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From aajis...@apache.org
Subject hadoop git commit: HDFS-8462. Implement GETXATTRS and LISTXATTRS operations for WebImageViewer. Contributed by Jagadesh Kiran N.
Date Thu, 25 Jun 2015 15:24:09 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 bb8a2cff2 -> 44dbddb02


HDFS-8462. Implement GETXATTRS and LISTXATTRS operations for WebImageViewer. Contributed by
Jagadesh Kiran N.

(cherry picked from commit bc433908d35758ff0a7225cd6f5662959ef4d294)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/44dbddb0
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/44dbddb0
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/44dbddb0

Branch: refs/heads/branch-2
Commit: 44dbddb02287d4b1cf6f531c58f215e64e4f447c
Parents: bb8a2cf
Author: Akira Ajisaka <aajisaka@apache.org>
Authored: Fri Jun 26 00:20:12 2015 +0900
Committer: Akira Ajisaka <aajisaka@apache.org>
Committed: Fri Jun 26 00:22:30 2015 +0900

----------------------------------------------------------------------
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt     |   3 +
 .../offlineImageViewer/FSImageHandler.java      |  57 ++--
 .../tools/offlineImageViewer/FSImageLoader.java |  75 +++++-
 .../src/site/markdown/HdfsImageViewer.md        |   2 +
 .../TestOfflineImageViewerForXAttr.java         | 262 +++++++++++++++++++
 5 files changed, 380 insertions(+), 19 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/44dbddb0/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 2e371bf..f833d2e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -330,6 +330,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8645. Resolve inconsistent code in TestReplicationPolicy between
     trunk and branch-2. (Zhe Zhang via wang)
 
+    HDFS-8462. Implement GETXATTRS and LISTXATTRS operations for WebImageViewer.
+    (Jagadesh Kiran N via aajisaka)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

http://git-wip-us.apache.org/repos/asf/hadoop/blob/44dbddb0/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageHandler.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageHandler.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageHandler.java
index 37db8b7..da02805 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageHandler.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageHandler.java
@@ -22,6 +22,7 @@ import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
 import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
 import static io.netty.handler.codec.http.HttpHeaderValues.CLOSE;
 import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
+import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
 import static io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
 import static io.netty.handler.codec.http.HttpResponseStatus.METHOD_NOT_ALLOWED;
 import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
@@ -74,10 +75,10 @@ class FSImageHandler extends SimpleChannelInboundHandler<HttpRequest>
{
 
   @Override
   public void channelRead0(ChannelHandlerContext ctx, HttpRequest request)
-          throws Exception {
+      throws Exception {
     if (request.method() != HttpMethod.GET) {
       DefaultHttpResponse resp = new DefaultHttpResponse(HTTP_1_1,
-        METHOD_NOT_ALLOWED);
+          METHOD_NOT_ALLOWED);
       resp.headers().set(CONNECTION, CLOSE);
       ctx.write(resp).addListener(ChannelFutureListener.CLOSE);
       return;
@@ -89,25 +90,33 @@ class FSImageHandler extends SimpleChannelInboundHandler<HttpRequest>
{
     final String content;
     String path = getPath(decoder);
     switch (op) {
-      case "GETFILESTATUS":
-        content = image.getFileStatus(path);
-        break;
-      case "LISTSTATUS":
-        content = image.listStatus(path);
-        break;
-      case "GETACLSTATUS":
-        content = image.getAclStatus(path);
-        break;
-      default:
-        throw new IllegalArgumentException(
-            "Invalid value for webhdfs parameter" + " \"op\"");
+    case "GETFILESTATUS":
+      content = image.getFileStatus(path);
+      break;
+    case "LISTSTATUS":
+      content = image.listStatus(path);
+      break;
+    case "GETACLSTATUS":
+      content = image.getAclStatus(path);
+      break;
+    case "GETXATTRS":
+      List<String> names = getXattrNames(decoder);
+      String encoder = getEncoder(decoder);
+      content = image.getXAttrs(path, names, encoder);
+      break;
+    case "LISTXATTRS":
+      content = image.listXAttrs(path);
+      break;
+    default:
+      throw new IllegalArgumentException("Invalid value for webhdfs parameter"
+          + " \"op\"");
     }
 
     LOG.info("op=" + op + " target=" + path);
 
