Mysql clustering

https://shazi.info/%E6%9E%B6%E8%A8%AD-ha-%E9%AB%98%E5%8F%AF%E7%94%A8%E6%80%A7%EF%BC%9Amysql-cluster-%E5%8F%A2%E9%9B%86-7-4-115-6-29/

http://stackoverflow.max-everyday.com/2017/10/mysql-for-commercial/

http://www.clusterdb.com/mysql-cluster/using-clusterjpa-part-of-mysql-cluster-connector-for-java-a-tutorial