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From Alexander Dejanovski <a...@thelastpickle.com>
Subject Re: Changing existing Cassandra cluster from single rack configuration to multi racks configuration
Date Wed, 06 Mar 2019 12:20:13 GMT
Hi Manish,

the best way, if you have the opportunity to easily add new
hardware/instances, is to create a new DC with racks and switch traffic to
the new DC when it's ready (then remove the old one). My co-worker Alain
just wrote a very handy blog post on that technique :
http://thelastpickle.com/blog/2019/02/26/data-center-switch.html

If you can't, then I guess you can for each node (one at a time),
decommission it, wipe it clean and re-bootstrap it after setting the
appropriate rack.
Also, take into account that your keyspaces must use the
NetworkTopologyStrategy so that racks can be taken into account. Change the
strategy prior to adding the new nodes if you're currently using
SimpleStrategy.

You cannot (and shouldn't) try to change the rack on an existing node (the
GossipingPropertyFileSnitch won't allow it).

Cheers,

On Wed, Mar 6, 2019 at 12:15 PM manish khandelwal <
manishkhandelwal03@gmail.com> wrote:

> We have a 6 node Cassandra cluster in which all the nodes  are in same
> rack in a dc. We want to take advantage of "multi rack" cluster (example:
> parallel upgrade on all the nodes in same rack without downtime). I would
> like to know what is the recommended process to change an existing cluster
> with single racks configuration to multi rack configuration.
>
>
> I want to introduce 3 racks with 2 nodes in each rack.
>
>
> Regards
> Manish
>
> --
-----------------
Alexander Dejanovski
France
@alexanderdeja

Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com

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