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From Robert Coli <rc...@eventbrite.com>
Subject Re: Decommission datacenter - repair?
Date Fri, 05 Jun 2015 20:59:45 GMT
On Fri, Jun 5, 2015 at 5:15 AM, Jens Rantil <jens.rantil@tink.se> wrote:

> Datastax's documentation on "Decommissioning a data center
> <http://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_decomission_dc_t.html>"
> tells me to run a full repair and then decommission each node. Isn't
> decommissioning going to hand over all data anyway? Then why is the repair
> necessary?
>

In step 3 of those instructions you reduce the number of replicas in the
departing DC to 0.

The departing DC no longer owns ranges at this point, and no longer is
responsible for replicas.

It therefore does no streaming (except maybe hints?) when you decommission
nodes.

=Rob

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