On Thu, Mar 14, 2019 at 1:23 AM Michael Paquier <michael@paquier.xyz> wrote:
On Wed, Mar 13, 2019 at 12:24:21PM +0100, Magnus Hagander wrote: > Enabling or disabling the checksums offline on the master quite clearly > requires a rebuild of the standby, there is no other way (this is one of > the reasons for the online enabling in that patch, so I still hope we can > get that done -- but not for this version).
I am curious to understand why this would require a rebuild of the standby. Technically FPWs don't update the checksum of a page when it is WAL-logged, so even if a primary and a standby don't agree on the checksum configuration, it is the timing where pages are flushed in the local instance which counts for checksum correctness.
Are you suggesting we should support running with a master with checksums on and a standby with checksums off in the same cluster? That seems.. Very fragile.
