[ovirt-devel] oVirt 4.2.0 GA status

[Martin Perina]

On Tue, Dec 19, 2017 at 2:05 PM, Martin Sivak <msivak at redhat.com> wrote:

> >> So I think that we still have to fix it somehow.
> >> Are we really sure that nr_retries=2 and _timeout=20 are really the
> magic numbers that works on every conditions?
> >
> >
> > No, it should be tested on HE environment and it depends on your usage.
>
> What does happen when only timeout is specified and the connection
> fails after the command is sent? What are the defaults in that case?
>

​So, there are not magic numbers to fit all, here's the description​

​of those parameters:

nr_retries
  - number of reconnection retries
  - if not specified than defualt is 1

_timeout​
  - it's maximum time to wait for reply of a command/veb if client is
connected
  - this does not affect reconnection any way, meaning the client could
reconnect for example for 10 minutes (using high enough nr_retries value)
and yet this timeout may not be reached

So here are 2 suggestions:

1. Set nr_retries=0 and client will behave the same way as in 4.1 (meaning
no reconnection performed)

2. Set nr_retries to high enough number (for example 100 000) and hope that
this number of retries is enough for host being deployed using host deploy.
I know that setting this number is tricky for HE, because the host deploy
can take really different amount of time, but there's no exact way how to
define exact timeout of single reconnection as it depends to the failure
during attempt to connect.

AFAIK no other functionality was mentioned in [1], so nothing else is
implemented. If there are other requirement for reconnection functionality,
then let's open a new RFE for that and discuss it

Thanks

Martin

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1376843


> Martin
>
> On Tue, Dec 19, 2017 at 1:55 PM, Irit Goihman <igoihman at redhat.com> wrote:
> >
> >
> >
> > On Tue, Dec 19, 2017 at 2:51 PM, Simone Tiraboschi <stirabos at redhat.com>
> wrote:
> >>
> >>
> >>
> >> On Tue, Dec 19, 2017 at 12:56 PM, Martin Perina <mperina at redhat.com>
> wrote:
> >>>
> >>> As Irit mentioned the provided reproduction steps are wrong (misuse of
> the code) and she posted correct example showing that jsonrpc code works as
> expected. So Martin/Simone are you using somewhere in HE code the original
> example that is misusing the client?
> >>
> >>
> >> According to
> >> https://bugzilla.redhat.com/show_bug.cgi?id=1527155#c9
> >> It works in Irit example, at least on that host with that load and
> timings, setting nr_retries=2 and _timeout=20
> >>
> >> While we have _timeout=5 and no custom nr_retries
> >> https://github.com/oVirt/ovirt-hosted-engine-ha/blob/
> master/ovirt_hosted_engine_ha/lib/util.py#L417
> >>
> >> So I think that we still have to fix it somehow.
> >> Are we really sure that nr_retries=2 and _timeout=20 are really the
> magic numbers that works on every conditions?
> >
> >
> > No, it should be tested on HE environment and it depends on your usage.
> >>
> >>
> >>>
> >>>
> >>> Thanks
> >>>
> >>> Martin
> >>>
> >>>
> >>> On Tue, Dec 19, 2017 at 12:53 PM, Oved Ourfali <oourfali at redhat.com>
> wrote:
> >>>>
> >>>> From the latest comment it doesn't seem like a blocker to me.
> >>>> Martin S. - your thoughts?
> >>>>
> >>>> On Tue, Dec 19, 2017 at 1:48 PM, Sandro Bonazzola <
> sbonazzo at redhat.com> wrote:
> >>>>>
> >>>>> We have a proposed blocker for the release:
> >>>>> 1527155InfravdsmBindings-APIigoihman at redhat.comNEWjsonrpc reconnect
> logic does not work and gets stuckurgentunspecifiedovirt-4.2.004:30:30
> >>>>>
> >>>>> Please review and either approve the blcoker or postpone to 4.2.1.
> >>>>> Thanks,
> >>>>>
> >>>>>
> >>>>> --
> >>>>>
> >>>>> SANDRO BONAZZOLA
> >>>>>
> >>>>> ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D
> >>>>>
> >>>>> Red Hat EMEA
> >>>>>
> >>>>> TRIED. TESTED. TRUSTED.
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Devel mailing list
> >>>>> Devel at ovirt.org
> >>>>> http://lists.ovirt.org/mailman/listinfo/devel
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Martin Perina
> >>> Associate Manager, Software Engineering
> >>> Red Hat Czech s.r.o.
> >>
> >>
> >
> >
> >
> > --
> >
> > IRIT GOIHMAN
> >
> > SOFTWARE ENGINEER
> >
> > EMEA VIRTUALIZATION R&D
> >
> > Red Hat EMEA
> >
> > TRIED. TESTED. TRUSTED.
> > @redhatnews   Red Hat   Red Hat
>



-- 
Martin Perina
Associate Manager, Software Engineering
Red Hat Czech s.r.o.
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