Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved DISTRIBUTED SYSTEMS Principles and Paradigms Second Edition ANDREW S. TANENBAUM MAARTEN VAN STEEN Chapter 8 Fault Tolerance (Modified – Two-Phase Commit for Distributed Transactions)

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (1) Figure (a) The finite state machine for the coordinator in 2PC. (b) The finite state machine for a participant.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (2) Figure Actions taken by a participant P when residing in state READY and having contacted another participant Q.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (3) Figure Outline of the steps taken by the coordinator in a two-phase commit protocol....

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (4) Figure Outline of the steps taken by the coordinator in a two-phase commit protocol....

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (5) Figure (a) The steps taken by a participant process in 2PC.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Two-Phase Commit (7) Figure (b) The steps for handling incoming decision requests..