cloud computing is nothing new. but it changes everything!

© 2003-10, OrangeScape Technologies Limited. Confidential 1

Cloud is nothing new. But it changes everything!

Mani Doraisamy

Chief Technology Officer, OrangeScape

© 2003-10, OrangeScape Technologies Limited. Confidential 2

Owning is the root cause of all “evil”

Businesses shouldn’t own software. They should rent them!

© 2003-10, OrangeScape Technologies Limited. Confidential 3

But, Cloud didn’t invent that idea!

ASPs understood the need. But did not know how to execute it :-(

Cloud ASPs Restaurants

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So what did Cloud invent ?

It invented elasticity

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Why elasticity?

‘Elasticity’ makes ‘Pay-per-use’ (renting) model viable!

Growth Slashdot effectSharing

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Elastic infrastructure is not enough

‘Strength of the chain is the weakest link of the chain’ Platform - Compute, Storage should also be elastic!

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Compute (Application Server) is about Logic & State !

• Stateless● Execute anywhere

(elastic)● High availability● Failover transparency

If ‘state’ is not App Server’s problem, whose problem is it?

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It is Database’s problem!

• Distributed datastore● High scalability● Optimistic concurrency● Now, called ‘NoSQL’

Part of PaaS. IaaS is open about ‘storage’ architecture

As if I don’t have problems already!

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Story without villains ?

• No ‘One Ring to rule them all’● No standard APIs or syntax for queries for NoSQL

• You are with us or against us● Build your app for Enterprise (RDBMS) or for

Cloud (NoSQL)

• Consistency is the ‘usual suspect’● Distributed systems can only satisfy 2 properties

of CAP

• ‘Point of No Return’● Transactions are not atomic across clusters

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What was I saying for the past 45 minutes ?

• Pay-per-use is the business model for Cloud. That is not new

• Cloud invented the technology to make ‘Pay-per-use’ a reality

• The secret sauce is called ‘elasticity’● Servers running app server should expand and shrink back.● That means - App Servers cant maintain ‘State’● That increases load on database - adding to its miseries● Database has to distribute the load to scale – NoSQL

• That gives us new problems to solve● Portability of applications across Clouds and Enterprise● Consistency of RDBMS is not longer ‘a given’

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Shoot your questions!

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