It is very, very common to have asynchronous replication. I would say
the need for synchronous is far more limited (although greater desired).
I would imagine that multi-master synchronous replication would be
fairly trivial to implement with 2PC and wal-shipping available, no?
Trivial? I would say... no. There is a reason it hasn't been done yet,
and a reason why CMD (for example) has zero plans to even try.
Sincerely,
Joshua D. Drake
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