HDFS-9151. Mover should print the exit status/reason on console like balancer tool. (Contributed by Surendra singh lilhore)

(cherry picked from commit 0faa4efa3d)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1145,6 +1145,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-11098. [JDK8] Max Non Heap Memory default changed between JDK7
     and 8 (ozawa).
 
+    HDFS-9151. Mover should print the exit status/reason on console like
+    balancer tool. (Surendra singh lilhore via vinayakumarb)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/mover/Mover.java

@@ -571,12 +571,23 @@ public class Mover {
             IOUtils.cleanup(LOG, nnc);
             iter.remove();
           } else if (r != ExitStatus.IN_PROGRESS) {
+            if (r == ExitStatus.NO_MOVE_PROGRESS) {
+              System.err.println("Failed to move some blocks after "
+                  + m.retryMaxAttempts + " retries. Exiting...");
+            } else if (r == ExitStatus.NO_MOVE_BLOCK) {
+              System.err.println("Some blocks can't be moved. Exiting...");
+            } else {
+              System.err.println("Mover failed. Exiting with status " + r
+                  + "... ");
+            }
             // must be an error statue, return
             return r.getExitCode();
           }
         }
         Thread.sleep(sleeptime);
       }
+      System.out.println("Mover Successful: all blocks satisfy"
+          + " the specified storage policy. Exiting...");
       return ExitStatus.SUCCESS.getExitCode();
     } finally {
       for (NameNodeConnector nnc : connectors) {
@@ -781,4 +792,4 @@ public class Mover {
       System.exit(-1);
     }
   }
-}
+}