Re: [Postgres-xc-developers] gtm output

[Koichi S. <koi...@gm...>]

Yes, we have a similar problem using gtm_ctl with ssh.   And this
happens in pg_ctl as well.

ssh hostxx pg_ctl start -Z coordinator -D somedirs

won't return either.   As you suggested, we have to redirect
stdout/stderr explicitly.

I think I can fix this problem for gtm_ctl by taking care of
stdout/stderr.   But I don't think I should do the same thing to
pg_ctl.

Regards;
----------
Koichi Suzuki


2013/1/9 Nikhil Sontakke <ni...@st...>:
> Hi Suzuki-san,
>
>
>
>>
>> 1. i=$(pg_ctl start -Z coordinator -D ./coord) does not return.
>> gtm_ctl behaves similarly as pg_ctl.
>
>
> Yeah, that seems to be the case with latest PostgreSQL as well.
>
> However, one difference is if you just use the command without assigning
> into a variable in a shell script. Like:
>
> cat /tmp/h.sh
>
> ./install/bin/pg_ctl -D install/data start
> echo "done"
>
> The above shell script exits properly.
>
> However the use of gtm_ctl similarly does not cause the script to exit and
> that's the problem.
>
> Regards,
> Nikhils
>>
>> 2. I inserted setsid() to gtm code and ran i=$(gtm_ctl start -Z gtm -D
>> ./gtm).  It didn't return.   No improvement so far.
>> 3. In addition to 2, I added codes to close both stdout and stderr
>> before setsid().   This worked well.
>>
>> I think the issue you reported is common to pg_ctl.   Setsid() has
>> nothing to do with stdout/stderr handling at daemonization.  Of
>> course, you can detach stdout/stderr from tty as Nikhil reported.
>>
>> So I'd like inputs on whether gtm_ctl start should return, which is
>> different from pg_ctl.
>>
>> I think similar behavior of gtm_ctl to pg_ctl is acceptable.
>>
>> Regards;
>> ----------
>> Koichi Suzuki
>>
>>
>> 2012/12/6 Michael Meskes <me...@po...>:
>> > Hi,
>> >
>> > any idea why gtm_ctl hangs when its output get redirected into a
>> > variable like
>> > this?
>> >
>> > i=$(/usr/bin/gtm_ctl start -D /var/lib/postgres-xc/gtm -Z gtm)
>> >
>> > Looks like a problem with output device handling. gtm is indeed started
>> > correctly. Same kind of redirection works nicely with other commands
>> > like
>> > pg_ctl. I don't feel like debugging gtm right now, maybe you guys know.
>> >
>> > Michael
>> > --
>> > Michael Meskes
>> > Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
>> > Michael at BorussiaFan dot De, Meskes at (Debian|Postgresql) dot Org
>> > Jabber: michael.meskes at gmail dot com
>> > VfL Borussia! Força Barça! Go SF 49ers! Use Debian GNU/Linux, PostgreSQL
>> >
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