ProxySQL in AWS-land

 ProxySQL is a GNU GPL licensed MySQL proxy middleware that sits between a MySQL database and the clients. ProxySQL is a high-performance SQL proxy. The proxy is designed to run continuously without needing to be restarted. It provides support for Aurora MySQL

The article will go through some essential ProxySQL + Aurora information

GaleraDB pretends to be in sync after a failed alter table on a node

The MariaDB Galera cluster is a master-master solution that provides High Availability, resilient and very good performance. 

It keeps continuously the nodes all in sync for transactions. If you experience an issue with Run out of disk space you may be able to solve your problem by following these steps