Re: Libpq support to connect to standby server as priority

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: vignesh C <vignesh21(at)gmail(dot)com>
Cc: Greg Nancarrow <gregn4422(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru>, Peter Smith <smithpb2250(at)gmail(dot)com>, "Smith, Peter" <peters(at)fast(dot)au(dot)fujitsu(dot)com>, David Steele <david(at)pgmasters(dot)net>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)fujitsu(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Dave Cramer <pg(at)fastcrypt(dot)com>, Jing Wang <jingwangian(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Elvis Pranskevichus <elprans(at)gmail(dot)com>
Subject: Re: Libpq support to connect to standby server as priority
Date: 2021-03-03 18:54:18
Views: Raw Message | Whole Thread | Download mbox | Resend email
Lists: pgsql-hackers

I wrote:
> vignesh C <vignesh21(at)gmail(dot)com> writes:
>> Conchuela is failing because of:
>> ok 17 - connect to node standby_1 if mode "standby" and standby_1,primary
>> listed
>> ack Broken pipe: write( 13, 'SHOW port;' ) at
>> /usr/local/lib/perl5/site_perl/IPC/Run/ line 549.

> It didn't fail on the next run, so this might just be a phase-of-the-moon
> glitch. Conchuela is a bit prone to that sort of thing, in my experience.
> We'll have to wait and see if it's at all repeatable.

Conchuela hasn't shown it again, but it turns out to be repeatable
on my old warhorse gaur. After a bit of study I see the problem:
we're asking Perl to write to the stdin of a psql process that
may not be there to receive the data. We've dodged that issue
in other tests by passing "undef" as the stdin to sub psql, so
that's what I did here.

regards, tom lane

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Tom Lane 2021-03-03 19:16:43 Re: Catalog version access
Previous Message Pavel Stehule 2021-03-03 18:16:47 Re: proposal - psql - use pager for \watch command