Kafka, SPARK, streaming, and JSON references

https://docs.confluent.io/current/quickstart.html

https://spark.apache.org/docs/latest/streaming-programming-guide.html

https://spark.apache.org/docs/latest/streaming-kafka-integration.html

http://kafka.apache.org/documentation.html

https://spark.apache.org/docs/2.2.0/streaming-kafka-0-8-integration.html

https://www.cloudera.com/documentation/kafka/latest/topics/kafka_command_line.html
-substitute localhost for the .com domain name in the examples