All nodes in the cluster need two way communication. Nodes need to talk to Gossip to each other so they know they are alive.
If you need to dump a lot of data consider the Hadoop integration. http://wiki.apache.org/cassandra/HadoopSupport It can run a bit faster than going through the thrift api. Copying sstables may be another option depending on the data size. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 25/02/2012, at 3:21 AM, Alexandru Sicoe wrote: > Hello everyone, > > I'm battling with this contraint that I have: I need to regularly ship out > timeseries data from a Cassandra cluster that sits within an enclosed > network, outside of the network. > > I tried to select all the data within a certian time window, writing to a > file, and then copying the file out but this hits the I/O performance because > even for a small time window (say 5mins) I am hitting more than a million > rows. > > It would really help if I used Cassandra to replicate the data automatically > outside. The problem is they will only allow me to have outbound traffic out > of the enclosed network (not inbound). Is there any way to configure the > cluster or have 2 data centers in such a way that the data center (node or > cluster) outside of the enclosed network only gets a replica of the data, > without ever needing to communicate anything back? > > I appreciate the help, > Alex
