Hi Luis,
I don't thinks it's possible to achieve this by custom Snitch. As far as I understand Snitch only provides cluster topology, and connectivity is done by another component/layer. And each cluster node should be able to connect to every other node. So I would keep with Michael's options a) - "establish network communication forthe entire cluster" Best regards, Vladimir Yudovin, Winguzone - Cloud Cassandra Hosting ---- On Fri, 21 Apr 2017 15:42:17 -0400 Luis Miguel <arb...@hotmail.com> wrote ---- Hi Michael! Thanks for your answer I feared that was the answer...do you know if implementing my own Snitch would be possible to handle this situation? ________________________________ De: Michael Shuler <mshu...@pbandjelly.org> en nombre de Michael Shuler <mich...@pbandjelly.org> Enviado: viernes, 21 de abril de 2017 19:16:43 Para: user@cassandra.apache.org Asunto: Re: Cassandra Cluster Doubts You have one cluster that is comprised of N nodes that may be distributed in racks and data centers. All the nodes of your cluster need to be able to communicate - they are one cluster. I think your options would be to a) establish network communication for the entire cluster, or b) set up a new cluster for DCR2 and sync data snapshots of Keyspace2 in some manner, or c) figure out a second cluster that contains the data centers that do have network connectivity and adjust application to query the appropriate cluster. There may be some other creative ideas that pop up. -- Kind regards, Michael On 04/21/2017 07:26 AM, Luis Miguel wrote: > Hello! > > > I have three DC: > > DC1 -> 3 nodes, Keyspace1:3 > DC2 -> 3 nodes, Keyspace2:3 > DCR1 -> 3 nodes, Keyspace1:2, Keyspace2:2 > > now I am trying to add a new datacenter to the cluster: > > DCR2-> 1 node (by now), Keyspace2:1 which network configuration can > access to DC2 and DCR1 but it will never has access to DC1. > > when I try to start the node in DCR2, it does everything right with > Keyspace2...but Gossips DCR1 and DC1... and crashes with > RuntimeException because it can't move data consistently from DC1 nodes > (obviously I don't have network connection to those nodes from this > datacenter)... > when I try to use -Dcassandra.consistent.rangemovement= false > option ...It also crashes with IllegalStateException: unable to find > sufficient sources for streaming range......etc..etc.. > > It is possible to have that kind of topology in cassandra? I mean.. Can > I have a cluster where some datacenters will never "connect" other > datacenters? > > Thanks in advance!!!
