YARN-7067. [YARN-3926] Optimize ResourceType information display in UI. Contributed by Wangda Tan.

(cherry picked from commit a333ba54e3)

Conflicts:
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/MetricsOverviewTable.java

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ResourceTypeInfo.java

@@ -153,8 +153,11 @@ public abstract class ResourceTypeInfo implements Comparable<ResourceTypeInfo> {
 
   @Override
   public String toString() {
-    return "name: " + this.getName() + ", units: " + this.getDefaultUnit()
+    StringBuilder sb = new StringBuilder();
-        + ", type: " + getResourceType();
+    sb.append("<name=").append(this.getName()).append(" default-unit=").append(
+        this.getDefaultUnit()).append(" type=" + getResourceType()).append(
+        ">");
+    return sb.toString();
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/MetricsOverviewTable.java

@@ -19,17 +19,21 @@
 package org.apache.hadoop.yarn.server.resourcemanager.webapp;
 
 import org.apache.hadoop.util.StringUtils;
+import org.apache.hadoop.yarn.api.records.ResourceTypeInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ClusterMetricsInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.UserMetricsInfo;
 
+import org.apache.hadoop.yarn.util.resource.ResourceUtils;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.DIV;
 import org.apache.hadoop.yarn.webapp.view.HtmlBlock;
 
 import com.google.inject.Inject;
 
+import java.util.Arrays;
+
 /**
  * Provides an table with an overview of many cluster wide metrics and if
  * per user metrics are enabled it will show an overview of what the
@@ -169,7 +173,7 @@ public class MetricsOverviewTable extends HtmlBlock {
       }
     }
 
-    SchedulerInfo schedulerInfo=new SchedulerInfo(this.rm);
+    SchedulerInfo schedulerInfo = new SchedulerInfo(this.rm);
     
     div.h3("Scheduler Metrics").
     table("#schedulermetricsoverview").
@@ -186,7 +190,8 @@ public class MetricsOverviewTable extends HtmlBlock {
     tbody().$class("ui-widget-content").
       tr().
         td(String.valueOf(schedulerInfo.getSchedulerType())).
-        td(String.valueOf(schedulerInfo.getSchedulerResourceTypes())).
+        td(String.valueOf(Arrays.toString(ResourceUtils.getResourcesTypeInfo()
+            .toArray(new ResourceTypeInfo[0])))).
         td(schedulerInfo.getMinAllocation().toString()).
         td(schedulerInfo.getMaxAllocation().toString()).
         td(String.valueOf(schedulerInfo.getMaxClusterLevelAppPriority())).