Strategies for splitting load across varnish instances? Andavoiding single-point-of-failure?

[BUSTARRET, Jean-francois]

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> It's probably simplest to paraphrase the code:
> 
> 	Calculate hash over full complement of backends.
>	Is the selected backend sick
>		Calculate hash over subset of healthy backends

Let's get back to consistent hashing and it's use...

Correct me if I am wrong, but doesn't this mean that adding a new varnish instance implies a full rehash ? 

This can be a problem for scalability. Memcached clients typically solve this by using consistent hashing (a key stays on the same node, even in case of a node failure or node addition/removal).

Jean-François