Thanks everybody for the suggestions. We are using vnodes, 1 datacenter. So far it was all in 1 rack. The reason for this is that we are breaking each 46 processor physical machine to 4 docker containers with cassandra in them. Each C* will have a separate ssd disk. Via doing this we want to achieve faster repairs. Each physical machine will be a separate rack so that data will be replicated to different physical machines (RF=3).B.
27. Nov 2015 04:50 by jack.krupan...@gmail.com: > 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.>>>> >>> >>> >> >> > >
