HDFS-7154. Fix returning value of starting reconfiguration task (Lei Xu via Colin P. McCabe)

(cherry picked from commit 7aab5fa1bd9386b036af45cd8206622a4555d74a)
(cherry picked from commit 8c3b007236e01c7ad4922d1bf611e68d09adcfa8)

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

@@ -908,6 +908,9 @@ Release 2.6.0 - UNRELEASED
 
     HDFS-7167. NPE while running Mover if the given path is for a file. (jing9)
 
+    HDFS-7154. Fix returning value of starting reconfiguration task (Lei Xu via
+    Colin P. McCabe)
+
 Release 2.5.1 - 2014-09-05
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java

@@ -1396,11 +1396,12 @@ public class DFSAdmin extends FsShell {
       ClientDatanodeProtocol dnProxy = getDataNodeProxy(address);
       dnProxy.startReconfiguration();
       System.out.println("Started reconfiguration task on DataNode " + address);
+      return 0;
     } else {
       System.err.println("Node type " + nodeType +
           " does not support reconfiguration.");
+      return 1;
     }
-    return -1;
   }
 
   int getReconfigurationStatus(String nodeType, String address,
@@ -1438,11 +1439,11 @@ public class DFSAdmin extends FsShell {
         }
       } catch (IOException e) {
         err.println("DataNode reloading configuration: " + e + ".");
-        return -1;
+        return 1;
       }
     } else {
       err.println("Node type " + nodeType + " does not support reconfiguration.");
-      return -1;
+      return 1;
     }
     return 0;
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSAdmin.java

@@ -35,7 +35,6 @@ import java.io.File;
 import java.io.IOException;
 import java.io.PrintStream;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Scanner;
 
@@ -109,7 +108,7 @@ public class TestDFSAdmin {
     final int port = datanode.getIpcPort();
     final String address = "localhost:" + port;
 
-    admin.startReconfiguration("datanode", address);
+    assertThat(admin.startReconfiguration("datanode", address), is(0));
 
     List<String> outputs = null;
     int count = 100;