Hadoop 3 API Changes
Summarizes the API changes introduced in Hadoop 3.
EEP 9.0.0 supports Hadoop 3 for use with release
      7.1.0. The following table describes command changes that accompany Hadoop 3:
  | Notes | See for more information . . . | 
|---|---|
| Even though EEP 9.0.0 includes Hadoop 3, the Hadoop 2 commands continue to be supported. | Supported Commands for Hadoop | 
Hadoop 3 includes a new package for metrics instrumentation:
                  org.apache.hadoop.metrics2 replaces the previous package,
                  org.apache.hadoop.metrics. | 
              Package org.apache.hadoop.metrics2 | 
| The mapreduce and jhs APIs are unchanged in Hadoop 3. | N/A | 
| The YARN Application Timeline Service (ATS v2) has a new API. Because ATS v2 was not supported for Hadoop 2, this API is completely new. | YARN Timeline Service v2 | 
| The Resource Manager (RM) has a new endpoint. | ResourceManager REST APIs | 
| The Node Manager (NM) has a new auxiliary services endpoint. | NodeManager REST APIs |