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The "Operations" page has been changed by JonathanEllis. http://wiki.apache.org/cassandra/Operations?action=diff&rev1=9&rev2=10 -------------------------------------------------- Note that with !RackAwareStrategy, succeeding nodes along the ring should alternate data centers to avoid hot spots. For instance, if you have nodes A, B, C, and D in increasing Token order, and instead of alternating you place A and B in DC1, and C and D in DC2, then nodes C and A will have disproportionately more data on them because they will be the replica destination for every Token range in the other data center. * The corollary to this is, if you want to start with a single DC and add another later, when you add the second DC you should add as many nodes as you have in the first rather than adding a node or two at a time gradually. - Replication strategy may not be changed without wiping your data and starting over. + Replication strategy is not intended to be changed once live, but if you are sufficiently motivated it can be done with some manual effort: + 1. anticompact each node's primary Range, yielding sstables containing only that Range data + 1. copy those sstables to the nodes responsible for extra replicas under the new strategy + 1. change the strategy and restart == Network topology ==
