| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: pg_ctl promote wait |
| Date: | 2016-02-29 01:30:40 |
| Message-ID: | 56D39F40.4060802@gmx.net |
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| Lists: | pgsql-hackers |
On 2/19/16 3:09 PM, Tom Lane wrote:
> I see no need for an additional mechanism. Just watch pg_control until
> you see DB_IN_PRODUCTION state there, then switch over to the same
> connection probing that "pg_ctl start -w" uses.
Here is a patch set around that idea.
The subsequent discussion mentioned that there might still be a window
between end of waiting and when read-write queries would be accepted. I
don't know how big that window would be in practice and would be
interested in some testing and feedback.
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-pg_ctl-Add-tests-for-promote-action.patch | application/x-patch | 3.1 KB |
| 0002-pg_ctl-Detect-current-standby-state-from-pg_control.patch | application/x-patch | 2.8 KB |
| 0003-pg_ctl-Add-wait-option-to-promote-action.patch | application/x-patch | 5.8 KB |
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