Distributed system - Class 2(Distributed System Design)

On strict separation

Observation

Finding a balance

Hard coding policies ofen simplifies management and reduces complexity at the price of less flexbility. There is no observe solution

User -> load; H/M resources

• Scale up
  • If you want add more resource but not enough memory so that add more machines(servers)
• Scale out
  • Distance is too long so as to add more servers to work togerther

Technology application

• hiding communication latency
• distribut work replication (and caching)

Practical problme

If one server takes heavy requests and we add another server, how to assign new commming request to make requests balance? Check load bound of servers in each second and send request to right server.

Reference material:
Book: Distributed Systems, Third edition, Version 3.02(2018), Maarten van Steen and Andrew S. Tanenbaum.
Lectures: University of Waterloo, CS 454/654 (Distributed System), 2020 winter term, Professor Khuzaima Daudjee.