[CCed general@] Mike,
What you are describing is MapReduce application scenario, where the DB is handled from your MR code, nothing special from Hadoop side. Thanks. Alejandro On Wed, Aug 10, 2011 at 5:34 AM, Segel, Mike <mse...@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:tdunn...@maprtech.com] > Sent: Wednesday, August 10, 2011 12:55 AM > To: gene...@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.had...@gmail.com>wrote: > [SNIP] > > > The information contained in this communication may be CONFIDENTIAL and is > intended only for the use of the recipient(s) named above. If you are not > the intended recipient, you are hereby notified that any dissemination, > distribution, or copying of this communication, or any of its contents, is > strictly prohibited. If you have received this communication in error, > please notify the sender and delete/destroy the original message and any > copy of it from your computer or paper files. >
