http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660Membase does live cluster reconfiguration, but they are merely persistent memcached, no queries / indexes yet, but they will get there one day... http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment4http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment4Wed, 15 Dec 2010 00:39:45 GMT@Jonathan, speaking about Cassandra, you should scale up it part by part, remembering, that there is a growth factor you should not exceed in one scaling iteration, but finally it is linearly scalable :) http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment3http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment3Sun, 12 Dec 2010 20:33:29 GMTThe ability to linearly scale your data storage up or down is one the core tenants of Amazon's Dynamo paper along with the various implementations such as Cassandra and Riak. So, while it is being done, it does have the potential to introduce some interesting temporal and consistency problems into your application code which then has to reconcile divergent copies of the underlying data. This probably why Facebook opted to go with a fully consistent HBase for their new messaging platform rather than continue with Cassandra or another Dynamo clone. http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment2http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment2Sat, 11 Dec 2010 16:13:21 GMTSeems that salesforce disagrees. [http://www.database.com/](http://www.database.com/)http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment1http://ayende.com/4719/data-roles-don-t-scale-up-down-dynamically#comment1Sat, 11 Dec 2010 16:06:08 GMT