codership-mysql MySQL patches by Codership
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MySQL replication patches MySQL patch Codership replication

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MySQL patches by Codership codership-mysql contains write set replication patches for MySQL maintained by Codership team.This patch implements hooks inside MySQL/Innodb engine, which can be used to build external replication system for MySQL servers. The replication system built on these hooks can be asynchronous or synchronous and have single or multi-master support.The replication hooks provide management of transaction write sets:* populating of write sets, in the sending side* applying of write sets, in the receiving endThe applying happens by high priority transaction(s). Innodb lock manager has been modified to give preference to dedicated high priority MySQL threads.There are also calls for providing "total order isolated" processing of certain SQL statements. This feature guarantees that each MySQL server in the cluster process the SQL statement in the same order and uninterrupted. .e.g. all DDL statements need to be processed isolated, to maintain data consistency in the cluster. What's New in This Release: · This relase comes only with the new gcomm group communication system, vsbes has been dropped. gcomm runs as part of mysqld process, and does not need a separate process to be started. Read the README file for instructions how to configure gcomm. · During Q/A testing, we found two known issues, which were not fixed for this release. They deal with DDL/DML concurrency under high load and intermittent problem to shutdown gracefully. · These issues have been filed as bugs and targeted for 0.7.1 release.

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