The fs of choice for a database workload in centos 7 should be xfs because it's one of the defaults (specially in public clouds) and because it can be grown online. I suggest you add it.
so is ext4..
> and because it can be grown online
How this is different from how resize2fs can resize a mounted ext4 filesystem?
xfs may still be better than ext4 for some workloads, but "it's there" is not a reason why someone should use it.