During on-site engagement, I installed master-slave configuration with MaxScale v2.3 on top of master node.
OS: CentOS 7.4.1708
MariaDB: v10.4.8
MaxScale: v2.3.11
Customer is using GTID to utilize auto failover of MaxScale and HA test has been done successfully.
But when I tried to shutdown mariadb server it failed with timeout.
I tried
$ systemctl stop mysql
and
$ mysqladmin shutdown and the result is the same.
The last error log is follows..
...
[Note] Slave I/O thread: connected to master 'xxx@xxxx:3306', replication starts at GTID position '0-1000-382'
----------------------------------------------
So If I stop the slave with "mysql> stop slave;" and then tried to stop the mariadb server, it stops immediately.
It looks like shutdown never stops "Slave I/O thread"... and got timeout.
Is it a known issue of v10.4.8 or any OS setting dependancies ?
FYI. innodb-thread-concurrency is set to 0.
Thanks
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