Basic HTML version of Foils prepared July 6 99

Foil 172 Two Phase Commit Protocol

From Object Web Computing Technologies CPS714 Computational Science Information Track -- June 16 99. by H. Timucin Ozdemir
OSI TP is defined in December 1992 specifies the two-phase commit protocol with the following steps:
  • Transaction coordinator sends prepare-to-commit message to all subordinate node which might propagate this message also.
  • TM waits until it receives ready-to-commit message from all subordinates.
  • TM sends commit message to all subordinates.
  • TM collects the results and informs the client.
  • If TM receives a refuse message, then transaction aborts and sends rollback message to all subordinates.

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