PPT-Paxos and Replicated State Machine (RSM)

Paxos and Replicated State Machine RSM Outline Basic Concepts of Replicated State Machine Paxos Made Simple Replicated State Machine We can replicate data how can we guarantee it is correctly replicated. Cheap Paxos a variant of the Paxos al gorithm guarantees liveness under the additional as sumption that the set of nonfaulty processors does not jump around too fast but uses only F 1 main pro cessors that actually execute the system and F auxiliar Ali Ghodsi. alig@cs.berkeley.edu. Replicated State Machine (RSM). Distributed Systems 101. Fault-tolerance. . (partial, byzantine, recovery,...). Concurrency. (ordering, asynchrony, timing,...). Generic. Advanced Topics in Computer Systems. Lecture 24. Paxos/Megastore. November . 26. th. , . 2012. John . Kubiatowicz. and Anthony D. Joseph. Electrical Engineering and Computer Sciences. University of California, Berkeley. b. y. P.E. . . Chigbu. . and N.C. . . Orisakwe. Department of Statistics. University of Nigeria, . Nsukka. . DEPARTMENT OF STATISTICS. UNIVERSITY OF NIGERIA. NSUKKA. ABSTRACT. . Experimental designs are often replicated to obtain accurate estimates of the effects of the input variables on the response variables. Thus when partial replication of experimental units occur, there is need for . . Finite State Machine. Mathematical.  abstraction of computation that has been used to design . algorithms . and teach programming. .. Finite: . limited number. State: . how something is in that . In class exercise. Design a 2-bit up-down counter with a control signal U. If U=0, count down, else count up.. Combinational and Sequential Circuit. Digital logic systems can be classified as combinational or sequential. . & . lock_detector. sign. -off and design flow. A. Kluge. 2013 01 31, . 2013. DLL & state machine. A. Kluge. 2. release mux. A. Kluge. 3. reset. A. Kluge. 4. DLL state machine. P. revents . Burcu Canakci & Matt Burke. . Outline. Consensus. The Part-Time Parliament. Single-Decree Paxos. Liveness. Multi-Decree Paxos. Paxos Variants. Conclusion. Outline. Consensus. The Part-Time Parliament. Distributed Systems. Lecture 12. Michael Freedman. Let different replicas assume role of primary over time. System moves through a sequence of views. How do the nodes agree on view / primary?. 2. Recall the use of Views. . Distributed. . Systems. Crash. . Fault. . Tolerance. Sisi. . Duan. Assistant. . Professor. Information. . Systems. sduan@umbc.edu. Outline. A. . brief. . history. . of. . consensus. Paxos. Paxos Made Simple One-shot Paxos: solving consensus Multipaxos: Efficient state machine replication One-shot Paxos: solving consensus Multipaxos: Efficient state machine replication Consensus Get N nodes to agree on a value View Change Protocols and Consensus COS 418: Distributed Systems Lecture 11 Mike Freedman Today View changes in primary-backup replication Consensus 2 Review: Primary-Backup Replication Nominate one replica . Oct 22, 2018. What is consensus?. A group of people go to the same place for the same meal.. → A set of nodes have the same value for the same variable.. X=. 7. X=7. X=7. Why is it important?. In state machine replication (SMR):. Each 42the OI 2DSeuTli and zPage wIIPwC hwaccuracy Page wcash Seive trading Page won iiaiiOtiS urior Oii7i bligaiioris 1Page wPaxos Page wIn MIX32 bSPage wiv ZZ Page wParticipant vJii reyuird O c27gQ