| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Petr Jelinek <petr(at)2ndquadrant(dot)com> |
| Cc: | Steve Singer <steve(at)ssinger(dot)info>, Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Jaime Casanova <jaime(at)2ndquadrant(dot)com> |
| Subject: | Re: tracking commit timestamps |
| Date: | 2014-11-07 19:53:37 |
| Message-ID: | 20141107195337.GB4510@alap3.anarazel.de |
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| Lists: | pgsql-hackers pgsql-www |
On 2014-11-07 17:54:32 +0100, Petr Jelinek wrote:
> On 06/11/14 08:50, Andres Freund wrote:
> >On 2014-11-05 19:31:52 -0500, Steve Singer wrote:
> >>It also doesn't allow you to load two extensions at once on a system.
> >>You wouldn't be able to have both the 'steve_commit_order' extension
> >>and BDR installed at the same time. I don't think this patch does a
> >>very good job at (B) but It wasn't intended to.
> >
> >Well, I don't agree that steve_commit_order makes much sense in this
> >context. But there actually is a real problem here, namely that there's
> >no namespacing in those bytes. I'd be ok with saying that we split the
> >extradata in for bytes for the namespace and four for the actual
> >data. That's roughly how it works for advisory locks already.
> >
>
> I am not sure how would this solve problem of 2 extensions using the
> extradata given that there can be only 1 record per txid anyway.
It'd help you to detect problems.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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