Although he's been quiet for a while on here, Unmesh Joshi has been working hard on more of his Patterns of Distributed Systems. In this first of a new batch, he looks at the difficulty of getting consistent reads from servers in the presence of the inevitable drifts between system logs. A Clock-Bound Wait adds a small wait time on a request for a value at a recent time. This way the server can be sure it's providing the correct value should it have changed during within the window of the clock lag.
https://martinfowler.com/articles/patterns-of-distributed-systems/clock-bound.html
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