Ruslan,
Thanks for your response.
-kvh

On Mon, Aug 6, 2012 at 2:08 PM, Ruslan Ermilov [via nginx] <
ml-node+s2469901n7581131h55@n2.nabble.com> wrote:

> On Sun, Aug 05, 2012 at 10:10:39PM -0700, kvhdude wrote:
> > Folks,
> > Can anyone help me out?
> > To clarify: I am just looking for confirmation as i add an upstream
> > server, will hash change for existing users (these are using XMPP
> sessions
> > so they will suffer disruption of service).
>
> Yes, it will. The hashing implemented by ip_hash is not consistent.
>
> There's limited support for preserving hash values when a server in
> an upstream goes down, in the form of the "down" parameter, please
> see http://nginx.org/r/ip_hash for details.
>
> Adding consistent hashing is planned in future versions of nginx.
>
> > kvhdude wrote
> > >
> > > Hi,
> > >
> > > I need a clarification regarding ip_hash directive :
> > > Would adding a new upstream server affect existing users that are
> bound to
> > > some other servers?
> > > I am trying to dynamically scale up the servers (using scalr) in EC2
> > > setting.
> > >
> > > I am guessing it won't, but i needed to be sure.
>
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