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From: Richard Low <richard@wentnet.com>
Date: Wed, 14 Aug 2013 20:11:42 +0100
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 <CAAwnuDsBEG1Wwyyjw_c40q6nx4NaY2Fh=Yo9Tfnp3Jata0_EeQ@mail.gmail.com>
Subject: Re: Vnodes, adding a node ?
To: user@cassandra.apache.org
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On 14 August 2013 20:02, Andrew Cobley <a.e.cobley@dundee.ac.uk> wrote:

> I have  small test cluster of 2 nodes.  I ran a stress test on it and with
> nodetool status received the following:
>
> /usr/local/bin/apache-cassandra-2.0.0-rc1/log $ ../bin/nodetool status
> Datacenter: datacenter1
> =======================
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> --  Address       Load       Tokens  Owns (effective)  Host ID
>                   Rack
> UN  192.168.0.11  141.13 MB  256     49.2%
> 4d281e2e-efd9-4abf-bb70-ebdf8e2b4fc3  rack1
> UN  192.168.0.10  145.59 MB  256     50.8%
> 7fc5795a-bd1b-4e42-88d6-024c5216a893  rack1
>
> I then added a third node with no machines writing to the system.  Using
> nodetool status I got the following:
>
> /usr/local/bin/apache-cassandra-2.0.0-rc1/log $ ../bin/nodetool status
> Datacenter: datacenter1
> =======================
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> --  Address       Load       Tokens  Owns (effective)  Host ID
>                   Rack
> UN  192.168.0.11  141.12 MB  256     32.2%
> 4d281e2e-efd9-4abf-bb70-ebdf8e2b4fc3  rack1
> UN  192.168.0.10  145.59 MB  256     35.3%
> 7fc5795a-bd1b-4e42-88d6-024c5216a893  rack1
> UN  192.168.0.12  111.9 KB   256     32.5%
> e5e6d8bd-c652-4c18-8fa3-3d71471eee65  rack1
>
> Is this correct ?  I was under the impression that adding a node to an
> existing cluster would distribute the load around the cluster. Am I perhaps
> missing a step or have a config error perhaps ?
>

How did you add the node?  It looks like it didn't bootstrap but just
joined the ring.  You need to make sure the node is not set as a seed and
that auto_bootstrap is true (the default).

Alternatively, you could run 'nodetool rebuild' to stream data from the
other nodes.

Richard.

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<div dir=3D"ltr">On 14 August 2013 20:02, Andrew Cobley <span dir=3D"ltr">&=
lt;<a href=3D"mailto:a.e.cobley@dundee.ac.uk" target=3D"_blank">a.e.cobley@=
dundee.ac.uk</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=
=3D"gmail_quote">

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">I have =A0small test cluster of 2 nodes. =A0=
I ran a stress test on it and with nodetool status received the following:<=
br>

<br>
/usr/local/bin/apache-cassandra-2.0.0-rc1/log $ ../bin/nodetool status<br>
Datacenter: datacenter1<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
Status=3DUp/Down<br>
|/ State=3DNormal/Leaving/Joining/Moving<br>
-- =A0Address =A0 =A0 =A0 Load =A0 =A0 =A0 Tokens =A0Owns (effective) =A0Ho=
st ID =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Rack<br>
UN =A0192.168.0.11 =A0141.13 MB =A0256 =A0 =A0 49.2% =A0 =A0 =A0 =A0 =A0 =
=A0 4d281e2e-efd9-4abf-bb70-ebdf8e2b4fc3 =A0rack1<br>
UN =A0192.168.0.10 =A0145.59 MB =A0256 =A0 =A0 50.8% =A0 =A0 =A0 =A0 =A0 =
=A0 7fc5795a-bd1b-4e42-88d6-024c5216a893 =A0rack1<br>
<br>
I then added a third node with no machines writing to the system. =A0Using =
nodetool status I got the following:<br>
<br>
/usr/local/bin/apache-cassandra-2.0.0-rc1/log $ ../bin/nodetool status<br>
Datacenter: datacenter1<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
Status=3DUp/Down<br>
|/ State=3DNormal/Leaving/Joining/Moving<br>
-- =A0Address =A0 =A0 =A0 Load =A0 =A0 =A0 Tokens =A0Owns (effective) =A0Ho=
st ID =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Rack<br>
UN =A0192.168.0.11 =A0141.12 MB =A0256 =A0 =A0 32.2% =A0 =A0 =A0 =A0 =A0 =
=A0 4d281e2e-efd9-4abf-bb70-ebdf8e2b4fc3 =A0rack1<br>
UN =A0192.168.0.10 =A0145.59 MB =A0256 =A0 =A0 35.3% =A0 =A0 =A0 =A0 =A0 =
=A0 7fc5795a-bd1b-4e42-88d6-024c5216a893 =A0rack1<br>
UN =A0192.168.0.12 =A0111.9 KB =A0 256 =A0 =A0 32.5% =A0 =A0 =A0 =A0 =A0 =
=A0 e5e6d8bd-c652-4c18-8fa3-3d71471eee65 =A0rack1<br>
<br>
Is this correct ? =A0I was under the impression that adding a node to an ex=
isting cluster would distribute the load around the cluster. Am I perhaps m=
issing a step or have a config error perhaps ?<br></blockquote><div><br>

</div><div>How did you add the node? =A0It looks like it didn&#39;t bootstr=
ap but just joined the ring. =A0You need to make sure the node is not set a=
s a seed and that auto_bootstrap is true (the default).</div><div><br></div=
>

<div>Alternatively, you could run &#39;nodetool rebuild&#39; to stream data=
 from the other nodes.</div><div><br></div><div>Richard.=A0</div></div></di=
v></div>

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