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Question @tacertain @colmmacc @_msw_ -- are there other great examples / stories of "the unseen pain avoided"? E.g. this thread, as I understand it, describes how an operational issue allowed an A/B test of the impact of latency on business metrics, thus providing evidence (1/4)
If you're wondering what "P-four-nines" means, it's the latency at the 99.99th percentile, meaning only one in 10,000 requests has a worse latency. Why do we measure latency in percentiles? A thread about how how it came to be at Amazon...
Tim Bray on Twitter
“Was in a conversation about some service refactoring and the guy said “mean latency was a bit worse, but our P-four-nines was rock-solid and only twice the mean. Customer loved it.” #CloudThinking”
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