On Sat, Jan 16, 2010 at 9:22 AM, Poul-Henning Kamp <[email protected]>wrote:
> In message <[email protected]>, > Micha > el Fischer writes: > > >On Sat, Jan 16, 2010 at 1:59 AM, Poul-Henning Kamp <[email protected] > >wrote: > > > >> director h1 hash { > >> { .backend webserver; .weight 1; } > >> { .backend varnish2; .weight 1; } > >> { .backend varnish3; .weight 1; } > > > > > >What happens when varnish2 or varnish3 dies? > > If a particular backend in the director is unhealthy, the requests > for it will be redistributed by rehashing over the healthy subset > of directors. Once it becomes healthy, normality will be restored. > > So everything should work out fine, for some value around 99.9% of fine. For instance sizes larger than 2, I think a consistent hash is needed. Otherwise, the overall hit ratio will fall dramatically upon failure of an instance as the requests are rerouted. --Michael
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