What is the consistency issue raised by state transfer, Software Engineering

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QUESTION

(a) Explain why making some replica managers read-only may improve the performance of a gossip system.

(b) In the gossip architecture, why does a replica manager need to keep both a replica timestamp and a value timestamp?

(c) Explain why allowing backups to process read operations leads to sequentially consistent rather than linear executions in a passive replication system.

(d) What is the consistency issue raised by state transfer?

(e) Explain why a multi-threaded server might not qualify as a state machine.


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