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Add health check jitter #122

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merged 2 commits into from
Dec 5, 2024
Merged

Add health check jitter #122

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ac16e93
Add health check jitter
klauspost Dec 5, 2024
5e836c2
Fix lint
klauspost Dec 5, 2024
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10 changes: 6 additions & 4 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -313,6 +313,7 @@ func getHealthCheckURL(endpoint, healthCheckPath string, healthCheckPort int) (s

// healthCheck - background routine which checks if a backend is up or down.
func (b *Backend) healthCheck(ctxt context.Context) {
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
timer := time.NewTimer(b.healthCheckDuration)
defer timer.Stop()
for {
Expand All @@ -324,7 +325,8 @@ func (b *Backend) healthCheck(ctxt context.Context) {
if err != nil {
console.Errorln(err)
}
timer.Reset(b.healthCheckDuration)
// Add random jitter to call
timer.Reset(b.healthCheckDuration + time.Duration(rng.Int63n(int64(b.healthCheckDuration))))
}
}
}
Expand Down Expand Up @@ -578,7 +580,7 @@ func (s *site) nextProxy() (*Backend, func()) {
}
switch globalHostBalance {
case "least":
min := int64(math.MaxInt64)
minCall := int64(math.MaxInt64)
earliest := int64(math.MaxInt64)
idx := 0
// Shuffle before picking the least connection to ensure all nodes
Expand All @@ -588,8 +590,8 @@ func (s *site) nextProxy() (*Backend, func()) {
})
for i, backend := range backends {
currentCalls := backend.Stats.CurrentCalls.Load()
if currentCalls < min {
min = currentCalls
if currentCalls < minCall {
minCall = currentCalls
lastFinished := backend.Stats.LastFinished.Load()
if lastFinished < earliest {
earliest = lastFinished
Expand Down
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