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From Ariel Weisberg <ar...@weisberg.ws>
Subject Re: DSE Hadoop support for provisioning hardware
Date Tue, 11 Mar 2014 16:01:43 GMT
Hi,

Thanks that answers my question.

Ariel

On Tue, Mar 11, 2014, at 11:48 AM, Jeremiah D Jordan wrote:
> Ariel,
> DSE lets you specify an "Analytics" virtual data center.  You can then
> replicate your keyspaces over to that data center, and run your Analytics
> jobs against it, and as long as they are using the LOCAL_ consistency
> levels, they won't be hitting your real time nodes, and vice versa.  So
> the Cassandra "multiple data center" capabilities are used to separate
> your OLTP stuff and Analytics stuff from interfering with each other, but
> the data in each is seamlessly replicated so that both are always up to
> date, without you having to write ETL code.
> 
> Does that answer your question?
> 
> -Jeremiah
> 
> 
> On Mar 11, 2014, at 10:27 AM, Ariel Weisberg <ariel@weisberg.ws> wrote:
> 
> > Hi,
> > 
> > I am doing a presentation at Big Data Boston about how people are
> > bridging the gap between OLTP and ingest side databases and their
> > analytic storage and queries. One class of systems I am talking about
> > are things like HBase and DSE that let you run map reduce against your
> > OLTP dataset.
> > 
> > I remember reading at some point that DSE allows you to provision
> > dedicated hardware for map reduce, but the docs didn't seem to fully
> > explain how that works.I looked at
> > http://www.datastax.com/documentation/datastax_enterprise/4.0/datastax_enterprise/ana/anaStrt.html
> > 
> > My question is what kind of provisioning can I do? Can I provision
> > dedicated hardware for just the filesystem or can I also provision
> > replicas that are dedicated to the file system and also serving reads
> > for map reduce jobs. What kind of support is there for keeping OLTP
> > reads from hitting the Hadoop storage nodes and how does this relate to
> > doing quorum reads and writes?
> > 
> > Thanks,
> > Ariel
> 

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