Jim Nasby <jim.na...@bluetreble.com> writes:
> ISTM it should be possible to avoid sending full page writes to a 
> streaming replica once the replica has reached a consistent state. I 
> assume that the replica would still need to write full pages to it's 
> disk in case of a crash, but the sender could insert special WAL records 
> to tell it when to do so, instead of sending the full page image. 
> Presumably this would be a big win for replication over a WAN.

How are you going to make that work without LSNs in the WAL received by
the replica diverging from those in the master's WAL?

                        regards, tom lane

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