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From Tim Bain <tb...@alumni.duke.edu>
Subject Re: clustering architecture
Date Wed, 04 May 2016 12:57:07 GMT
Please start a new email thread, with a new subject, for any questions you
want answered.  Hijacking someone else's thread where they're trying to get
answers to their own questions is impolite.

Tim
On May 4, 2016 6:34 AM, "Jstaceyss" <Jenniferstaceysouthard@gmail.com>
wrote:

> Tim,
>
> I'm not sure if you can help but this site with jms codes is ruining my
> life. The responsibility of the actions of others is not being taken.
> Please stop it. I am beginning to beg for help
> On May 2, 2016 11:46 PM, "Tim Bain [via ActiveMQ]" <
> ml-node+s2283324n4711461h93@n4.nabble.com> wrote:
>
> > It's not possible to have a quorum (i.e. > 50%) in all scenarios when you
> > only have two groupings and both of them could disappear entirely.  By
> > definition, to have a quorum after the loss of one grouping, the lost
> > grouping must be < 50% and the one that remains must be > 50%, so in the
> > inverse situation you can't possibly have a quorum.  This is why three is
> > typically the number used to ensure survivability of the loss of a single
> > item (whether an "item" is a process, a host, a rack, or a datacenter).
> > So
> > either you need a third datacenter in a third location, or you need to
> put
> > two groupings in a single geographic site (in separate buildings, for
> > example, or different floors or rooms, or on the other side of town), and
> > accept that you're sacrificing the ability to survive certain
> catastrophes
> > in order to save the cost of locating the third datacenter somewhere
> > geographically distant.
> >
> > Tim
> >
> > On Sun, May 1, 2016 at 8:37 AM, sekaijin <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4711461&i=0>>
> > wrote:
> >
> > > Hi
> > >
> > > There is a little thing I do not understand in the election of the
> > master.
> > >
> > > I have two geographic site (Paris, Versailles).
> > > the quorum is (n / 2) +1
> > > if I have two servers in each site
> > > the quorum is (4/2) +1 = 3
> > > so if I have a blackout on the site (eg fire) I do not have the quorum
> > > because I have only two servers
> > >
> > > if I have two server on a site and on the other
> > > the quorum is (3/2) +1 = 2
> > > so if I have a blackout on first site (eg fire) I do not have a quorum
> > > because I have only one server
> > >
> > > It is impossible to secure the cluster?
> > >
> > > A+JYT
> > >
> > >
> > >
> > > --
> > > View this message in context:
> > >
> >
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> > > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
> > >
> >
> >
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