Lamport clock

Note: This one IP is worth 200 points. Parts 1 and 2 together are worth 100 points. Part 3, which is “summative” is worth 100 points. Part 1: In a two-phase, total-order multicast system, messages are sent in the following sequence from node S to G1 and G2. G1 and G2 are the members of the group. 1. S sends m1 to G1 2. S sends m1 to G2 3. S sends m2 to G2 4. S sends m2 to G1 Use the basic implementation of the Lamport clock. The clock s at each node start at: S: 4, G1: 6, G2: 1 Show the exchange of messages and their acknowledgments in a clock diagram using the basic implementation of Lamport’s clock. In which order and at what times are m1 and m2 delivered? Part 2. Draw a state diagram of Maekawa’s voting algorithm on the slide “Maekawa’s algorithm” in the “Distributed mutual exclusion” slide set. Note that the state diagram is from the point of view of any one of the nodes, called “this” node below. The state diagram cannot show the states of other nodes. i) Start with the basic case where “this” node wants the lock, gets it, and then releases it, and no other node wants the lock at the same time. In this case, “this” node goes through all the states in this order: Released and not voted Wanted and not voted Wanted and voted Held and voted Released and voted (Back to) Released and not voted Events are: acquire for when “this” node wants the lock release for when “this” node gives up the lock. 8/7/20 3:01 PM 15 request_received, reply_received, and release_received when a message from any node arrives at “this” node. The state diagram is similar the one of Ricart and Agrawala’s state machine (in the Distributed Mutual Exclusion PowerPoint deck) but has more states. *** If you do part i) more or less correctly, you will earn most of the points. *** ii) The complete solution includes the situations where “this” node votes on requests from other nodes. The states are the same as above, but there are additional transitions and actions. Use the “Maekawa scenario” slide in the Distributed Mutual Exclusion slide set, or Fig. D-10 in the Study Guide. Warning: There is an incorrect solution for this problem on the Web. It has extra, incorrect states. Part 3 (100 points): Summarize the course in your own words in an essay of 5-6 pages or so. Feel free to reuse any relevant DB posts as well as Unit 3 IP, but please correct any errors found. Edit it all into one paper that reads nicely from top to bottom and is styled according to APA. Include at a minimum: • How threads and safe objects interact. This can be in general or based on Ada or Java. • Entity-life modeling: the idea of finding event-sequence models of the domain and map them onto thread architectures in the software. Deadlock prevention. • The use of logical clocks for communication and/or for distributed mutual exclusion.  

Business Continuity and the Cloud

 

Assignment Content

  1. The CEO of your company is concerned that a natural disaster could make your company’s information systems unavailable long enough to significantly impact business. Currently, critical systems like file servers, e-mail services, and applications – like HR, payroll, billing, and Customer Relationship Management (CRM) – are hosted in a local data center.
    Your job is to educate the board on the benefits and risks associated with using cloud services for business continuity and disaster recovery in order to aid their decision on whether to move to a cloud-based service or continue working from a local data center.

    Prepare a 4- to 5-page Microsoft Word document discussing the use of cloud services for business continuity and disaster recovery. 

    Include the following:

    Cloud Services for Business Continuity and Disaster Recovery:

    • Define business continuity and disaster recovery in the context of the cloud services.
    • Show the importance of disaster continuity and disaster recovery to the function of the business.
    • Risk Assessment:
    • Identify which risks can be transferred to the cloud provider based on the functions of the business.
    • Explain new risks associated with using cloud services based on the functions of the business.
    • Cost/Benefit Analysis:
    • Show the costs associated with a cloud-based solution for the business.
    • Outline the benefits associated with a cloud-based solution for the business.
    • Conclusion:
      Relate the risk assessment and cost/benefit analysis to the business continuity and disaster recovery for the needs the business.

week research paper

 

This week’s journal article was focused on the Complexity of Information Systems Research in the Digital World.  Complexity is increasing as new technologies are emerging every day.  This complexity impacts human experiences.  Organizations are turning to digitally enabled solutions to assist with the emergence of digitalization. 

Please review the article and define the various technologies that are emerging as noted in the article.  Note how these emerging technologies are impacting organizations and what organizations can to do to reduce the burden of digitalization.

Be sure to use the UC Library for scholarly research. Google Scholar is also a great source for research.  Please be sure that journal articles are peer-reviewed and are published within the last five years.

The paper should meet the following requirements:

  • 3-5 pages in length (not including title page or references)
  • APA guidelines must be followed.  The paper must include a cover page, an introduction, a body with fully developed content, and a conclusion.
  • A minimum of five peer-reviewed journal articles.

 

Chapter 1 Journal articles