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Apache kafka
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=> Kafka is a free 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.

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Kafka usecases
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1) zomoto orders processing
2) swiggy orders processing
3) ola rides booking process
4) rapido rides booking process

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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 (A place to store msgs)
4) Publisher App (The application which sends msg to topic)
5) Subscriber App (The application which reads msgs from 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

## 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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