What are the token assignments and what is the RF ? Without knowing the details I would guess…
Make the RF changes you want for DC 1 and 2 and repair. decomission the nodes in DC3 one at a time. Cheers ----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 22/09/2011, at 5:29 AM, Hiren Shah wrote: > Hi, > > We have cassandra in production in three data centers with five nodes each. > We are getting rid of one of the data centers, so I want to reconfig my > cluster to two data centers, seven nodes each. I first need to shut down DC3. > I have already shut down traffic to DC3 and am running repairs. My priority > #1 is to maintain the stability of overall cluster (the two live data > centers). Some data loss is tolerable, but it will be ideal if I can avoid > that. > > What is the best way to decommission entire data center? Should I issue > decommission to the nodes one by one? Will that put additional load on > remaining nodes in DC3? Or should I just shut them down and then run > removetoken for these nodes? Or is there a better way? > > Thanks in advance, > Hiren Shah >
