kafka-exercise-Using-Custom-Keys.md

Exercise: Using Custom Keys

Write a new Kafka application CustomClassForKeyDemo (using Kafka Producer API) as follows:

1. Write a custom class with two properties, e.g. instID and empID
   1. case class InstEmp
2. Implement a custom Serializer for the class
   1. Read Serializer
   2. class InstEmpSerializer extends Serializer
3. Write a Kafka producer that uses the class for keys and the serializer
   1. Use ProducerConfig.KEY_SERIALIZER property to register the serializer
   2. Use InstEmp for the keys of ProducerRecord objects (and any type for values)
4. Use kafka-console-consumer to print out the records

Duration: 30 mins