PPT-Chubby: A Consensus Service

Jeff Chase Duke University http wwwcsdukeedu chase cps512 Chubby the big picture Shared consensus service eg Chubby Your scalable application service p axos inside What are the right abstractions for this API. Abstract We describe our experiences with the Chubby lock ser vice which is intended to provide coarsegrained lock ing as well as reliable though lowvolume storage for a looselycoupled distributed system Chubby provides an interface much like a dist Lock server for . distributed . applications. 1. Dennis Kafura – CS5204 – Operating Systems. Overview. Purpose. Client synchronization . course-grain locking. leader election. Environment information. 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. Ken Birman. Fall 2012. Consensus… a classic problem. Consensus abstraction underlies many distributed systems and protocols. N processes. They start execution with inputs.  {0,1}. Asynchronous, reliable network. to increasing support for climate action. John Cook. Global Change Institute, University of Queensland. 19 Sep 2013. “Science . is not a democracy. . It . is a dictatorship. . It . is evidence that does the dictating. A Tool for Teams. Sister Singers Festival. July 25, 2014. Presenter: Mindy Taylor. Session Overview. Become familiar with a group process tool called Consensus Validation. Learn the steps in doing Consensus Validation. A Tool for Teams. GALA Leadership Symposium. October 11, 2013. Presenter: Mindy Taylor. Session Overview. Become familiar with a group process tool called Consensus Validation. Learn the steps in doing Consensus Validation. When you can’t agree to disagree. Consensus. Why do applications need consensus?. What does it mean to have consensus?. Consensus = consistency. Assumptions. Processes can choose values. Run at arbitrary speeds. Terri Giordano MSN, CRNP, CORLN. Division of Otolaryngology. The Children’s Hospital of Philadelphia. Tracheosto. my Care. Systematically developed statements to assist practitioner and patient decisions about appropriate health care for specific clinical circumstances. WSLD 2012. What is CBDM?. CBDM stands for Consensus-Based-Decision-Making. Consensus . may be defined . as . an acceptable resolution, one that can be supported, even if not the "favorite" of each individual. . 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?. Byzantine Generals Problem. Solution with signed message. . A . signed message. satisfies all the conditions of oral message, plus . two extra conditions. Signature cannot be forged. Forged message are detected and discarded by loyal generals.. for Replicated Logs. Diego Ongaro and John Ousterhout. Stanford University. Replicated log => . replicated state . machine. All servers execute same commands in same . order. Consensus module ensures proper log replication. on Exercise / Physical Activity for Individuals with Type 2 Diabetes. Purpose of the Update. This statement is an update of the 2010 position stand on exercise & type 2 diabetes (T2D) published jointly by the American College of Sports Medicine (ACSM) and the American Diabetes Association (ADA)..