On 2017-03-30 19:40:08 +0100, Simon Riggs wrote: > On 30 March 2017 at 18:16, Andres Freund <and...@anarazel.de> wrote: > > >> /* > >> * Each page of XLOG file has a header like this: > >> */ > >> -#define XLOG_PAGE_MAGIC 0xD097 /* can be used as WAL version > >> indicator */ > >> +#define XLOG_PAGE_MAGIC 0xD100 /* can be used as WAL version > >> indicator */ > > > > We normally only advance this by one, it's not tied to the poistgres > > version. > > That was my addition. I rounded it up cos this is release 10. No biggie.
We'll probably upgrade that more than once again this release... > (Poistgres? Is that the Manhattan spelling?) Tiredness spelling ;) > We've been redesigning the mechanisms for 2 years now, so it seems > unlikely that further redesign can be required. I don't think that's true *at all* - the mechanism previously fundamentally different. The whole topic has largely seen activity shortly before the code freeze, both last time round and now. I don't think it's surprising that it thus doesn't end up being ready. > If it is required, > this patch is fairly low touch and change is possible later, > incremental development etc. As regards overhead, this adds a small > amount of time to a background process executed every 10 secs, > generates no new WAL records. > > So I don't see any reason not to commit this feature, after the minor > corrections. It doesn't have any benefit on its own, the locking model doesn't seem fully there. I don't see much reason to get this in before the release. - Andres -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers