Function normalizeIngestersMap

pkg/ring/model.go:321–352

normalizeIngestersMap will do the following: - sorts tokens and removes duplicates (only within single ingester) - modifies the input ring

(inputRing *Desc)

// - sorts tokens and removes duplicates (only within single ingester)
// - modifies the input ring
func normalizeIngestersMap(inputRing *Desc) {
	// Make sure LEFT ingesters have no tokens
	for n, ing := range inputRing.Ingesters {
		if ing.State == LEFT {
			ing.Tokens = nil
			inputRing.Ingesters[n] = ing
		}

		// Sort tokens, and remove duplicates
		if len(ing.Tokens) == 0 {
			continue
		}

		if !sort.IsSorted(Tokens(ing.Tokens)) {
			sort.Sort(Tokens(ing.Tokens))
		}

		// tokens are sorted now, we can easily remove duplicates.
		prev := ing.Tokens[0]
		for ix := 1; ix < len(ing.Tokens); {
			if ing.Tokens[ix] == prev {
				ing.Tokens = append(ing.Tokens[:ix], ing.Tokens[ix+1:]...)
			} else {
				prev = ing.Tokens[ix]
				ix++
			}
		}

		// write updated value back to map
		inputRing.Ingesters[n] = ing
	}
}

// tokensEqual checks for equality of two slices. Assumes the slices are sorted.
func tokensEqual(lhs, rhs []uint32) bool {