I'm stuck with one specificity of Replication on MySQL servers.
I'm currently working with this configuration :
A <--> B
⊦---> C ---> D
I've got a replication Master <--> Master between servers A & B. This replication is working for years now and everything is fine with it.
I also managed to build a replication between server C & D which needs to have GTID activated (necessity of external replication with Google Cloud SQL).
But I cannot activate the replication between server A and C because C has GTID activated and A is currently with GTID disabled.
By the way, I've got differences of version between my servers. A & B are MySQL 5.5 and just some tables are replicated C & D are MySQL 5.6 (and perhaps 5.7 if it is possible).
I cannot actually upgrade A & B from 5.5 to 5.6, neither can I halt and activate GTID on A & B.
Is there a way to ignore the GTID configuration for the Master (A) -> Slave (C) but maintain the GTID configuration for Master (C) -> Slave (D) configuration ?
Thanks for your advices.