Concurrent Reading and Writing using Mobile Agents



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The Case of Facebook

  • 17
  • 30,000 servers
  • The new Facebook data center in Prineville, Oregon. The new servers have been redesigned are networked, for energy efficiency, speed-up and for fault-tolerance.
  • The set up mimics client-server kind of operation, with the servers having a high level of parallelism. However, the network of servers may also be viewed as a distributed system.
  • user
  • user
  • user

Objective of the course

  • We will not discuss programming issues here, although you can choose a project and work on it at your own initiative. We will discuss about it soon.
  • 18
  • With some knowledge in networking, it is not difficult to put
  • together a distributed system. It is however, much more difficult
  • guarantee that it behaves the way we want it to behave.
  • Remember that a system that “sometimes work” is no good. We
  • will study what are the critical issues, why a system fails, and how
  • We can guarantee our design.

Understanding Models and abstractions

How models help

  • algorithms
  • models
  • Real hardware
  • Implementation of models

Message passing vs. shared memory

Modeling Communication

  • System topology is a graph G = (V, E), where V = set of nodes (sequential processes) E = set of edges (links or channels, bi/unidirectional).
  • Four types of actions by a process:
  • - internal action
  • - input action
  • - communication action
  • - output action

Example: A Message Passing Model

  • A Reliable FIFO Channel
  • Axiom 1. Message m sent ⇔ message m received
  • Axiom 2. Message propagation delay is arbitrary but finite.
  • Axiom 3. m1 sent before m2m1 received before m2.
  • P
  • Q

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