21eef8a670
The LocalClient micro-client required a reference to the session that was valid at construction time. This is the reason why the previous implementation used dcb_foreach to first gather the targets and then execute queries on them. By replacing this reference with pointers to the raw data it requires, we lift the requirement of the orignating session being alive at construction time. Now that the LocalClient no longer holds a reference to the session, the killing of the connection does not have to be done on the same thread that started the process. This prevents the deadlock that occurred when concurrect dcb_foreach calls were made. Replaced the unused dcb_foreach_parallel with a version of dcb_foreach that allows iteration of DCBs local to this worker. The dcb_foreach_local is the basis upon which all DCB access outside of administrative tasks should be built on. This change will introduce a regression in functionality: The client will no longer receive an error if no connections match the KILL query criteria. This is done to avoid having to synchronize the workers after they have performed the killing of their own connections.
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.