Hadoop vs simple cluster

[Camilo Cruz]

Hello Chuck Lam

im very newbie about distribute computing and have much question

Handopp Hadoop is a software method for clustering?
whats the difference with other commercial products?

could i horizontally-scaling jee applications using handopp Hadoop?

Thank you

[Tibi Kiss]

i don't think so that Hadoop would be a clustering framework for J2EE without redesigning the architecture of the application.

[Chuck Lam]

Yes, you have to rewrite your program to make it work over a cluster (distributed computing). Hadoop is a framework that makes the rewriting easier.

In my book, I gave an example of writing a word counting program. Writing such a program to run on a single machine is easy. Writing it to run on a cluster of machines introduces a lot of complexity. The Hadoop framework eliminates much of that complexity, but the program will have to be architected differently.