42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
package agent
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import (
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"math"
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"math/rand"
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"time"
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)
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const (
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// This scale factor means we will add a minute after we
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// cross 128 nodes, another at 256, another at 512, etc.
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// By 8192 nodes, we will scale up by a factor of 8
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aeScaleThreshold = 128
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)
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// aeScale is used to scale the time interval at which anti-entropy
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// take place. It is used to prevent saturation as the cluster size grows
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func aeScale(interval time.Duration, n int) time.Duration {
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// Don't scale until we cross the threshold
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if n <= aeScaleThreshold {
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return interval
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}
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multiplier := math.Ceil(math.Log2(float64(n))-math.Log2(aeScaleThreshold)) + 1.0
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return time.Duration(multiplier) * interval
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}
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// Returns a random stagger interval between 0 and the duration
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func randomStagger(intv time.Duration) time.Duration {
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return time.Duration(uint64(rand.Int63()) % uint64(intv))
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}
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// strContains checks if a list contains a string
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func strContains(l []string, s string) bool {
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for _, v := range l {
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if v == s {
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return true
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}
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}
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return false
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}
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