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From Milind Parikh <milindpar...@gmail.com>
Subject Re: Why so many vnodes?
Date Mon, 10 Jun 2013 14:54:33 GMT
There are n vnodes regardless of the size of the physical cluster.
Regards
Milind
On Jun 10, 2013 7:48 AM, "Theo Hultberg" <theo@iconara.net> wrote:

> Hi,
>
> The default number of vnodes is 256, is there any significance in this
> number? Since Cassandra's vnodes don't work like for example Riak's, where
> there is a fixed number of vnodes distributed evenly over the nodes, why so
> many? Even with a moderately sized cluster you get thousands of slices.
> Does this matter? If your cluster grows to over thirty machines and you
> start looking at ten thousand slices, would that be a problem? I guess trat
> traversing a list of a thousand or ten thousand slices to find where a
> token lives isn't a huge problem, but are there any other up or downsides
> to having a small or large number of vnodes per node?
>
> I understand the benefits for splitting up the ring into pieces, for
> example to be able to stream data from more nodes when bootstrapping a new
> one, but that works even if each node only has say 32 vnodes (unless your
> cluster is truly huge).
>
> yours,
> Theo
>

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