e840f92cbb
The query_classifier library is now only a wrapper that loads an actual query classifier implementation. Currently it is hardwired to load qc_mysqlembedded, which implements the query classifier API using MySQL embedded. This will be changed, so that the library to load is specified when qc_init() is called. That will then allow the query classifier to be specified in the config file. Currently there seems to be a conflict between the mysql_library_end() call made in qc_mysqlembedded and the mysql_library_end() call made in gateway.c. The reason is that they both finalize a shared library. For the time being mysql_library_end() is not called in gateway.c. This problem is likely to go away by switching from the client library to the connector-c library.
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.