:9092?

easy

A. kafka-console-producer.sh --connect localhost:9092 --topic mytopic

B. kafka-console-producer.sh --broker-list localhost:9092 --topic mytopic

C. kafka-console-producer.sh --server localhost:9092 --topic mytopic

D. kafka-console-producer.sh --bootstrap-server localhost:9092 --topic mytopic

Solution

1. Step 1: Identify the correct option for specifying Kafka server

   Modern Kafka CLI tools use --bootstrap-server to specify the Kafka server address.

2. Step 2: Check the full command syntax

   The correct syntax includes kafka-console-producer.sh --bootstrap-server localhost:9092 --topic mytopic.

3. Final Answer:

   kafka-console-producer.sh --bootstrap-server localhost:9092 --topic mytopic -> Option D

4. Quick Check:

   Use --bootstrap-server for server address [OK]

Hint: Always use --bootstrap-server to specify Kafka server [OK]

Common Mistakes:

• Using deprecated --broker-list instead of --bootstrap-server
• Using incorrect flags like --server or --connect
• Omitting the --topic option

3. What will be the output of this command if the topic test-topic has 3 messages: kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test-topic --from-beginning --max-messages 2?

medium

A. It will print all 3 messages from test-topic and then exit.

B. It will print the first 2 messages from test-topic and then exit.

C. It will print no messages because --max-messages is ignored.

D. It will print only the last message from test-topic.

Solution

1. Step 1: Understand the --max-messages option

   The --max-messages 2 option limits the consumer to read only 2 messages before exiting.

2. Step 2: Analyze the command behavior

   The command reads from the beginning and stops after printing 2 messages, even though the topic has 3 messages.

3. Final Answer:

   It will print the first 2 messages from test-topic and then exit. -> Option B

4. Quick Check:

   --max-messages limits output count [OK]

Hint: --max-messages limits how many messages are consumed [OK]

Common Mistakes:

• Assuming all messages will be printed ignoring --max-messages
• Thinking --max-messages prints last messages only
• Confusing --from-beginning with consuming only latest messages

4. You run this command but get an error: kafka-console-producer.sh --topic mytopic. What is missing?

medium

A. The --bootstrap-server option specifying the Kafka server address.

B. The --create option to create the topic.

C. The --from-beginning option to read messages.

D. The --max-messages option to limit output.

Solution

1. Step 1: Identify required options for kafka-console-producer.sh

   The producer needs to know which Kafka server to connect to, specified by --bootstrap-server.

2. Step 2: Check the given command

   The command lacks --bootstrap-server, so it cannot connect and throws an error.

3. Final Answer:

   The --bootstrap-server option specifying the Kafka server address. -> Option A

4. Quick Check:

   Producer needs --bootstrap-server to connect [OK]

Hint: Always include --bootstrap-server to avoid connection errors [OK]

Common Mistakes:

• Assuming topic creation is automatic without --create
• Confusing producer options with consumer options
• Adding irrelevant options like --from-beginning for producer

5. You want to list all topics on a Kafka server at localhost:9092. Which command correctly lists the topics?

hard

A. kafka-console-producer.sh --list --bootstrap-server localhost:9092

B. kafka-console-consumer.sh --list --bootstrap-server localhost:9092

C. kafka-topics.sh --list --bootstrap-server localhost:9092

D. kafka-configs.sh --list --bootstrap-server localhost:9092

Solution

1. Step 1: Identify the tool for listing topics

   The kafka-topics.sh tool manages topics and supports the --list option to show all topics.

2. Step 2: Confirm the correct command syntax

   Using --bootstrap-server localhost:9092 specifies the Kafka server to connect to.

3. Final Answer:

   kafka-topics.sh --list --bootstrap-server localhost:9092 -> Option C

4. Quick Check:

   List topics with kafka-topics.sh --list [OK]

Hint: Use kafka-topics.sh with --list to see all topics [OK]

Common Mistakes:

• Using consumer or producer tools to list topics
• Omitting --bootstrap-server causing connection failure
• Using kafka-configs.sh which lists configs, not topics