UNIT - I Characterization of Distributed Systems - Introduction, Examples of Distributed systems, Resource sharing and web, challenges, System models - Introduction, Architectural and Fundamental models, Networking and Internetworking, Interprocess Communication, Distributed objects and Remote Invocation - Introduction, Communication between distributed objects, RPC, Events and notifications, Case study - Java RMI. (Chapter - 1) UNIT - II Operating System Support - Introduction, OS layer, Protection, Processes and Threads, Communication and Invocation, Operating system architecture, Distributed File Systems - Introduction, File Service architecture. (Chapter - 2) UNIT - III Peer to Peer Systems - Introduction, Napster and its legacy, Peer to Peer middleware, Routing overlays, Overlay case studies - Pastry, Tapestry, Application case studies - Squirrel, OceanStore. Time and Global States - Introduction, Clocks, events and Process states, Synchronizing physical clocks, logical time and logical clocks, global states, distributed debugging. Coordination and Agreement - Introduction, Distributed mutual exclusion, Elections, Multicast communication, consensus and related problems. (Chapter - 3) UNIT - IV Transactions and Concurrency Control - Introduction, Transactions, Nested Transactions, Locks, Optimistic concurrency control, Timestamp ordering. Distributed Transactions - Introduction, Flat and Nested Distributed Transactions, Atomic commit protocols, Concurrency control in distributed transactions, Distributed deadlocks, Transaction recovery. (Chapter - 4) UNIT - V Replication - Introduction, System model and group communication, Fault tolerant services, Transactions with replicated data. Distributed shared memory, Design and Implementation issues, Consistency models. (Chapter - 5)
