Description

Three-Phase Commit (3PC) is an atomic commitment protocol for distributed systems. It is an extension of the two-phase commit protocol that avoids the blocking problem of 2PC by adding a pre-commit phase and using time-outs.

Where to use

• Distributed systems requiring higher availability than 2PC.
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• Databases prone to coordinator failure.

Real World Example

A distributed database system where the coordinator might crash. 3PC ensures participants don't get stuck indefinitely holding locks.

Code Example

# Code Concept for Three-Phase Commit
# This pattern is architectural.

class Service:
    def execute(self):
        # Implementation logic
        pass