Thursday, September 13, 2007

Distributed System Design - Google

I just read an article I found from reddit - programming and it's about distributed system design from Google code. Below is a part of the article I found quite true for all the distributed system.

"To be truly reliable, a distributed system must have the following characteristics:

  • Fault-Tolerant: It can recover from component failures without performing incorrect actions.
  • Highly Available: It can restore operations, permitting it to resume providing services even when some components have failed.
  • Recoverable: Failed components can restart themselves and rejoin the system, after the cause of failure has been repaired.
  • Consistent: The system can coordinate actions by multiple components often in the presence of concurrency and failure. This underlies the ability of a distributed system to act like a non-distributed system.
  • Scalable: It can operate correctly even as some aspect of the system is scaled to a larger size. For example, we might increase the size of the network on which the system is running. This increases the frequency of network outages and could degrade a "non-scalable" system. Similarly, we might increase the number of users or servers, or overall load on the system. In a scalable system, this should not have a significant effect.
  • Predictable Performance: The ability to provide desired responsiveness in a timely manner.
  • Secure: The system authenticates access to data and services [1]"
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