© 2003-10, OrangeScape Technologies Limited. Confidential 1

Evolution of applications - from enterprise to cloud

Mani DoraisamyCo-Founder & Chief Technology Officer, OrangeScape

@manidoraisamy

© 2003-10, OrangeScape Technologies Limited. Confidential 2

Agenda

• Part 1:Enterprise computing in plain English

• Part 2:Journey from the Enterprise to Cloud

© 2003-10, OrangeScape Technologies Limited. Confidential 3

4 years of Computer Science in 2 words:

Process

Data

© 2003-10, OrangeScape Technologies Limited. Confidential 4

What is a process?

Programmer

The magic that controls the processor!

Process

Programminglanguage

© 2003-10, OrangeScape Technologies Limited. Confidential 5

What is data?

Database

Lives inside for years! It is called “durability”

Data

© 2003-10, OrangeScape Technologies Limited. Confidential 6

How do you make the data durable?

Memory

Data is stupid – the “mug up” kind.Vomits whatever was sent inside!

Hard Disk Replicate

© 2003-10, OrangeScape Technologies Limited. Confidential 7

How does process deal with data?

Variables

Process is intelligent. It “makes sense” out of data.We call it the “state”!

Structures

Objects

© 2003-10, OrangeScape Technologies Limited. Confidential 8

Summary of Part 1: Enterprise computing in plain English

It is all about

• How data is stored?

• How data is transformed into state?

• How process deals with state?

© 2003-10, OrangeScape Technologies Limited. Confidential 9

Problem 1: Data representation became a political fight!

Data:Relational Databases

Process:Programming languages

Objects Entities

© 2003-10, OrangeScape Technologies Limited. Confidential 10

Solution: ORM was born!

ORM - Entities to Objects

© 2003-10, OrangeScape Technologies Limited. Confidential 11

Problem 2: HTTP is a born amnesia patient!

HTTP was meant for browsing web pages. Not to serve applications!

This was not my job description!

© 2003-10, OrangeScape Technologies Limited. Confidential 12

Solution: Identify yourselves!

Once the user identifies herself (Photo = SesssionId) the server links it to the “state” in it’s “memory”

Mr. Gajini,I am your girlfriend.You proposed me yesterday. Remember?

Hmm.. I guess so!

© 2003-10, OrangeScape Technologies Limited. Confidential 13

Problem 3: When everyone wants to do the same thing..

Time to buy pop cornduring the movie

- Performance

Time to come outafter the movie

- Scalability

Vs

© 2003-10, OrangeScape Technologies Limited. Confidential 14

Solution: Building bigger exit Vs more exits

Scale up Scale Out

Bigger machine sellers got greedy!

Exit

Scale out replicates “state” into multiple “servers”

© 2003-10, OrangeScape Technologies Limited. Confidential 15

Problem 4: Cloud computing is all about “Sharing”

Sharing needs elasticity!Expand & shrink back, when you don’t need them.

© 2003-10, OrangeScape Technologies Limited. Confidential 16

Solution: You can request anybody!

Move “state” to the database!Now, Send request to any server. Shut down unwanted.

© 2003-10, OrangeScape Technologies Limited. Confidential 17

Problem 5: What does the poor database do?

In addition to more processing machines,App servers start pushing “state” to the database.

© 2003-10, OrangeScape Technologies Limited. Confidential 18

Solution: You know it - Buy more donkeys!

Have a master to manage donkeys (slaves) - PartitioningNoSQL originated from distributing databases.

© 2003-10, OrangeScape Technologies Limited. Confidential 19

What was I saying for the past 1 hour ?

• Both Enterprise & Cloud is about Process & Data● How data is stored?● How data is transformed into state?● How process deals with state?

Entities to Objects(ORM)

State in many servers(Scale out)

Move State to DB(Stateless)

State in App server(Stateful)

Distribute database(NoSQL)

© 2003-10, OrangeScape Technologies Limited. Confidential 20

Shoot your questions!

Twitter: @manidoraisamyBlog: http://manidoraisamy.blogspot.com