Re: Avoid full page images in streaming replication?

Jim Nasby <Jim.Nasby@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