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From Vijay <vijay2...@gmail.com>
Subject Re: Question regarding Membership Election
Date Thu, 14 Jan 2010 20:59:04 GMT
Thanks Henry,

Regards,
</VJ>




On Thu, Jan 14, 2010 at 12:40 PM, Henry Robinson <henry@cloudera.com> wrote:

> Hi -
>
> If you put all your voting nodes in one datacenter, that datacenter becomes
> a 'single point of failure' for the cluster. If it gets cut off from any
> other datacenters, the cluster will not be available to those datacenters.
>
> If you want to withstand the failure of datacenters, then you need voting
> members inside every datacenter. Observers can't suddenly become voting
> members.
>
> You can't even put 'dormant' voting members (that never bother to vote) in
> your other datacenters because you would need a quorum of them to continue
> after the original datacenter failed. And if this was true, the original
> datacenter would not, by construction, contain a quorum of voting nodes. So
> you'd still have to vote outside the cluster.
>
> Henry
>
> 2010/1/14 Vijay <vijay2win@gmail.com>
>
> > Hi,
> >
> > I read about observers in other datacenter,
> >
> > My question is i dont want voting across the datacenters (So i will use
> > observers), at the same time when a DC goes down i dont want to loose the
> > cluster, whats the solution for it?
> >
> > I have to have 3 nodes in primary DC to accept 1 node failure. Thats
> > fine...
> > but what about the other DC? how many nodes and how will i make it work?
> >
> > Regards,
> > </VJ>
> >
>

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