Comments - Setting Up Replication
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"...and must be unique for each server in the replicating group." what is replicating group? all servers which take part into replication?
Not exactly. Imagine each group as a server, plus the servers (masters, slaves) that DIRECTLY communicate with the first server. Within such groups, id's must be unique.
The followind replication topography is ok:
id1 -> id:2 -> id:3 -> id:1
But of course it is a bad practice.