im a newbie but maybe this will also add some value...
it is my understanding that mapreduce is like a distributed group by
statement
when you run a statement like this against your petabyes of dataset it can
take a long time.. first and foremost because the first thing you have to
do before you apply the group by logic is to read the data off disk.
if your disk reads at 100/MBs then you can do the math.
The time frame that this query will run take at least this long to complete.
If you need this info really fast like in the next hour to support i dunno
personalization features on a ecommerce site or month end report that needs
to be complete in 2 hours.
Then it would be nice to put equal parts of your data on 100s of disks and
run the same algorithm in parralel
but thats just if your bottleneck is disk.
what if your dataset is relatively small but calculations done on each
element coming in is large
so therefore your bottleneck there is CPU power
there are alot of bottlenecks you could run into.
number of threads
memory
latency of remote apis or remote database you hit as you analyze the data
Theres a book called programming collective intelligence from oreilly that
should help you out too
http://shop.oreilly.com/product/9780596529321.do
On Tue, May 21, 2013 at 11:02 PM, Sai Sai saigr...@yahoo.in wrote:
Excellent Sanjay, really excellent input. Many Thanks for this input.
I have been always thinking about some ideas but never knowing what to
proceed with.
Thanks again.
Sai
--
*From:* Sanjay Subramanian sanjay.subraman...@wizecommerce.com
*To:* user@hadoop.apache.org user@hadoop.apache.org
*Sent:* Tuesday, 21 May 2013 11:51 PM
*Subject:* Re: Project ideas
+1
My $0.02 is look look around and see problems u can solve…Its better to
get a list of problems and see if u can model a solution using map-reduce
framework
An example is as follows
PROBLEM
Build a Cars Pricing Model based on advertisements on Craigs list
OBJECTIVE
Recommend a price to the Craigslist car seller when the user gives info
about make,model,color,miles
DATA required
Collect RSS feeds daily from Craigs List (don't pound their website , else
they will lock u down)
DESIGN COMPONENTS
- Daily RSS Collector - pulls data and puts into HDFS
- Data Loader - Structures the columns u need to analyze and puts into HDFS
- Hive Aggregator and analyzer - studies and queries data and brings out
recommendation models for car pricing
- REST Web service to return query results in XML/JSON
- iPhone App that talks to web service and gets info
There u go…this should keep a couple of students busy for 3 months
I find this kind of problem statement and solutions simpler to
understand because its all there in the real world !
An example of my way of thinking led to me founding this non profit
called www.medicalsidefx.org that gives users valuable metrics regarding
medical side fx.
It uses Hadoop to aggregate , Lucene to search….This year I am redesigning
the core to use Hive :-)
Good luck
Sanjay
From: Michael Segel michael_se...@hotmail.com
Reply-To: user@hadoop.apache.org user@hadoop.apache.org
Date: Tuesday, May 21, 2013 6:46 AM
To: user@hadoop.apache.org user@hadoop.apache.org
Subject: Re: Project ideas
Drink heavily?
Sorry.
Let me rephrase.
Part of the exercise is for you, the student to come up with the idea.
Not solicit someone else for a suggestion. This is how you learn.
The exercise is to get you to think about the following:
1) What is Hadoop
2) How does it work
3) Why would you want to use it
You need to understand #1 and #2 to be able to #3.
But at the same time... you need to also incorporate your own view of
the world.
What are your hobbies? What do you like to do?
What scares you the most? What excites you the most?
Why are you here?
And most importantly, what do you think you can do within the time period.
(What data can you easily capture and work with...)
Have you ever seen 'Eden of the East' ? ;-)
HTH
On May 21, 2013, at 8:35 AM, Anshuman Mathur ans...@gmail.com wrote:
Hello fellow users,
We are a group of students studying in National University of Singapore.
As part of our course curriculum we need to develop an application using
Hadoop and map-reduce. Can you please suggest some innovative ideas for
our project?
Thanks in advance.
Anshuman
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