Large ring_creation_size

Greg Nelson grourk at
Wed Apr 13 15:41:09 EDT 2011

The largest known riak cluster != the largest possible riak cluster. ;-)

The inter node communication of the cluster depends on the data set and usage pattern, doesn't it? Or is there some constant overhead that tops out at a few hundred nodes? I should point out that we'll have big data, but not a huge number of keys.

The number of vnodes in the cluster should be equal to the ring_creation_size under normal circumstances, shouldn't it? So when I have a one node cluster, that node is running ring_creation_size vnodes... File descriptors probably isn't a problem -- these machines won't be doing anything else, and the limits are set to 65536.

Thinking about the internode communication you mentioned, that's probably where the resource hog is.. socket buffers, etc.

Anyway, I'd also love to hear more from basho. :)
On Wednesday, April 13, 2011 at 12:33 PM, siculars at wrote: 
> Ill just chime in and say that this is not practical for a few reasons. The largest known riak cluster has like 50 or 60 nodes. Afaik, inter node communication of erlang clusters top out at a few hundred nodes. I'm also under the impression that each physical node has to have enough file descriptors to accommodate every virtual node in the cluster. 
> I'd love to hear more from basho. 
> -alexander 
> Sent from my Verizon Wireless BlackBerry
> -----Original Message-----
> From: Greg Nelson <grourk at>
> Sender: riak-users-bounces at
> Date: Wed, 13 Apr 2011 12:13:34 
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> Subject: Large ring_creation_size
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