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From Peter Schuller <peter.schul...@infidyne.com>
Subject Re: recommended way to grow a cluster?
Date Tue, 08 Mar 2011 15:41:19 GMT
> - When adding nodes to a cluster it's mode efficient if you can change the
> range to existing nodes to be a sub set of what they were responsible for
> previously. So the node only has to stream out data, rather than stream out
> and stream in data. Say you have this contrived example (where values are

Also, doubling is usually the easiest thing to do because it only
involves inserting new nodes at appropriate places. Any increase that
involves moving nodes is a bit more of an issue because moving a node
implies decommission+bootstrap. If your cluster is not under
significant load it is not a huge problem, but if you're trying to
execute a cluster expansion live with significant amounts of live
traffic, you may not want to remove any of your existing nodes even
temporarily.

So, if possible, I'd recommend doubling. You can get around the
problem of move being a decommission+bootstrap by jumping through some
extra hoops (essentially using an 'extra' node so you can do
insertions followed by removals instead of moves), but it's more of a
hassle.

-- 
/ Peter Schuller

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