DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 7 pdf

... the 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 1980s. ... generation of distributed systems. In this section, we will first take a deeper look into the general architecture of object-based distributed systems, after which we can se...

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... Wireless Environments 2 67 6.5.3 Elections in Large-Scale Systems 269 6.6 SUMMARY 270 7 CONSISTENCY AND REPLICATION 273 - 7. 1 INTRODUCTION 274 7. 1.1 Reasons for Replication 274 7. 1.2 Replication as ... Scaling Technique 275 7. 2 DATA-CENTRIC CONSISTENCY MODELS 276 7. 2.1 Continuous Consistency 277 7. 2.2 Consistent Ordering of Operations 281 7. 3 CLIENT-CENTRIC CONSISTENCY M...

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... 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 ... architectures and software architectures. On the one hand, we need to organize the components of a distributed system such that monitoring and adjustments can be done, while on the...

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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 ... execu- tion mode of the sender and receiver, as shown in Fig. 4- 17. In Fig.4- 17( a), both the sender and receiver execute during the entire transmission of a message. In.Fig....

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... defined the second to be the time it takes the cesium 133 atom to make exactly 9,192,631 ,77 0 transitions. The choice of 9,192,631 ,77 0 was made to make the atomic second equal to the mean solar second ... anything to do with papal decrees and did not accept the Gregorian calendar for 170 years. Figure 6-3. TAl seconds are of constant length, unlike solar seconds. Leap seconds are i...

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... the issue of how processes in distributed systems synchronize. Synchronization is all about doing the right thing at the right time. A problem in distributed systems, and computer networks in general, ... used to handling replication, let alone understanding what it means to provide detailed information on consistency. Therefore, it is mandatory that there are simple and easy-to-un...

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... 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 ... mentioned protocols, are common to many distributed systems, and are discussed extensively in this chapter. The main difficulty in designing secure distributed systems is...

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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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... 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 systems, the ... stable solutions can be identified. 12 .7 FAULT TOLERANCE Fault tolerance in the Web-based distributed systems is mainly achieved through client-side caching and server replication. No special m...

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