YARN-11122. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/RouterMetrics.java

@@ -76,8 +76,7 @@ public final class RouterMetrics {
   @Metric("Total number of successful Retrieved getClusterMetrics and "
       + "latency(ms)")
   private MutableRate totalSucceededGetClusterMetricsRetrieved;
-  @Metric("Total number of successful Retrieved getClusterNodes and "
-          + "latency(ms)")
+  @Metric("Total number of successful Retrieved getClusterNodes and latency(ms)")
   private MutableRate totalSucceededGetClusterNodesRetrieved;
 
   /**

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/clientrm/RouterYarnClientUtils.java

@@ -17,12 +17,20 @@
  */
 package org.apache.hadoop.yarn.server.router.clientrm;
 
-import java.util.*;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.List;
+import java.util.ArrayList;
 
 import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationsResponse;
 import org.apache.hadoop.yarn.api.protocolrecords.GetClusterMetricsResponse;
 import org.apache.hadoop.yarn.api.protocolrecords.GetClusterNodesResponse;
-import org.apache.hadoop.yarn.api.records.*;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.api.records.ApplicationReport;
+import org.apache.hadoop.yarn.api.records.ApplicationResourceUsageReport;
+import org.apache.hadoop.yarn.api.records.YarnClusterMetrics;
+import org.apache.hadoop.yarn.api.records.NodeReport;
 import org.apache.hadoop.yarn.server.uam.UnmanagedApplicationManager;
 import org.apache.hadoop.yarn.util.Records;
 import org.apache.hadoop.yarn.util.resource.Resources;