Hi App Engine team,
my Pingdom stats for a JSON request that does nothing at all has doubled
(on average) since November 19.
Since your post-mortem for the recent outage mentions you made a poor
performance config-change on that day, I'm pretty sure it has to do with it:
* Our app ("small-improvements-hrd") is on a custom domain, and it's on
https
* Appstats confirms that these no-op requests do nothing (except create a
session) and they take some 100 to 200ms to do so
* The time in the log file is shown as 500 to 2500ms though
* And Pingdom consistently shows 200 to 2500ms as well
* Our average per Pingdom was 700ms until November 19, and now it's 1400ms.
<https://lh3.googleusercontent.com/-z3biVzfKyqk/ULAWzA-2jAI/AAAAAAAAAFM/RZC5_qkkg-E/s1600/Response+Time+Report+noop.png>
It's as if one extra roundtrip was added somewhere. Maybe the algorithm you
described in the post-mortem *still* does something very inefficient?
Just to be sure, our other Pingdom check (which pulls our website front
page) has also doubled. But the no-op is probably more relevant, since it
really does nothing at all except return 1 byte.
<https://lh5.googleusercontent.com/-7N_St4j2kN0/ULAXJ7FZudI/AAAAAAAAAFU/yBIF62LKHHU/s1600/Response+Time+Report+website.png>
Cheers,
Per
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