characterizationofdistributedsystems

characterizationofdistributedsystems内容摘要：

（雅虎） ：门户网站  （易航网） ：廉价航空 Examples of distributed systems  Large distributed systems  The Inter, The Intra, Mobile puting  Typical distributed system  DNS service  Distributed file system  New fields in distributed systems  Mobile puting  P2P Applications (BT, eMule)  Distributed systems nearby  Tianwang SE, Maze, Realcourse t h e r e st o f e m a i l se r ve rW e b se r ve rD es k t o pco mp u t er sF i l e se r ve rr o u t e r / f i r e w a llp r i n t a n d o t h e r se r ve r so t h e r se r ve r sp r i n tL o ca l a r e an e t w o r ke m a i l se r ve rt h e In t e r n e tA typical intra  File services  Firewall  The cost of software installation and support Issues in intra  Mobile devices  Laptop puters  Handheld devices  PDA, mobile phone, pager, video camera, digital camera  Wearable devices  . smart watches, digital glasses  Devices embedded in appliances  . washing machines, hifi systems, cars and refrigerators Mobile and ubiquitous puting  Mobile puting (nomadic puting)  Access resources while on the move or in an unusual environment  Locationaware puting: utilize resources that are conveniently nearby  Ubiquitous puting (pervasive puting)  The harnessing of many small, cheap putational devices Mobile and ubiquitous puting (contd.)  Discovery of resources  Eliminating the need for users to reconfigure their mobile devices  To cope with limited connectivity as they travel  Provide privacy and other security guarantees Issues in Mobile and ubiquitous puting L a p t o pM o b i leP r i n t e rC a m e r aI n t e r n e tH o st i n t r a n e tH o m e i n t r a n e tW A P W i r e le ss L A Np h o n eg a t e w a yH o st si t ePotable and handheld devices Examples of distributed systems  Large distributed systems  The Inter, The Intra, Mobile puting  Typical distributed system  DNS service  Distributed file system  New fields in distributed systems  Mobile puting  P2P Applications (BT, eMule)  Distributed systems nearby  Tianwang SE, Maze, Realcourse Issues in Tianwang  增量式搜集，日增百万量级新网页  基于网页内容信息区域的净化与消重  基于混合索引技术的全文检索子系统  基于网页内容和结构信息的结果排序 Maze, a P2P file sharing system 33 Maze architecture Issues in Maze  Maze  10K 用户在线（ 1/10的总用户）  共享的 uniqu。