Checking mysql progress on startup with cluster
Mysql startup can take quite some time in a cluster setup, where it's net pretty obvious what mysql is doing. (At least, not visible with
journalctl -u mysql -f)
If it hangs with one CPU on 100% load, it's most likely scanning .ibd files.
You can verify this (and the progress) with
watch -n1 'lsof -n -p $(pidof mysqld) |grep var.*lib'