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From Jens Rantil <jens.ran...@tink.se>
Subject Re: Decommission datacenter - repair?
Date Sun, 07 Jun 2015 20:42:17 GMT
Ah, that explains things. Thanks!

On Fri, Jun 5, 2015 at 10:59 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> 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
>
>
>


-- 
Jens Rantil
Backend engineer
Tink AB

Email: jens.rantil@tink.se
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