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1. Lamport's Scheme. How do user and server synchronize on which password to use? h: one-way hash function (e.g., MD5 or SHA-1) hn(k): h(h(h(...h(k)...))) Registration ...
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Timestamp Algorithms:(Lamport's algo. modified) Idea: ... Timestamp Algorithms:(Lamport'algo. CS_Monitor() cont.) on the receipt of Request from p ...
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Title: Lamport's Scalar Clocks and Singhal & Kshemkalyani's Vector Clocks Author: ABED Last modified by: ABED Created Date: 11/30/2006 9:07:25 AM
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a symmetrical, distributed algorithm cannot use fewer ... similar to Lamport's Bakery Algorithm. range never more than (N-1) can solve using modulo 2N ...
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Lamport's logical timestamps preserve causality: ... A send (message) event carries its timestamp ... Lamport Timestamps. Logical Time ...
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while loop example from last time. Going from randVal = 9 to randVal = 0 may take ... Lamport's paper added to readings. Project 4 stripped down from last year ...
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Logical time Vs. absolute time (from UTC) ... Lamport's algorithm corrects the clocks. Lamport's algorithm can only achieve partial ordering ...
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Title: PowerPoint Presentation Author: Francis Quek Last modified by: Dennis Kafura Created Date: 1/5/2005 10:58:01 PM Document presentation format
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Woudn't this be a nice property for a distributed computer system? 3 ... and define (Ti,i) (Tj,j) if and only if Ti Tj or Ti = Tj and i j. Fig. 11.6 ...
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Distributed System Design: An Overview* Jie Wu Department of Computer Science and Engineering Florida Atlantic University Boca Raton, FL 33431 U.S.A.
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Ordering and Consistent Cuts Presented By Biswanath Panda Introduction Ordering and global state detection in a distributed system Fundamental Questions What is ...
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A set of local states that are concurrent with each other ... Group of photographers taking snaps of different portions and trying to combine ...
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Current technology utilizes standard Ethernet connectivity and ... with: Yaron Weinsberg (HUJI), Tal Anker (Marvell), Muli Ben-Yehuda (IBM), Pete Wyckoff (OSC) ...
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Synchronization Chapter 5 Synchronization Multiple processes must not simultaneously access shared resource Ordering may be important Such as, msg 1 must come before ...
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... sensor nets of millions of ... fault tolerant deadlock-free. Scheduling static and dynamic load ... in Ad Hoc Wireless Networks The dynamic nature of ad hoc ...
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How to keep other clocks in sync? Let t be UTC time. Let ... Server tells others how to adjust their clock. Chapter 5 Synchronization 21. Averaging Algorithms ...
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The election of a new controller helps to alleviate some of the problems arising ... In leader election starvation is not an issue. ...
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Leap seconds are introduced when necessary to keep in phase with the sun. ... The time daemon tells everyone how to adjust their clock. Lamport Timestamps ...
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Clock Synchronization in Centralized Systems. a ... consider using the local clock of each machine ... need to synchronize clocks with real-world clocks ...
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... and a nominal 'perfect clock' per unit of time measured by the reference ... Astronomical Time: ... rarely deleted, to keep in step with Astronomical Time ...
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It is based on atomic time, but occasionally adjusted to astronomical time ... Clock drift rate: the difference per unit of time from some ideal reference clock ...
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Process 4 holds an election. Process 5 and 6 respond, telling 4 to stop ... Others don't see intermediate results, either. Consistent. System invariants not violated ...
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this information is determined by same distributed algo. ( CountMoney) ... ALGO:- Each process Ai simply receives invocations from user Ui and broadcasts them. ...
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... and a nominal 'perfect clock' per unit of time measured by the reference ... Astronomical Time: ... rarely deleted, to keep in step with Astronomical Time ...
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Synchronization Clock Synchronization and algorithm
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Title: A Novel Approach of Prioritizing Use Case Scenarios (Uma nova abordagem para prioriza o de cen rios de caso de uso) Author: uriank Last modified by
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Cryptography and Network Security Chapter 11 Fifth Edition by William Stallings Lecture s by Lawrie Brown * The structure of each of the 80 rounds is shown in ...
