YARN-7765. Fixed an issue that kerberos tgt not found when NM posting timeline events. Contributed by Rohith Sharma K S

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NodeManager.java

@@ -437,18 +437,15 @@ public class NodeManager extends CompositeService
     addService(nodeStatusUpdater);
     ((NMContext) context).setNodeStatusUpdater(nodeStatusUpdater);
 
-    super.serviceInit(conf);
-    // TODO add local dirs to del
-  }
-
-  @Override
-  protected void serviceStart() throws Exception {
+    // Do secure login before calling init for added services.
     try {
       doSecureLogin();
     } catch (IOException e) {
       throw new YarnRuntimeException("Failed NodeManager login", e);
     }
-    super.serviceStart();
+
+    super.serviceInit(conf);
+    // TODO add local dirs to del
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/timelineservice/NMTimelinePublisher.java

@@ -100,6 +100,7 @@ public class NMTimelinePublisher extends CompositeService {
     this.nmLoginUGI =  UserGroupInformation.isSecurityEnabled() ?
         UserGroupInformation.getLoginUser() :
         UserGroupInformation.getCurrentUser();
+    LOG.info("Initialized NMTimelinePublisher UGI to " + nmLoginUGI);
     super.serviceInit(conf);
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/HBaseTimelineWriterImpl.java

@@ -129,6 +129,11 @@ public class HBaseTimelineWriterImpl extends AbstractService implements
         new FlowActivityTable().getTableMutator(hbaseConf, conn);
     subApplicationTable =
         new SubApplicationTable().getTableMutator(hbaseConf, conn);
+
+    UserGroupInformation ugi = UserGroupInformation.isSecurityEnabled() ?
+        UserGroupInformation.getLoginUser() :
+        UserGroupInformation.getCurrentUser();
+    LOG.info("Initialized HBaseTimelineWriterImpl UGI to " + ugi);
   }
 
   /**