| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Florian Pflug <fgp(at)phlo(dot)org>, Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>, Greg Smith <greg(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com> |
| Subject: | Re: Stefan's bug (was: max_standby_delay considered harmful) |
| Date: | 2010-05-24 13:26:12 |
| Message-ID: | AANLkTikgXQ2ofUTp3FdsAawOuqtUxkUQ5TGF6sWJky90@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, May 24, 2010 at 1:27 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> On Wed, May 19, 2010 at 2:47 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>>>> Oh, right. How about allowing the postmaster only in PM_STARTUP,
>>>> PM_RECOVERY, PM_HOT_STANDBY or PM_WAIT_READONLY state to invoke
>>>> walreceiver? We can keep walreceiver alive until all read only
>>>> backends have gone, and prevent unexpected startup of walreceiver.
>>>
>>> Yes, that seems like something we should be checking, if we aren't already.
>>
>> I'll do that.
>
> Here is the updated version. I added the above-mentioned check
> into the patch.
This looks pretty reasonable to me, but I guess I feel like it would
be better to drive the CancelBackup() decision off of whether we've
ever reached PM_RUN rather than consulting XLogCtl. It just feels
cleaner to me to drive all of the postmaster decisions off of the same
signalling mechanism rather than having a separate one (that only
works because it's used very late in shutdown when we theoretically
don't need a lock) just for this one case.
I could be all wet, though.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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