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From ste...@apache.org
Subject [40/50] [abbrv] hadoop git commit: HDFS-8630. WebHDFS : Support get/set/unset StoragePolicy. Contributed by Surendra Singh Lilhore.
Date Thu, 08 Dec 2016 22:29:47 GMT
HDFS-8630. WebHDFS : Support get/set/unset StoragePolicy. Contributed by Surendra Singh Lilhore.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/ea2895f4
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/ea2895f4
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/ea2895f4

Branch: refs/heads/HADOOP-13345
Commit: ea2895f4ed5031809d856faa52e9de5b9501bdea
Parents: 72fe546
Author: Andrew Wang <wang@apache.org>
Authored: Wed Dec 7 15:52:16 2016 -0800
Committer: Andrew Wang <wang@apache.org>
Committed: Wed Dec 7 15:52:16 2016 -0800

----------------------------------------------------------------------
 .../apache/hadoop/hdfs/web/JsonUtilClient.java  |  49 ++++
 .../hadoop/hdfs/web/WebHdfsFileSystem.java      |  46 ++++
 .../hadoop/hdfs/web/resources/GetOpParam.java   |   3 +
 .../hadoop/hdfs/web/resources/PostOpParam.java  |   2 +
 .../hadoop/hdfs/web/resources/PutOpParam.java   |   1 +
 .../hdfs/web/resources/StoragePolicyParam.java  |  43 +++
 .../hadoop/fs/http/client/HttpFSFileSystem.java |  92 ++++++-
 .../hadoop/fs/http/server/FSOperations.java     | 130 +++++++++
 .../http/server/HttpFSParametersProvider.java   |  23 ++
 .../hadoop/fs/http/server/HttpFSServer.java     |  35 +++
 .../fs/http/client/BaseTestHttpFSWith.java      |  52 +++-
 .../web/resources/NamenodeWebHdfsMethods.java   |  39 ++-
 .../org/apache/hadoop/hdfs/web/JsonUtil.java    |  27 ++
 .../hadoop-hdfs/src/site/markdown/WebHDFS.md    | 261 +++++++++++++++++++
 .../org/apache/hadoop/hdfs/web/TestWebHDFS.java |  68 +++++
 .../hadoop/hdfs/web/resources/TestParam.java    |   8 +
 16 files changed, 871 insertions(+), 8 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java
index a75f4f1..3690a86 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java
@@ -35,6 +35,7 @@ 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.hdfs.DFSUtilClient;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.DatanodeInfoBuilder;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
@@ -56,6 +57,8 @@ import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -588,4 +591,50 @@ class JsonUtilClient {
         lastLocatedBlock, isLastBlockComplete, null, null);
   }
 
+  public static Collection<BlockStoragePolicy> getStoragePolicies(
+      Map<?, ?> json) {
+    Map<?, ?> policiesJson = (Map<?, ?>) json.get("BlockStoragePolicies");
+    if (policiesJson != null) {
+      List<?> objs = (List<?>) policiesJson.get(BlockStoragePolicy.class
+          .getSimpleName());
+      if (objs != null) {
+        BlockStoragePolicy[] storagePolicies = new BlockStoragePolicy[objs
+            .size()];
+        for (int i = 0; i < objs.size(); i++) {
+          final Map<?, ?> m = (Map<?, ?>) objs.get(i);
+          BlockStoragePolicy blockStoragePolicy = toBlockStoragePolicy(m);
+          storagePolicies[i] = blockStoragePolicy;
+        }
+        return Arrays.asList(storagePolicies);
+      }
+    }
+    return new ArrayList<BlockStoragePolicy>(0);
+  }
+
+  public static BlockStoragePolicy toBlockStoragePolicy(Map<?, ?> m) {
+    byte id = ((Number) m.get("id")).byteValue();
+    String name = (String) m.get("name");
+    StorageType[] storageTypes = toStorageTypes((List<?>) m
+        .get("storageTypes"));
+    StorageType[] creationFallbacks = toStorageTypes((List<?>) m
+        .get("creationFallbacks"));
+    StorageType[] replicationFallbacks = toStorageTypes((List<?>) m
+        .get("replicationFallbacks"));
+    Boolean copyOnCreateFile = (Boolean) m.get("copyOnCreateFile");
+    return new BlockStoragePolicy(id, name, storageTypes, creationFallbacks,
+        replicationFallbacks, copyOnCreateFile.booleanValue());
+  }
+
+  private static StorageType[] toStorageTypes(List<?> list) {
+    if (list == null) {
+      return null;
+    } else {
+      StorageType[] storageTypes = new StorageType[list.size()];
+      for (int i = 0; i < list.size(); i++) {
+        storageTypes[i] = StorageType.parseStorageType((String) list.get(i));
+      }
+      return storageTypes;
+    }
+  }
+
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
index 23804b7..fbb4bd6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
@@ -39,6 +39,7 @@ import java.net.URI;
 import java.net.URL;
 import java.security.PrivilegedExceptionAction;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.List;
@@ -82,6 +83,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.HAUtilClient;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
@@ -1715,6 +1717,50 @@ public class WebHdfsFileSystem extends FileSystem
         : tokenServiceName.toString();
   }
 
