DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 8 docx
DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 8 docx
... If this11 DISTRIBUTED FILE SYSTEMS Considering that sharing data is fundamental to distributed systems, it is notsurprising 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 ARCHITECTUREWe start our discussion on distributed file systems ... in the text. 488 DISTRffiUTED OBJECT-BASED SYSTEMS CHAP. 10Entry consistency is an obvious consistency model for distributed objects and is (often implicitly) supported in many systems. It is...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 9 docx
... 566 DISTRIBUTED WEB;.BASED SYSTEMS CHAP. 1212.3.2 Simple Object Access ProtocolWhere HTTP is the standard communication protocol for traditional Web-based distributed systems, the ... subscribers keep track of themessages they have already received and simply discard duplicates. Alternative, 580 DISTRIBUTED WEB-BASED SYSTEMS CHAP. 12performance, although the methods to reach such ... whichthe goods that a client requires are selected, a second one that handles the pay-ment of those goods, and a third one that takes care of shipping and subsequenttracking of goods. In order to set...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 1 pot
... publish/subscribe systems form an important and expandingclass of distributed systems. We will discuss them at length in Chap. 13.1.3.3 Distributed Pervasive Systems The distributed systems we have ... 3 28 8.2.1 Design Issues 3 28 8.2.2 Failure Masking and Replication 330 8. 2.3 Agreement in Faulty Systems 331 8. 204Failure Detection 335 8. 3 RELIABLE CLIENT-SERVER COMMUNICATION 336 8. 3.1 Point-to-Point ... SUMMARY 317 8 FAULT TOLERANCE 8. 1 INTRODUCTION TO FAULT TOLERANCE 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 3 28 8.2.1 Design...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 2 pps
... one for handling interaction with the user and SEC. 2.2SYSTEM ARCHITECTURES53Collaborative Distributed Systems Hybrid structures are notably deployed in collaborative distributed systems. The ... architectures and software architectures. On the one hand, weneed to organize the components of a distributed system such that monitoring and adjustments can be done, while on the other hand we need ... of distributed systems when decisions aretaken about where components are placed, for example. We discuss such systemarchitectural issues next.2.4 SELF -MANAGEMENT IN DISTRIBUTED SYSTEMS Distributed...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 3 pptx
... 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 ... #8 in Fig. 4-27.The size of the receiver's buffer corresponds to 9 seconds of packets to pass to theapplication. Unfortunately, packet #8 took 11 seconds to reach the receiver, at1 28 COMMUN1CATIONCHAP. ... (19 98) and Gropp et al. (l998a)4.3.2 Message-Oriented Persistent CommunicationWe now come to an important class of message-oriented middle ware services,generally known as message-queuing systems, ...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 4 ppt
... large number of days and taking the average before divid-ing by 86 ,400. The resulting quantity was called the mean solar second. With the invention of the atomic clock in 19 48, it became possible ... anything to do with papal decrees and did notaccept the Gregorian calendar for 170 years.Figure 6-3. TAl seconds are of constant length, unlike solar seconds. Leapseconds are introduced when necessary ... sun.BIR solves the problem by introducing leap seconds whenever the dis-crepancy between TAI and solar time grows to 80 0 msec. The use of leap secondsSEC. 6.1 CLOCK SYNCHRONIZATION237GPS...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 5 pot
... the issue of howprocesses in distributed systems synchronize. Synchronization is all about doingthe right thing at the right time. A problem in distributed systems, and computernetworks in general, ... used to handlingreplication, let alone understanding what it means to provide detailed informationon consistency. Therefore, it is mandatory that there are simple and easy-to-under-stand programming ... the case of DHT-based systems, the basic idea is to reserve a fraction of theidentifier space for superpeers. Recall that in DHT-based systems each nodereceives a random and uniformly assigned...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 6 pptx
... many distributed systems, and are discussed extensively in this chapter. The main difficulty in designingsecure distributed systems is not so much caused by security mechanisms, but bySEC. 8. 6RECOVERY369Coordinated ... 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 (1997). 8. 6.2 ... checkpointing, is often morepopular, and will presumably stay so even when systems grow to much largersizes (Elnozahy and Planck, 2004).374FAULT TOLERANCECHAP. 8 not change and which messages are reliably...
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DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 7 pdf
... capability), and then runs the result through a one-way function.444 DISTRIBUTED OBJECT-BASED SYSTEMS CHAP. 10Object orientation began to be used for developing distributed systems in the1 980 s. Again, ... generation of distributed systems. In this section, we will first takea deeper look into the general architecture of object-based distributed systems, after which we can see how specific principles ... usedin the Amoeba operating system (Tanenbaum et al., 1 986 ).Amoeba was one of the first object-based distributed systems. Its model of distributed objects is that of remote objects. In other...
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