Right, and I also meant to refer to the anti-pattern doc related to racks: http://docs.datastax.com/en/cassandra/2.0/cassandra/architecture/architecturePlanningAntiPatterns_c.html
Although that doc seems to discourage rack selection entirely when in fact people should try to have replicas placed in separate racks since a lot of failures tend to be due to power, cooling, and network switching at the rack level (or so I have heard but have no personal experience.) -- Jack Krupansky On Thu, Nov 26, 2015 at 7:41 PM, Paulo Motta <pauloricard...@gmail.com> wrote: > Changing the rack of a live node is discouraged, since the ring ranges the > node is responsible for will change, meaning the node will not own part of > the data for its new ranges and other nodes may not have some of its > current data. > > It will be a forbidden operation in the upcoming versions of Cassandra, > since it has caused trouble before, see > https://issues.apache.org/jira/browse/CASSANDRA-10242 for more > background. The safest thing is to decommission the node and bootstrap the > node again in a new rack, as Jack suggested. > > 2015-11-26 14:40 GMT-08:00 Jack Krupansky <jack.krupan...@gmail.com>: > >> What RF are you using? How many data centers? What rack configuration are >> you currently using/ Are you in fact using a rack-aware network topology >> partitioner? >> >> Specifically, what are you attempting to accomplish - why change the rack >> at all? Not that changing the rack is necessarily bad, just to clarify your >> objective. >> >> See: >> >> http://docs.datastax.com/en/cassandra/2.0/cassandra/architecture/architectureDataDistributeReplication_c.html >> >> You may just have to bootstrap the new node with the proper rack and then >> run repair on the nodes which formerly held replicas of the old node. >> >> Or, you may have to run a full repair for all nodes of the cluster: >> >> http://docs.datastax.com/en/cassandra/2.0/cassandra/operations/opsMoveNodeRack.html >> >> >> -- Jack Krupansky >> >> On Thu, Nov 26, 2015 at 4:02 AM, Badrjan <badr...@tuta.io> wrote: >> >>> So I have a 8 node cluster and I would like to change the rack of one >>> node. How should I do that? >>> >>> B. >>> >> >> >
