[erlang-questions] Large scale deployments testing

Zhemzhitsky Sergey <>
Mon Sep 24 08:15:24 CEST 2012


Hi guys,

Thanks for the information and links!

Best Regards,
Sergey Zhemzhitsky
Phone. +7 495 2580500 ext. 1246

From: Michael Truog [mailto:]
Sent: Saturday, September 22, 2012 5:58 AM
To: Joel Meyer; Zhemzhitsky Sergey
Cc: ; erlang-questions
Subject: Re: [erlang-questions] Large scale deployments testing

On 09/21/2012 03:00 PM, Joel Meyer wrote:
Hi Sergey,

We (OpenX) have a riak_core based application that's running on a 125 node cluster (there are also other smaller clusters). We never really tested to see where it would fall over (and the cluster was much smaller when it started), but I see no indicators that it will fall over when we add the 126th node. FWIW, it's running riak_core 0.13.0, and I assume the newer versions of riak_core have only gotten better. Answers to some of your other questions (based solely on my experience) in-line below.

The riak list mentioned optimism about riak clusters of 200+ nodes in a thread here:
http://riak-users.197444.n3.nabble.com/does-Riak-cluster-maintain-fully-connected-Erlang-network-td3695942.html

However, as mentioned in the thread, a fully connected network of nodes (fully connected because of the usage of distributed Erlang) does  have a natural limit (due to the network speed) on scalability with the net tick time.  You can always increase the net tick time, but then failures will take longer to detect.

So, your success may rely on your fault-tolerance requirements.

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