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From amulya rattan <talk2amu...@gmail.com>
Subject Re: load balance issue
Date Tue, 06 Sep 2011 05:16:41 GMT
This is golden! thanks a heap guys

On Mon, Sep 5, 2011 at 6:07 PM, Nick Bailey <nick@datastax.com> wrote:

> You can place each of the 4 new nodes exactly in the middle of 2 of
> the current nodes. This way each node will still be responsible for
> the same amount of data but your old nodes did not move.
>
> On Mon, Sep 5, 2011 at 2:56 PM, amulya rattan <talk2amulya@gmail.com>
> wrote:
> > Ah, missed that. Thanks for the pointer.
> > While we are at it, the doc says that if I am doubling the strength of my
> > cluster, and I assign calculated tokens to the new nodes, i don't need to
> do
> > the nodetool move for old nodes. Won't I have to assign the old nodes
> with
> > their new respective tokens too? If I had 4 nodes and I add 4 more, the
> > token distribution for each node changes. Then how could I get away with
> not
> > assigning old nodes with new tokens?
> > ~Amulya
> >
> > On Mon, Sep 5, 2011 at 4:12 AM, Sylvain Lebresne <sylvain@datastax.com>
> > wrote:
> >>
> >> Have you done step 6 of the 'To add nodes to a Cassandra cluster' of
> >> http://www.datastax.com/docs/0.8/operations/clustering#adding-capacity,
> >> aka, run nodetool cleanup on the previously existing nodes ?
> >>
> >> --
> >> Sylvain
> >>
> >> On Sun, Sep 4, 2011 at 11:58 AM, amulya rattan <talk2amulya@gmail.com>
> >> wrote:
> >> > Hi there,
> >> > I had a 3 nodes ring, added a 4th one,  and moved others to
> appropriate
> >> > tokens..doing nodetool ring shows:
> >> > 127.0.0.1       datacenter1 rack1       Up     Normal  348.82 MB
> >> > 25.00%  0
> >> > 127.0.0.2       datacenter1 rack1       Up     Normal  349.81 MB
> >> > 25.00%  42535295865117307932921825928971026432
> >> > 127.0.0.3       datacenter1 rack1       Up     Normal  437.04 MB
> >> > 25.00%  85070591730234615865843651857942052864
> >> > 127.0.0.4       datacenter1 rack1       Up     Normal  261.74 MB
> >> > 25.00%  127605887595351923798765477786913079296
> >> > Although it shows 25% on all nodes, the data distribution seems
> totally
> >> > unbalanced, how did that happen?
> >> > Also if I happen to have a thousand node cluster, and add another 100
> >> > nodes,
> >> > is it ok to start moving all nodes to their respective new tokens
> >> > simultaneously or one-by-one?
> >> > Any response is appreciated.
> >> > ~Amulya
> >
> >
>

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