I have a question in regards of what potential issues that might happen with a MySQL 5.1 DB that replicates from a MySQL 5.6 DB.
I know the risks involved based on resources such as http://dev.mysql.com/doc/refman/5.6/en/replication-compatibility.html and also http://serverfault.com/questions/262936/is-replication-from-mysql-5-5-master-to-a-5-1-slave-possible
However, this is a very special case because I am trying to replace the MySQL 5.1 DB with a 5.6 version, and the only way to have minimum downtime is to have a 5.6 DB set up first and then let it replicate from the 5.1 DB, which will in turn also replicate from the 5.6 DB to form a cyclic replication. The purpose of this is to ensure that during the switchover (when the 5.6 DB will be the active one receiving the live writes instead of the 5.1 ), no write data would be lost.
I was curious if anyone has ever had this kind of setup before with the 5.1 DB replicating from the 5.6 DB, and if there were any issues you encountered. I am not sure what SQL commands in the 5.6 DB could be problematic for the 5.1 DB during replication.
To be exact, the 5.6 version is 5.6.21 and the 5.1 version is 5.1.73
Thanks