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Posted to user@cassandra.apache.org by Frank LoVecchio <fr...@isidorey.com> on 2010/10/27 18:26:48 UTC
Adding nodes wrong/data not balanced across nodes
I have 6 nodes, with a RF of 3. I didn't set auto bootstrap to true in the
conf file, is this why I'm getting such non-balanced data storage? I tried
running nodetool loadbalance on the nodes, one by one, but that didn't
really seem to help.
Address Status State Load Token
xxx
node1 Up Normal 3.64 GB xxx
node2 Up Normal 2.81 GB xxx
node3 Up Normal 6.93 GB xxx
node4 Up Normal 8.1 GB xxx
node5 Up Normal 2.78 GB xxx
node6 Up Normal 928.31 MB xxx
Re: Adding nodes wrong/data not balanced across nodes
Posted by Matthew Dennis <md...@riptano.com>.
You need to specify your initial tokens. LoadBalance really doesn't do a
good job of balancing the load. Take a look at "Load Balancing" in
http://wiki.apache.org/cassandra/Operations There is a little python script
in there to help you pick tokens for a given cluster size.
If you don't want to blow away the data you have, then there is more work
involved but basically you want to pick 6 evenly spaced tokens for your ring
and then one-by-one move your nodes to those positions. This is resource
intensive and takes a while so it may be easier to just bring up a new
cluster with the initial tokens correctly specified.
On Wed, Oct 27, 2010 at 11:26 AM, Frank LoVecchio <fr...@isidorey.com>wrote:
> I have 6 nodes, with a RF of 3. I didn't set auto bootstrap to true in the
> conf file, is this why I'm getting such non-balanced data storage? I tried
> running nodetool loadbalance on the nodes, one by one, but that didn't
> really seem to help.
>
> Address Status State Load Token
>
> xxx
> node1 Up Normal 3.64 GB xxx
> node2 Up Normal 2.81 GB xxx
> node3 Up Normal 6.93 GB xxx
> node4 Up Normal 8.1 GB xxx
> node5 Up Normal 2.78 GB xxx
> node6 Up Normal 928.31 MB xxx
>
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