Re: WAL replay bugs

On Tue, Apr 8, 2014 at 3:16 AM, Heikki Linnakangas
<hlinnakangas@vmware.com> wrote:
>
> I've been playing with a little hack that records a before and after image
> of every page modification that is WAL-logged, and writes the images to a
> file along with the LSN of the corresponding WAL record. I set up a
> master-standby replication with that hack in place in both servers, and ran
> the regression suite. Then I compared the after images after every WAL
> record, as written on master, and as replayed by the standby.
Assuming that adding some dedicated hooks in the core able to do
actions before and after a page modification occur is not *that*
costly (well I imagine that it is not acceptable in terms of
performance), could it be possible to get that in the shape of a
extension that could be used to test WAL record consistency? This may
be an idea to think about...
-- 
Michael