HDFS-8552. Fix hdfs CLI usage message for namenode and zkfc. Contributed by Brahma Reddy Battula

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ZKFailoverController.java

@@ -84,7 +84,7 @@ public abstract class ZKFailoverController {
   };
   
   protected static final String USAGE = 
-      "Usage: java zkfc [ -formatZK [-force] [-nonInteractive] ]";
+      "Usage: hdfs zkfc [ -formatZK [-force] [-nonInteractive] ]";
 
   /** Unable to format the parent znode in ZK */
   static final int ERR_CODE_FORMAT_DENIED = 2;

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

@@ -612,6 +612,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8553. Document hdfs class path options.
     (Brahma Reddy Battula via cnauroth)
 
+    HDFS-8552. Fix hdfs CLI usage message for namenode and zkfc.
+    (Brahma Reddy Battula via xyao)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java

@@ -246,7 +246,7 @@ public class NameNode implements NameNodeStatusMXBean {
     DFS_HA_AUTO_FAILOVER_ENABLED_KEY
   };
   
-  private static final String USAGE = "Usage: java NameNode ["
+  private static final String USAGE = "Usage: hdfs namenode ["
       + StartupOption.BACKUP.getName() + "] | \n\t["
       + StartupOption.CHECKPOINT.getName() + "] | \n\t["
       + StartupOption.FORMAT.getName() + " ["