-    DefaultFullHttpResponse resp = new DefaultFullHttpResponse(
-            HTTP_1_1, HttpResponseStatus.OK,
-            Unpooled.wrappedBuffer(content.getBytes(Charsets.UTF_8)));
+    DefaultFullHttpResponse resp = new DefaultFullHttpResponse(HTTP_1_1,
+        HttpResponseStatus.OK, Unpooled.wrappedBuffer(content
+            .getBytes(Charsets.UTF_8)));
     resp.headers().set(CONTENT_TYPE, APPLICATION_JSON_UTF8);
     resp.headers().set(CONTENT_LENGTH, resp.content().readableBytes());
     resp.headers().set(CONNECTION, CLOSE);
@@ -134,8 +143,9 @@ class FSImageHandler extends SimpleChannelInboundHandler<HttpRequest>
{
       resp.setStatus(BAD_REQUEST);
     } else if (e instanceof FileNotFoundException) {
       resp.setStatus(NOT_FOUND);
+    } else if (e instanceof IOException) {
+      resp.setStatus(FORBIDDEN);
     }
-
     resp.headers().set(CONTENT_LENGTH, resp.content().readableBytes());
     resp.headers().set(CONNECTION, CLOSE);
     ctx.write(resp).addListener(ChannelFutureListener.CLOSE);
@@ -147,6 +157,17 @@ class FSImageHandler extends SimpleChannelInboundHandler<HttpRequest>
{
         ? StringUtils.toUpperCase(parameters.get("op").get(0)) : null;
   }
 
+  private static List<String> getXattrNames(QueryStringDecoder decoder) {
+    Map<String, List<String>> parameters = decoder.parameters();
+    return parameters.get("xattr.name");
+  }
+
+  private static String getEncoder(QueryStringDecoder decoder) {
+    Map<String, List<String>> parameters = decoder.parameters();
+    return parameters.containsKey("encoding") ? parameters.get("encoding").get(
+        0) : null;
+  }
+
   private static String getPath(QueryStringDecoder decoder)
           throws FileNotFoundException {
     String path = decoder.path();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/44dbddb0/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
index 351ff03..2a11734 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
@@ -18,7 +18,6 @@
 package org.apache.hadoop.hdfs.tools.offlineImageViewer;
 
 import java.io.BufferedInputStream;
-import java.io.EOFException;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -38,10 +37,12 @@ import com.google.protobuf.InvalidProtocolBufferException;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
+import org.apache.hadoop.hdfs.XAttrHelper;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode;
 import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf;
@@ -49,6 +50,7 @@ import org.apache.hadoop.hdfs.server.namenode.FSImageUtil;
 import org.apache.hadoop.hdfs.server.namenode.FsImageProto;
 import org.apache.hadoop.hdfs.server.namenode.INodeId;
 import org.apache.hadoop.hdfs.web.JsonUtil;
+import org.apache.hadoop.hdfs.web.resources.XAttrEncodingParam;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.util.LimitInputStream;
 import org.codehaus.jackson.map.ObjectMapper;
@@ -309,6 +311,77 @@ class FSImageLoader {
   }
 
