It distributes a workload across a set of servers to maximize performance and optimize resource usage. HAProxy stands for High Availability Proxy, and is a great software-based TCP/HTTP load balancer. This tutorial will walk you through on how to deploy, configure and manage MySQL load balancing with HAProxy using ClusterControl. Another solution is to use a load balancer between the clients and the database cluster. For instance, a Galera donor node might be in read-only while it is helping another node resynchronize (if SST method is mysqldump or rsync) or it could be up in Non-Primary state if split-brain happens. However, in other clustering setup like Galera Cluster for MySQL or MariaDB, the JDBC and PHP drivers are not aware of internal Galera state information. The above database drivers are built to provide transparency for clients when connecting to standalone MySQL server, MySQL Cluster (NDB) or MySQL replication setups.
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