Understanding SaaS: Software Delivery Model and Evolution

SaaS 1

What is SaaS? 2 Definition :Software as a service a software delivery model in which software and associated data are centrally hosted on the cloud

How SaaS works? 3 SaaS Tradition Company doesn t need to buy the software but rent the software Company need to buy the software (to maintain ,to renew) To renew and to maintain the software is the duty of host Cost more Use internet to achieve Acceptance of risk

History of SaaS 4 1960s- An idea of SaaS has turned up -- there are some different between the concept of SaaS we know today 1990s- The expansion of the Internet during the 1990s brought about a new class of centralized computing -- Goal: reducing costs recently- SaaS become a new popular style for company to work Advantage: reduce costs Risk : data s secret

Challenge in Taiwan 5 The chance is huge but the challenge is huge too 1. Make or change the service according to the buyer's or user's needs 2. Stability of SaaS system 3. Function 4. Data secrete

Examples of SaaS 6 Many companies were customers of modern SaaS system Big software providers tend to connect their products with SaaS

GoogleApps for business 7 Companies subscribed to Google Apps have access to it s mail system and use it as their internal email system without having to buy and implement an independent system within their company.

GoogleApps for business 8 Google provides high level SLA for companies need of reliability and manageability.

Chunghwa telecom - SaaS 9 Chunghwa telecom provide several kinds of SaaS service for different kinds of demands, such as storage management or enterprise resource management

Chunghwa telecom - SaaS Companies like are subscribers to one of it s services, which provides them an easy way to track each store s selling details. 10

Adobe Creative Cloud 11 Started in 2012, Adobe makes their flagship product, the Adobe Creative Suite, online available.

Adobe Creative Cloud 12 All of your work can also be synced to your personal space on the cloud, so they make it possible for you to link all your work from different devices and different software.

NECs C&C cloud 13 NEC provide a Managed Desktop service for companies to reduce the cost of hardware and software.

Microsoft SkyDrive 14 SkyDrive is the online storage service provided by Microsoft Most of the Microsoft product can be connected to the SkyDrive via a Windows live account

Microsoft SkyDrive - Office web apps With the office web apps, we can view and edit common Windows office file using simply your browser, connecting to the SkyDrive allows multiple user to simultaneously interact with the file. 15

Microsoft SkyDrive 16 SkyDrive is integrated with Outlook so user could store the file in the mail on SkyDrive, users using web apps could also edit the file save and directly reply Files on the SkyDrive could also be shared on the social network once the account is integrated

Google Drive 17 Problem: storage network throughput Cloud DFS: parallel read and write

Google Drive 18 Google File System(GFS) BigTable

Google File System(GFS) 19 Proprietary DFS, efficient, reliable access to data using large clusters of commodity hardware Producer-consumer queue Need to support atomicity of data

Google File System(GFS) 20

Google File System(GFS) 21 Master: uses an in-memory index to track the names of data files and the location of their chunks Chunk Servers: store chunks, assigned label, mapping files to chunk Chunk replicates itself at least 3 times

BigTable 22 Compressed, high performance, proprietary data storage system Table-based data store, based on GFS Mostly write once Key-value mapping, 3dimensions- row key, column key, timestamp

BigTable 23 Master server: allocate tablet to tablet server, monitor tablet server(ie. append and delete) Tablet server: read and write to tablets, add and delete tablets depend on loading, doesn t store data, instead, a bridge from Bigtable to GFS

BigTable 24

BigTable 25 Chubby file: location of root tablet Root tablet: location of other tablets, assure the depth of tree unchanged

BigTable and GFS 26 Only GFS know the real location of data, tablet server get all SSTable of tablets, tablet server know where to find data in SSTable by index. Then GFS read SSTable, SSTable may distribute in many chunk servers SSTable: Sorted String Table

Amazon Simple Storage Service(S3) More general purpose data access, ie. Transaction system Need more granular and dynamic access to data, more random access to smaller components(less than 1 MB) Always writeable, highly available for data input Like P2P Consistent hashing 27

Consistent hashing 28 When hash table resized and consistent hashing is used, only K/n keys need to be remapped on average Monotonicity: if new key allocate to hash table, then hash table can assure all keys are mapping to new table Balance

Consistent hashing 29

Consistent hashing 30

Consistent hashing 31

Conclusion 32 Define History Application Microsoft Skydrive Google Drive Amazon S3

33 Thank you for listening