Kafka CLI tools overview - Step-by-Step Execution

Process Flow - Kafka CLI tools overview

Start Kafka CLI

↓

Choose Tool

↓

Producer

↓

Send Msg

↓

Show Output

↓

End

This flow shows how you start Kafka CLI, pick a tool (producer, consumer, admin), perform actions, and see results.

Execution Sample

Kafka

kafka-console-producer --topic test
kafka-console-consumer --topic test --from-beginning
kafka-topics --list

These commands send messages, read messages, and list topics using Kafka CLI tools.

Process Table

Step	Command	Action	Result/Output
1	kafka-console-producer --topic test	Start producer to send messages	Ready to accept input for topic 'test'
2	Type 'Hello Kafka'	Send message to topic	Message 'Hello Kafka' sent
3	kafka-console-consumer --topic test --from-beginning	Start consumer to read messages	Reads messages from beginning of 'test'
4	Consumer outputs message	Display received message	'Hello Kafka' displayed
5	kafka-topics --list	List all topics	Shows list including 'test'
6	Exit	Stop CLI tools	CLI session ends

💡 User ends session or stops CLI tools

Status Tracker

Variable	Start	After Step 2	After Step 4	Final
Message Input	empty	'Hello Kafka'	'Hello Kafka'	session ended
Topic List	unknown	includes 'test'	includes 'test'	session ended

Key Moments - 3 Insights

Why does the consumer show messages only after starting it?

Because the consumer reads messages from the topic when it starts, as shown in step 3 and 4 in the execution_table.

What happens if you send a message before starting the consumer?

The message is stored in the topic and will be read when the consumer starts, as the consumer reads from the beginning (step 3).

How do you know which topics exist?

Using the kafka-topics --list command (step 5) shows all topics including the one used.

Visual Quiz - 3 Questions

Look at the execution_table, what is the output after step 2?

A Message 'Hello Kafka' sent

B Ready to accept input

C 'Hello Kafka' displayed

D Shows list including 'test'

💡 Hint

Check the 'Result/Output' column for step 2 in execution_table

At which step does the consumer start reading messages?

A Step 1

B Step 5

C Step 3

D Step 6

💡 Hint

Look at the 'Action' column in execution_table for when consumer starts

If you run kafka-topics --list after sending messages, what changes in variable_tracker?

A Message Input changes

B Topic List includes 'test'

C Message Input becomes 'Hello Kafka'

D No change in Topic List

💡 Hint

Refer to 'Topic List' row in variable_tracker after step 5

Concept Snapshot

Kafka CLI tools let you interact with Kafka from the command line.
Use kafka-console-producer to send messages.
Use kafka-console-consumer to read messages.
Use kafka-topics to manage topics.
Start tools, perform actions, see output, then exit.

Full Transcript

This visual execution shows how Kafka CLI tools work step-by-step. First, you start the producer to send messages to a topic. Then, you start the consumer to read messages from that topic. You can also list topics using the admin tool. Each step shows the command, what it does, and the output you see. Variables like message input and topic list change as you send and read messages. Key moments explain why the consumer reads messages only after starting and how to check existing topics. The quiz tests your understanding of these steps and outputs.