+  @Override
+  public void setStoragePolicy(Path p, String policyName) throws IOException {
+    if (policyName == null) {
+      throw new IOException("policyName == null");
+    }
+    statistics.incrementWriteOps(1);
+    storageStatistics.incrementOpCounter(OpType.SET_STORAGE_POLICY);
+    final HttpOpParam.Op op = PutOpParam.Op.SETSTORAGEPOLICY;
+    new FsPathRunner(op, p, new StoragePolicyParam(policyName)).run();
+  }
+
+  @Override
+  public Collection<BlockStoragePolicy> getAllStoragePolicies()
+      throws IOException {
+    final HttpOpParam.Op op = GetOpParam.Op.GETALLSTORAGEPOLICY;
+    return new FsPathResponseRunner<Collection<BlockStoragePolicy>>(op, null) {
+      @Override
+      Collection<BlockStoragePolicy> decodeResponse(Map<?, ?> json)
+          throws IOException {
+        return JsonUtilClient.getStoragePolicies(json);
+      }
+    }.run();
+  }
+
+  @Override
+  public BlockStoragePolicy getStoragePolicy(Path src) throws IOException {
+    final HttpOpParam.Op op = GetOpParam.Op.GETSTORAGEPOLICY;
+    return new FsPathResponseRunner<BlockStoragePolicy>(op, src) {
+      @Override
+      BlockStoragePolicy decodeResponse(Map<?, ?> json) throws IOException {
+        return JsonUtilClient.toBlockStoragePolicy((Map<?, ?>) json
+            .get(BlockStoragePolicy.class.getSimpleName()));
+      }
+    }.run();
+  }
+
+  @Override
+  public void unsetStoragePolicy(Path src) throws IOException {
+    statistics.incrementWriteOps(1);
+    storageStatistics.incrementOpCounter(OpType.UNSET_STORAGE_POLICY);
+    final HttpOpParam.Op op = PostOpParam.Op.UNSETSTORAGEPOLICY;
+    new FsPathRunner(op, src).run();
+  }
+
   @VisibleForTesting
   InetSocketAddress[] getResolvedNNAddr() {
     return nnAddrs;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
index 635e6d7..9169ca8 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
@@ -40,6 +40,9 @@ public class GetOpParam extends HttpOpParam<GetOpParam.Op> {
     GETTRASHROOT(false, HttpURLConnection.HTTP_OK),
     LISTXATTRS(false, HttpURLConnection.HTTP_OK),
 
+    GETALLSTORAGEPOLICY(false, HttpURLConnection.HTTP_OK),
+    GETSTORAGEPOLICY(false, HttpURLConnection.HTTP_OK),
+
     NULL(false, HttpURLConnection.HTTP_NOT_IMPLEMENTED),
 
     CHECKACCESS(false, HttpURLConnection.HTTP_OK),

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PostOpParam.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PostOpParam.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PostOpParam.java
index 4719bf3..56a14c7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PostOpParam.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PostOpParam.java
@@ -29,6 +29,8 @@ public class PostOpParam extends HttpOpParam<PostOpParam.Op> {
 
     TRUNCATE(false, HttpURLConnection.HTTP_OK),
 
+    UNSETSTORAGEPOLICY(false, HttpURLConnection.HTTP_OK),
+
     NULL(false, HttpURLConnection.HTTP_NOT_IMPLEMENTED);
 
     final boolean doOutputAndRedirect;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PutOpParam.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PutOpParam.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PutOpParam.java
index f36f874..4bb48a6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PutOpParam.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/PutOpParam.java
@@ -50,6 +50,7 @@ public class PutOpParam extends HttpOpParam<PutOpParam.Op> {
     DISALLOWSNAPSHOT(false, HttpURLConnection.HTTP_OK),
     CREATESNAPSHOT(false, HttpURLConnection.HTTP_OK),
     RENAMESNAPSHOT(false, HttpURLConnection.HTTP_OK),
+    SETSTORAGEPOLICY(false, HttpURLConnection.HTTP_OK),
 
     NULL(false, HttpURLConnection.HTTP_NOT_IMPLEMENTED);
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/StoragePolicyParam.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/StoragePolicyParam.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/StoragePolicyParam.java
new file mode 100644
index 0000000..60555ee
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/StoragePolicyParam.java
@@ -0,0 +1,43 @@
+/**
+ * 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.web.resources;
+
+/** policy parameter. */
+public class StoragePolicyParam extends StringParam {
+  /** Parameter name. */
+  public static final String NAME = "storagepolicy";
+  /** Default parameter value. */
+  public static final String DEFAULT = "";
+
+  private static final Domain DOMAIN = new Domain(NAME, null);
+
+  /**
+   * Constructor.
+   *
+   * @param str
+   *          a string representation of the parameter value.
+   */
+  public StoragePolicyParam(final String str) {
+    super(DOMAIN, str == null || str.equals(DEFAULT) ? null : str);
+  }
+
+  @Override
+  public String getName() {
+    return NAME;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
index 6cc3909..dad8df2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
@@ -18,6 +18,8 @@
 package org.apache.hadoop.fs.http.client;
 
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.EnumSet;
 import java.util.List;
 
@@ -34,12 +36,14 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PositionedReadable;
 import org.apache.hadoop.fs.Seekable;
+import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.fs.XAttrCodec;
 import org.apache.hadoop.fs.XAttrSetFlag;
 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.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.FsPermissionExtension;
 import org.apache.hadoop.lib.wsrs.EnumSetParam;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -114,6 +118,7 @@ public class HttpFSFileSystem extends FileSystem
   public static final String XATTR_ENCODING_PARAM = "encoding";
   public static final String NEW_LENGTH_PARAM = "newlength";
   public static final String START_AFTER_PARAM = "startAfter";
+  public static final String POLICY_NAME_PARAM = "storagepolicy";
 
   public static final Short DEFAULT_PERMISSION = 0755;
   public static final String ACLSPEC_DEFAULT = "";
@@ -193,6 +198,9 @@ public class HttpFSFileSystem extends FileSystem
   public static final String PARTIAL_LISTING_JSON = "partialListing";
   public static final String REMAINING_ENTRIES_JSON = "remainingEntries";
 
