I also encountered cases “query cache is not supported” error in your MySQL, like Phoenix128
A good idea maybe someone will help me. Thank you all.
Query Cache can be enabled now since recent PXC 5.6.15:
But really, are you sure it’s beneficial for you?
Also, if you need a separate node from the cluster - you can set one of the existing nodes as a asynchronous master to a non-PXC slave replica.