...

         {"topic": "topic-test",

           "partition": 1, 

           "replicas": [1,2,3] },

            {"topic": "topic-test",

           "partition": 2,

           "replicas": [1,2,3] } 

        ],

         "version":1

...

So it is necessary to add to add a tool to deal with replica and leader balance. 

 Proposed Changes

We use an algorithm to get a balanced assignment of replicas or leaders,and call ReassignPartitionsCommand to let kafka sever move replicas or change the position of replicas in ARs. 

Public Interfaces

Compatibility, Deprecation, and Migration Plan

...