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From Gurpreet Singh <gurpreet.si...@gmail.com>
Subject Re: questions on cassandra (repair and multi-datacenter)
Date Fri, 17 Sep 2010 06:56:05 GMT
Thanks Benjamin. I realised that, i have reverted using cleanup, got it back
to old state and testing the scenario exactly the way you put it.

On Thu, Sep 16, 2010 at 10:56 PM, Benjamin Black <b@b3k.us> wrote:

> On Thu, Sep 16, 2010 at 3:19 PM, Gurpreet Singh
> <gurpreet.singh@gmail.com> wrote:
> > 1.  I was looking to increase the RF to 3. This process entails changing
> the
> > config and calling repair on the keyspace one at a time, right?
> > So, I started with one node at a time, changed the config file on the
> first
> > node for the keyspace, restarted the node. And then called a nodetool
> repair
> > on the node.
>
> You need to change the RF on _all_ nodes in the cluster _before_
> running repair on _any_ of them.  If nodes disagree on which nodes
> should have replicas for keys, repair will not work correctly.
> Different RF for the same keyspace creates that disagreement.
>
>
> b
>

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