Learn about Apache Kafka and its ecosystem in 20 minutes.

What is Apache Kafka?

Learn how Kafka works, get a strong understanding of the different components

Kafka Fundamentals

Understanding Kafka

Starting Kafka

Learn how to use Kafka Command Line Interface (CLI)

Kafka CLI Tutorials

How to interact with Kafka programmatically?

Kafka Programming Tutorials

Practice using Kafka

Kafka Advanced Concepts

Series of advanced tutorials on important Kafka administration subjects

Kafka Administration

Next Level Kafka

Conduktor screenshot showing Kafka Consumer Group details

Kafka Consumer Group Details

Kafka Consumer Group Screenshot from Conduktor DevTools

Kafka Consumer Groups in Conduktor

Conduktor & Kafka Consumer Groups

CLI Extensions

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-first-application

Consumer group 'my-first-application' has no active members.

GROUP                TOPIC           PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG             CONSUMER-ID     HOST            CLIENT-ID
my-first-application first_topic     0          3               3               0               -               -               -
my-first-application first_topic     1          5               5               0               -               -               -
my-first-application first_topic     2          6               6               0               -               -               -

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group my-first-application --reset-offsets --to-earliest --execute --topic first_topic

GROUP                          TOPIC                          PARTITION  NEW-OFFSET
my-first-application           first_topic                    0          0
my-first-application           first_topic                    1          0
my-first-application           first_topic                    2          0

kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic first_topic --group my-first-application
third message
fifth message
seventh message
tenth message
first message
fourth message
eigth message
hello
world
second message
sixth message
ninth message

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-first-application

Consumer group 'my-first-application' has no active members.
GROUP                TOPIC           PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG             CONSUMER-ID     HOST            CLIENT-ID
my-first-application first_topic     0          3               3               0               -               -               -
my-first-application first_topic     1          5               5               0               -               -               -
my-first-application first_topic     2          6               6               0               -               -               -

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group my-first-application --reset-offsets --shift-by -2 --execute --topic first_topic

GROUP                          TOPIC                          PARTITION  NEW-OFFSET
my-first-application           first_topic                    0          1
my-first-application           first_topic                    1          3
my-first-application           first_topic                    2          4

kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic first_topic --group my-first-application
seventh message
tenth message
fourth message
eigth message
sixth message
ninth message

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-first-application

GROUP                TOPIC           PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG             CONSUMER-ID                                                          HOST            CLIENT-ID
my-first-application first_topic     0          3               3               0               consumer-my-first-application-1-0237b0a1-911d-45f1-891f-8fd7630a7593 /172.19.0.1     consumer-my-first-application-1
my-first-application first_topic     1          5               5               0               consumer-my-first-application-1-70ddc756-8dbc-45e4-b5b6-1e5a75db9e62 /172.19.0.1     consumer-my-first-application-1
my-first-application first_topic     2          6               6               0               consumer-my-first-application-1-a8ce2af3-97b3-4445-bba3-f4a5f6c4464d /172.19.0.1     consumer-my-first-application-1

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list --state
GROUP                STATE
my-first-application Stable

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --all-groups  --state

GROUP                     COORDINATOR (ID)          ASSIGNMENT-STRATEGY  STATE           #MEMBERS
my-first-application      127.0.0.1:9092 (1)        range                Stable          3

Note: 

$ kafka-consumer-groups.sh --bootstrap-server localhost:9092 --delete --group my-first-application
Deletion of requested consumer groups ('my-first-application') was successful.

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --delete-offsets --group my-first-application --topic first_topic
Request succeed for deleting offsets with topic first_topic group my-first-application

TOPIC                          PARTITION       STATUS
first_topic                    0               Successful
first_topic                    1               Successful
first_topic                    2               Successful

Learn to work with consumer groups in Kafka using CLI

Kafka Consumer Group Management CLI Tutorial

Apache Kafka CLI Tutorial for the management of consumer groups including resetting offsets, listing all consumers and deleting consumer groups.

Apache Kafka CLI tutorial showing how to auto reset offsets in a consumer group, list all consumers and delete consumer groups using the command line interface.