I can't speak for number one and maybe off on number two.
In my experience they do support it in the sense that they support HUE HA with two MySQL DBs in active<>active and they support CM HA. As far as I know they do not directly support it, as in, if there is an issue with it they will not help fix it (but I may be wrong).
Thanks for the reply. I just wonder if the at least support some type of replication. And, by "support", I don't mean that Cloudera will fix an issue...but more that their software/cluster will work with MySQL replication.
Or, based on this statement from the Cloudera doc "Cloudera Manager installation fails if GTID-based replication is enabled in MySQL" , maybe they mean that installing Cloudera Manager on a MySQL db that already has GTID-based replication will fail...but that you can install CM and then implement GTID replication later?
Guess I'll need to see if someone from Cloudera can confirm.