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Date: Sun, 27 Jun 2010 19:23:49 +0530
Message-ID: <AANLkTil5MJQCx3d9tTveGpN0JEhiUI6Y5KBeHkpQeeTJ@mail.gmail.com>
Subject: Re: Map Reduce support
From: Atul Gosain <atul.gosain@gmail.com>
To: user@cassandra.apache.org
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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 <drew.dahlke@bronto.com> 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 <atul.gosain@gmail.com>
> 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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Thanks for the information Drew and Jonathan. <br>Is there any difference i=
n performance while using Pig compared to MapReduce directly on data store =
?<br>I will do the experiments with both of them though in some time. <br>
<br><div class=3D"gmail_quote">On Fri, Jun 25, 2010 at 5:46 PM, Drew Dahlke=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:drew.dahlke@bronto.com">drew.dahlk=
e@bronto.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);=
 padding-left: 1ex;">
The cassandra column family input format will go over a an entire<br>
column family sending a slice of a row into a mapper at a time. From<br>
there there&#39;s a lot you can do. As far as how you aggregate data<br>
together, I&#39;d suggest experimenting with the latest version of Pig<br>
which thankfully supports the new input format. It gives you a<br>
SQL&#39;esque syntax for manipulating the data and is probably the easiest<=
br>
way to experiment.<br>
<div class=3D"im"><br>
On Thu, Jun 24, 2010 at 11:01 AM, Atul Gosain &lt;<a href=3D"mailto:atul.go=
sain@gmail.com">atul.gosain@gmail.com</a>&gt; wrote:<br>
</div><div><div></div><div class=3D"h5">&gt; Hi<br>
&gt; =A0=A0What kind of Map Reduce support is provided for Cassandra ?<br>
&gt; Can i get some columns from different rows and then aggregate them up<=
br>
&gt; together. Its basically aggregation of statistics for various devices<=
br>
&gt; connected to a network manager. Is it a right kind of use case to be<b=
r>
&gt; supported by MR ?<br>
&gt; Thanks<br>
&gt; Atul<br>
</div></div></blockquote></div><br>

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