Recovery approach to the design of stabilizing communication protocols

  • Authors:
  • Kassem Saleh;Imtiaz Ahmad;Khaled Al-Saqabi;Anjali Agarwal

  • Affiliations:
  • Department of Electrical and Computer Engineering, Kuwait University, PO Box 5969, 13060 Safat, Kuwait;Department of Electrical and Computer Engineering, Kuwait University, PO Box 5969, 13060 Safat, Kuwait;Department of Electrical and Computer Engineering, Kuwait University, PO Box 5969, 13060 Safat, Kuwait;Department of Electrical and Computer Engineering, Concordia University, Canada

  • Venue:
  • Computer Communications
  • Year:
  • 1995

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Abstract

This paper addresses the problem of designing stabilizing computer communication protocols modelled by communicating finite state machines. A communication protocol is said to be stabilizing if, starting from or reaching any illegal state, the protocol will eventually reach a legal (or consistent) state, and resume its normal execution. To achieve stabilization, the protocol must be able to detect the error as soon as it occurs, and then it must recover from that error and revert back to a legal protocol state. The later issue related to recovery is tackled here, and an efficient procedure for the recovery in communications protocols is described. The recovery procedure does not require periodic checkpointing and, therefore, is less intrusive. It requires less time for rollback and fewer recovery control messages than other procedures. Only a minimal number of processes will roll back, and a minimal number of protocol messages will be retransmitted during recovery. Moreover, our procedure requires minimal stable storage to be used to record contextual information exchanged during the progress of the protocol. Finally, our procedure is compared with an existing recovery procedure, and an illustrative example is provided.