DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 2 pps

... one for handling interaction with the user and SEC. 2. 2 SYSTEM ARCHITECTURES 53 Collaborative Distributed Systems Hybrid structures are notably deployed in collaborative distributed systems. The ... of distributed systems when decisions are taken about where components are placed, for example. We discuss such system architectural issues next. 2. 4 SELF -MANAGEMENT IN DISTRIB...

Ngày tải lên: 08/08/2014, 21:22

... 322 8.1.1 Basic Concepts 322 8.1 .2 Failure Models 324 8.1.3 Failure Masking by Redundancy 326 8 .2 PROCESS RESILIENCE 328 8 .2. 1 Design Issues 328 8 .2. 2 Failure Masking and Replication 330 8 .2. 3 ... SUMMARY 541 12 DISTRIBUTED WEB-BASED SYSTEMS 545 12. 1 ARCHITECTURE 546 12. 1.1 Traditional Web-Based Systems 546 12. 1 .2 Web Services 551 12. 2 PROCESSES 554 12. 2....

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... distributed systems and applications are built directly on top of the sim- ple message-oriented model offered by the transport layer. To better understand and appreciate the message-oriented systems ... be dealt with, and RPC is a widely-used technique that underlies many distributed systems. 4 .2. 1 Basic RPC Operation We first start with discussing conventional procedure cal...

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... values for a2 in range [101 150] and server S 22 for values in [151 20 0]. Then, when the resource gets values (a 1 = 7,a2 = 175), server S 12 and server S 22 will have to be informed. The advantage ... prefix 33 n 320 : a node whose identifier has prefix 320 n 322 : a node whose identifier has prefix 322 n 323 : a node whose identifier has prefix 323 ... [101 20 0]. Assume there...

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... al. (20 05). In the case of DHT-based systems, the basic idea is to reserve a fraction of the identifier space for superpeers. Recall that in DHT-based systems each node receives a random and uniformly ... known as a write-back cache, which is, again, mainly applied in distributed file systems. 26 8 SYNCHRONIZATION CHAP. 6 Figure 6 -22 . Election algorithm in a wireless network, wit...

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... checkpoints and message logging. Elnozahy et al. (20 02) provide a survey of checkpointing and logging in distributed systems. Various algorithmic details can be found in Chow and Johnson (1997). 8.6 .2 ... Fig. 8 -26 . Process Q receives messages m 1 and m 2 from process P and R, respectively, and subsequently sends a message m 3 to R. However, in contrast to all other mess...

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... firewall (Cheswick and Bellovin, 20 00; and Zwicky et aI., 20 00). Essentially, a firewall - disconnects any part of a distributed system from the outside world, as shown in Fig. 9 -28 . All outgoing, ... participate in the attack. Specht and Lee (20 04) distinguish two types of attacks: those aimed at bandwidth depletion and those aimed at resource depletion. Bandwidth depletion...

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... If this 11 DISTRIBUTED FILE SYSTEMS Considering that sharing data is fundamental to distributed systems, it is not surprising that distributed file systems form the basis for many distributed ... systems and applications. In this chapter, we consider distributed file systems as a paradigm for general-purpose distributed systems. 11.1 ARCHITECTURE We start our discussi...

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... 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 distributed...

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