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
Recently, my friend Marco Tusa(MySQL Daddy or the Grinch) wrote his first impression on MySQL Group Replication (part of InnoDB Cluster). And his conclusion was not that positive. But when I analyze his setup, I understand that his assumptions were not so right. Let's try to explain what were the issues and why his test wasn't correct. Before commenting Marco's … Read More
As you may know by now, MySQL 8.0.2 DMR is out ! \o/ Many features have been added (see Geir Høydalsvik‘s announcement) and of course the replication also brought new features and improvements (see this post from Luís Soares). But some improvements in the monitoring broke the added sys view used by ProxySQL to monitor the state of a member … Read More
When using MySQL Group Replication, it’s possible that some members are lagging behind the group. Due to load, hardware limitation, etc… This lag can become problematic to keep good certification behavior regarding performance and keep the possible certification failure as low as possible. Bigger is the applying queue bigger is the risk to have conflicts with those not yet applied … Read More
MySQL InnoDB Cluster (or only Group Replication) becomes more and more popular. This solution doesn’t attract only experts anymore. On social medias, forums and other discussions, people are asking me what it the best way to migrate a running environment using traditional asynchronous replication [Master -> Slave(s)] to InnoDB Cluster.