Hi all -

Is there any way to force ZK to accept 1 of 2 as being quorum?

Thanks,

-- Eric

No - ZK needs a majority of nodes to be a quorum. In a 2-node cluster, the
only majority is of size 2.

Henry

On 11 September 2012 19:23, Eric Pederson <[EMAIL PROTECTED]> wrote:

> Hi all -
>
> Is there any way to force ZK to accept 1 of 2 as being quorum?
>
> Thanks,
>
> -- Eric
>

--
Henry Robinson
Software Engineer
Cloudera
415-994-6679

Well... you can set one of the 2 as an observer.  That way you can have a
quorum of one of 2, but you can't have a quorum of the other of two.
 Probably not what you want.

You can also set up a third member who refuses to become leader.  They
basically serve as a tiebreaker.  You can lighten the load on the
tiebreaker by not allowing clients to connect.

On Tue, Sep 11, 2012 at 7:25 PM, Henry Robinson <[EMAIL PROTECTED]> wrote:

> No - ZK needs a majority of nodes to be a quorum. In a 2-node cluster, the
> only majority is of size 2.
>
> Henry
>
> On 11 September 2012 19:23, Eric Pederson <[EMAIL PROTECTED]> wrote:
>
> > Hi all -
> >
> > Is there any way to force ZK to accept 1 of 2 as being quorum?
> >
> > Thanks,
> >
> > -- Eric
> >
>
>
>
> --
> Henry Robinson
> Software Engineer
> Cloudera
> 415-994-6679
>

Interestingly, we had a server kernel crash a few days ago which meant that
we only had two nodes up out of three. Which makes me wonder if three is
really a suboptimal cluster size. Perhaps 5 is a better odd number.
 On Sep 12, 2012 12:24 PM, "Eric Pederson" <[EMAIL PROTECTED]> wrote:

> Hi all -
>
> Is there any way to force ZK to accept 1 of 2 as being quorum?
>
> Thanks,
>
> -- Eric
>