Do not change the cluster name - the cassandra service will not start on the same sstables if the cluster name is changed.
Arvydas On Wed, Mar 8, 2017 at 4:57 PM, Chuck Reynolds <creyno...@ancestry.com> wrote: > I was hoping I could do the following > > · Change seeds > > · Change the topology back to simply > > · Stop nodes in datacenter 2 > > · Remove nodes in datacenter 2 > > · Restart nodes in datacenter 2 > > > > Somehow Cassandra holds on to the information about who was in the cluster. > > > > What if I also changed the cluster name in the Cassandra.yaml before > restarting? > > > > Is the data bound to the cluster name? > > > > *From: *Ryan Svihla <r...@foundev.pro> > *Reply-To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *Date: *Wednesday, March 8, 2017 at 7:38 AM > *To: *user <user@cassandra.apache.org> > *Subject: *Re: Disconnecting two data centers > > > > it's a bit tricky and I don't advise it, but the typical pattern is (say > you have DC1 and DC2): > > > > 1. partition the data centers from one another..kill the routing however > you can (firewall, etc) > > 2. while partitioned log onto DC1 alter schema so that DC2 is not > replicating), repeat for other. > > 2a. If using propertyfilesnitch remove the DC2 from all the DC1 property > files and vice versa > > 2b. change the seeds setting in the cassandra.yaml accordingly (DC1 yaml's > shouldn't have any seeds from DC2, etc) > > 3. rolling restart to account for this. > > 4,. run repair (not even sure how necessary this step is, but after doing > RF changes I do this to prevent hiccups) > > > > I've done this a couple of times but really failing all of that, the more > well supported and harder to mess up but more work approach is: > > > > 1. Set DC2 to RF 0 > > 2. remove all nodes from DC2 > > 3. change yamls for seed files (update property file if need be) > > 4. create new cluster in DC2, > > 5. use sstableloader to stream DC1 data to DC2. > > > > On Wed, Mar 8, 2017 at 8:13 AM, Chuck Reynolds <creyno...@ancestry.com> > wrote: > > I’m running C* 2.1.13 and I have two rings that are replicating data from > our data center to one in AWS. > > > > We would like to keep both of them for a while but we have a need to > disconnect them. How can this be done? > > > > > > -- > > Thanks, > > Ryan Svihla >
