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Performance Challenges for the Open Web Stanford CS193H 29 September 2008.

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Presentation on theme: "Performance Challenges for the Open Web Stanford CS193H 29 September 2008."— Presentation transcript:

1 Performance Challenges for the Open Web Stanford CS193H 29 September 2008

2 Background: making the web work better Ive been abusing web browsers for 15 years I used to work on AJAX / JS performance Video: Now Im helping open up the social web Weekly video podcast: thesocialweb.tv Open Web has new performance challenges Making multiple sites play well together Privacy, transparency, flexibility, simplicity

3 In a world with lots of socially-aware sites…

4 …and lots of open social web building blocks…

5 …how do the pieces fit together? …and what will the new Social Web look like?

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7 Reminder: The social web today is broken… On each site, we still have to: Re-create an account Re-enter our profile info Re-find our friends Re-establish our relationships New social apps have limited options: Create yet-another-silo (and start from scratch) -or- Make a widget inside an existing walled garden

8 …but we know how to make things better!

9 Create a portable, durable online identity OpenID Sign up / sign in with an existing account Link / share your profile data between sites

10 Example: Sign up for Plaxo with OpenID

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14 Create a portable, durable online identity OpenID Sign up / sign in with an existing account Link / share your profile data between sites rel=me (XFN) Consolidate your online identity with me-links Social Graph API See what your users said about themselves

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21 Build and maintain real relationships Contact APIs Find people from your current address book Leverage previously established relationships OAuth Share private data between trusted sites Friends-list portability Continuous discovery across multiple sites

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24 A periodic check of new people from your networks on other sites

25 Stay up-to-date with the people you know OpenSocial Build social apps that can run anywhere

26 OpenSocial

27 OpenSocial: Large and Growing Rapidly

28 Stay up-to-date with the people you know OpenSocial Build social apps that can run anywhere RSS / Atom Syndicate your activity to share with others Jabber (XMPP) Real-time update stream between sites

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34 Building blocks in action: contacts portability User signs in with an OpenID - Site fetches OpenID URL looks for X-XRDS-Location - Site parses XRDS-Simple doc to discover available APIs Site tries to access contacts API gets a WWW-Authenticate response header specifies OAuth - OAuth Discovery (via XRDS) provides OAuth endpoints Site sends user though OAuth flow to grant access - User returns to site with authorized access token - Site can now access users contacts data via API + token

35 Performance Challenges Minimizing round trips Discovery, Association, OpenID, OAuth, etc. Combining steps vs. small pieces loosely joined JSON-RPC in OpenSocial (batching API calls) Caching: freshness vs. performance Policies for how long to store personal data Social Graph API: cached web crawl Server-alerted notifications

36 Performance Challenges (cont.) Pull vs. push: aggregating activity Polling is easy but inefficient & doesnt scale (1000 users every 15 min > 1 hit per sec) XMPP & Gnip: receive update notifications Integrating 3 rd party content Server-side (proxied) vs. client-side (JS onload) Iframe vs. inline New techniques: XFBML, Caja, etc.

37 …so how do these building blocks fit together?

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