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SaaS傅汝緯 李碩元 林子驥

2 What is SaaS?

Definition :Software as a service

a software delivery model in which software and associated data are centrally hosted on the cloud

傅汝緯 李碩元 林子驥

3 How SaaS works?Tradition

Company need to buy the software (to maintain ,to renew)

Cost more

Acceptance of risk

SaaS Company doesn’t need to buy

the software but rent the software

To renew and to maintain the software is the duty of host

Use internet to achieve

傅汝緯 李碩元 林子驥

4 History of SaaS 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

傅汝緯 李碩元 林子驥

5 Challenge in Taiwan 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

傅汝緯 李碩元 林子驥

6 Examples of SaaS Many companies were customers of

modern SaaS system

Big software providers tend to connect their products with SaaS

傅汝緯 李碩元 林子驥

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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.

Google Apps for business

傅汝緯 李碩元 林子驥

8 Google Apps for business

Google provides high level SLA for companies’ need of reliability and manageability.

傅汝緯 李碩元 林子驥

9 Chunghwa telecom - SaaS 雲

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

傅汝緯 李碩元 林子驥

10 Chunghwa telecom - SaaS 雲

Companies like 丐幫滷味 are subscribers to one of it’s services, which provides them an easy way to track each store’s selling details.

傅汝緯 李碩元 林子驥

11 Adobe Creative Cloud Started in 2012, Adobe makes their

flagship product, the Adobe Creative Suite, online available.

傅汝緯 李碩元 林子驥

12 Adobe Creative Cloud 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.

傅汝緯 李碩元 林子驥

13 NEC’s C&C cloud NEC provide a Managed Desktop service

for companies to reduce the cost of hardware and software.

傅汝緯 李碩元 林子驥

14 Microsoft SkyDrive 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

傅汝緯 李碩元 林子驥

15 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.

傅汝緯 李碩元 林子驥

16 Microsoft SkyDrive 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

傅汝緯 李碩元 林子驥

17 Google Drive

Problem: storage network throughput

Cloud DFS: parallel read and write

傅汝緯 李碩元 林子驥

18 Google Drive

Google File System(GFS)

BigTable

傅汝緯 李碩元 林子驥

19 Google File System(GFS)

Proprietary DFS, efficient, reliable access to data using large clusters of commodity hardware

Producer-consumer queue Need to support atomicity of data

傅汝緯 李碩元 林子驥

20 Google File System(GFS)

傅汝緯 李碩元 林子驥

21 Google File System(GFS)

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

傅汝緯 李碩元 林子驥

22 BigTable 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

傅汝緯 李碩元 林子驥

23 BigTable 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

傅汝緯 李碩元 林子驥

24 BigTable

傅汝緯 李碩元 林子驥

25 BigTable Chubby file: location of root tablet

Root tablet: location of other tablets, assure the depth of tree unchanged

傅汝緯 李碩元 林子驥

26 BigTable and GFS 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

傅汝緯 李碩元 林子驥

27 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 傅汝緯 李碩元 林子驥

28 Consistent hashing 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

傅汝緯 李碩元 林子驥

29 Consistent hashing

傅汝緯 李碩元 林子驥

30 Consistent hashing

傅汝緯 李碩元 林子驥

31 Consistent hashing

傅汝緯 李碩元 林子驥

32 Conclusion Define History Application Microsoft Skydrive Google Drive Amazon S3

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Thank you for listening