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Apache kafka
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=> Kafka is used as message broker (mediator).

=> Kafka is used as streaming platform.

=> Kafka is used for real-time data processing.

=> Kafka works based on pub-sub model.

	publisher : The application which stores msg in kafka.

	subscriber : The application which reads msg from kafka.

=> Kafka software is free and open source, developed by Apache org.

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Kafka usecases
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1) swiggy & zomoto orders processing

2) ola, uber and rapido cabs booking

3) Flights journey data processing


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Kafka Architecture
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1) Zookeeper (Provides runtime to run kafka server)

2) Kafka Server (Message Broker)

3) Kafka Topic (message queue, to store the messages)

4) Publisher Application (The appliation which sends msgs to kafka topic)

5) Subscriber Application (The application which recieves msgs from kafka topic)


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Apache Kafka Setup In Windows
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## Step-1 : Download Zookeeper from below URL

   URL : https://dlcdn.apache.org/zookeeper/zookeeper-3.9.2/apache-zookeeper-3.9.2-bin.tar.gz

## Step-2 : Download Apache Kafka from below URL

	URL : https://downloads.apache.org/kafka/3.8.0/kafka_2.12-3.8.0.tgz

## Step-3 : Set Path to ZOOKEEPER in Environment variables upto bin folder.

### Note: Copy "zookeeper.properties" and "server.properties" files from "kafka/config" folder to "kafka/bin/windows" folder. ###

## Step-4 : Start Zookeeper server using below command from "kafka/bin/windows" folder

    Command : zookeeper-server-start.bat zookeeper.properties

## Step-5: Start Kafka Server using below command from "kafka/bin/windows" folder

    Command : kafka-server-start.bat server.properties

Note: If kafka server is getting stopped, delete kafka logs from temp folder

## Step-6 : Create Kakfa Topic using below command from "kafka/bin/windows" folder

Command : kafka-topics.bat --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic ashokit_topic_1

## Step-7 : View created Topics using below command

   Command : kafka-topics.bat --list --bootstrap-server localhost:9092


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Kafka Bootstrap Server URL : http://localhost:9092/

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Publisher App : https://github.com/ashokitschool/spring_boot_kafka_producer.git

Subscriber App : https://github.com/ashokitschool/spring_boot_kafka_consumer.git

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