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Before these changes when max_sescmd_history was used the session was closed when the limit was exceeded. With this change, when the limit is exceeded the recovery of slaves and the session command history are both disabled. This will allow the sessions to continue while still keeping the old functionality of limited salve replacement. The disable_sescmd_history and disable_slave_recovery parameters were combined so that disabling the session command history will also disable slave recovery. This way no harm can be done with disable_sescmd_history.
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. Send email to maxscale@googlegroups.com or use the forum interface
Bugs can be reported in the MariaDB Corporation bugs database https://mariadb.atlassian.net/projects/MXS/issues
Documentation
For information about installing and using MaxScale, please refer to the documentation.