Distributed Systems

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EEDC first presentation from group 1

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Distributed Systems

  1. 1. EEDCExecution 34330Environments for Distributed SystemsDistributedComputingMaster in Computer Architecture,Networks and Systems - CANS Homework number: 1 Group number: EEDC-1 Group members: Hugo Pérez – vhpvmx@gmail.com Sergio Mendoza – sergiomendo@gmail.com Carlos Fenoy – carles.fenoy@gmail.com
  2. 2. Definition You know you have a distributed systems when the crash of a computer you have never heard of stops you from getting any work done. - Lamport A collection of independent computers that appears to its users as a single coherent system. - Tanenbaum
  3. 3. Definition A distributed system consists of a collection of autonomous computers, connected through a network and distribution middleware, which enables computers to coordinate their activities and to share the resources of the system, so that users perceive the system as a single, integrated computing facility.
  4. 4. General Architecture
  5. 5. Basic Architectures ● Client-Server ● 3-Tier ● N-Tier ● Distributed Objects ● Tigh Coupling ● Loose Coupling
  6. 6. Characteristics Challenges: ● Heterogeneity ● Transparency ● Fault tolerance and failure management ● Scalability ● Concurrency ● Openness and Extensibility ● Migration and load balancing ● Security
  7. 7. Characteristics Transparency: ● Entire distributed system should appear as a single unit ● Complexity interactions between the components should be typically hidden from the end user. (For the user)
  8. 8. Characteristics Fault tolerance: ● Failure of one or more components should not bring down the entire system
  9. 9. Characteristics Scalability: ● System should work efficiently with increasing number of users ● Addition of a resource should improve the performance of the system. ++ --
  10. 10. Characteristics Concurrency: ● Shared access to resources should be made possible
  11. 11. Characteristics Openness & Extensibility: ● Interfaces should be cleanly separated and publicly available to enable easy extensions to existing components and add new components.
  12. 12. Characteristics Security: ● Access to resources should be secured ● Only known users are allowed to access
  13. 13. Middleware What is middleware?: ● Software layer between the operating system and the applications on each site of the system.
  14. 14. Middleware What Middleware offers?: ● Hiding distribution ● Hiding the heterogeneity ● Providing uniform, standard, high-level interfaces to the application developers and integrators
  15. 15. Middleware How it works? ● Client-side interface invoke functions that the middleware provides
  16. 16. Examples Search Engines
  17. 17. Examples Search Engines ● Google has 36 data centers across the globe. With 150 racks 40 servers per data center, that would mean Google has more than 200,000 servers. This enables a sub-half-second response to an ordinary Google search query that involves 700 to 1,000 servers. CNet News, May 30 2008
  18. 18. Examples Online Games
  19. 19. Examples Online Games ● World of Warcraft ■ 20,000 computer systems ■ 13,250 server blades ■ 75,000 CPU cores ■ 1.3 petabytes of storage ■ 4,600 staffers ● Taikodom (a Brazilian gaming startup) use a combination of a z9 mainframe to handle transactions connected using a Gigabit Ethernet to a cluster of blade servers with Cell processors for graphics.
  20. 20. Examples Social Networks
  21. 21. Examples Twitter (March 14, 2011) #tweets ● 3 years, 2 months and 1 day. The time it took from the first Tweet to the billionth Tweet. ● 1 week. The time it now takes for users to send a billion Tweets. ● 50 million. The average number of Tweets people sent per day, one year ago. ● 140 million. The average number of Tweets people sent per day, in the last month. ● 177 million. Tweets sent on March 11, 2011. ● 456. Tweets per second (TPS) when Michael Jackson died on June 25, 2009 (a record at that time). ● 6,939. Current TPS record, set 4 seconds after midnight in Japan on New Year’s Day.
  22. 22. Examples Grid Computing
  23. 23. Examples EGI (European Grid Infrastructure) Resource Centres 348 Participating countries 58 Installed computing 364,500 cpus capacity Jobs/day 2010-2011 1,331,525
  24. 24. Questions?

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