HBASE-27066 The Region Visualizer display failed (apache#4472)

Signed-off-by: Andrew Purtell <apurtell@apache.org>

Author: tomscut

hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/master/MasterStatusTmpl.jamon

@@ -278,7 +278,7 @@ AssignmentManager assignmentManager = master.getAssignmentManager();
         </section>
         <section>
             <h2><a name="region_visualizer"></a>Region Visualizer</h2>
-            <& RegionVisualizerTmpl &>
+            <& RegionVisualizerTmpl; master = master &>
         </section>
         <section>
             <h2><a name="peers">Peers</a></h2>

hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/master/RegionVisualizerTmpl.jamon

@@ -16,6 +16,21 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 </%doc>
+<%args>
+HMaster master;
+</%args>
+<%import>
+org.apache.hadoop.hbase.master.HMaster;
+org.apache.hadoop.hbase.ServerName;
+org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
+</%import>
+
+<%java>
+ServerName active_master = master.getActiveMaster().orElse(null);
+Preconditions.checkState(active_master != null, "Failed to retrieve active master's ServerName!");
+String activeHostname = active_master.getHostname();
+int activeInfoPort = master.getActiveMasterInfoPort();
+</%java>
 
     <script type="text/javascript" src="/static/js/vega@5.19.1.min.js"></script>
     <script type="text/javascript" src="/static/js/vega-lite@5.0.0.min.js"></script>
@@ -29,7 +44,7 @@ limitations under the License.
           description: 'Total `storefileSize` per Region Server',
           data: {
             name: 'region_info',
-            url: 'http://localhost:16010/api/v1/admin/cluster_metrics/live_servers',
+            url: 'http://<% activeHostname %>:<% activeInfoPort %>/api/v1/admin/cluster_metrics/live_servers',
             format: { type: 'json', property: 'data' }
           },
           transform: [