Distributed -Two-Phase Commit
About
The Two-Phase Commit is fairly standard for synchronous processing in order to avoid inconsistent state in a distributed environment.
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Phases
1) User wants to Update; 2) Prepare; 3) Write to Log; 4) Ready; 5) Commit
First the User wants to Update, then the update is prepared, written to log, set to a ready state, and finally committed to the database.
Phase 1
Coordinator Sends “Prepare to Commit”
Subordinates make sure they can do so no matter what
Write the action to a log to tolerate failure
Subordinates Reply “Ready to Commit”
Phase 2
If all subordinates ready, send “Commit”
If anyone failed, send “Abort”
Documentation / Reference