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

[Nir Soffer]

On Fri, Nov 18, 2016 at 12:21 PM, Martin Sivak <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.

This is clearly a mom bug. Mom must have retry mechanism when and do not
expect that vdsm is ready to accept connections when mom starts.

Vdsm can be nicer and notify systemd when vdsm is ready. I already mentioned it
in the other thread here:
http://lists.ovirt.org/pipermail/devel/2016-November/014104.html

But even if vdsm did this, mom still needs a retry mechanism.

Nir

>
> Martin
>
> On Fri, Nov 18, 2016 at 11:13 AM, Oved Ourfali <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> 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> wrote:
>>> > On Fri, Nov 18, 2016 at 10:45 AM, Martin Sivak <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/
>>> >> 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
>>> >>
>>> >> Martin
>>> >>
>>> >> On Thu, Nov 17, 2016 at 7:42 PM, Yaniv Kaul <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
>>> >>> http://lists.ovirt.org/mailman/listinfo/devel
>>> >> _______________________________________________
>>> >> Devel mailing list
>>> >> Devel at ovirt.org
>>> >> http://lists.ovirt.org/mailman/listinfo/devel
>>> _______________________________________________
>>> Devel mailing list
>>> Devel at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/devel
>>>
>>>
>>