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When a readwritesplit session has a connection to a master server, servers of the same rank as the master are used. If no master connection is available, the server with the highest rank among all connected servers is used. If there are no open connections, the server with the best rank is chosen and a connection to it is made. Connections with different rank values than what is the current rank value of the session will be discarded. This reduces the use of server with different ranks when the master server of a session fails. Without the active pruning of connections, slave connections to primary clusters without masters would remain in use even after the primary master fails. This guarantees full switchover to a secondary cluster if a master change occurs.
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.
For a detailed overview of what MaxScale can do, read the MaxScale page on the MariaDB website.
An Google Group exists for MaxScale that can be used to discuss ideas, issues and communicate with the MaxScale community.
We're also on the #maria and #maxscale channels on FreeNode.
Please report all feature requests, improvements and bugs in the MariaDB Jira.
Getting Started
Read the Documentation Overview for a list of all MaxScale documents.
Documentation
The official documentation can be found on the MariaDB Knowledge Base.
A MaxScale Troubleshooting Guide can be found on the MariaDB Knowledgebase. It answers common questions encountered when installing and using MaxScale.
The documentation can also be found in the Documentation directory of the source tree.
Contributing Code
Read the Contributing page on the wiki for more information on how to do pull request and where to do them.