Comments - Upgrading from MariaDB 10.1 to MariaDB 10.2
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I'm stuck on Step 2 shutting down for a few hours now. There should probably be some kind of warning in step 2 about this.
Every minute, the mysql/error.log emits a message like:
InnoDB: number of bytes of change buffer just merged: 18433
The number changes a bit but not much each time.
I can't query the database's system variables to discover the size of the change buffer so I can't estimate how long it's going to take.
The change buffer defaults to 25% of the buffer pool size which defaults to 128M.
Are my sites going to be down for >24 hours? That's what the default arithmetic says.