| From: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
|---|---|
| To: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Cc: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Simon Riggs <simon(dot)riggs(at)2ndquadrant(dot)com> |
| Subject: | Re: [PATCH] Send catalog_xmin separately in hot standby feedback |
| Date: | 2016-09-05 06:44:16 |
| Message-ID: | CAMsr+YE3sXwugFgP4beu8RMpBCPCnua1yMyN6Re5+59-YnXxeg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 5 September 2016 at 12:40, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:
> Hi all
>
> Currently hot standby feedback sends GetOldestXmin()'s result to the
> upstream as the required xmin. GetOldestXmin() returns a slot's
> catalog_xmin if that's the lowest xmin on the system.
Note that this patch changes the API to GetOldestXmin(), adding a new
boolean to allow it to disregard the catalog_xmin of slots.
Per Simon's feedback I'm going to split that out into a separate
patch, so will post a follow-up split one soon as the series.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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