Analyze the correctness and message complexity of the Chandy-Lamport algorithm. How does it handle process failures and concurrent message exchanges?
Added by Tiffany P.
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It operates in a system where processes communicate by sending messages over channels. The algorithm ensures that the snapshot reflects a state where all messages sent during the snapshot are either included or excluded, maintaining consistency. Show more…
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(a) Prove or disprove the following statement: Lamport's mutual exclusion algorithm will work correctly even if channels are not FIFO. (b) Illustrate with an example that under Lamport's mutual exclusion algorithm, a process may not have to wait until its request reaches other processes to access critical section. (c) Prove that under Ricart Agrawala's mutual exclusion algorithm, request for accessing critical section will be satisfied in ascending order of the timestamps of the requests of the processes. (d) Prove or disprove the following statement: Ricart-Agrawla's mutual exclusion algorithm allows a process to access critical section more than once while other processes are waiting to access critical section. (e) Prove or disprove the following statement: Under Suzuki-Kasami's algorithm, a process may enter critical section more than once while other processes are waiting to access critical section (i.e., other processes have pending requests).
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Implement a 2-phase distributed commit (2PC) protocol and use controlled and randomly injected failures to study how the 2PC protocol handles node crashes. Assume one coordinator and at least two participants in the 2PC protocol. Similar to the previous projects, we use multiple processes to emulate multiple nodes. Each node (both the coordinator and the participants) devises a timeout mechanism when no response is received and transitions to either the abort or commit state. For simplicity, you can assume that only one node fails in the controlled test. Evaluate different possibilities of failures (e.g., coordinator fails before or after sending commit message). To emulate a failure, you can impose a much longer delay at a failed node than the timeout period used by other active nodes. Nodes print their states (commit/abort) before termination.
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