[Solr Wiki] Trivial Update of "NewSolrCloudDesign" by YonikSeeley

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The "NewSolrCloudDesign" page has been changed by YonikSeeley:
http://wiki.apache.org/solr/NewSolrCloudDesign?action=diff&rev1=6&rev2=7

  (hash(user_id)<<24) | (hash(message_id)>>>8)
  }}}
  By deriving the top 8 bits of the hashcode from the user_id, it guarantees that any users emails are in the same 256th portion of the cluster.  At search time, this information can be used to only query that portion of the cluster.
+ 
+ We probably also want to view the hash space as a ring (as is done with consistent hashing) in order to express ranges that wrap (cross from the maximum value to the minimum value).
  
  == Shard Assignment ==