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satellite/repair: clamp totalNodes to 100 or higher

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Change-Id: I239418ed3671b1cee30b0b1797dc434244e72448
This commit is contained in:
paul cannon 2020-12-30 10:38:13 -06:00
parent 641f01ed42
commit 7246368ca1
1 changed files with 10 additions and 1 deletions
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11
satellite/repair/priority.go
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@ -33,6 +33,12 @@ import "math"
// days, we divide the mean of the negative binomial distribution (X, above) by
// the number of nodes that we estimate will churn in one day.
func SegmentHealth(numHealthy, minPieces, totalNodes int, failureRate float64) float64 {
if totalNodes < minTotalNodes {
// this model gives wonky results when there are too few nodes; pretend
// there are more nodes than there really are so that the model gives
// sane repair priorities
totalNodes = minTotalNodes
}
churnPerRound := float64(totalNodes) * failureRate
if churnPerRound < minChurnPerRound {
// we artificially limit churnPerRound from going too low in cases
@ -52,4 +58,7 @@ func SegmentHealth(numHealthy, minPieces, totalNodes int, failureRate float64) f
return mean1 / churnPerRound
}
const minChurnPerRound = 1e-10
const (
minChurnPerRound = 1e-10
minTotalNodes = 100
)