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From Alejandro Abdelnur <t...@cloudera.com>
Subject Re: Derby with Hadoop --Why?
Date Wed, 10 Aug 2011 15:07:40 GMT
[CCed general@]


What you are describing is MapReduce application scenario, where the DB is
handled from your MR code, nothing special from Hadoop side.



On Wed, Aug 10, 2011 at 5:34 AM, Segel, Mike <msegel@navteq.com> wrote:

> Arrgh!
> It's been far too many years since I was handed my diploma and kicked off
> campus. :-)
> IMHO it's a bit esoteric for a class room homework assignment.  Maybe an
> interview question used to stump most of the candidates?
> The funny thing is that on the walk to work, I started to think of if it
> made sense for a certain subset of m/r problems to use derby as an in memory
> db/local lightweight DB
> Ok and before you say WTF, I'm talking about a subset of problems where
> depending on the input to the Mapper.map() method, you may want to do a
> quick look up against a database which contains lookup data that is static
> and is indexed.
> Ok, so maybe I shouldn't read my e-mails before heading off to work... :-)
> -Mike
> -----Original Message-----
> From: Ted Dunning [mailto:tdunning@maprtech.com]
> Sent: Wednesday, August 10, 2011 12:55 AM
> To: general@hadoop.apache.org
> Subject: Re: Derby with Hadoop --Why?
> No.  He meant nothing of the kind.  The other explanations expanded on
> this.
> This sounds like homework.  If so, I would recommend a bit of reading
> before asking.
> On Tue, Aug 9, 2011 at 10:37 PM, Saravana Kumar
> <saravana.hadoop@gmail.com>wrote:
> [SNIP]
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