anchor.diff:  | Amazon EMR        | 3.0.x
   | Amazon EMR        | 2.4.x
   
  +| Cloudera CDH      | 5.5.x
   | Cloudera CDH      | 5.4.x
   | Cloudera CDH      | 5.3.x
   | Cloudera CDH      | 5.2.x
  
positive.code: | Pivotal HD        | 2.0.x
  | Pivotal HD        | 1.1.x
  
  | MapR              | 5.0.x
  | MapR              | 4.1.x
  | MapR              | 4.0.x
  | MapR              | 3.1.x
  
negative.code: | Apache Hadoop     | 1.2.x
  | Apache Hadoop     | 1.1.x
  
  | Amazon EMR        | 4.2.x
  | Amazon EMR        | 4.1.x
  | Amazon EMR        | 4.0.x
  | Amazon EMR        | 3.8.x
  