Unless you really need to consider moving to 6, it will be easier. That said, if you want to get to 7 I would:
* bring the new nodes in with tokens selected for 7. * move the old nodes to new 7-node tokens. * cleanup on the old nodes There is a way to expedite things by copying files around, _but_ if this is the first time you have grown the ring I would do it the normal documented way. I would make the changes one node at a time. There are a couple of reasons, but here are two: * if something goes wrong the impact will be less and the cleanup will be less. IMHO With a cluster of machines it's a good idea to make changes one at a time, so that if / when things go wrong you get the benefit of the other machines working. * bootstrapping new nodes will have some performance impact on the existing nodes. With fewer existing nodes it will have a larger impact. Hope that helps. ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 21/08/2012, at 12:57 AM, Filippo Diotalevi <fili...@ntoklo.com> wrote: > What's the best strategy to increase the cluster size from 3 nodes to 7 > nodes, while keeping the nodes balanced? > The datastax documentation at > http://www.datastax.com/docs/1.0/operations/cluster_management seems to > suggest that it's best practice to add one node at a time. Is it the only > approach? > > Can we add 4 new nodes, reset the tokens, and expect the cluster to rebalance > correctly? > > Thanks, > -- > Filippo Diotalevi > >
