YARN-6368. Decommissioning an NM results in a -1 exit code (miklos.szegedi@cloudera.com via rkanter)

(cherry picked from commit 63f7322522)

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

@@ -80,6 +80,24 @@ import com.google.common.annotations.VisibleForTesting;
 public class NodeManager extends CompositeService 
     implements EventHandler<NodeManagerEvent> {
 
+  /**
+   * Node manager return status codes.
+   */
+  public enum NodeManagerStatus {
+    NO_ERROR(0),
+    EXCEPTION(1);
+
+    private int exitCode;
+
+    NodeManagerStatus(int exitCode) {
+      this.exitCode = exitCode;
+    }
+
+    public int getExitCode() {
+      return exitCode;
+    }
+  }
+
   /**
    * Priority of the NodeManager shutdown hook.
    */
@@ -408,7 +426,7 @@ public class NodeManager extends CompositeService
     return "NodeManager";
   }
 
-  protected void shutDown() {
+  protected void shutDown(final int exitCode) {
     new Thread() {
       @Override
       public void run() {
@@ -419,7 +437,7 @@ public class NodeManager extends CompositeService
         } finally {
           if (shouldExitOnShutdownEvent
               && !ShutdownHookManager.get().isShutdownInProgress()) {
-            ExitUtil.terminate(-1);
+            ExitUtil.terminate(exitCode);
           }
         }
       }
@@ -444,7 +462,7 @@ public class NodeManager extends CompositeService
             .rebootNodeStatusUpdaterAndRegisterWithRM();
         } catch (YarnRuntimeException e) {
           LOG.fatal("Error while rebooting NodeStatusUpdater.", e);
-          shutDown();
+          shutDown(NodeManagerStatus.EXCEPTION.getExitCode());
         }
       }
     }.start();
@@ -700,7 +718,7 @@ public class NodeManager extends CompositeService
   public void handle(NodeManagerEvent event) {
     switch (event.getType()) {
     case SHUTDOWN:
-      shutDown();
+      shutDown(NodeManagerStatus.NO_ERROR.getExitCode());
       break;
     case RESYNC:
       resyncWithRM();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestNodeManagerResync.java

@@ -638,7 +638,7 @@ public class TestNodeManagerResync {
     }
 
     @Override
-    protected void shutDown() {
+    protected void shutDown(int exitCode) {
       synchronized (isNMShutdownCalled) {
         isNMShutdownCalled.set(true);
         isNMShutdownCalled.notify();