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Date: Thu, 21 Apr 2011 19:58:24 +0530
Message-ID: <BANLkTikCqMQec1P22koaGbMLeS1o36UqbQ@mail.gmail.com>
Subject: How to change the seed node used to discover other nodes in the ring?
From: Roshan Dawrani <roshandawrani@gmail.com>
To: hector-users@googlegroups.com, user@cassandra.apache.org
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Hi,

In our Cassandra/Hector environment, we are trying to turn the
auto-discovery of nodes in the ring on. We have created the DB using the
following default in cassandra.yaml
===============================================================
# Addresses of hosts that are deemed contact points.
# Cassandra nodes use this list of hosts to find each other and learn
# the topology of the ring.  You must change this if you are running
# multiple nodes!
seeds:
    - 127.0.0.1
===============================================================

We don't want 127.0.0.1 to be used as the seed node. Our single node is
setup elsewhere right now.

Changing it in cassandra.yaml is not taking any immediate effect?

Even after changing it in cassandra.yaml, describe cluster continues to show
" b2844cbc-5c62-11e0-9166-e700f669bcfc: [127.0.0.1]"

Does this configuration get stored in some system table? How can I change it
now? Through JMX? Some specific command?

-- 
Roshan
Blog: http://roshandawrani.wordpress.com/
Twitter: @roshandawrani <http://twitter.com/roshandawrani>
Skype: roshandawrani

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Hi,<div><br></div><div>In our Cassandra/Hector environment, we are trying t=
o turn the auto-discovery of nodes in the ring on. We have created the DB u=
sing the following default in cassandra.yaml</div><div>=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D</div>
<div><div># Addresses of hosts that are deemed contact points.</div><div># =
Cassandra nodes use this list of hosts to find each other and learn</div><d=
iv># the topology of the ring. =A0You must change this if you are running</=
div>
<div># multiple nodes!</div><div>seeds:</div><div>=A0=A0 =A0- 127.0.0.1</di=
v><div><div>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div><div></div></div><=
div><br></div><div>We don&#39;t want 127.0.0.1 to be used as the seed node.=
 Our single node is setup elsewhere right now.</div>
<div><br></div><div>Changing it in cassandra.yaml is not taking any immedia=
te effect?</div><div><br></div><div>Even after changing it in cassandra.yam=
l, describe cluster continues to show &quot;=A0b2844cbc-5c62-11e0-9166-e700=
f669bcfc: [127.0.0.1]&quot;</div>
<div><br></div><div>Does this configuration get stored in some system table=
? How can I change it now? Through JMX? Some specific command?</div><div><b=
r></div>-- <br>Roshan<br>Blog: <a href=3D"http://roshandawrani.wordpress.co=
m/" target=3D"_blank">http://roshandawrani.wordpress.com/</a><br>
Twitter: <a href=3D"http://twitter.com/roshandawrani" target=3D"_blank">@ro=
shandawrani</a><br>Skype: roshandawrani<br><br>
</div>

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