golang 八行代码实现的一致性哈希
A Fast, Minimal Memory, Consistent Hash Algorithm
https://arxiv.org/abs/1406.2294
https://github.com/dgryski/go-jump
// Hash consistently chooses a hash bucket number in the range [0, numBuckets) for the given key. numBuckets must be >= 1.
func Hash(key uint64, numBuckets int) int32 {
var b int64 = -1
var j int64
for j < int64(numBuckets) {
b = j
key = key*2862933555777941757 + 1
j = int64(float64(b+1) * (float64(int64(1)<<31) / float64((key>>33)+1)))
}
return int32(b)
}
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