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Date: Tue, 5 Aug 2014 14:41:00 -0700
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Subject: Re: Make an existing cluster multi data-center compatible.
From: Robert Coli <rcoli@eventbrite.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
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On Tue, Aug 5, 2014 at 2:27 PM, Rene Kochen <rene.kochen@schange.com> wrote:

> "As long as you correctly configure the new snitch so that the replica
> sets do not change, no, you do not need to repair."
>
> Is the following correct:
>
> The replica sets do not change if you modify the snitch from SimpleSnitch
> to NetworkTopologyStrategy and the topology file puts all nodes in the same
> data-center and rack.
>

Yes, you can use nodetool getendpoints to illustrate this programatically.

1) make a set of keys with a key from each range
2) getendpoints for this set of keys
3) change snitch
4) getendpoints again

=Rob

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On T=
ue, Aug 5, 2014 at 2:27 PM, Rene Kochen <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:rene.kochen@schange.com" target=3D"_blank">rene.kochen@schange.com</a>=
&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"">&quot;As lo=
ng as you correctly configure the new snitch so that the replica sets do no=
t change, no, you do not need to repair.&quot;<br>
<br></div>Is the following correct:<br><br>The replica sets do not change i=
f you modify the snitch from SimpleSnitch to NetworkTopologyStrategy and th=
e topology file puts all nodes in the same data-center and rack.<br></div>
</blockquote><div><br></div><div>Yes, you can use nodetool getendpoints to =
illustrate this programatically.</div><div><br></div><div>1) make a set of =
keys with a key from each range</div><div>2) getendpoints for this set of k=
eys</div>
<div>3) change snitch</div><div>4) getendpoints again</div><div><br></div><=
div>=3DRob</div><div>=C2=A0<br></div></div></div></div>

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