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From Wei Zhu <wz1...@yahoo.com>
Subject Re: Benifits by adding nodes to the cluster
Date Wed, 31 Oct 2012 21:43:59 GMT
I heard about virtual nodes. But it doesn't come out until 1.2. Is it easy to convert the existing
installation to use virtual nodes?

Thanks.
-Wei 



________________________________
 From: aaron morton <aaron@thelastpickle.com>
To: user@cassandra.apache.org 
Sent: Wednesday, October 31, 2012 2:23 PM
Subject: Re: Benifits by adding nodes to the cluster
 

I have been told that it's much easier to scale the cluster by doubling the
>number of nodes, since no token changed needed on the existing nodes.Yup.

But if the number of nodes is substantial, it's not realistic to double it
>every time.See the keynote from Jonathan Ellis or the talk on Virtual Nodes from Sam here 
http://www.datastax.com/events/cassandrasummit2012/presentations

virtual nodes make this sort of thing faster and easier


How easy is to add let's say 3 additional nodes to the existing
>10 nodes?In that scenario would would need to move every node. 
But if you have 10 nodes you probably don't want to scale up by 3, I would guess 5 or 10.
Scaling is not something you want to do every day. 

How easy the process is depends on the level of automation in your environment. For example
Ops Centre can automate rebalancing nodes. 

Cheers



-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com 

On 31/10/2012, at 7:14 AM, weiz <wz1975@yahoo.com> wrote:

One follow up questions.
>I have been told that it's much easier to scale the cluster by doubling the
>number of nodes, since no token changed needed on the existing nodes.
>But if the number of nodes is substantial, it's not realistic to double it
>every time. How easy is to add let's say 3 additional nodes to the existing
>10 nodes? I understand the process of moving around data and delete unused
>data. Just want to understand from the operational point of view, how
>difficult is that? We are in the processing of evaluating the nosql
>solution, one important consideration is the operation cost. Any real world
>experience is very much appreciated.
>
>Thanks.
>-Wei 
>
>
>
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>Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.
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