Percona 5.5 to MySQL 5.5 Rollback

MySQL & MariaDB Other MySQL® Questions
1

We are evaluating Percona Server 5.5 and results are interesting. I have upgraded one of our slave from MySQL 5.1.56 to Percona Server 5.5 . It was a drop-in replacement of data files and mysql_upgrade command. Every thing is running fine .

Is migration from Percona to MySQL is possible, if yes
what is the procedure to Roll back to MySQL 5.5 from Percona Server 5.5 ? (If in case we need to do that in future) .

Thanks

2

Test it!

Going back is possible, unless you use features that break compatibility (innodb_extra_undoslots). Just install MySQL (same or newer, with mysql_upgrade being run in the latter case) and make it use the same data folder.

3

we are using features like innodb_extra_undoslots, how will we do rollback …