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The `global` parameter causes the time window defined by the `time` parameter to be applied at the instance level instead of the session level. This means that a write from one connection will cause all other connections to use the master for a certain period of time. Using a configurable time window for consistency is not good as it is not absolute and cannot adjust to how servers behave. One example that demonstrates this is when a slave is normally lagging behind by less than a second but some event causes the lag to spike up to several seconds. In this case the configured time window would no longer guarantee consistency. Another reason to avoid a "static" time window is the fact taht it prevents load balancing in the cases where slaves catch up to the master within time window. This happens when time is configured to a higher value to avoid inconsistencies at all costs. Added a test case that verified the feature works.
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.