+  public static final String STORAGE_POLICIES_JSON = "BlockStoragePolicies";
+  public static final String STORAGE_POLICY_JSON = "BlockStoragePolicy";
+
   public static final int HTTP_TEMPORARY_REDIRECT = 307;
 
   private static final String HTTP_GET = "GET";
@@ -212,7 +220,9 @@ public class HttpFSFileSystem extends FileSystem
     MODIFYACLENTRIES(HTTP_PUT), REMOVEACLENTRIES(HTTP_PUT),
     REMOVEDEFAULTACL(HTTP_PUT), REMOVEACL(HTTP_PUT), SETACL(HTTP_PUT),
     DELETE(HTTP_DELETE), SETXATTR(HTTP_PUT), GETXATTRS(HTTP_GET),
-    REMOVEXATTR(HTTP_PUT), LISTXATTRS(HTTP_GET), LISTSTATUS_BATCH(HTTP_GET);
+    REMOVEXATTR(HTTP_PUT), LISTXATTRS(HTTP_GET), LISTSTATUS_BATCH(HTTP_GET),
+    GETALLSTORAGEPOLICY(HTTP_GET), GETSTORAGEPOLICY(HTTP_GET),
+    SETSTORAGEPOLICY(HTTP_PUT), UNSETSTORAGEPOLICY(HTTP_POST);
 
     private String httpMethod;
 
@@ -1310,4 +1320,84 @@ public class HttpFSFileSystem extends FileSystem
         params, f, true);
     HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
   }
+
+  @Override
+  public Collection<BlockStoragePolicy> getAllStoragePolicies()
+      throws IOException {
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(OP_PARAM, Operation.GETALLSTORAGEPOLICY.toString());
+    HttpURLConnection conn = getConnection(
+        Operation.GETALLSTORAGEPOLICY.getMethod(), params, new Path(getUri()
+            .toString(), "/"), false);
+    HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
+    JSONObject json = (JSONObject) HttpFSUtils.jsonParse(conn);
+    return createStoragePolicies((JSONObject) json.get(STORAGE_POLICIES_JSON));
+  }
+
+  private Collection<BlockStoragePolicy> createStoragePolicies(JSONObject map)
+      throws IOException {
+    JSONArray jsonArray = (JSONArray) map.get(STORAGE_POLICY_JSON);
+    BlockStoragePolicy[] policies = new BlockStoragePolicy[jsonArray.size()];
+    for (int i = 0; i < jsonArray.size(); i++) {
+      policies[i] = createStoragePolicy((JSONObject) jsonArray.get(i));
+    }
+    return Arrays.asList(policies);
+  }
+
+  @Override
+  public BlockStoragePolicy getStoragePolicy(Path src) throws IOException {
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(OP_PARAM, Operation.GETSTORAGEPOLICY.toString());
+    HttpURLConnection conn = getConnection(
+        Operation.GETSTORAGEPOLICY.getMethod(), params, src, true);
+    HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
+    JSONObject json = (JSONObject) HttpFSUtils.jsonParse(conn);
+    return createStoragePolicy((JSONObject) json.get(STORAGE_POLICY_JSON));
+  }
+
+  private BlockStoragePolicy createStoragePolicy(JSONObject policyJson)
+      throws IOException {
+    byte id = ((Number) policyJson.get("id")).byteValue();
+    String name = (String) policyJson.get("name");
+    StorageType[] storageTypes = toStorageTypes((JSONArray) policyJson
+        .get("storageTypes"));
+    StorageType[] creationFallbacks = toStorageTypes((JSONArray) policyJson
+        .get("creationFallbacks"));
+    StorageType[] replicationFallbacks = toStorageTypes((JSONArray) policyJson
+        .get("replicationFallbacks"));
+    Boolean copyOnCreateFile = (Boolean) policyJson.get("copyOnCreateFile");
+    return new BlockStoragePolicy(id, name, storageTypes, creationFallbacks,
+        replicationFallbacks, copyOnCreateFile.booleanValue());
+  }
+
+  private StorageType[] toStorageTypes(JSONArray array) throws IOException {
+    if (array == null) {
+      return null;
+    } else {
+      List<StorageType> storageTypes = new ArrayList<StorageType>(array.size());
+      for (Object name : array) {
+        storageTypes.add(StorageType.parseStorageType((String) name));
+      }
+      return storageTypes.toArray(new StorageType[storageTypes.size()]);
+    }
+  }
+
+  @Override
+  public void setStoragePolicy(Path src, String policyName) throws IOException {
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(OP_PARAM, Operation.SETSTORAGEPOLICY.toString());
+    params.put(POLICY_NAME_PARAM, policyName);
+    HttpURLConnection conn = getConnection(
+        Operation.SETSTORAGEPOLICY.getMethod(), params, src, true);
+    HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
+  }
+
+  @Override
+  public void unsetStoragePolicy(Path src) throws IOException {
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(OP_PARAM, Operation.UNSETSTORAGEPOLICY.toString());
+    HttpURLConnection conn = getConnection(
+        Operation.UNSETSTORAGEPOLICY.getMethod(), params, src, true);
+    HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java
index ebdb73e..6de7012 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java
@@ -18,6 +18,7 @@
 package org.apache.hadoop.fs.http.server;
 
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.fs.BlockStoragePolicySpi;
 import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.FileChecksum;
 import org.apache.hadoop.fs.FileStatus;
@@ -26,12 +27,14 @@ import org.apache.hadoop.fs.FilterFileSystem;
 import org.apache.hadoop.fs.GlobFilter;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PathFilter;
+import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.fs.XAttrCodec;
 import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
 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.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.lib.service.FileSystemAccess;
 import org.apache.hadoop.util.StringUtils;
@@ -42,6 +45,7 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.Collection;
 import java.util.EnumSet;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -260,6 +264,46 @@ public class FSOperations {
     return json;
   }
 
