We're considering a C* setup with very large columns and I have a question about the details of read.
I understand that a read request gets handled by the coordinator which sends read requests to <quorum> of the nodes holding replicas of the data, and once <quorum> nodes have replied with consistent data it is returned to the client. My understanding is that each of the nodes actually sends the full data being requested to the coordinator (which in the case of very large columns would involve lots of network traffic). Is that right? The alternative (which I don't think is the case but I've been asked to verify) is that the replicas first send meta-data to the coordinator which then asks one replica to send the actual data. Again, I don't think this is the case but was asked to confirm. Thanks. -- http://about.me/BrianTarbox
