The inherent cost of nonblocking commitment

  • Authors:
  • Cynthia Dwork;Dale Skeen

  • Affiliations:
  • -;-

  • Venue:
  • PODC '83 Proceedings of the second annual ACM symposium on Principles of distributed computing
  • Year:
  • 1983

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Abstract

A commitment protocol orchestrates the execution of a distributed transaction, allowing each participant to “vote” on the transaction and then applying a pre-specified rule to decide the outcome (commit or abort). A nonblocking commitment protocol is able to correctly terminate a transaction at all operational participants in the presence of any number of benign processor failures. Herein, we derive strong lower bounds for both nonblocking protocols and their less fault-tolerant blocking counterparts. Results on message complexity are both surprising and encouraging: the message complexities of the two classes of protocols are identical. Results on time complexity were less encouraging: nonblocking protocols are approximately 50% more expensive. However, we show how to overlap nonblocking executions of interfering transactions and thereby reduce their extra cost.