+  @SuppressWarnings({ "unchecked" })
+  private static JSONObject storagePolicyToJSON(BlockStoragePolicySpi policy) {
+    BlockStoragePolicy p = (BlockStoragePolicy) policy;
+    JSONObject policyJson = new JSONObject();
+    policyJson.put("id", p.getId());
+    policyJson.put("name", p.getName());
+    policyJson.put("storageTypes", toJsonArray(p.getStorageTypes()));
+    policyJson.put("creationFallbacks", toJsonArray(p.getCreationFallbacks()));
+    policyJson.put("replicationFallbacks",
+        toJsonArray(p.getReplicationFallbacks()));
+    policyJson.put("copyOnCreateFile", p.isCopyOnCreateFile());
+    return policyJson;
+  }
+
+  @SuppressWarnings("unchecked")
+  private static JSONArray toJsonArray(StorageType[] storageTypes) {
+    JSONArray jsonArray = new JSONArray();
+    for (StorageType type : storageTypes) {
+      jsonArray.add(type.toString());
+    }
+    return jsonArray;
+  }
+
+  @SuppressWarnings("unchecked")
+  private static JSONObject storagePoliciesToJSON(
+      Collection<? extends BlockStoragePolicySpi> storagePolicies) {
+    JSONObject json = new JSONObject();
+    JSONArray jsonArray = new JSONArray();
+    JSONObject policies = new JSONObject();
+    if (storagePolicies != null) {
+      for (BlockStoragePolicySpi policy : storagePolicies) {
+        JSONObject policyMap = storagePolicyToJSON(policy);
+        jsonArray.add(policyMap);
+      }
+    }
+    policies.put(HttpFSFileSystem.STORAGE_POLICY_JSON, jsonArray);
+    json.put(HttpFSFileSystem.STORAGE_POLICIES_JSON, policies);
+    return json;
+  }
+
   /**
    * Executor that performs an append FileSystemAccess files system operation.
    */
@@ -1319,4 +1363,90 @@ public class FSOperations {
       return xAttrsToJSON(xattrs, encoding);
     }
   }
+
+  /**
+   * Executor that performs a getAllStoragePolicies FileSystemAccess files
+   * system operation.
+   */
+  @SuppressWarnings({ "unchecked" })
+  @InterfaceAudience.Private
+  public static class FSGetAllStoragePolicies implements
+      FileSystemAccess.FileSystemExecutor<JSONObject> {
+
+    @Override
+    public JSONObject execute(FileSystem fs) throws IOException {
+      Collection<? extends BlockStoragePolicySpi> storagePolicies = fs
+          .getAllStoragePolicies();
+      return storagePoliciesToJSON(storagePolicies);
+    }
+  }
+
+  /**
+   * Executor that performs a getStoragePolicy FileSystemAccess files system
+   * operation.
+   */
+  @SuppressWarnings({ "unchecked" })
+  @InterfaceAudience.Private
+  public static class FSGetStoragePolicy implements
+      FileSystemAccess.FileSystemExecutor<JSONObject> {
+
+    private Path path;
+
+    public FSGetStoragePolicy(String path) {
+      this.path = new Path(path);
+    }
+
+    @Override
+    public JSONObject execute(FileSystem fs) throws IOException {
+      BlockStoragePolicySpi storagePolicy = fs.getStoragePolicy(path);
+      JSONObject json = new JSONObject();
+      json.put(HttpFSFileSystem.STORAGE_POLICY_JSON,
+          storagePolicyToJSON(storagePolicy));
+      return json;
+    }
+  }
+
+  /**
+   * Executor that performs a setStoragePolicy FileSystemAccess files system
+   * operation.
+   */
+  @InterfaceAudience.Private
+  public static class FSSetStoragePolicy implements
+      FileSystemAccess.FileSystemExecutor<Void> {
+
+    private Path path;
+    private String policyName;
+
+    public FSSetStoragePolicy(String path, String policyName) {
+      this.path = new Path(path);
+      this.policyName = policyName;
+    }
+
+    @Override
+    public Void execute(FileSystem fs) throws IOException {
+      fs.setStoragePolicy(path, policyName);
+      return null;
+    }
+  }
+
+  /**
+   * Executor that performs a unsetStoragePolicy FileSystemAccess files system
+   * operation.
+   */
+  @InterfaceAudience.Private
+  public static class FSUnsetStoragePolicy implements
+      FileSystemAccess.FileSystemExecutor<Void> {
+
+    private Path path;
+
+    public FSUnsetStoragePolicy(String path) {
+      this.path = new Path(path);
+    }
+
+    @Override
+    public Void execute(FileSystem fs) throws IOException {
+      fs.unsetStoragePolicy(path);
+      return null;
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSParametersProvider.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSParametersProvider.java b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSParametersProvider.java
index 9e89405..a9d350a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSParametersProvider.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSParametersProvider.java
@@ -94,6 +94,11 @@ public class HttpFSParametersProvider extends ParametersProvider {
     PARAMS_DEF.put(Operation.LISTXATTRS, new Class[]{});
     PARAMS_DEF.put(Operation.LISTSTATUS_BATCH,
         new Class[]{StartAfterParam.class});
+    PARAMS_DEF.put(Operation.GETALLSTORAGEPOLICY, new Class[] {});
+    PARAMS_DEF.put(Operation.GETSTORAGEPOLICY, new Class[] {});
+    PARAMS_DEF.put(Operation.SETSTORAGEPOLICY,
+        new Class[] {PolicyNameParam.class});
+    PARAMS_DEF.put(Operation.UNSETSTORAGEPOLICY, new Class[] {});
   }
 
