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From Robert Coli <rc...@eventbrite.com>
Subject Re: How to rebalance a cluster?
Date Fri, 07 Mar 2014 19:37:48 GMT
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

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