Cloud computing @ slideshare

Cloud Computingand its usage at Slideshare

-- Akash Agrawal

what the heck is

Cloud Computing?

Move to a new place?

You can either

Build a house or

Rent an apartment

• Size

Problems in building a new house

• Size• Customization


• Size• Customization• Maintenance


Why

Slideshare uses cloud computing?

Faster• Infrastructure on demand• Provision via APIs, not phone calls• Snapshot, clone and go. Repeat.

Cheaper• Reduced need for capital• OpEx not CapEx• Barrier to entry is much lower

Better• Focus on your core business• Infrastructure isn’t your

problem

How do we see it?

FAST

ELASTIC

What do we use?

Amazon Web Services (AWS)

• S3 (Storage)• EC2 (Computing)• SQS (Messaging)

What do we use?

Amazon Web Services (AWS)

• S3 (Storage)• EC2 (Computing)• SQS (Messaging)• SNS (Notification)• SDB (NoSQL DB)

Simple Storage Service (S3)

Storage is organized in buckets• Like a namespace for the objects it contains• Accessible via

http://bucketname.s3.amazonaws.com

It’s not file storage; it’s a key-value store

• Like a big hash table or dictionary• Number of objects you can store is unlimited• Key-value pairs• Accessible via

http://bucketname.s3.amazonaws.com/keyname

Simple Storage Service (S3)

• Implicit BitTorrent seeding for all keys• 5TB limit for each key• Official API to operate on buckets in different

languages and for different platforms• Public, private and other custom access for keys• You may choose what kind of reliability you

want; more reliable more cost, less reliable less cost

Reduced Redundancy Storage (RRS)

• Standard Storage provides 99.999999999% durability

• $0.140 / GB for first 1 TB / month

• RRS provides 99.99% durability• $0.093 / GB for first 1 TB / month

S3 as Website

Redirection from S3

<html><head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-

1"> <META HTTP-EQUIV="Refresh" CONTENT="1; URL=http://tech-

queries.blogspot.com/"><title>Programming Interviews</title></head></html>

Try accessing http://slideshare.s3.amazonaws.com/test.jpg

http://slideshare.s3.amazonaws.com/test.jpg

Simple Queue Service (SQS)

• storing messages as they travel between computers

• move data between distributed components• Doesn’t require each component to be always

available• 64 KB for a single message• Queue length can be infinite.• Messages can be retained in queues for up to 14

days• Messages can be sent and read simultaneously

Visibility Timeout (SQS)

Visibility Timeout (SQS)

• Keeps multiple computers from processing the same message at once.

• If this system fails to process the message, then it will be read by another call as soon as the visibility timeout passes.

SQS is not FIFO

Simple Notification Service (SNS)


• Topics• Owners• Subscribers• Publishers


• HTTP• HTTPS• Email• Email (json)• SQS• SMS


• Monitoring alert system (like Nagios)• News Distribution• EC2 control• Start stop services

Reduce cost using

SNS – RRS Integration

Amazon SimpleDB (SDB)

• Highly available, flexible, and scalable non-relational data store

• No-touch scaling• No need to anticipate and respond to changes in

request load or database utilization• No rigid Schema• Data is stored as key-value pairs • No normalization, joints, schemas etc as we see

in a relational DB


• Domain (table) • A maximum of 250 domains of 10 GB each

• Item (row) • Item is identified by a unique key or

identifier)

• Attribute (column)

• Value


Demo

Questions?

Technology

Cloud computing @ slideshare