DISCLAIMER : MySQL Fabric is new to me so I cannot say much.
Notwithstanding, the FAQ for MySQL Fabric says the following:
8.7.8: Is the MySQL Fabric node itself fault tolerant? What happens when the MySQL Fabric node is not available?
There is currently only a single instance of the MySQL Fabric node. If that process should fail then it can be restarted on that or another machine and the state and routing information read from the existing state store (a MySQL database) or a replicated copy of the state store.
While the MySQL Fabric node is unavailable, Fabric-aware connectors continue to route queries and transactions to the correct MySQL Servers based on their cached copies of the routing data. However, should a Primary fail, automated failover will not happen until the MySQL Fabric node is returned to service and so it's important to recover the process as quickly as possible.
In contrast, MySQL Cluster has the technology to allow multiple management nodes. You will have to look for multiple-instance usage of MySQL Fabric in future releases. That would have to be on Oracle's roadmap.
VERY WILD SUGGESTION
If you use VMWare or Amazon EC2, you need to make an OS instance with the following:
- MySQL Fabric installed
- MySQL Fabric configure to see all MySQL Servers
Then, clone the VM multiple times and spin up an instance on demand.
It is not best practice to attach directly to a Master in a MySQL Fabric farm. Why? Suppose MySQL Fabric comes back and elects another MySQL Server to be the new Master. If the Master you are attached to becomes a Slave, MySQL Fabric could possibly make the Master become read-only. This may also confuse MySQL Fabric because it may not be aware of your independent usage of the Master. In essence, you will rip the Fabric and have to sew it all back together then.
UPDATE 2016-03-18 18:20 EDT
I tried out MySQL Fabric for a week and quickly learned something. There are intermittent times when the Fabric node dies. You can simply kill the Fabric service and start it back again. I already mentioned in from the Documentation, but I actually saw it in practice. Fabric-aware connectors do indeed work but DO NOT LET THE FABRIC NODE STAY DEAD FOR LONG.