YARN-7396. NPE when accessing container logs due to null dirsHandler. Contributed by Jonathan Hung

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

@@ -367,6 +367,8 @@ public class NodeManager extends CompositeService
     
     this.aclsManager = new ApplicationACLsManager(conf);
 
+    this.dirsHandler = new LocalDirsHandlerService(metrics);
+
     boolean isDistSchedulingEnabled =
         conf.getBoolean(YarnConfiguration.DIST_SCHEDULING_ENABLED,
             YarnConfiguration.DEFAULT_DIST_SCHEDULING_ENABLED);
@@ -390,7 +392,6 @@ public class NodeManager extends CompositeService
     // NodeManager level dispatcher
     this.dispatcher = new AsyncDispatcher("NM Event dispatcher");
 
-    dirsHandler = new LocalDirsHandlerService(metrics);
     nodeHealthChecker =
         new NodeHealthCheckerService(
             getNodeHealthScriptRunner(conf), dirsHandler);