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From Sunil Khedar <su...@truesparrow.com>
Subject Re: Configuring Cassandra
Date Wed, 09 Dec 2009 14:10:59 GMT
And while adding 2nd DC we have to make sure that, nodes along the ring
should alternate data centers to avoid hot spots. As you explained in
http://wiki.apache.org/cassandra/Operations

And that can be a tricky. Correct?

Thanks,
Sunil

On Wed, Dec 9, 2009 at 7:06 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> It should work, but because of the way RAS works you need to have
> equal nodes in DCs for it to be balanced.  so, when you do decide to
> add the 2nd DC, you should add as many nodes as you have in the first.
>
> On Wed, Dec 9, 2009 at 4:27 AM, Sunil Khedar <sunil@truesparrow.com>
> wrote:
> > "Replication strategy may not be changed without wiping your data and
> > starting over."
> >
> > To start with I want to have all my nodes in a single DC. But over a time
> of
> > period, nodes will be placed in multiple DCs. In that is it safe to start
> > using "RackAwareStrategy" even if nodes are in a single DC? So, that when
> I
> > start using multiple DCs, data wiping won't be required.
> >
> > -Sunil
> >
> > On Wed, Dec 9, 2009 at 4:27 AM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
> >>
> >> On Tue, Dec 8, 2009 at 7:21 AM, Rakesh Sharma <rakrma@gmail.com> wrote:
> >> > f) Can I take backups from each node and merge them on a single node?
> Or
> >> > it's not at all required?
> >>
> >> All you would need to do would be to copy the snapshotted sstables
> >> into the data directory on the target node, but I'm not sure why you
> >> would want to do that.
> >>
> >> I wrote http://wiki.apache.org/cassandra/Operations to answer the
> >> other questions in more detail. :)
> >>
> >> -Jonathan
> >
> >
>

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