Managing Online Services

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Presentation transcript:

Managing Online Services Jennifer Rexford Fall 2010 (TTh 1:30-2:50 in COS 302) COS 561: Advanced Computer Networks http://www.cs.princeton.edu/courses/archive/fall10/cos561/

Challenging Services multiple servers, multiple locations 3G WiFi A service running on multiple servers in multiple data centers, serving multiple users in different locations. Users may be multi-homed and mobile, and their link bandwidth may vary. WiFi mobile host

real-time video streams (e.g., IPTV) Challenging Services real-time video streams (e.g., IPTV) multiple receivers, dynamic join/leave . . .

Today’s Internet Architecture Best-effort, unicast packet-delivery service Though some services need real-time performance Though some services need multicast or anycast IP addresses correspond to a fixed machine Location-dependent Addresses a single point-of-attachment Visible to applications Domain names Variable length Name a machine, not a service Early binding of name to IP address

Questions Directing client requests to server replicas Seamless client and/or server mobility Directing the same content to many clients Real-time applications Adapting services to client’s geographic location How to address these issues today? How to change the Internet architecture to make them easier?