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From Hiren Shah <>
Subject RE: Cassandra reconfiguration
Date Thu, 22 Sep 2011 13:17:30 GMT
Our RF is 2 and we are planning to keep that. Thanks for addressing the decommissioning puzzle.
That is where I could not find any doc.


From: aaron morton []
Sent: Wednesday, September 21, 2011 6:01 PM
Subject: Re: Cassandra reconfiguration

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.


Aaron Morton
Freelance Cassandra Developer

On 22/09/2011, at 5:29 AM, Hiren Shah wrote:


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

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