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From: Apache Wiki <wikidiffs@apache.org>
To: hadoop-commits@lucene.apache.org
Date: Mon, 02 Jul 2007 13:44:09 -0000
Message-ID: <20070702134409.29282.37315@eos.apache.org>
Subject: [Lucene-hadoop Wiki] Update of "udanax" by udanax

Dear Wiki user,

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The following page has been changed by udanax:
http://wiki.apache.org/lucene-hadoop/udanax

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  == Udanax ==
  
+  * Who : Edward yoon AT NHN,Inc. 
+  * Master of mathematics.
- I have just started writing code for linear algebraic computation on Hadoop + Hbase based parallel machines.[[BR]]
- I think It will makes the hadoop an even better platform for scientific and advanced analytics programming.
- 
- ~+[wiki:HbaseShell HbaseShell]+~
- 
- ----
- 
-  * Who : (Edward yoon) Distributed Computing & Open Collaboration Team AT NHN,Inc.
   * E-mail : [mailto:webmaster@udanax.org webmaster AT SPAMFREE udanax DOT org]
-  * My Homepage : http://www.udanax.org
-  * Hadoop Korean User Group : http://www.hadoop.co.kr
   * My Blog : http://blog.udanax.org/udanax
  
- ----
- 
- '''What is BigTable?'''
- 
- BigTable is a multi-dimensional, sparse map storage with its focus on DFS’s massive data storage and easier data analysis and development. It could also be defined as a distributed database that is more economical than traditional large databases that allows faster analysis on more diverse data. It does not manage every pre-calculation but it stores data in a distributed way with a structure that allows distributed computation. 
- 
- 
- '''Why do we need it?'''
- 
-  * The amount of data is enormous and it grows exponentially. On top of the simple storage needs, we would like to do some data analysis as well. 
-  * We want our DB to be light-weight. We want our DB to adopt to the ever-changing needs and requirements of new services.
- 
- '''Conclusion''' : We want to extract more value out of a company’s data by providing more availability and usability when the company’s needs arise.
- 
- 
- '''An usage example of BigTable – User action log data table for a service'''
- 
- To help make a business decision, to find a way to meet the need of each customer, or to find a product or a market that will bring big profits, we group together action logs of users and create a User Table like the one below. 
- 
- '''''row [ user ], attribute columns [ search history, item buying log, post scrap log, Page Viewing log, User neighborhood (blog), User active part (cafe) ]'''''
- 
- If we select two columns, the fact table in the above schema can be represented in a two-dimensional table.
- [[BR]](Analysis Framework)
- 
- [http://mirror.udanax.org/~udanax/rsync1/blog_udanax_org/udanax/280/o_2.png]
- 
- Who referred to document A?. What other documents do they also like?. What does a user who actively participates in a online community X like to search?. Who are the neighbors of this blog’s author?. What are social distances between them? 
- 
- By finding out where new markets are being formed by managing and analyzing those user-related data, we can analyze the evolution of services faster and more economically. 
-