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From: Eric Stevens <mightye@gmail.com>
Date: Fri, 21 Jun 2013 08:25:54 -0400
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 <CAORswtya8wew8ojoB4-dK-gpuJYBavxC=PFuN14DkQO=O0jxng@mail.gmail.com>
Subject: Re: [Cassandra] Replacing a cassandra node
To: user@cassandra.apache.org
Cc: Emalayan Vairavanathan <svemalayan@yahoo.com>
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Is there a way to replace a failed server using vnodes?  I only had
occasion to do this once, on a relatively small cluster.  At the time I
just needed to get the new server online and wasn't concerned about the
performance implications, so I just removed the failed server from the
cluster and bootstrapped a new one.  Of course that caused a bunch of key
reassignments, so I'm sure it would be less work for the cluster if I could
bring a new server online with the same vnodes as the failed server.


On Thu, Jun 20, 2013 at 2:40 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Thu, Jun 20, 2013 at 10:40 AM, Emalayan Vairavanathan
> <svemalayan@yahoo.com> wrote:
> > In the case where replace a cassandra node (call it node A) with another
> one
> > that has the exact same IP (ie. during a node failure), what exactly
> should
> > we do?  Currently I understand that we should at least run "nodetool
> > repair".
>
> If you lost the data from the node, then what you want is "replace_token."
>
> If you didn't lose the data from the node (and can tolerate stale
> reads until the repair completes) you want to start the node with
> auto_bootstrap set to false and then repair.
>
> =Rob
>

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<div dir=3D"ltr">Is there a way to replace a failed server using vnodes? =
=C2=A0I only had occasion to do this once, on a relatively small cluster. =
=C2=A0At the time I just needed to get the new server online and wasn&#39;t=
 concerned about the performance implications, so I just removed the failed=
 server from the cluster and bootstrapped a new one. =C2=A0Of course that c=
aused a bunch of key reassignments, so I&#39;m sure it would be less work f=
or the cluster if I could bring a new server online with the same vnodes as=
 the failed server.</div>

<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Thu, Jun 2=
0, 2013 at 2:40 PM, Robert Coli <span dir=3D"ltr">&lt;<a href=3D"mailto:rco=
li@eventbrite.com" target=3D"_blank">rcoli@eventbrite.com</a>&gt;</span> wr=
ote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On Thu, Jun 20, 2013 at 10=
:40 AM, Emalayan Vairavanathan<br>
&lt;<a href=3D"mailto:svemalayan@yahoo.com">svemalayan@yahoo.com</a>&gt; wr=
ote:<br>
&gt; In the case where replace a cassandra node (call it node A) with anoth=
er one<br>
&gt; that has the exact same IP (ie. during a node failure), what exactly s=
hould<br>
&gt; we do? =C2=A0Currently I understand that we should at least run &quot;=
nodetool<br>
&gt; repair&quot;.<br>
<br>
</div>If you lost the data from the node, then what you want is &quot;repla=
ce_token.&quot;<br>
<br>
If you didn&#39;t lose the data from the node (and can tolerate stale<br>
reads until the repair completes) you want to start the node with<br>
auto_bootstrap set to false and then repair.<br>
<br>
=3DRob<br>
</blockquote></div><br></div>

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