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From Atul Gosain <>
Subject Re: Map Reduce support
Date Sun, 27 Jun 2010 13:53:49 GMT
Thanks for the information Drew and Jonathan.
Is there any difference in performance while using Pig compared to MapReduce
directly on data store ?
I will do the experiments with both of them though in some time.

On Fri, Jun 25, 2010 at 5:46 PM, Drew Dahlke <> wrote:

> The cassandra column family input format will go over a an entire
> column family sending a slice of a row into a mapper at a time. From
> there there's a lot you can do. As far as how you aggregate data
> together, I'd suggest experimenting with the latest version of Pig
> which thankfully supports the new input format. It gives you a
> SQL'esque syntax for manipulating the data and is probably the easiest
> way to experiment.
> On Thu, Jun 24, 2010 at 11:01 AM, Atul Gosain <>
> wrote:
> > Hi
> >   What kind of Map Reduce support is provided for Cassandra ?
> > Can i get some columns from different rows and then aggregate them up
> > together. Its basically aggregation of statistics for various devices
> > connected to a network manager. Is it a right kind of use case to be
> > supported by MR ?
> > Thanks
> > Atul

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