Hi,

The colocated backup servers for shared store approach is to set up a backup
server which basically read the messages that are written by another
instance of live server. 

instance #1(master.1 + slave.1)
instance #2 (master.2 + slave.2)

Where the directory of slave.1 is the same as that of master.2. This will
allow instance#1 to get unprocessed messages from instance#2 when instance#2
has shut down, and vise versa.

Normally when you set up data replication, you would set one instance as
master, and another instance as slave.

I am working on a project that needs me to set up HA for messaging with data
replication, and it looks like I am running into issues with the normal
setup.

What is the deal of setting up colocated backup servers for data replication
approach? 
What are the use cases which we need to set up collocated backup?
How to set it up?

Thanks

Wayne



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