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Date: Fri, 28 Aug 2015 14:12:00 -0400
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 <CAJpqPhgahUz7X9FBw0uc47N6v21LF6JQO_8Xyxx33OyOZfezGw@mail.gmail.com>
Subject: Fwd: Re : Restoring nodes in a new datacenter, from snapshots in an
 existing datacenter
From: sai krishnam raju potturi <pskraju88@gmail.com>
To: user@cassandra.apache.org
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hi;
     We have cassandra cluster with Vnodes spanning across 3 data centers.
We take backup of the snapshots from one datacenter.
   In a doomsday scenario, we want to restore a downed datacenter, with
snapshots from another datacenter. We have same number of nodes in each
datacenter.

1 : We know it requires copying the snapshots and their corresponding token
ranges to the nodes in new datacenter, and running nodetool refresh.

2 : The question is, we will now have 2 datacenters, with the same exact
token ranges. Will that cause any problem.

DC1 : Node-1 : token1......token10
      Node-2 : token11 .....token20
      Node-3 : token21 ..... token30
      Node-4 : token31 ..... token40

 DC2 : Node-1 : token1.....token10
       Node-2 : token11....token20
       Node-3 : token21....token30
       Node-4 : token31....token40


thanks
Sai

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<div dir=3D"ltr"><div class=3D"gmail_quote"><br><div dir=3D"ltr">hi;<div>=
=C2=A0 =C2=A0 =C2=A0We have cassandra cluster with Vnodes spanning across 3=
 data centers. We take backup of the snapshots from one datacenter.</div><d=
iv>=C2=A0 =C2=A0In a doomsday scenario, we want to restore a downed datacen=
ter, with snapshots from another datacenter. We have same number of nodes i=
n each datacenter.</div><div><br></div><div>1 : We know it requires copying=
 the <span style=3D"background-color:rgb(255,255,0)">snapshots</span> and t=
heir <span style=3D"background-color:rgb(255,255,0)">corresponding token ra=
nges</span>=C2=A0to the nodes in new datacenter, and running nodetool refre=
sh.</div><div><br></div><div>2 : The question is, we will now have 2 datace=
nters, with the same exact token ranges. Will that cause any problem.=C2=A0=
</div><div><br></div><div><pre style=3D"margin-top:0px;padding:5px;border:0=
px;font-size:13px;overflow:auto;width:auto;max-height:600px;font-family:Con=
solas,Menlo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;=
DejaVu Sans Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,&#39;Courier New&#=
39;,monospace,sans-serif;word-wrap:normal;background-color:rgb(238,238,238)=
"><code style=3D"margin:0px;padding:0px;border:0px;font-family:Consolas,Men=
lo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;DejaVu Sa=
ns Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,&#39;Courier New&#39;,monos=
pace,sans-serif;white-space:inherit">DC1 : Node-1 : token1......token10
      Node-2 : token11 .....token20
      Node-3 : token21 ..... token30
      Node-4 : token31 ..... token40

 DC2 : Node-1 : token1.....token10
       Node-2 : token11....token20
       Node-3 : token21....token30
       Node-4 : token31....token40</code></pre></div><div><br></div><div>th=
anks</div><span class=3D"HOEnZb"><font color=3D"#888888"><div>Sai=C2=A0</di=
v><div><br></div><div><br></div></font></span></div>
</div><br></div>

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