Chapter 18 - Distributed Coordination

Chapter 18: Distributed Coordination

Chapter 18 Distributed Coordination ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chapter Objectives ,[object Object],[object Object],[object Object],[object Object]

Event Ordering ,[object Object],[object Object],[object Object],[object Object]

Relative Time for Three Concurrent Processes

Implementation of  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Distributed Mutual Exclusion (DME) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DME: Centralized Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DME: Fully Distributed Approach ,[object Object],[object Object],[object Object],[object Object]

DME: Fully Distributed Approach (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Desirable Behavior of Fully Distributed Approach ,[object Object],[object Object],[object Object],[object Object]

Three Undesirable Consequences ,[object Object],[object Object],[object Object],[object Object],[object Object]

Token-Passing Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Atomicity ,[object Object],[object Object],[object Object],[object Object],[object Object]

Two-Phase Commit Protocol (2PC) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Phase 1: Obtaining a Decision ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Phase 1 (Cont.) ,[object Object],[object Object],[object Object],[object Object]

Phase 2: Recording Decision in the Database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Failure Handling in 2PC – Site Failure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Failure Handling in 2PC – Coordinator C i Failure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concurrency Control ,[object Object],[object Object],[object Object],[object Object]

Locking Protocols ,[object Object],[object Object],[object Object],[object Object]

Single-Coordinator Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Majority Protocol ,[object Object],[object Object],[object Object]

Biased Protocol ,[object Object],[object Object],[object Object]

Primary Copy ,[object Object],[object Object],[object Object],[object Object]

Timestamping ,[object Object],[object Object],[object Object],[object Object],[object Object]

Generation of Unique Timestamps

Deadlock Prevention ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Timestamped Deadlock-Prevention Scheme ,[object Object],[object Object],[object Object],[object Object],[object Object]

Wait-Die Scheme ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Would-Wait Scheme ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock Detection ,[object Object],[object Object],[object Object]

Deadlock Detection – Centralized Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Detection Algorithm Based on Option 3 ,[object Object],[object Object],[object Object]

The Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Local and Global Wait-For Graphs

Fully Distributed Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Augmented Local Wait-For Graphs

Augmented Local Wait-For Graph in Site S2

Election Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object]

Bully Algorithm ,[object Object],[object Object],[object Object]

Bully Algorithm (Cont.) ,[object Object],[object Object],[object Object]

Bully Algorithm (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ring Algorithm ,[object Object],[object Object],[object Object],[object Object]

Ring Algorithm (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reaching Agreement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Faulty Communications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Faulty Communications (Cont.) ,[object Object],[object Object],[object Object]

Faulty Processes (Byzantine Generals Problem) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Faulty Processes (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chapter 18 - Distributed Coordination

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Chapter 18 - Distributed Coordination