   /**
+   * Return the JSON formatted XAttrNames of the specified file.
+   *
+   * @param path
+   *          a path specifies a file
+   * @return JSON formatted XAttrNames
+   * @throws IOException
+   *           if failed to serialize fileStatus to JSON.
+   */
+  String listXAttrs(String path) throws IOException {
+    return JsonUtil.toJsonString(getXAttrList(path));
+  }
+
+  /**
+   * Return the JSON formatted XAttrs of the specified file.
+   *
+   * @param path
+   *          a path specifies a file
+   * @return JSON formatted XAttrs
+   * @throws IOException
+   *           if failed to serialize fileStatus to JSON.
+   */
+  String getXAttrs(String path, List<String> names, String encoder)
+      throws IOException {
+
+    List<XAttr> xAttrs = getXAttrList(path);
+    List<XAttr> filtered;
+    if (names == null || names.size() == 0) {
+      filtered = xAttrs;
+    } else {
+      filtered = Lists.newArrayListWithCapacity(names.size());
+      for (String name : names) {
+        XAttr search = XAttrHelper.buildXAttr(name);
+
+        boolean found = false;
+        for (XAttr aXAttr : xAttrs) {
+          if (aXAttr.getNameSpace() == search.getNameSpace()
+              && aXAttr.getName().equals(search.getName())) {
+
+            filtered.add(aXAttr);
+            found = true;
+            break;
+          }
+        }
+
+        if (!found) {
+          throw new IOException(
+              "At least one of the attributes provided was not found.");
+        }
+      }
+
+    }
+    return JsonUtil.toJsonString(filtered,
+        new XAttrEncodingParam(encoder).getEncoding());
+  }
+
+  private List<XAttr> getXAttrList(String path) throws IOException {
+    long id = lookup(path);
+    FsImageProto.INodeSection.INode inode = fromINodeId(id);
+    switch (inode.getType()) {
+    case FILE:
+      return FSImageFormatPBINode.Loader.loadXAttrs(
+          inode.getFile().getXAttrs(), stringTable);
+    case DIRECTORY:
+      return FSImageFormatPBINode.Loader.loadXAttrs(inode.getDirectory()
+          .getXAttrs(), stringTable);
+    default:
+      return null;
+    }
+  }
+
+  /**
    * Return the JSON formatted ACL status of the specified file.
    * @param path a path specifies a file
    * @return JSON formatted AclStatus

http://git-wip-us.apache.org/repos/asf/hadoop/blob/44dbddb0/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md
index e3952cd..9b9d80a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md
@@ -98,6 +98,8 @@ The Web processor now supports the following operations:
 * [LISTSTATUS](./WebHDFS.html#List_a_Directory)
 * [GETFILESTATUS](./WebHDFS.html#Status_of_a_FileDirectory)
 * [GETACLSTATUS](./WebHDFS.html#Get_ACL_Status)
+* [GETXATTRS](./WebHDFS.html#Get_an_XAttr)
+* [LISTXATTRS](./WebHDFS.html#List_all_XAttrs)
 
