PPT-Consensus and Paxos COS 418:

Author : trish-goza | Published Date : 2019-03-01

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

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Consensus and Paxos COS 418:: Transcript

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. Theabovecalculationalsoallowsustoobtain~J2,~J2=J2z+1 2(J+J+JJ+)=(jhcos)2+1 2q jh(1+cos)(jh(1cos)+h)q jh(1+cos)q jh(1cos)(jh(1+cos)+h)q jh(1cos)=j(j+1)h2:(25)3.3WaveFunctionsWe A Consensus Algorithm for . Fault Tolerant Replication. CS 5204 – Fall, 2008. System Model. Messages. possible indefinite delay. possible duplication or loss. delivered messages not corrupted. . . .. WorksupportedbytheNationalScienceFoundationwhichof3formsatermcantake.Therstformis )sinh()cos( )sinh()sin(.(2)Thesecondformis kysinh(k )sinh()sin( )sin()cos()cos()cos( )sin()sin( M(i)sin1002+sin(i) N(i)cos(i)sin1002A12=NPi=1sin2(i)sin(i)cos(i) (M(i)sin100)2sin(i)cos(i) (N(i)cos(i)sin100)2A13=NPi=1sin(i)cos(i)cos(i) (M(i)sin100)2A22=NPi=1sin(i)sin(i) M( 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. 2(+)cos1 2()cos+cos=2cos1 2(+)cos1 2()coscos=2sin1 2(+)sin1 2()InatriangleABC,a=sinA=b=sinB=c=sinCanda2=b2+c22bccosAPrexesT=tera=1012c=centi=102G=giga=109m=milli=103M=mega=106 Paxos. --- 1. Steve Ko. Computer Sciences and Engineering. University at Buffalo. Recap. NFS. Caching with write-through policy at close(). Stateless server. One power efficient design: FAWN. Embedded CPUs & Flash . James C. Corbett et al . OSDI 2012. Presenter: Akshay Ravichandran. Outline. What is Spanner?. Why Spanner?. Implementation. External Consistency. Concurrency Control. Evaluation. Related Work. Future Work. 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 ?. 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):. Lecture 19. Haonan. Lu. Slides adapted from Wyatt Lloyd and Mike Freedman’s, which are adapted from the Spanner OSDI talk. Efficient read-only transactions in strictly serializable systems. Strict serializability is desirable but costly!. 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?.

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