README.md

kafka-demo

Download Kafka Binary

Download Kafka binary files from https://kafka.apache.org/downloads (This repo uses 2.6.0). Unzip file and keep the confif/ directory, which will be used by brew version Kafka. Shell scripts in bin/ are binary executables for Kafka, which can be used instead of brew Kafka.

If use binary instead of brew, expose the path, add the following startup file (e.g. .bash_profile, .zshrc)

export PATH=$PATH:{path_to_kafka_bin}/kafka_2.13-2.6.0/bin

Installation

brew install kafka

Start Kafka

Start Zookeeper Server

zookeeper-server-start config/zookeeper.properties

Zookeeper server binds to port 2181 by default

Start Kafka Server

kafka-server-start config/server.properties

Kafka server binds to port 9092 by default

Kafka CLI

Topic

kafka-topics --zookeeper localhost:2181
kafka-topics --zookeeper localhost:2181 --create --topic first_topic --partition 3 --replication-factor 1
kafka-topics --zookeeper localhost:2181 --list
kafka-topics --zookeeper localhost:2181 --topic first-topic --describe
kafka-topics --zookeeper localhost:2181 --topic first-topic --delete

Note replication-factor needs to be smaller or equal to the number of broker

Producer

kafka-console-producer --broker-list localhost:9092 --topic first_topic
kafka-console-producer --broker-list localhost:9092 --topic first_topic --producer-property acks=all

Consumer

kafka-console-consumer --bootstrap-server localhost:9092 --topic first_topic
kafka-console-consumer --bootstrap-server localhost:9092 --topic first_topic --from-beginning
kafka-console-consumer --bootstrap-server localhost:9092 --topic first_topic --group group-A

Consumer Groups

kafka-consumer-groups --bootstrap-server localhost:9092 --list
kafka-consumer-groups --bootstrap-server localhost:9092 --describe --group group-A
kafka-consumer-groups --bootstrap-server localhost:9092 --group group-A --topic first_topic --reset-offsets --to-earliest --execute