Phoenix 180

First revision for review.  There are some open points here.  Still no test case added to consume the stats.  Will do the performance test once the system is available with me.
    Actually, I don't think we'll even need minKey/maxKey at this point. Just the guideposts
Okie.  I will keep a map for the min key and max key at least in the impl level (incase we need to use it later )and a list for the guide posts then.  So the API will return a map for the min key and max key and list for the guide posts.