@Override
      public boolean evaluate() throws Exception {
        List<String> regions = getTableRegionMap().get(tableName);
        if (regions == null) {
          return false;
        }
        return getTableRegionMap().get(tableName).size() >= tableRegionCount;
      }
Randomly choose a region to set state.
@param newGroup target group
@return source server of region, and region state
@throws IOException if methods called throw
hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java