+1
Which default? 100? A prime?
We should also make sure the CH function is optimized for this being on.
I think if we are confident it will benefit all, we should turn it on.
On 26 Jan 2012, at 18:54, Mircea Markus wrote:
> Hi,
>
> ATM the default value for virtualNodes is 1. This means that the wheel-share each node has can be very uneven[1] for smalls(up to 15 nodes) clusters.
> Increasing this value even to a small number(10-30) would significantly improve each node's share of wheel and the chance for a well balanced data distribution over the cluster.
> So I think that increasing the default value would make sense. What are the drawbacks though? I'm thinking performance and HR wise...
>
>
> [1] a random example of uneven distribution obtained with radargun
>
> Cluster size: 4 -> ( 15505 13698 5918 4482)
> Cluster size: 6 -> ( 8761 7820 17145 8188 12827 4183)
> Cluster size: 8 -> ( 8391 6302 10773 22068 3589 200 3050 25211)
>
>
>
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