Phase 1: Prepare
Coordinator sends PREPARE. Each participant votes YES (locked resources, ready) or NO. Response persisted before reply.
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Phase 1: Prepare
Coordinator sends PREPARE. Each participant votes YES (locked resources, ready) or NO. Response persisted before reply.
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Phase 2: Commit or Abort
All YES → coordinator sends COMMIT. Any NO → sends ABORT. Participants apply + release locks.