[Pacemaker] Shouldn't colocation -inf: be mandatory?

[Dejan Muhamedagic]

Hi,

On Tue, Jun 15, 2010 at 10:57:47AM +0200, Andrew Beekhof wrote:
> On Tue, Jun 15, 2010 at 10:23 AM, Andreas Kurz <andreas.kurz at linbit.com> wrote:
> > On Tuesday 15 June 2010 08:40:58 Andrew Beekhof wrote:
> >> On Mon, Jun 14, 2010 at 4:22 PM, Vadym Chepkov <vchepkov at gmail.com> wrote:
> >> > On Jun 7, 2010, at 8:04 AM, Vadym Chepkov wrote:
> >> >> I filed bug 2435, glad to hear "it's not me"
> >> >
> >> > Andrew closed this bug
> >> > (http://developerbugs.linux-foundation.org/show_bug.cgi?id=2435) as
> >> > resolved, but I respectfully disagree.
> >> >
> >> > I will try to explain a problem again in this list.
> >> >
> >> > lets assume you want to have several resources running on the same node.
> >> > They are independent, so if one is going down, others shouldn't be
> >> > stopped. You would do this by using a resource set, like this:
> >> >
> >> > primitive dummy1 ocf:pacemaker:Dummy
> >> > primitive dummy2 ocf:pacemaker:Dummy
> >> > primitive dummy3 ocf:pacemaker:Dummy
> >> > colocation together inf: ( dummy1 dummy2 dummy3 )
> >> >
> >> > and I expect them to run on the same host, but they are not and I
> >> > attached hb_report to the case to prove it.
> >> >
> >> > Andrew closed it with the comment "Thats because you have
> >> > sequential="false" for the colocation set." But sequential="false" means
> >> > doesn't matter what order do they start.
> >>
> >> No.  Thats not what it means.
> >> And I believe I should know.
> >>
> >> It means that the members of the set are NOT collocated with each
> >> other, only with any preceding set.
> >
> > Just for clarification:
> >
> > colocation together inf: ( dummy1 dummy2 dummy3 ) dummy4
> >
> > .... is a shortcut for:
> >
> > colocation together1 inf: dummy4 dummy1
> > colocation together1 inf: dummy4 dummy2
> > colocation together1 inf: dummy4 dummy3
> >
> > ... is that correct?
> 
> Only if sequential != false.

You wanted to say "sequential == false"?

> For some reason the shell appears to be setting that by default.

This is sequential == false:

colocation together inf: ( dummy1 dummy2 dummy3 ) dummy4

This is sequential == true:

colocation together inf: dummy1 dummy2 dummy3 dummy4

Thanks,

Dejan

> 
> >
> > To pick up Vadym's Question:
> >
> > *  what would be the correct syntax to say "run-together-but-dont-care-if-one-
> > dies-or-is-not-runable"?
> 
> Choose a score < inf, just like regular colocation constraints.
> 
> >
> > Regards,
> > Andreas
> >
> >>
> >> > colocation still has to be honored.
> >> >
> >> > If I am wrong, what syntax I should use to achieve the described
> >> > configuration?
> >> >
> >> > Thank you,
> >> > Vadym Chepkov
> >> >
> >> >
> >> >
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> >> >
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> >> > Bugs:
> >> > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
> >>
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> >>
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> >>  http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
> >>
> >
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> >
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> >
> 
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