   public HttpFSParametersProvider() {
@@ -541,4 +546,22 @@ public class HttpFSParametersProvider extends ParametersProvider {
       super(NAME, null);
     }
   }
+
+  /**
+   * Class for policyName parameter.
+   */
+  @InterfaceAudience.Private
+  public static class PolicyNameParam extends StringParam {
+    /**
+     * Parameter name.
+     */
+    public static final String NAME = HttpFSFileSystem.POLICY_NAME_PARAM;
+
+    /**
+     * Constructor.
+     */
+    public PolicyNameParam() {
+      super(NAME, null);
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java
index 3d81ac2..f526053 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java
@@ -41,6 +41,7 @@ import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.OperationParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.OverwriteParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.OwnerParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.PermissionParam;
+import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.PolicyNameParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.RecursiveParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.ReplicationParam;
 import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.SourcesParam;
@@ -346,6 +347,22 @@ public class HttpFSServer {
       response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
       break;
     }
+    case GETALLSTORAGEPOLICY: {
+      FSOperations.FSGetAllStoragePolicies command =
+          new FSOperations.FSGetAllStoragePolicies();
+      JSONObject json = fsExecute(user, command);
+      AUDIT_LOG.info("[{}]", path);
+      response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
+      break;
+    }
+    case GETSTORAGEPOLICY: {
+      FSOperations.FSGetStoragePolicy command =
+          new FSOperations.FSGetStoragePolicy(path);
+      JSONObject json = fsExecute(user, command);
+      AUDIT_LOG.info("[{}]", path);
+      response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
+      break;
+    }
     default: {
       throw new IOException(
           MessageFormat.format("Invalid HTTP GET operation [{0}]", op.value()));
@@ -473,6 +490,14 @@ public class HttpFSServer {
         response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
         break;
       }
+      case UNSETSTORAGEPOLICY: {
+        FSOperations.FSUnsetStoragePolicy command =
+             new FSOperations.FSUnsetStoragePolicy(path);
+         fsExecute(user, command);
+         AUDIT_LOG.info("Unset storage policy [{}]", path);
+         response = Response.ok().build();
+         break;
+      }
       default: {
         throw new IOException(
           MessageFormat.format("Invalid HTTP POST operation [{0}]",
@@ -690,6 +715,16 @@ public class HttpFSServer {
         response = Response.ok().build();
         break;
       }
+      case SETSTORAGEPOLICY: {
+        String policyName = params.get(PolicyNameParam.NAME,
+            PolicyNameParam.class);
+        FSOperations.FSSetStoragePolicy command =
+            new FSOperations.FSSetStoragePolicy(path, policyName);
+        fsExecute(user, command);
+        AUDIT_LOG.info("[{}] to policy [{}]", path, policyName);
+        response = Response.ok().build();
+        break;
+      }
       default: {
         throw new IOException(
           MessageFormat.format("Invalid HTTP PUT operation [{0}]",

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java
index e130c68..2d86794 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java
@@ -19,6 +19,7 @@
 package org.apache.hadoop.fs.http.client;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.BlockStoragePolicySpi;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.FileChecksum;
@@ -35,6 +36,8 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.AppendTestUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.test.HFSTestCase;
 import org.apache.hadoop.test.HadoopUsersConfTestHelper;
@@ -941,12 +944,56 @@ public abstract class BaseTestHttpFSWith extends HFSTestCase {
     assertFalse(httpStatus.isEncrypted());
   }
 
+  private void testStoragePolicy() throws Exception {
+    Assume.assumeFalse("Assume its not a local FS", isLocalFS());
+    FileSystem fs = FileSystem.get(getProxiedFSConf());
+    fs.mkdirs(getProxiedFSTestDir());
+    Path path = new Path(getProxiedFSTestDir(), "policy.txt");
+    FileSystem httpfs = getHttpFSFileSystem();
+    // test getAllStoragePolicies
+    BlockStoragePolicy[] dfsPolicies = (BlockStoragePolicy[]) fs
+       .getAllStoragePolicies().toArray();
+    BlockStoragePolicy[] httpPolicies = (BlockStoragePolicy[]) httpfs
+        .getAllStoragePolicies().toArray();
+    Assert.assertArrayEquals(
+        "Policy array returned from the DFS and HttpFS should be equals",
+        dfsPolicies, httpPolicies);
+
+    // test get/set/unset policies
+    DFSTestUtil.createFile(fs, path, 0, (short) 1, 0L);
+    // get defaultPolicy
+   BlockStoragePolicySpi defaultdfsPolicy = fs.getStoragePolicy(path);
+    // set policy through webhdfs
+    httpfs.setStoragePolicy(path, HdfsConstants.COLD_STORAGE_POLICY_NAME);
+    // get policy from dfs
+    BlockStoragePolicySpi dfsPolicy = fs.getStoragePolicy(path);
+    // get policy from webhdfs
+    BlockStoragePolicySpi httpFsPolicy = httpfs.getStoragePolicy(path);
+    Assert
+       .assertEquals(
+            "Storage policy returned from the get API should"
+            + " be same as set policy",
+            HdfsConstants.COLD_STORAGE_POLICY_NAME.toString(),
+            httpFsPolicy.getName());
+    Assert.assertEquals(
+        "Storage policy returned from the DFS and HttpFS should be equals",
+        httpFsPolicy, dfsPolicy);
+    // unset policy
+    httpfs.unsetStoragePolicy(path);
+    Assert
+       .assertEquals(
+            "After unset storage policy, the get API shoudld"
+            + " return the default policy",
+            defaultdfsPolicy, httpfs.getStoragePolicy(path));
+    fs.close();
+  }
+
   protected enum Operation {
     GET, OPEN, CREATE, APPEND, TRUNCATE, CONCAT, RENAME, DELETE, LIST_STATUS, 
     WORKING_DIRECTORY, MKDIRS, SET_TIMES, SET_PERMISSION, SET_OWNER, 
     SET_REPLICATION, CHECKSUM, CONTENT_SUMMARY, FILEACLS, DIRACLS, SET_XATTR,
     GET_XATTRS, REMOVE_XATTR, LIST_XATTRS, ENCRYPTION, LIST_STATUS_BATCH,
-    GETTRASHROOT
+    GETTRASHROOT, STORAGEPOLICY
   }
 
   private void operation(Operation op) throws Exception {
@@ -1029,6 +1076,9 @@ public abstract class BaseTestHttpFSWith extends HFSTestCase {
     case GETTRASHROOT:
       testTrashRoot();
       break;
+    case STORAGEPOLICY:
+      testStoragePolicy();
+      break;
     }
   }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
index 5d9b12a..e400847 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
@@ -66,6 +66,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.XAttrHelper;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
@@ -414,14 +415,16 @@ public class NamenodeWebHdfsMethods {
       @QueryParam(CreateFlagParam.NAME) @DefaultValue(CreateFlagParam.DEFAULT)
           final CreateFlagParam createFlagParam,
       @QueryParam(NoRedirectParam.NAME) @DefaultValue(NoRedirectParam.DEFAULT)
-          final NoRedirectParam noredirect
+          final NoRedirectParam noredirect,
+      @QueryParam(StoragePolicyParam.NAME) @DefaultValue(StoragePolicyParam
+          .DEFAULT) final StoragePolicyParam policyName
       ) throws IOException, InterruptedException {
     return put(ugi, delegation, username, doAsUser, ROOT, op, destination,
         owner, group, permission, unmaskedPermission, overwrite, bufferSize,
         replication, blockSize, modificationTime, accessTime, renameOptions,
         createParent, delegationTokenArgument, aclPermission, xattrName,
         xattrValue, xattrSetFlag, snapshotName, oldSnapshotName,
-        excludeDatanodes, createFlagParam, noredirect);
+        excludeDatanodes, createFlagParam, noredirect, policyName);
   }
 
