ISPN-180 requires changes in ConsistentHash interface. This is a public interface in 4.x as its implementation is pluggable.

1. Is this something we want to do? I think we should doi it as a) the migration to new impl is relatively simple b) I don't think this is has a highly used feature 

2. The interface I need for implementing ISPN-180 looks something like: http://www.pastie.org/1250789

Last three methods were added, and two methods were removed: getDistance and isAdjacent 

How does this look to you?

Cheers,

Mircea