incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Michael Kjellman <>
Subject Re: num_tokens - virtual nodes
Date Fri, 04 Jan 2013 16:18:51 GMT

From: Alain RODRIGUEZ <<>>
Reply-To: "<>" <<>>
Date: Friday, January 4, 2013 6:00 AM
To: "<>" <<>>
Subject: num_tokens - virtual nodes


I just discover the vnodes new feature described here:

In the post above, Brandon says "If you’d like to upgrade an installation to virtual nodes,
that’s possible too, but I’ll save that for a later post". Does this post now exist somewhere

From the cassandra.yaml:

# If you already have a cluster with 1 token per node, and wish to migrate to
# multiple tokens per node, see
# num_tokens: 256

I see no reference to vnodes or num_tokens on this wiki.

So, how to switch from "physical" nodes to vnodes ?

This is useful only if your number of nodes is greater than the RF, right ?

Why 256 token by default ? Where this value come from ?

Is there more advantage / disadvantage of using vnodes that improving the internodes data
streaming by increasing the number of data sources ?


Southfield Public School students safely access the tech tools they need on and off campus
with the Barracuda Web Filter.

Quick installation and easy to use- try the Barracuda Web Filter free for 30 days:

View raw message