YARN-6072. RM unable to start in secure mode. Contributed by Ajith S.

(cherry picked from commit a6b06f71797ad1ed9edbcef279bcf7d9e569f955)

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

@@ -708,7 +708,7 @@ public class AdminService extends CompositeService implements
       }
       refreshClusterMaxPriority();
     } catch (Exception ex) {
-      throw new ServiceFailedException(ex.getMessage());
+      throw new ServiceFailedException("RefreshAll operation failed", ex);
     }
   }
 

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

@@ -256,15 +256,6 @@ public class ResourceManager extends CompositeService implements Recoverable {
     this.rmContext.setHAEnabled(HAUtil.isHAEnabled(this.conf));
     if (this.rmContext.isHAEnabled()) {
       HAUtil.verifyAndSetConfiguration(this.conf);
-
-      // If the RM is configured to use an embedded leader elector,
-      // initialize the leader elector.
-      if (HAUtil.isAutomaticFailoverEnabled(conf) &&
-          HAUtil.isAutomaticFailoverEmbedded(conf)) {
-        EmbeddedElector elector = createEmbeddedElector();
-        addIfService(elector);
-        rmContext.setLeaderElectorService(elector);
-      }
     }
 
     // Set UGI and do login
@@ -282,10 +273,27 @@ public class ResourceManager extends CompositeService implements Recoverable {
     addIfService(rmDispatcher);
     rmContext.setDispatcher(rmDispatcher);
 
+    // The order of services below should not be changed as services will be
+    // started in same order
+    // As elector service needs admin service to be initialized and started,
+    // first we add admin service then elector service
+
     adminService = createAdminService();
     addService(adminService);
     rmContext.setRMAdminService(adminService);
 
+    // elector must be added post adminservice
+    if (this.rmContext.isHAEnabled()) {
+      // If the RM is configured to use an embedded leader elector,
+      // initialize the leader elector.
+      if (HAUtil.isAutomaticFailoverEnabled(conf)
+          && HAUtil.isAutomaticFailoverEmbedded(conf)) {
+        EmbeddedElector elector = createEmbeddedElector();
+        addIfService(elector);
+        rmContext.setLeaderElectorService(elector);
+      }
+    }
+
     rmContext.setYarnConfiguration(conf);
     
     createAndInitActiveServices(false);