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From aaron morton <aa...@thelastpickle.com>
Subject Re: Ec2Snitch + NetworkTopologyStrategy if only in one region?
Date Wed, 13 Apr 2011 02:37:35 GMT
If you can use standard + encoded I would go with that. 

Aaron

On 13 Apr 2011, at 07:07, William Oberman wrote:

> Excellent to know! (and yes, I figure I'll expand someday, so I'm glad I found this out
before digging a hole).
> 
> The other issue I've been pondering is a normal column family of encoded objects (in
my case JSON) vs. a super column.  Based on my use case, things I've read, etc...  right now
I'm coming down on normal + encoded.
> 
> will
> 
> On Tue, Apr 12, 2011 at 2:57 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
> NTS is overkill in the sense that it doesn't really benefit you in a
> single DC, but if you think you may expand to another DC in the future
> it's much simpler if you were already using NTS, than first migrating
> to NTS (changing strategy is painful).
> 
> I can't think of any downsides to using NTS in a single-DC
> environment, so that's the "safe" option.
> 
> On Tue, Apr 12, 2011 at 1:15 PM, William Oberman
> <oberman@civicscience.com> wrote:
> > Hi,
> >
> > I'm getting closer to commiting to cassandra, and now I'm in system/IT
> > issues and questions.  I'm in the amazon EC2 cloud.  I previously used this
> > forum to discover the best practice for disk layouts (large instance + the
> > two ephemeral disks in RAID0 for data + root volume for everything else).
> > Now I'm hoping to confirm bits and pieces of things I've read about for
> > snitch/replication strategies.  I was thinking of using
> > endpoint_snitch: org.apache.cassandra.locator.Ec2Snitch
> > placement_strategy='org.apache.cassandra.locator.NetworkTopologyStrategy'
> > (for people hitting this from the mailing list or google, I feel obligated
> > to note that the former setting is in cassandra.yaml, and the latter is an
> > option on a keyspace).
> >
> > But, I'm only in one region. Is using the amazon snitch/networktopology
> > overkill given everything I have is in one DC (I believe region==DC and
> > availability_zone==rack).  I'm using multiple availability zones for some
> > level of redundancy, I'm just not yet to the point I'm using multiple
> > regions.  If someday I move to using multiple regions, would that change the
> > answer?
> >
> > Thanks!
> >
> > --
> > Will Oberman
> > Civic Science, Inc.
> > 3030 Penn Avenue., First Floor
> > Pittsburgh, PA 15201
> > (M) 412-480-7835
> > (E) oberman@civicscience.com
> >
> 
> 
> 
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
> 
> 
> 
> -- 
> Will Oberman
> Civic Science, Inc.
> 3030 Penn Avenue., First Floor
> Pittsburgh, PA 15201
> (M) 412-480-7835
> (E) oberman@civicscience.com


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