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 ... written in Java and a server in C, or vice versa. A client and server can run on different hardware plat-forms and use different operating systems. A yariety of network protocols and data representations ... Berkeley sockets and MPI is that message-queuing systems are typi-cally targeted to support message transfers that are allowed to take minutes in-stead of seconds or milliseconds. We first...

DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 6 pptx

... of FIFO and totally-ordered multicast,processes P2 and P 3 in Fig. 8-15 may both first deliver messagem-; and then mes-sage mI.' However, if P2delivers ml before m3, while P 3 delivers ... mentioned protocols, are common to many distributed systems, and are discussed extensively in this chapter. The main difficulty in designingsecure distributed systems is not so much caused by security ... concerning 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...

DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 1 pot

... SYSTEMS 171 .3. 1 Distributed Computing Systems 171 .3. 2 Distributed Information Systems 201 .3. 3 Distributed Pervasive Systems 241.4 SUMMARY 30 2ARCHITECTURES 33 2.1 ARCHITECTURAL STYLES 34 2.2 SYSTEM ... by Redundancy 32 68.2 PROCESS RESILIENCE 32 88.2.1 Design Issues 32 88.2.2 Failure Masking and Replication 33 08.2 .3 Agreement in Faulty Systems 33 18.204Failure Detection 33 58 .3 RELIABLE CLIENT-SERVER ... COMMUNICATION 33 68 .3. 1 Point-to-Point Communication 33 78 .3. 2 RPC Semantics in the Presence of Failures 33 7804RELIABLE GROUP COMMUNICATION 34 3804.1Basic Reliable-Multicasting Schemes 34 3804.2Scalability...

DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 2 pps

... one for handling interaction with the user and SEC. 2.2SYSTEM ARCHITECTURES 53 Collaborative Distributed Systems Hybrid structures are notably deployed in collaborative distributed systems. The ... requests, and hands off such connec-tions to one of the servers (Hunt et al, 1997; and Pai et al., 1998). The principleworking of what is commonly known as TCP handoff is shown in Fig. 3- 13. When ... 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...

DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 4 ppt

... prefix 2n 30 : a node whose identifier has prefix 30 n 31 :a node whose identifier has prefix 31 n 33 :a node whose identifier has prefix 33 n 32 0: a node whose identifier has prefix320n 32 2: a ... defined the second to be the time ittakes the cesium 133 atom to make exactly 9,192, 631 ,770 transitions. The choiceof 9,192, 631 ,770 was made to make the atomic second equal to the mean solar second ... 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...

DISTRIBUTED SYSTEMS principles and paradigms Second Edition phần 5 pot

... m=8 and k= 3. When looking up the node responsible for a specific keyp,we can first decide toroute the lookup request to the node responsible for the patternp AND 11100000 31 4CONSISTENCY AND ... 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...

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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. 10Object orientation began to be used for developing distributed systems in the1980s. ... 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 ... incoming and outgoingtraffic, either by discarding certain requests and pages, or modifying pages whenthey contain executable code.9 .3. 3 Secure Mobile CodeAs we discussed in Chap. 3, an important...

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 Fig. 11- 13. 502 DISTRIBUTED FILE SYSTEMS CHAP. 1111 .3 COMMUNICATIONAs with processes, there is nothing particularly special or unusual about com-munication in distributed file systems. Many...

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 ... associated with the handed-off TCP connec-tion.Figure 12-9. A scalable content-aware cluster of Web servers.596 DISTRIBUTED COORDINATION-BASED SYSTEMS CHAP. 13 Figure 13- 4. The principle of ... document is changed. a DISTRIBUTED WEB-BASED SYSTEMS CHAP. 12564 DISTRIBUTED WEB-BASED SYSTEMS CHAP. 12Figure 12-12. (a) HTTP request message. (b) HTTP response message.Fig. 12- 13 shows a number...

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