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From "B. Todd Burruss" <bburr...@real.com>
Subject Re: something bizzare occured
Date Fri, 15 Jan 2010 20:50:44 GMT
that makes sense, but i have had trouble understanding why
hinted-handoff doesn't take care of it?  if not, how many nodes would i
need to prevent this?

thx


On Fri, 2010-01-15 at 12:43 -0800, Jonathan Ellis wrote:
> On Fri, Jan 15, 2010 at 2:39 PM, B. Todd Burruss <bburruss@real.com> wrote:
> > i'm trying to understand why cassandra 0.5 RC3 is behaving like it is.  I
> > have a 5 node cluster, RF=3, W=ALL, R=1.  all is well if all the nodes are
> > running.  if i remove a node, then "puts" fail - doesn't matter which host
> > i'm connected to.  if i restart the node, then all goes back to normal
> > operation.
> >
> > the obvious misunderstanding to me is that i have set W=ALL.  As I
> > understand it, this should mean that the data will be written to ALL the
> > replicas (RF=3) not all the nodes in the cluster.
> 
> Right, but if you take one of the nodes down then it is going to be
> one of the three replicas for 3/5 of your keys.  (Could be more
> depending on your partitioner and whether you balanced your nodes.)
> 
> > i also see the following message upon restarting the node that i stopped -
> > is it a problem?
> 
> No.
> 
> -Jonathan



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