DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 1 pot

... File-Sharing Systems 539 11 .9 SUMMARY 5 41 12 DISTRIBUTED WEB-BASED SYSTEMS 545 12 .1 ARCHITECTURE 546 12 .1. 1 Traditional Web-Based Systems 546 12 .1. 2 Web Services 5 51 12.2 PROCESSES 554 12 .2 .1 Clients ... 9 1. 2.5 Pitfalls 16 1. 3 TYPES OF DISTRIBUTED SYSTEMS 17 1. 3 .1 Distributed Computing Systems 17 1. 3.2 Distributed Information Systems 20 1....

Ngày tải lên: 08/08/2014, 21:22

... m = 8 and k = 3. When looking up the node responsible for a specific key p, we can first decide to route the lookup request to the node responsible for the pattern p AND 11 100000 314 CONSISTENCY AND ... separate criteria are often maintained to classify caching protocols (Min and Baer, 19 92; Lilja, 19 93; and Tartalja and Milutinovic, 19 97). First, caching solutions may d...

Ngày tải lên: 08/08/2014, 21:22

... requests, and hands off such connec- tions to one of the servers (Hunt et al, 19 97; and Pai et al., 19 98). The principle working of what is commonly known as TCP handoff is shown in Fig. 3 -13 . When ... node of the distributed server, as shown in Fig. 3 -14 . To this end, when an access point of a distributed server forwards a request from cli- ent C 1 to, say node S 1 (with...

Ngày tải lên: 08/08/2014, 21:22

... buffer corresponds to 9 seconds of packets to pass to the application. Unfortunately, packet #8 took 11 seconds to reach the receiver, at 12 8 COMMUN1CATION CHAP. 4 Client and Server Stubs The idea ... earlier, if the second parameter (the address of the buffer) happens to be 10 00 on the cli- ent, one cannot just pass the number 10 00 to the server and expect it to work. Address 1...

Ngày tải lên: 08/08/2014, 21:22

... for a 1: Sll takes care of recording values of a1 in [1 5], and S12 for values in [6 10 ]. Likewise, server S 21 records values for a2 in range [10 1 15 0] and server S22 for values in [15 1 200]. ... defined the second to be the time it takes the cesium 13 3 atom to make exactly 9 ,19 2,6 31, 770 transitions. The choice of 9 ,19 2,6 31, 770 was made to make the atomic second e...

Ngày tải lên: 08/08/2014, 21:22

... checkpoints and message logging. Elnozahy et al. (2002) provide a survey of checkpointing and logging in distributed systems. Various algorithmic details can be found in Chow and Johnson (19 97). 8.6.2 ... works as shown in Fig. 8 -11 . Figure 8 -11 . The essence of hierarchical reliable multicasting. Each local coor- dinator forwards the message to its children and later handles r...

Ngày tải lên: 08/08/2014, 21:22

... capability), and then runs the result through a one-way function. 444 DISTRIBUTED OBJECT-BASED SYSTEMS CHAP. 10 Object orientation began to be used for developing distributed systems in the 19 80s. ... into the key exchange taking place between Alice and Bob, and subsequently ruin the security. Explain how this would work. SEC. 10 .1 ARCHITECTURE 4 51 The control. subobjec...

Ngày tải lên: 08/08/2014, 21:22

... in Fig. 11 -13 . 502 DISTRIBUTED FILE SYSTEMS CHAP. 11 11 .3 COMMUNICATION As with processes, there is nothing particularly special or unusual about com- munication in distributed file systems. ... successfully opens a file 1, an entire copy of f is transferred to the client's 512 DISTRIBUTED FILE SYSTEMS CHAP. 11 Figure 11 -14 . Using symbolic links with automounting...

Ngày tải lên: 08/08/2014, 21:22

... document is changed. a DISTRIBUTED WEB-BASED SYSTEMS CHAP. 12 564 DISTRIBUTED WEB-BASED SYSTEMS CHAP. 12 Figure 12 -12 . (a) HTTP request message. (b) HTTP response message. Fig. 12 -13 shows a number ... 566 DISTRIBUTED WEB;.BASED SYSTEMS CHAP. 12 12 .3.2 Simple Object Access Protocol Where HTTP is the standard communication protocol for traditional Web- based distribute...

Ngày tải lên: 08/08/2014, 21:22