You can certainly serve more reads with a 4th node, but I'm not sure
what you mean by "it won't have a voting role". It still participates
in voting for leaders as do all non-observers regardless of whether it
is an even or odd number. With zookeeper there is no voting on each
transaction, only leader changes.

-Dave Wright

On Wed, Aug 25, 2010 at 6:22 PM, Todd Nine <> wrote:
> Do I get any read performance increase (similar to an observer) since
> the node will not have a voting role?

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