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. -. RSM. : Low-Latency Inter-Datacenter . State . Machine Replication. Using . Loosely Synchronized . Physical . Clocks. Jiaqing. Du, Daniele . Sciascia. , . Sameh. . Elnikety. Willy . Zwaenepoel. , Fernando . Made Simple. Gene Pang. Paxos. L. . Lamport. , The Part-Time Parliament, September 1989. Aegean island of . Paxos. A part-time parliament. Goal: determine the sequence of decrees passed. Lamport. related their protocol to fault-tolerant distributed systems. 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 . Replication. Lecture 16. , Oct 22. nd. 2015 . How’d we get here?. Failures & single systems; fault tolerance techniques added redundancy (ECC memory, RAID, etc.). Conceptually, ECC & RAID both put a “master” in front of the redundancy to mask it from clients -- ECC handled by memory controller, RAID looks like a very reliable hard drive behind a (special) controller. Cezara. . Drăgoi. , INRIA ENS CNRS. Thomas A. . Henzinger. , IST Austria. Damien Zufferey. , MIT CSAIL. SNAPL, 2015.05.04. Fault-tolerant distributed algorithms. How to get it right when things go wrong ?. 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. Crash. . Fault. . Tolerance. Sisi. . Duan. Assistant. . Professor. Information. . Systems. sduan@umbc.edu. Outline. A. . brief. . history. . of. . consensus. Paxos. Lecture 11, . Oct 6. th. . 2016 . How’d we get here?. Failures & single systems; fault tolerance techniques added redundancy (ECC memory, RAID, etc.). Conceptually, ECC & RAID both put a “master” in front of the redundancy to mask it from clients -- ECC handled by memory controller, RAID looks like a very reliable hard drive behind a (special) controller. 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 Consensus I FLP Impossibility, Paxos COS 418: Distributed Systems Lecture 7 Michael Freedman 2 Recall our 2PC commit problem C  TC: “go!” TC  A, B: “prepare!” A, B  P: “yes” . 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):. Hull Parts - Bow Area 1234 10111314121287895 151617201918 1RS Feva Foredeck FEVHF-1002Poz pan screw 12 x 1 1/2 FIX-S12-P013Washer M6 'A' FIX-W6-0014100mm Back Dacron Path ZDP10015Allen Hath 4 Inch: Se Paxos. COS 418: Distributed Systems. Lecture . 10. Wyatt Lloyd. Let different replicas assume role of primary over time. System moves through a sequence of views. How do the nodes agree on view / primary?.