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From Omar Shibli <>
Subject Re: Decommission an entire DC
Date Tue, 23 Jul 2013 22:04:23 GMT
All you need to do is to decrease the replication factor of DC1 to 0, and
then decommission the nodes one by one,
I've tried this before and it worked with no issues.


On Tue, Jul 23, 2013 at 10:32 PM, Lanny Ripple <> wrote:

> Hi,
> We have a multi-dc setup using DC1:2, DC2:2.  We want to get rid of DC1.
>  We're in the position where we don't need to save any of the data on DC1.
>  We know we'll lose a (tiny.  already checked) bit of data but our
> processing is such that we'll recover over time.
> How do we drop DC1 and just move forward with DC2?  Using nodetool
> decommision or removetoken looks like we'll eventually end up with a single
> DC1 node containing the entire dc's data which would be slow and costly.
> We've speculated that setting DC1:0 or removing it from the schema would
> do the trick but without finding any hits during searching on that idea I
> hesitate to just do it.  We can drop DC1s data but have to keep a working
> ring in DC2.

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