So today, after downgrading my master server to 10.4.7, I kept getting an error on my replica. So I decided to reset the replica by demoting it to a "Standalone" role, and then re-promoting it to the "Replica" role. But even after doing this, the error message persisted. The message was telling me to check the logs at:
and doing so did reveal errors like:
ERROR: Type or value exists: modify/add: memberUid: value #0 already exists
The solution was to again demote the replica to standalone status and then archive all the files in:
to anywhere else. I put them in a folder called "old." Just get 'em out of the way. Once this was done I was able to promote my replica without receiving error messages.
Yay! That wasn't too bad.
Oh, and you may be asking yourself how I knew to do this. Well, to be honest, I don't really remember. I just know that at some point in the past there was a problem I'd had with a replica and it was caused by stale files. So, since my ultimate goal was to start from scratch, I just got everything out of the way. And lo and behold. It worked. Sorry for the voodoo explanation, though. I wish I could be more explicit. Hell, I wish I fully understood what I was dealing with. But I don't. And, though it pains me to say this, I don't have time to figure it out.
But y'know? I'll take the cure even if I don't know what caused the disease.