On Sat, Jan 16, 2010 at 10:44 AM, Poul-Henning Kamp <[email protected]>wrote:
> In message <[email protected]>, > Micha > el Fischer writes: > > >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. > > If you have perfect 1/3 splitting between 3 varnishes, having one die > will do bad things to your hitrate until the remaining two distribute > the load between them. > > That's a matter of math, and has nothing to do with the hash algorithm. Let me put it this way and leave the math up to you: it will be way worse if you don't use a consistent hash. --Michael
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