Merge branch 'omd_notification_branch' into 'master'

Setup Kafka & Broker - Initial Setup of Kafka with Topic, Broker, Replication,...

See merge request !4

omd-notifications/src/main/resources/OMD_Notification_Kafka_Setup_Details

+OMD-Notification-Kafka-Configuration-Details:
+—————————————--------------------------------
+1. Kafka Installation Process on Mac OS:
+
+	a) Downlaod:
+
+ 		1) https://kafka.apache.org/downloads
+
+ 		2) Scala 2.12  - kafka_2.12-2.4.1.tgz 
+
+
+       b) Configuration:
+
+		1) Extract to Desired Location.
+			(My Local Location: /Users/preddy/Documents/Kafka-Tutorial/Kafka_Learning_udemy/kafka_2.12-2.4.1/bin)
+
+		2)  Use following commands to set the Class path to bash.profile file.
+			-> cat ~/.bash_profile to check the existed class path settings
+			-> nano ~/.bash_profile to update the class path settings
+			-> Set the class path as:
+				export PATH ="$PATH:/Users/preddy/Documents/Kafka-Tutorial/Kafka_Learning_udemy/kafka_2.12-2.4.1/bin"
+			-> Save and Exit
+
+		3)  Check the Kafka installation by running the command :
+			-> Kafka-Topics
+
+		4)  Create a folder “data >> zookeeper” in Kafka root directory.
+
+		5)  Create a folder “data>>Kafka” in Kafka root directory.
+
+		6)  Update “dataDir” value in zookeeper.properties with data>>zookeeper directory path.
+			(Ex. dataDir=/Users/preddy/Documents/Kafka-Tutorial/Kafka_Learning_udemy/kafka_2.12-2.4.1/data/zookeeper) to check the data
+
+		7)  Update “log.dir” in server.properties with data>>Kafka directory path.
+			(Ex. log.dirs=/Users/preddy/Documents/Kafka-Tutorial/Kafka_Learning_udemy/kafka_2.12-2.4.1/data/kafka)
+
+
+2. CLI Commands To Create Topic, Run Broker, Zookeeper:
+
+	a) Start Zookeeper :
+		—> zookeeper-server-start config/zookeeper.properties (from root folder)
+		—> binding to port 0.0.0.0/0.0.0.0:2181 (This is the confirmation for zookeeper start and 2181 is the default port for zookeeper)
+
+
+	b) Start Kafka Server ( i.e. Broker) :
+		—> Kafka-server-start config/server.properties (from root folder)
+		—> [KafkaServer id=0] started (kafka.server.KafkaServer) (This is the confirmation for Kafka server started successfully)
+
+
+	c) Create Topic with Replicas and Partitions :
+		--> kafka-topics --bootstrap-server localhost:9092 --topic TOPIC_OMD_ORDER_DATA --create --partitions 3 --replication-factor 1
+		—>  To Check the details of Topic and Partitions :
+				kafka-topics --bootstrap-server localhost:9092 --topic TOPIC_OMD_ORDER_DATA --describe