 ### XML Processor
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/44dbddb0/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForXAttr.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForXAttr.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForXAttr.java
new file mode 100644
index 0000000..3f23f64
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForXAttr.java
@@ -0,0 +1,262 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.tools.offlineImageViewer;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.XAttr;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.XAttrHelper;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil;
+import org.apache.hadoop.hdfs.web.JsonUtil;
+import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
+import org.apache.hadoop.net.NetUtils;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+/**
+ * Tests OfflineImageViewer if the input fsimage has XAttributes
+ */
+public class TestOfflineImageViewerForXAttr {
+
+  private static final Log LOG = LogFactory
+      .getLog(TestOfflineImageViewerForXAttr.class);
+
+  private static File originalFsimage = null;
+
+  static String attr1JSon;
+
+  /**
+   * Create a populated namespace for later testing. Save its contents to a data
+   * structure and store its fsimage location. We only want to generate the
+   * fsimage file once and use it for multiple tests.
+   */
+  @BeforeClass
+  public static void createOriginalFSImage() throws IOException {
+    MiniDFSCluster cluster = null;
+    Configuration conf = new Configuration();
+
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).build();
+      cluster.waitActive();
+      DistributedFileSystem hdfs = cluster.getFileSystem();
+      // Create a name space with XAttributes
+      Path dir = new Path("/dir1");
+      hdfs.mkdirs(dir);
+      hdfs.setXAttr(dir, "user.attr1", "value1".getBytes());
+      hdfs.setXAttr(dir, "user.attr2", "value2".getBytes());
+      // Write results to the fsimage file
+      hdfs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER, false);
+      hdfs.saveNamespace();
+
+      List<XAttr> attributes = new ArrayList<XAttr>();
+      attributes.add(XAttrHelper.buildXAttr("user.attr1", "value1".getBytes()));
+
+      attr1JSon = JsonUtil.toJsonString(attributes, null);
+
+      attributes.add(XAttrHelper.buildXAttr("user.attr2", "value2".getBytes()));
+
+      // Determine the location of the fsimage file
+      originalFsimage = FSImageTestUtil.findLatestImageFile(FSImageTestUtil
+          .getFSImage(cluster.getNameNode()).getStorage().getStorageDir(0));
+      if (originalFsimage == null) {
+        throw new RuntimeException("Didn't generate or can't find fsimage");
+      }
+      LOG.debug("original FS image file is " + originalFsimage);
+    } finally {
+      if (cluster != null)
+        cluster.shutdown();
+    }
+  }
+
+  @AfterClass
+  public static void deleteOriginalFSImage() throws IOException {
+    if (originalFsimage != null && originalFsimage.exists()) {
+      originalFsimage.delete();
+    }
+  }
+
+  @Test
+  public void testWebImageViewerForListXAttrs() throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      URL url = new URL("http://localhost:" + port
+          + "/webhdfs/v1/dir1/?op=LISTXATTRS");
+      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_OK, connection.getResponseCode());
+
+      String content = IOUtils.toString(connection.getInputStream());
+
+      assertTrue("Missing user.attr1 in response ",
+          content.contains("user.attr1"));
+      assertTrue("Missing user.attr2 in response ",
+          content.contains("user.attr2"));
+
+    }
+  }
+
+  @Test
+  public void testWebImageViewerForGetXAttrsWithOutParameters()
+      throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      URL url = new URL("http://localhost:" + port
+          + "/webhdfs/v1/dir1/?op=GETXATTRS");
+      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_OK, connection.getResponseCode());
+      String content = IOUtils.toString(connection.getInputStream());
+
+      assertTrue("Missing user.attr1 in response ",
+          content.contains("user.attr1"));
+      assertTrue("Missing user.attr2 in response ",
+          content.contains("user.attr2"));
+    }
+  }
+
+  @Test
+  public void testWebImageViewerForGetXAttrsWithParameters() throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      URL url = new URL("http://localhost:" + port
+          + "/webhdfs/v1/dir1/?op=GETXATTRS&xattr.name=attr8");
+      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_BAD_REQUEST,
+          connection.getResponseCode());
+
+      url = new URL("http://localhost:" + port
+          + "/webhdfs/v1/dir1/?op=GETXATTRS&xattr.name=user.attr1");
+      connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_OK, connection.getResponseCode());
+      String content = IOUtils.toString(connection.getInputStream());
+      assertEquals(attr1JSon, content);
+    }
+  }
+
+  @Test
+  public void testWebImageViewerForGetXAttrsWithCodecParameters()
+      throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      URL url = new URL(
+          "http://localhost:"
+              + port
+              + "/webhdfs/v1/dir1/?op=GETXATTRS&xattr.name=USER.attr1&encoding=TEXT");
+      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_OK, connection.getResponseCode());
+      String content = IOUtils.toString(connection.getInputStream());
+      assertEquals(attr1JSon, content);
+
+    }
+  }
+
+  @Test
+  public void testWithWebHdfsFileSystem() throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      // create a WebHdfsFileSystem instance
+      URI uri = new URI("webhdfs://localhost:" + String.valueOf(port));
+      Configuration conf = new Configuration();
+      WebHdfsFileSystem webhdfs = (WebHdfsFileSystem) FileSystem.get(uri, conf);
+
+      List<String> names = webhdfs.listXAttrs(new Path("/dir1"));
+      assertTrue(names.contains("user.attr1"));
+      assertTrue(names.contains("user.attr2"));
+
+      String value = new String(webhdfs.getXAttr(new Path("/dir1"),
+          "user.attr1"));
+      assertEquals("value1", value);
+
+      Map<String, byte[]> contentMap = webhdfs.getXAttrs(new Path("/dir1"),
+          names);
+
+      assertEquals("value1", new String(contentMap.get("user.attr1")));
+      assertEquals("value2", new String(contentMap.get("user.attr2")));
+    }
+  }
+
+  @Test
+  public void testResponseCode() throws Exception {
+    try (WebImageViewer viewer = new WebImageViewer(
+        NetUtils.createSocketAddr("localhost:0"))) {
+      viewer.initServer(originalFsimage.getAbsolutePath());
+      int port = viewer.getPort();
+
+      URL url = new URL(
+          "http://localhost:"
+              + port
+              + "/webhdfs/v1/dir1/?op=GETXATTRS&xattr.name=user.notpresent&encoding=TEXT");
+      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+      connection.setRequestMethod("GET");
+      connection.connect();
+
+      assertEquals(HttpURLConnection.HTTP_FORBIDDEN,
+          connection.getResponseCode());
+
+    }
+  }
+}


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