[카프카 명령어]
https://mongsil-jeong.tistory.com/42
https://www.conduktor.io/kafka/kafka-consumer-group-management-cli-tutorial
[consumer group]
https://www.popit.kr/kafka-consumer-group/
[nifi-kafka]
https://bryanbende.com/development/2016/09/15/apache-nifi-and-apache-kafka
(강추)
https://eyeballs.tistory.com/337
[performance]
https://sori-nori.gitlab.io/docs/how-to-choose-the-number-of-partition-in-a-kafka-cluster/