[ovirt-devel] Where's MOM (on latest master)

Fri Nov 18 11:19:56 UTC 2016

> On 18 Nov 2016, at 12:12, Oved Ourfali <oourfali at redhat.com> wrote:
> 
> I don't think it is related to version X or Y. It is a race, so might be related to other factors.
> 

likely because json-rpc is initialized after xml-rpc….or indeed whatever else;-)

either way it needs to be solved. Either by improving the systemd service file or mom retry (btw you likely still want to have a retry in mom once it starts responding due to delayed vdsm async recovery taking potentially minutes)

> 
> On Nov 18, 2016 12:59 PM, "Martin Sivak" <msivak at redhat.com <mailto:msivak at redhat.com>> wrote:
> > Are we / can we use systemd socket activation there?
> 
> That actually requires systemd specific code iirc (to take over the
> standing by socket). I am actually wondering why the xml-rpc in 4.0.4
> was fine and json-rpc in 4.0.6 is too slow.
> 
> Martin
> 
> On Fri, Nov 18, 2016 at 11:53 AM, Anton Marchukov <amarchuk at redhat.com <mailto:amarchuk at redhat.com>> wrote:
> > Hello All.
> >
> > Are we / can we use systemd socket activation there?
> >
> > Anton.
> >
> > On Fri, Nov 18, 2016 at 11:21 AM, Martin Sivak <msivak at redhat.com <mailto:msivak at redhat.com>> wrote:
> >>
> >> What about making vdsm ready to answer connections when it returns to
> >> systemd instead? I hate workarounds and this always worked fine.
> >>
> >> Martin
> >>
> >> On Fri, Nov 18, 2016 at 11:13 AM, Oved Ourfali <oourfali at redhat.com <mailto:oourfali at redhat.com>>
> >> wrote:
> >> > Seems like a race regardless of the protocol.
> >> > Should you add a retry?
> >> >
> >> >
> >> > On Nov 18, 2016 11:52 AM, "Martin Sivak" <msivak at redhat.com <mailto:msivak at redhat.com>> wrote:
> >> >>
> >> >> Yes, because VDSM is supposed to be up (there is systemd dependency).
> >> >> This always worked fine with xml-rpc.
> >> >>
> >> >> Martin
> >> >>
> >> >> On Fri, Nov 18, 2016 at 10:14 AM, Nir Soffer <nsoffer at redhat.com <mailto:nsoffer at redhat.com>>
> >> >> wrote:
> >> >> > On Fri, Nov 18, 2016 at 10:45 AM, Martin Sivak <msivak at redhat.com <mailto:msivak at redhat.com>>
> >> >> > wrote:
> >> >> >> This happens because MOM can't connect to VDSM and so it quits.
> >> >> >
> >> >> > So mom try once to connect and if the connection fails it quits?
> >> >> >
> >> >> >> We
> >> >> >> discussed it on the mailinglist
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> https://lists.fedoraproject.org/archives/list/vdsm-devel@lists.fedorahosted.org/thread/MZ7UJUWO5KFRDJJDNXX7VIYU5PWSXF62/ <https://lists.fedoraproject.org/archives/list/vdsm-devel@lists.fedorahosted.org/thread/MZ7UJUWO5KFRDJJDNXX7VIYU5PWSXF62/>
> >> >> >> http://lists.ovirt.org/pipermail/devel/2016-November/014101.html <http://lists.ovirt.org/pipermail/devel/2016-November/014101.html>
> >> >> >>
> >> >> >> This issue never happened with XML-RPC.
> >> >> >>
> >> >> >> Shira reported it as
> >> >> >> https://bugzilla.redhat.com/show_bug.cgi?id=1393012 <https://bugzilla.redhat.com/show_bug.cgi?id=1393012>
> >> >> >>
> >> >> >> Martin
> >> >> >>
> >> >> >> On Thu, Nov 17, 2016 at 7:42 PM, Yaniv Kaul <ykaul at redhat.com <mailto:ykaul at redhat.com>>
> >> >> >> wrote:
> >> >> >>> I've recently seen, including now on Master, the following
> >> >> >>> warnings:
> >> >> >>> Nov 17 13:33:25 lago-basic-suite-master-host0 systemd[1]: Started
> >> >> >>> MOM
> >> >> >>> instance configured for VDSM purposes.
> >> >> >>> Nov 17 13:33:25 lago-basic-suite-master-host0 systemd[1]: Starting
> >> >> >>> MOM
> >> >> >>> instance configured for VDSM purposes...
> >> >> >>> Nov 17 13:33:35 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, Policy could not be set.
> >> >> >>> Nov 17 13:33:39 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:33:39 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:33:55 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:33:55 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:34:10 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:34:10 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:34:26 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:34:26 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:34:42 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:34:42 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:34:57 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>> Nov 17 13:34:57 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available, KSM stats will be missing.
> >> >> >>> Nov 17 13:35:12 lago-basic-suite-master-host0 vdsm[2012]: vdsm MOM
> >> >> >>> WARN MOM
> >> >> >>> not available.
> >> >> >>>
> >> >> >>>
> >> >> >>>
> >> >> >>> Any ideas what this is and why?
> >> >> >>>
> >> >> >>> _______________________________________________
> >> >> >>> Devel mailing list
> >> >> >>> Devel at ovirt.org <mailto:Devel at ovirt.org>
> >> >> >>> http://lists.ovirt.org/mailman/listinfo/devel <http://lists.ovirt.org/mailman/listinfo/devel>
> >> >> >> _______________________________________________
> >> >> >> Devel mailing list
> >> >> >> Devel at ovirt.org <mailto:Devel at ovirt.org>
> >> >> >> http://lists.ovirt.org/mailman/listinfo/devel <http://lists.ovirt.org/mailman/listinfo/devel>
> >> >> _______________________________________________
> >> >> Devel mailing list
> >> >> Devel at ovirt.org <mailto:Devel at ovirt.org>
> >> >> http://lists.ovirt.org/mailman/listinfo/devel <http://lists.ovirt.org/mailman/listinfo/devel>
> >> >>
> >> >>
> >> >
> >> _______________________________________________
> >> Devel mailing list
> >> Devel at ovirt.org <mailto:Devel at ovirt.org>
> >> http://lists.ovirt.org/mailman/listinfo/devel <http://lists.ovirt.org/mailman/listinfo/devel>
> >
> >
> >
> >
> > --
> > Anton Marchukov
> > Senior Software Engineer - RHEV CI - Red Hat
> >
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