   /** Validate all required params. */
@@ -499,7 +502,9 @@ public class NamenodeWebHdfsMethods {
       @QueryParam(CreateFlagParam.NAME) @DefaultValue(CreateFlagParam.DEFAULT)
           final CreateFlagParam createFlagParam,
       @QueryParam(NoRedirectParam.NAME) @DefaultValue(NoRedirectParam.DEFAULT)
-          final NoRedirectParam noredirect
+          final NoRedirectParam noredirect,
+      @QueryParam(StoragePolicyParam.NAME) @DefaultValue(StoragePolicyParam
+          .DEFAULT) final StoragePolicyParam policyName
       ) throws IOException, InterruptedException {
 
     init(ugi, delegation, username, doAsUser, path, op, destination, owner,
@@ -507,7 +512,7 @@ public class NamenodeWebHdfsMethods {
         replication, blockSize, modificationTime, accessTime, renameOptions,
         delegationTokenArgument, aclPermission, xattrName, xattrValue,
         xattrSetFlag, snapshotName, oldSnapshotName, excludeDatanodes,
-        createFlagParam, noredirect);
+        createFlagParam, noredirect, policyName);
 
     return doAs(ugi, new PrivilegedExceptionAction<Response>() {
       @Override
@@ -519,7 +524,7 @@ public class NamenodeWebHdfsMethods {
               renameOptions, createParent, delegationTokenArgument,
               aclPermission, xattrName, xattrValue, xattrSetFlag,
               snapshotName, oldSnapshotName, excludeDatanodes,
-              createFlagParam, noredirect);
+              createFlagParam, noredirect, policyName);
       }
     });
   }
@@ -553,7 +558,8 @@ public class NamenodeWebHdfsMethods {
       final OldSnapshotNameParam oldSnapshotName,
       final ExcludeDatanodesParam exclDatanodes,
       final CreateFlagParam createFlagParam,
-      final NoRedirectParam noredirectParam
+      final NoRedirectParam noredirectParam,
+      final StoragePolicyParam policyName
       ) throws IOException, URISyntaxException {
 
     final Configuration conf = (Configuration)context.getAttribute(JspHelper.CURRENT_CONF);
@@ -706,6 +712,13 @@ public class NamenodeWebHdfsMethods {
       np.disallowSnapshot(fullpath);
       return Response.ok().type(MediaType.APPLICATION_OCTET_STREAM).build();
     }
+    case SETSTORAGEPOLICY: {
+      if (policyName.getValue() == null) {
+        throw new IllegalArgumentException("Storage policy name is empty.");
+      }
+      np.setStoragePolicy(fullpath, policyName.getValue());
+      return Response.ok().type(MediaType.APPLICATION_OCTET_STREAM).build();
+    }
     default:
       throw new UnsupportedOperationException(op + " is not supported");
     }
@@ -829,6 +842,10 @@ public class NamenodeWebHdfsMethods {
       final String js = JsonUtil.toJsonString("boolean", b);
       return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
     }
+    case UNSETSTORAGEPOLICY: {
+      np.unsetStoragePolicy(fullpath);
+      return Response.ok().build();
+    }
     default:
       throw new UnsupportedOperationException(op + " is not supported");
     }
@@ -1094,6 +1111,16 @@ public class NamenodeWebHdfsMethods {
       final String js = JsonUtil.toJsonString(listing);
       return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
     }
+    case GETALLSTORAGEPOLICY: {
+      BlockStoragePolicy[] storagePolicies = np.getStoragePolicies();
+      final String js = JsonUtil.toJsonString(storagePolicies);
+      return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
+    }
+    case GETSTORAGEPOLICY: {
+      BlockStoragePolicy storagePolicy = np.getStoragePolicy(fullpath);
+      final String js = JsonUtil.toJsonString(storagePolicy);
+      return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
+    }
     default:
       throw new UnsupportedOperationException(op + " is not supported");
     }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
index a0dadbd..05a5777 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
@@ -436,4 +436,31 @@ public class JsonUtil {
     return MAPPER.writeValueAsString(obj);
   }
 
