HDFS-14152. RBF: Fix a typo in RouterAdmin usage. Contributed by Ayush Saxena.

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/tools/federation/RouterAdmin.java

@@ -109,7 +109,7 @@ public class RouterAdmin extends Configured implements Tool {
           {"-add", "-update", "-rm", "-ls", "-setQuota", "-clrQuota",
               "-safemode", "-nameservice", "-getDisabledNameservices"};
       StringBuilder usage = new StringBuilder();
-      usage.append("Usage: hdfs routeradmin :\n");
+      usage.append("Usage: hdfs dfsrouteradmin :\n");
       for (int i = 0; i < commands.length; i++) {
         usage.append(getUsage(commands[i]));
         if (i + 1 < commands.length) {

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterAdminCLI.java

@@ -549,7 +549,7 @@ public class TestRouterAdminCLI {
 
     argv = new String[] {"-Random"};
     assertEquals(-1, ToolRunner.run(admin, argv));
-    String expected = "Usage: hdfs routeradmin :\n"
+    String expected = "Usage: hdfs dfsrouteradmin :\n"
         + "\t[-add <source> <nameservice1, nameservice2, ...> <destination> "
         + "[-readonly] [-order HASH|LOCAL|RANDOM|HASH_ALL] "
         + "-owner <owner> -group <group> -mode <mode>]\n"