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Midterm Review CS 237 Distributed Systems Middleware (http://www.ics.uci.edu/~cs237) Nalini Venkatasubramanian nalini@ics.uci.edu
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On Beyond Registers: Wait-Free Readable Objects Maurice Herlihy Brown University
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Advanced Operating Systems Lecture 7: Concurrency University of Tehran Dept. of EE and Computer Engineering By: Dr. Nasser Yazdani Univ. of Tehran
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Replicas must execute operations in the same order ... Primary is the replica with id. i = v# mod N. A log of op, op#, status entries ...
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Lecture 14 Synchronization (cont)
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Turing Award Kun-Mao Chao ( ) Department of Computer Science and Information Engineering National Taiwan University, Taiwan A note given in BCC class on May ...
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Example (Needham-Schroeder) Properties. Evaluation. Security Protocol Specification Languages ... Needham-Schroeder Protocol. Devised in '78. Example of weak ...
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Consistency and Replication Distributed Software Systems
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Turing Award Kun-Mao Chao ( ) Department of Computer Science and Information Engineering National Taiwan University, Taiwan A note given in BCC class on April ...
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Title: PowerPoint Presentation Last modified by: Ken Birman Created Date: 1/1/1601 12:00:00 AM Document presentation format: On-screen Show Other titles
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Advanced Security Constructions and Key Management Class 16 Outline One-Time Signatures Lamport s signature Improved signature constructions Merkle-Winternitz ...
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15-440 Distributed Systems Lecture 9 Time Synchronization *
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Possessor of the token has access to critical section. Need to take care of conditions ... Si's request is the top most one in request_queuei. Releasing CS: ...
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Whenever two girls talk they exchange all gossips they know. ... Case study of Esprit-LTR. project 26270 VHS. Physical plant of SIDMAR. located in Gent, Belgium ...
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Title: Chap 6: Synchronizaton Author: zhuy Last modified by: zhuy Created Date: 8/16/2006 12:00:00 AM Document presentation format: On-screen Show (4:3)
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Distributed Computing Concepts - Global Time and State in Distributed Systems Prof. Nalini Venkatasubramanian Distributed Systems Middleware - Lecture 2 ...
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... of algorithms that gather global state in a distributed system Depending ... Global State Detection using the Chandy-Lamport Algorithm An Optimization ...
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Last Class: Naming Name distribution: use hierarchies DNS X.500 and LDAP
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SHARCnet ... Logical Clocks
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Distributed Hash Tables David Tam Patrick Pang Presentation Outline What is DHT (Distributed Hash Table)? Why DHTs? Applications How lookup works?
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Az el ad s tartalma AAA TLS NTLM SSO Kerberos * H l zati Oper ci s ... (Leslie Lamport: hash l nc ... Jelszav b l, MD5 t rol s, l trehoz skor ...
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Paxos Commit Jim Gray Leslie Lamport Microsoft Research Preview of a paper in preparation Presented Microsoft Research Techfest 3 March 2004, Redmond, WA
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Lamport timestamps for the events shown in Figure 10.5. Dr. Jenhui ... Vector timestamps and variable values for the execution of Figure 10.9. Dr. Jenhui Chen ...
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Title: CS514: Intermediate Course in Operating Systems Author: Kenneth P. Birman Last modified by: jinghe Created Date: 8/22/2000 6:19:51 PM Document presentation format
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Distributed Mutual Exclusion The basic requirements for mutual exclusion concerning some resource At most one process may execute in the critical section at one time ...
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Lecture 13 Synchronization (cont)
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The Byzantine Generals Problem. Leslie Lamport, Robert Shostak and ... loyal lieutenant obeys the order he sends. Impossibility Results. Valid for oral messages ...
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distributed program executed by a collection of processes ... each sent message m contains timestamp TS(m) update rules by pi at occurrence of ei: ...
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(Transaction#, Pre-state, Post-state) (Trans#, DataItem, OldValue, NewValue) Transaction ... For read(T,x), ts(T) tsWR(x), then abort T ...
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