+  public static String toJsonString(BlockStoragePolicy[] storagePolicies) {
+    final Map<String, Object> blockStoragePolicies = new TreeMap<>();
+    Object[] a = null;
+    if (storagePolicies != null && storagePolicies.length > 0) {
+      a = new Object[storagePolicies.length];
+      for (int i = 0; i < storagePolicies.length; i++) {
+        a[i] = toJsonMap(storagePolicies[i]);
+      }
+    }
+    blockStoragePolicies.put("BlockStoragePolicy", a);
+    return toJsonString("BlockStoragePolicies", blockStoragePolicies);
+  }
+
+  private static Object toJsonMap(BlockStoragePolicy blockStoragePolicy) {
+    final Map<String, Object> m = new TreeMap<String, Object>();
+    m.put("id", blockStoragePolicy.getId());
+    m.put("name", blockStoragePolicy.getName());
+    m.put("storageTypes", blockStoragePolicy.getStorageTypes());
+    m.put("creationFallbacks", blockStoragePolicy.getCreationFallbacks());
+    m.put("replicationFallbacks", blockStoragePolicy.getReplicationFallbacks());
+    m.put("copyOnCreateFile", blockStoragePolicy.isCopyOnCreateFile());
+    return m;
+  }
+
+  public static String toJsonString(BlockStoragePolicy storagePolicy) {
+    return toJsonString(BlockStoragePolicy.class, toJsonMap(storagePolicy));
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
index eda1350..f91e89f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
@@ -54,6 +54,10 @@ WebHDFS REST API
         * [Set ACL](#Set_ACL)
         * [Get ACL Status](#Get_ACL_Status)
         * [Check access](#Check_access)
+        * [Get all Storage Policies](#Get_all_Storage_Policies)
+        * [Set Storage Policy](#Set_Storage_Policy)
+        * [Unset Storage Policy](#Unset_Storage_Policy)
+        * [Get Storage Policy](#Get_Storage_Policy)
     * [Extended Attributes(XAttrs) Operations](#Extended_AttributesXAttrs_Operations)
         * [Set XAttr](#Set_XAttr)
         * [Remove XAttr](#Remove_XAttr)
@@ -90,6 +94,9 @@ WebHDFS REST API
         * [RemoteException JSON Schema](#RemoteException_JSON_Schema)
         * [Token JSON Schema](#Token_JSON_Schema)
             * [Token Properties](#Token_Properties)
+        * [BlockStoragePolicy JSON Schema](#BlockStoragePolicy_JSON_Schema)
+            * [BlockStoragePolicy Properties](#BlockStoragePolicy_Properties)
+        * [BlockStoragePolicies JSON Schema](#BlockStoragePolicies_JSON_Schema)
     * [HTTP Query Parameter Dictionary](#HTTP_Query_Parameter_Dictionary)
         * [ACL Spec](#ACL_Spec)
         * [XAttr Name](#XAttr_Name)
@@ -124,6 +131,8 @@ WebHDFS REST API
         * [Token Service](#Token_Service)
         * [Username](#Username)
         * [NoRedirect](#NoRedirect)
+        * [Storage Policy](#Storage_Policy)
+        * [Start After](#Start_After)
 
 Document Conventions
 --------------------
@@ -156,6 +165,8 @@ The HTTP REST API supports the complete [FileSystem](../../api/org/apache/hadoop
     * [`GETXATTRS`](#Get_all_XAttrs) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getXAttrs)
     * [`LISTXATTRS`](#List_all_XAttrs) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).listXAttrs)
     * [`CHECKACCESS`](#Check_access) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).access)
+    * [`GETALLSTORAGEPOLICY`](#Get_all_Storage_Policies) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getAllStoragePolicies)
+    * [`GETSTORAGEPOLICY`](#Get_Storage_Policy) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getStoragePolicy)
 *   HTTP PUT
     * [`CREATE`](#Create_and_Write_to_a_File) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).create)
     * [`MKDIRS`](#Make_a_Directory) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).mkdirs)
@@ -171,10 +182,12 @@ The HTTP REST API supports the complete [FileSystem](../../api/org/apache/hadoop
     * [`RENAMESNAPSHOT`](#Rename_Snapshot) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).renameSnapshot)
     * [`SETXATTR`](#Set_XAttr) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).setXAttr)
     * [`REMOVEXATTR`](#Remove_XAttr) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).removeXAttr)
+    * [`SETSTORAGEPOLICY`](#Set_Storage_Policy) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).setStoragePolicy)
 *   HTTP POST
     * [`APPEND`](#Append_to_a_File) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).append)
     * [`CONCAT`](#Concat_Files) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).concat)
     * [`TRUNCATE`](#Truncate_a_File) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).truncate)
+    * [`UNSETSTORAGEPOLICY`](#Unset_Storage_Policy) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).unsetStoragePolicy)
 *   HTTP DELETE
     * [`DELETE`](#Delete_a_FileDirectory) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).delete)
     * [`DELETESNAPSHOT`](#Delete_Snapshot) (see [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).deleteSnapshot)
@@ -1015,6 +1028,129 @@ See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getAclSta
 
 See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).access
 
+Storage Policy Operations
+-------------------------
+
+### Get all Storage Policies
+
+* Submit a HTTP GET request.
+
+        curl -i "http://<HOST>:<PORT>/webhdfs/v1?op=GETALLSTORAGEPOLICY"
+
+    The client receives a response with a [`BlockStoragePolicies` JSON object](#BlockStoragePolicies_JSON_Schema):
+
+        HTTP/1.1 200 OK
+        Content-Type: application/json
+        Transfer-Encoding: chunked
+
+        {
+            "BlockStoragePolicies": {
+                "BlockStoragePolicy": [
+                   {
+                       "copyOnCreateFile": false,
+                       "creationFallbacks": [],
+                       "id": 2,
+                       "name": "COLD",
+                       "replicationFallbacks": [],
+                       "storageTypes": ["ARCHIVE"]
+                   },
+                   {
+                       "copyOnCreateFile": false,
+                       "creationFallbacks": ["DISK","ARCHIVE"],
+                       "id": 5,
+                       "name": "WARM",
+                       "replicationFallbacks": ["DISK","ARCHIVE"],
+                       "storageTypes": ["DISK","ARCHIVE"]
+                   },
+                   {
+                       "copyOnCreateFile": false,
+                       "creationFallbacks": [],
+                       "id": 7,
+                       "name": "HOT",
+                       "replicationFallbacks": ["ARCHIVE"],
+                       "storageTypes": ["DISK"]
+                   },
+                   {
+                       "copyOnCreateFile": false,
+                       "creationFallbacks": ["SSD","DISK"],
+                       "id": 10,"name": "ONE_SSD",
+                       "replicationFallbacks": ["SSD","DISK"],
+                       "storageTypes": ["SSD","DISK"]
+                   },
+                   {
+                       "copyOnCreateFile": false,
+                       "creationFallbacks": ["DISK"],
+                       "id": 12,
+                       "name": "ALL_SSD",
+                       "replicationFallbacks": ["DISK"],
+                       "storageTypes": ["SSD"]
+                   },
+                   {
+                       "copyOnCreateFile": true,
+                       "creationFallbacks": ["DISK"],
+                       "id": 15,
+                       "name": "LAZY_PERSIST",
+                       "replicationFallbacks": ["DISK"],
+                       "storageTypes": ["RAM_DISK","DISK"]
+                   }
+               ]
+           }
+        }
+
+See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getAllStoragePolicies
+
+### Set Storage Policy
+
+* Submit a HTTP PUT request.
+
+        curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=SETSTORAGEPOLICY
+                                      &storagepolicy=<policy>"
+
+    The client receives a response with zero content length:
+
+        HTTP/1.1 200 OK
+        Content-Length: 0
+
+See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).setStoragePolicy
+
+### Unset Storage Policy
+
+* Submit a HTTP POT request.
+
+        curl -i -X POST "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=UNSETSTORAGEPOLICY"
+
+    The client receives a response with zero content length:
+
+        HTTP/1.1 200 OK
+        Content-Length: 0
+
+See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).unsetStoragePolicy
+
+### Get Storage Policy
+
+* Submit a HTTP GET request.
+
+        curl -i "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETSTORAGEPOLICY"
+
+    The client receives a response with a [`BlockStoragePolicy` JSON object](#BlockStoragePolicy_JSON_Schema):
+
+        HTTP/1.1 200 OK
+        Content-Type: application/json
+        Transfer-Encoding: chunked
+
+        {
+            "BlockStoragePolicy": {
+                "copyOnCreateFile": false,
+               "creationFallbacks": [],
+                "id":7,
+                "name":"HOT",
+                "replicationFallbacks":["ARCHIVE"],
+                "storageTypes":["DISK"]
+            }
+        }
+
+See also: [FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getStoragePolicy
+
 Extended Attributes(XAttrs) Operations
 --------------------------------------
 
