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From Michi Mutsuzaki <mi...@cs.stanford.edu>
Subject Re: using observers for failover
Date Thu, 12 Sep 2013 17:54:55 GMT
Hi Brian,

Currently you cannot convert an observer to a participant without
modifying zoo.cfg and restarting all the servers. With dynamic
reconfiguration (new in 3.5), you can convert  an observer to a
participant without needing to restart the entire cluster.

I think by far the most common way to tolerate 2 node failure is to
deploy a cluster with 5 or more nodes.

On Thu, Sep 12, 2013 at 5:16 AM, Brian Tarbox <briantarbox@gmail.com> wrote:
> We have a 3 node cluster which as I understand it means we can survive the
> failure of a single node.  We have a 4th machine available and I'm
> wondering if I can run zk as an observer on that node and have it take over
> in the case of the failure of one of the regular nodes?
> If that doesn't make sense can anyone answer the more general question of
> how to deal with multiple node failure?
> Thanks,
> Brian Tarbox
> --
> http://about.me/BrianTarbox

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