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With the use_sql_variables_in=master option, readwritesplit should route all user variable modifications and reads with user variables to the master. Previously, the modification of user variables was grouped into generic system variables which caused all modifications to system variables to go to the master only. The router requires a finer grained distiction between normal system variable modifications and user variable modifications. With the improvements to the query classifier, readwritesplit now properly routes all user variable operations to the master and other system variable modifications to all servers.
# MaxScale by MariaDB Corporation The MariaDB Corporation MaxScale is an intelligent proxy that allows forwarding of database statements to one or more database servers using complex rules, a semantic understanding of the database statements and the roles of the various servers within the backend cluster of databases. MaxScale is designed to provide load balancing and high availability functionality transparently to the applications. In addition it provides a highly scalable and flexible architecture, with plugin components to support different protocols and routing decisions. MaxScale is implemented in C and makes extensive use of the asynchronous I/O capabilities of the Linux operating system. The epoll system is used to provide the event driven framework for the input and output via sockets. The protocols are implemented as external shared object modules which can be loaded at runtime. These modules support a fixed interface, communicating the entries points via a structure consisting of a set of function pointers. This structure is called the "module object". The code that routes the queries to the database servers is also loaded as external shared objects and are referred to as routing modules. An Google Group exists for MaxScale that can be used to discuss ideas, issues and communicate with the MaxScale community. Email: maxscale@googlegroups.com Forum: http://groups.google.com/forum/#!forum/maxscale Bugs can be reported in the MariaDB Corporation bugs database: https://jira.mariadb.org/projects/MXS/issues # Documentation For information about installing and using MaxScale, please refer to the documentation. It is in Markdown format. You can point your browser to the MaxScale project at GitHub. Look inside the "Documentation" directory, where you will find a file named Documentation-Contents.md. Click on that, and GitHub will show the documentation in its intended display format. The contents page lists the available documents and has links to them. If you do not want to rely on the internet, then clone the project from GitHub and point your browser to the Documentation-Contents.md file in your local file system and proceed as above.