Ring-based Election Algorithm Assignment Help

  • Processes have unique Ids as well as organized in a logical ring
  • Each process understands its neighbors
    • Select process along with highest ID
  • Begin election if just simply retrieved or even coordinator has failed
  • Send Election in order to nearest downstream node that's alive
    • Sequentially poll every successor until a live node is available
  • Each process tags it's ID about the information
  • Initiator recommendations node along with highest ID as well as sends a coordinator message
  • Multiple elections could be in progress
    • Wastes network bandwidth however does no harm

A Ring Algorithm Example:

Ring Algorithm Example

Comparison Bully algorithm and Ring algorithm:

  • Assume n processes and one election in progress
  • Bully algorithm
    • Worst case: initiator will be node together with least expensive ID
      • Triggers n-2 elections with higher ranked nodes: O( n2 ) msgs
    • Best case: immediate election: n-2 messages
  • Ring algorithm
    • 2 ( n-1 ) messages always
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