so to sum it up short, create table, copy data, rename table. isnt this already tackled by tools created by percona and many others out in market? other than them adding in hadoop to speed things up, what else is new here?
A lot of migrations would be pretty trivial if you could have even a couple hours of downtime, but in an expectation of 24/7 availability that is no longer acceptable in most situations.
Here they were modifying the data. But yes, it works the same way, and it's not really novel in any way.