ProxySQL 2.3.0 was recently released and when I was reading the release notes, I was really impressed with the Group Replication enhancements and features. I thought of experimenting with those things and was interested to write a blog about them. Here, I have focused on the following two topics:
- When the replication lag threshold is reached, ProxySQL will move the server to SHUNNED state, instead of moving them to OFFLINE hostgroup. When shunning a server, it will be performed gracefully and not immediately drop all backend connections.
- The servers can be taken to maintenance through ProxySQL using “OFFLINE_SOFT”.
To test this, I have configured a three-node GR cluster (gr1,gr2,gr3) in my local environment. I have configured a single primary cluster (1 writer, 2 readers).
mysql> select member_host,member_state,member_role,member_version from …[Read more]