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From Oleg Dulin <oleg.du...@gmail.com>
Subject Re: How to rebalance a cluster?
Date Mon, 12 May 2014 14:19:31 GMT
I keep asking same question it seems -- sign of insanity.

Cassandra version 1.2, not using vnodes (legacy).

On 2014-03-07 19:37:48 +0000, Robert Coli said:

> On Fri, Mar 7, 2014 at 6:00 AM, Oleg Dulin <oleg.dulin@gmail.com> wrote:
> I have the following situation:
> 
> 10.194.2.5    RAC1        Up     Normal  378.6 GB        50.00%      
       0
> 10.194.2.4    RAC1        Up     Normal  427.5 GB        50.00%      
  
>     127605887595351923798765477786913079295
> 10.194.2.7    RAC1        Up     Normal  350.63 GB       50.00%      
  
>     85070591730234615865843651857942052864
> 10.194.2.6    RAC1        Up     Normal  314.42 GB       50.00%      
  
>     42535295865117307932921825928971026432
> 
> 
> As you can see, the 2.4 node has over 100 G more data than 2.6 . You 
> can definitely see the imbalance. It also happens to be the heaviest 
> loaded node by CPU usage.
> 
> The first step is to understand why.
> 
> Are you using vnodes? What version of Cassandra?
>  
> What would be a clean way to rebalance ? If I use move operation 
> follwoed by cleanup, would it require a repair afterwards ?
> 
> Move is not, as I understand it, subject to CASSANDRA-2434, so should 
> not require a post-move repair.
> 
> =Rob
>  

L



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