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MySQL Group Replication: what are those UDFs ?

To operate more easily a MySQL Group Replication (InnoDB Cluster), the Group Replication plugins provides some UDFs. If you have read the recent article from Tiago Vale about the Group Replication Communication Protocol, you may have heard about two new UDFs allowing to get or set  the communication protocol. So what are all the UDFs provided with the Group Replication … Read More


Group Replication: A member in “RECOVERING” state is part of the primary partition

If you are using MySQL InnoDB Cluster (Group Replication) with ProxySQL, you should be familiar with the 2 functions and 1 view required in SYS Schema that ProxySQL uses to see if a node is online, partitioned or not, and if it’s lagging or not (see link1 and link2). I received recently a very valuable contribution from Bruce DeFrang that … Read More


MySQL InnoDB Cluster & Group Replication: how to upgrade safely your cluster

Recently on MySQL Forums, somebody was looking for documentation or procedure to upgrade a MySQL InnoDB Cluster (or Group Replication cluster) to a newer version. In this post I am illustrating the best practices to achieve this task safely.


MySQL Group Replication: read your own write across the group

Today is my last day in Asia (China and Taiwan), and between the sessions I had the time to code a small proof-of-concept for people that are asking how they could read their writes on all nodes and ensure the read consistency with their last write ? The usual (and easier) answer to this particular question is to read on … Read More


MySQL Group Replication: who is the primary master – updated!

Some time ago I wrote this article explaining how to find which node was the Primary Master in a MySQL Group Replication cluster running in Single-Primary Mode. In the latest release of Group Replication, MySQL 8.0.2 dmr, Jaideep improved the visibility of Group Replication extending the performance_schema tables (see his article). Thanks to these improvements, it’s now very easy to … Read More


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