HDFS-16728. modify patch based on comments

Author: zengqiang.xu

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java

@@ -1765,7 +1765,7 @@ protected List<RemoteLocation> getLocationsForPath(String path,
         }
       }
       if (locs.isEmpty()) {
-        throw new NoLocationException(path, this.subclusterResolver.getClass().getSimpleName());
+        throw new NoLocationException(path, this.subclusterResolver.getClass());
       }
       return locs;
     } catch (IOException ioe) {

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

@@ -1558,9 +1558,9 @@ public void testMkdirWithDisableNameService() throws Exception {
 
     try {
       FsPermission permission = new FsPermission("777");
+      RouterRpcServer rpcServer = router.getRouter().getRpcServer();
       LambdaTestUtils.intercept(NoLocationException.class,
-          () -> router.getRouter().getRpcServer()
-              .mkdirs("/mnt/folder0/folder1", permission, true));
+          () -> rpcServer.mkdirs("/mnt/folder0/folder1", permission, true));
     } finally {
       activeNamenodeResolver.clearDisableNamespaces();
     }