HDFS-16628 RBF: Correct target directory when move to trash for kerberos login user. (#4424). Contributed by Xiping Zhang.

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/MountTableResolver.java

@@ -359,7 +359,7 @@ public class MountTableResolver
   public static String getTrashRoot() throws IOException {
     // Gets the Trash directory for the current user.
     return FileSystem.USER_HOME_PREFIX + "/" +
-        RouterRpcServer.getRemoteUser().getUserName() + "/" +
+        RouterRpcServer.getRemoteUser().getShortUserName() + "/" +
         FileSystem.TRASH_PREFIX;
   }
 

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

@@ -189,6 +189,44 @@ public class TestRouterTrash {
     assertEquals(2, fileStatuses.length);
   }
 
+  @Test
+  public void testMoveToTrashWithKerberosUser() throws IOException,
+      URISyntaxException, InterruptedException {
+    //Constructs the structure of the KerBoers user name
+    String kerberosUser = "randomUser/dev@HADOOP.COM";
+    UserGroupInformation ugi = UserGroupInformation.createRemoteUser(kerberosUser);
+    MountTable addEntry = MountTable.newInstance(MOUNT_POINT,
+        Collections.singletonMap(ns1, MOUNT_POINT));
+    assertTrue(addMountTable(addEntry));
+    // current user client
+    MiniRouterDFSCluster.NamenodeContext nn1Context = cluster.getNamenode(ns1, null);
+    DFSClient currentUserClientNs0 = nnContext.getClient();
+    DFSClient currentUserClientNs1 = nn1Context.getClient();
+
+    currentUserClientNs0.setOwner("/", ugi.getShortUserName(), ugi.getShortUserName());
+    currentUserClientNs1.setOwner("/", ugi.getShortUserName(), ugi.getShortUserName());
+
+    // test user client
+    DFSClient testUserClientNs1 = nn1Context.getClient(ugi);
+    testUserClientNs1.mkdirs(MOUNT_POINT, new FsPermission("777"), true);
+    assertTrue(testUserClientNs1.exists(MOUNT_POINT));
+    // create test file
+    testUserClientNs1.create(FILE, true);
+    Path filePath = new Path(FILE);
+
+    FileStatus[] fileStatuses = routerFs.listStatus(filePath);
+    assertEquals(1, fileStatuses.length);
+    assertEquals(ugi.getShortUserName(), fileStatuses[0].getOwner());
+    // move to Trash
+    Configuration routerConf = routerContext.getConf();
+    FileSystem fs = DFSTestUtil.getFileSystemAs(ugi, routerConf);
+    Trash trash = new Trash(fs, routerConf);
+    assertTrue(trash.moveToTrash(filePath));
+    fileStatuses = fs.listStatus(
+        new Path("/user/" + ugi.getShortUserName() + "/.Trash/Current" + MOUNT_POINT));
+    assertEquals(1, fileStatuses.length);
+  }
+
   @Test
   public void testDeleteToTrashExistMountPoint() throws IOException,
       URISyntaxException, InterruptedException {