A three-phase commit protocol has the following parts: Phase 1: Is the same as for two-phase…

A three-phase commit protocol has the following parts: Phase 1: Is the same as for two-phase commit. Phase 2: The coordinator collects the votes and makes a decision. If it is No, it aborts and informs participants that voted Yes; if the decision is Yes, it sends a preCommit request to all the participants. Participants that voted Yes wait for a preCommit or doAbort request. They acknowledge preCommit requests and carry out doAbort requests. Phase 3: The coordinator collects the acknowledgements. When all are received, it commits and sends doCommit requests to the participants. Participants wait for a doCommit request. When it arrives, they commit. Explain how this protocol avoids delay to participants during their ‘uncertain’ period due to the failure of the coordinator or other participants. Assume that communication does not fail.

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