three-phase commit (3PC)
Add a pre-commit phase to reduce blocking under restricted failure assumptions.
Use this when You are comparing atomic commit protocols and their failure models.
without the term
“Would an extra stage let participants recover without waiting forever? Explain the network and failure assumptions.”
with the term · How do you ask a model for three-phase commit (3PC)?
Compare 3PC with 2PC for this failure model. Explain pre-commit and where the nonblocking assumptions fail.
What is three-phase commit (3PC)?
Classic 3PC separates voting, pre-commit, and commit so surviving participants can resolve some coordinator failures. Its nonblocking argument relies on timing and failure assumptions; arbitrary network partitions require different treatment.
Why does three-phase commit (3PC) matter when vibe coding?
An agent can recommend an extra message round as a universal cure for 2PC blocking.
How do you do three-phase commit (3PC)?
Compare protocol states and assumptions using the cited recovery model. Analyze coordinator failure and a partition separately before selecting a supported implementation.
What goes wrong with three-phase commit (3PC)?
Classic 3PC does not make arbitrary partitions safe simply by adding timeouts. It is not a substitute for proven consensus-based coordination.
Sources for this entry
- Bernstein, Hadzilacos and Goodman: Distributed Recovery
Section 7.5 derives three-phase commit under failure assumptions and discusses blocking with partitions.
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