Three-phase commit protocol: Difference between revisions

Revision as of 15:20, 14 December 2010

Revision as of 13:41, 18 July 2011

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The Three-phase commit protocol eliminates this problem by introducing the '''Prepared to commit'''

state. If the '''coordinator''' fails before sending '''preCommit''' messages, the '''cohort''' will

unanimously agree that the operation was '''abortaborted'''ed. The '''coordinator''' will not send out a '''doCommit'''

message until '''all''' cohort members have '''ACK'''ed that they are '''Prepared to commit'''.

This eliminates the possibility that '''any''' cohort member actually completed the