Improve consistent hash performance in single-node case
Improve consistent hash performance in single-node case

iain-buclaw-sociomantic/carbon,mleinart/carbon,piotr1212/carbon,deniszh/carbon,criteo-forks/carbon,criteo-forks/carbon,krux/carbon,graphite-project/carbon,johnseekins/carbon,graphite-project/carbon,iain-buclaw-sociomantic/carbon,krux/carbon,obfuscurity/carbon,johnseekins/carbon,deniszh/carbon,obfuscurity/carbon,piotr1212/carbon,mleinart/carbon