Reliable vs. Unreliable Primitives
Transmission problems:
corruption loss duplication reordering
Recovery mechanism: Where?
Reliable transmission: acknowledgments
At-least-one vs. exactly-one semantics
send
receive
time-out
send
receive
time-out
A = 0
inc(A)
A = 1
A = 2
inc(A)
A = 0
inc(A)
A = 1
A = 1
inc(A)
deja-vu!
request table
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