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Velocity 2011: John Rauser, "Look at Your Data"

O'Reilly · Youtube · 3 HN comments
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Youtube Summary
Modern monitoring software makes it easy to plot a statistic like
average latency every minute -- too easy. Fancy dashboards of time
series plots often lull us into a false sense of security. Underneath
every point on those plots is a distribution, and underneath that
distribution is a series of individuals: your customers.
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All the comments and stories posted to Hacker News that reference this video.
Whenever this topic comes up, I always encourage folks to watch this 2011 classic 15m talk at the Velocity conference by John Rauser:

https://www.youtube.com/watch?v=coNDCIMH8bk

One of my favorite (short) talks on this topic. Well worth a few minutes of your time:

https://www.youtube.com/watch?v=coNDCIMH8bk

Aengeuad
I know it's in the spirit of the talk, but the histogram at 10:45 and the related discussion about how the latency improved for most users but the average latency increasing meaning a worse experience for other users reminds me of the anecdote a Google engineer had when Youtube started rolling out their HTML5 player, the responsiveness of the page had increased but the average latency graphs went up. This wasn't down to it being a bad update, or some users getting a worse experience - not really anyway, but the switch to the HTML5 player allowed a wider audience to start using Youtube where they wouldn't have been able to do this previously. A change increasing average latency, even on a histogram, doesn't necessarily mean it's a bad change. Look at your data indeed.
Here are two other great talks by one of my friends at Amazon.

http://www.youtube.com/watch?v=UL2WDcNu_3A

http://www.youtube.com/watch?v=coNDCIMH8bk

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