Three-phase commit protocol: Difference between revisions

Revision as of 12:14, 27 April 2012

Revision as of 09:28, 2 November 2012

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# The cohort receives a '''canCommit?''' message from the coordinator. If the cohort agrees it sends a '''Yes''' message to the coordinator and moves to the prepared state. Otherwise it sends a '''No''' message and aborts. If there is a failure, it moves to the abort state.

# In the prepared state, if the cohort receives an '''abort''' message from the coordinator, fails, or times out waiting for a commit, it aborts. If the cohort receives a '''preCommit''' message, it sends an '''[[acknowledgement (data networks)|ACK]]''' message back and awaits a final '''commit''' or '''abort'''.

# If, after a cohort member receives a '''preCommitdoCommit''' message, the coordinator fails or times out, the cohort member goes forward with the commit.

==Motivation==