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timmc/elb-hysteresis-2-10.svg

Last active June 5, 2019 19:51
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Simulating ELB-style hysteresis for a host that exhibits random failures for both the healthcheck and regular requests
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elb-hysteresis-2-10.svg
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<text><tspan font-family="Arial" >Server failure rate</tspan></text>
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<g id="gnuplot_plot_1" ><title>server uptime</title>
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<text><tspan font-family="Arial" >server uptime</tspan></text>
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<g id="gnuplot_plot_2" ><title>effective failure rate</title>
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<text><tspan font-family="Arial" >effective failure rate</tspan></text>
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Raw
elb-hysteresis.clj
(ns adhoc.hysteresis)
(def iterations 10000)
(defn simulate
[trip recover failure-rate]
(let [min-window (max trip recover)
;; Server up/down state over time
updown (->> (concat
;; Fake a recent history of being healthy
(repeat (dec min-window) true)
;; Lazy seq of future healthcheck results
(repeatedly iterations #(< failure-rate (rand))))
;; Chop into rolling windows of healthcheck results
(partition min-window 1)
;; Statefully map healthchecks into server in/out
(reductions
(fn new-health [in-service? window]
(if in-service?
(not (every? #(= % false) (take-last trip window)))
(every? #(= % true) (take recover window))))
;; Initial state: In service
true)
;; Drop initial service state
(rest))
;; Analysis
up-periods (count (filter identity updown))
uptime (/ up-periods iterations)]
{:updown updown
:uptime uptime
:effective-failure-rate (* uptime failure-rate)
:state-changes (count (partition-by identity updown))
;; Record settings
:iterations iterations
:trip trip
:recover recover
:failure-rate failure-rate}))
(defn report
[results]
(let [{:keys [uptime state-changes iterations effective-failure-rate]} results]
(printf "Server in service %.03f of the time with %s state changes "
(float uptime)
state-changes)
(printf "(out of %s healthcheck intervals)\n" iterations)
(printf "Effective undiluted error rate: %.03f\n"
(float effective-failure-rate))))
(comment
(doseq [failure-rate (range 0 1.001 0.01)]
(apply printf "%.02f\t%.05f\t%.05f\n"
(map float ((juxt :failure-rate :uptime :effective-failure-rate)
(simulate 2 10 failure-rate)))))
;; gnuplot -e "set terminal svg size 500,400 background rgb 'white'; set xlabel 'Server failure rate'; set xrange [0:1]; set yrange [0:1]; plot 'output.tsv' using 1:2 title 'server uptime', 'output.tsv' using 1:3 title 'effective failure rate'" > output.svg
)
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