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Be careful of misreading server statistics

Here's a mystery for you.

Background

Over the past weekend, I was "fighting" server outages on another computer where - about once an hour - the httpd daemon appeared to be running away in some sort of hole or denial of service attack. Tricky one to find, as the temporary fix I had in place was in the form of a "heartbeat" script that killed all existing connections and freshened up the server. And when the server was busy, it was so much "treacle" that I couldn't run any Linux commands from a shell to see what was going on.

Mystery

I was aware from my heartbeat log of a total of around 20 seconds per hour during which the server was not accepting requests - that's about 0.5% of the time. Yet I had a user who was telling me that in his experience, downtime was around 10%. Wow - that's some scary figure, isn't it?

Any ideas?

Turns out to be a case of how you gather your statistics!

Solution

My heartbeat script clicks in at the start of every minute and if there's a problem it tidies up - 5 seconds. Having clicked in once, it then does a further precautionary clean the following "top" of minute, and perhaps if it's not sure that load levels are dropping as they should, the following minute. So in a bad hour, 4 outages of 5 seconds = 20 seconds.

It turns out that my user was running an automated script to check our server, again at the top of the minute. So he had syncronised his tests to our server in such a way that he always saw it during that brief clean up. Looking at his log activity later, I noticed that if he got a failure he had programmed in a second hit straight away to confirm it - so he was seeing 4/60 or 8/64 failures - that's 6.5% or 12.5% to report.

Lies, damned lies and statistics

This is a "object lesson" in being careful with statistics - at best, they're helpful and at worst they can give a totally incorrect picture. But I have to say that this example really took the biscuit!

Footnote - server issue solved. Availability now over 99.8% and the remaining outages in the last couple of days relate to me testing.
(written 2008-05-28)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A606 - Web Application Deployment - Apache httpd - log files and log tools
  [376] What brings people to my web site? - (2005-07-13)
  [1237] What proportion of our web traffic is robots? - (2007-06-19)
  [1503] Web page (http) error status 405 - (2008-01-12)
  [1598] Every link has two ends - fixing 404s at the recipient - (2008-04-02)
  [1761] Logging Cookies with the Apache httpd web server - (2008-08-20)
  [1780] Server overloading - turns out to be feof in PHP - (2008-09-01)
  [1796] libwww-perl and Indy Library in your server logs? - (2008-09-13)
  [3015] Logging the performance of the Apache httpd web server - (2010-10-25)
  [3019] Apache httpd Server Status - monitoring your server - (2010-10-28)
  [3027] Server logs - drawing a graph of gathered data - (2010-11-03)
  [3087] Making the most of critical emails - reading behind the scene - (2010-12-16)
  [3443] Getting more log information from the Apache http web server - (2011-09-16)
  [3447] Needle in a haystack - finding the web server overload - (2011-09-18)
  [3491] Who is knocking at your web site door? Are you well set up to deal with allcomers? - (2011-10-21)
  [3554] Learning more about our web site - and learning how to learn about yours - (2011-12-17)
  [3670] Reading Google Analytics results, based on the relative populations of countries - (2012-03-24)
  [3974] TV show appearance - how does it effect your web site? - (2013-01-13)
  [3984] 20 minutes in to our 15 minutes of fame - (2013-01-20)
  [4307] Identifying and clearing denial of service attacks on your Apache server - (2014-09-27)
  [4404] Which (virtual) host was visited? Tuning Apache log files, and Python analysis - (2015-01-23)
  [4491] Web Server Admin - some of those things that happen, and solutions - (2015-05-10)


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Farewell, Newcastle to Stavanger, Haugsund and Bergen
Be careful of misreading server statistics
A date for your diary - 16th July 2008
The old sayings are the best (FSB)
How do Google Ads work?
Old Sarum airfield brings back fond memories
ls command - favourite options
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