@@ -1871,6 +2007,107 @@ var tokenProperties =
 ```
 
 See also: [`Token` Properties](#Token_Properties), the note in [Delegation](#Delegation).
+### BlockStoragePolicy JSON Schema
+
+```json
+{
+  "name"      : "BlockStoragePolicy",
+  "properties":
+  {
+    "BlockStoragePolicy": blockStoragePolicyProperties      //See BlockStoragePolicy Properties
+  }
+}
+```
+
+See also: [`BlockStoragePolicy` Properties](#BlockStoragePolicy_Properties), [`GETSTORAGEPOLICY`](#Get_Storage_Policy)
+
+#### BlockStoragePolicy Properties
+
+JavaScript syntax is used to define `blockStoragePolicyProperties` so that it can be referred in both `BlockStoragePolicy` and `BlockStoragePolicies` JSON schemas.
+
+```javascript
+var blockStoragePolicyProperties =
+{
+  "type"      : "object",
+  "properties":
+  {
+    "id":
+    {
+      "description": "Policy ID.",
+      "type"       : "integer",
+      "required"   : true
+    },
+    "name":
+    {
+      "description": "Policy name.",
+      "type"       : "string",
+      "required"   : true
+    },
+    "storageTypes":
+    {
+      "description": "An array of storage types for block placement.",
+      "type"       : "array",
+      "required"   : true
+      "items"      :
+      {
+        "type": "string"
+      }
+    },
+    "replicationFallbacks":
+    {
+      "description": "An array of fallback storage types for replication.",
+      "type"       : "array",
+      "required"   : true
+      "items"      :
+      {
+        "type": "string"
+      }
+    },
+    "creationFallbacks":
+    {
+      "description": "An array of fallback storage types for file creation.",
+      "type"       : "array",
+      "required"   : true
+      "items"      :
+      {
+       "type": "string"
+      }
+    },
+    "copyOnCreateFile":
+    {
+      "description": "If set then the policy cannot be changed after file creation.",
+      "type"       : "boolean",
+      "required"   : true
+    }
+  }
+};
+```
+
+### BlockStoragePolicies JSON Schema
+
+A `BlockStoragePolicies` JSON object represents an array of `BlockStoragePolicy` JSON objects.
+
+```json
+{
+  "name"      : "BlockStoragePolicies",
+  "properties":
+  {
+    "BlockStoragePolicies":
+    {
+      "type"      : "object",
+      "properties":
+      {
+        "BlockStoragePolicy":
+        {
+          "description": "An array of BlockStoragePolicy",
+          "type"       : "array",
+          "items"      : blockStoragePolicyProperties      //See BlockStoragePolicy Properties
+        }
+      }
+    }
+  }
+}
+```
 
 HTTP Query Parameter Dictionary
 -------------------------------
@@ -2281,3 +2518,27 @@ See also: [Authentication](#Authentication)
 | Syntax | true |
 
 See also: [Create and Write to a File](#Create_and_Write_to_a_File)
+
+### Storage Policy
+
+| Name | `storagepolicy` |
+|:---- |:---- |
+| Description | The name of the storage policy. |
+| Type | String |
+| Default Value | \<empty\> |
+| Valid Values | Any valid storage policy name; see [GETALLSTORAGEPOLICY](#Get_all_Storage_Policies).  |
+| Syntax | Any string. |
+
+See also: [`SETSTORAGEPOLICY`](#Set_Storage_Policy)
+
+### Start After
+
+| Name | `startAfter` |
+|:---- |:---- |
+| Description | The last item returned in the liststatus batch. |
+| Type | String |
+| Default Value | \<empty\> |
+| Valid Values | Any valid file/directory name. |
+| Syntax | Any string. |
+
+See also: [`LISTSTATUS_BATCH`](#Iteratively_List_a_Directory)

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
index 5386a45..259353c 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
@@ -37,6 +37,7 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.security.PrivilegedExceptionAction;
+import java.util.Arrays;
 import java.util.Random;
 
 import org.apache.commons.io.IOUtils;
@@ -44,6 +45,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.BlockLocation;
+import org.apache.hadoop.fs.BlockStoragePolicySpi;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.FSDataInputStream;
@@ -58,10 +60,13 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.TestDFSClientRetries;
 import org.apache.hadoop.hdfs.TestFileCreation;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
@@ -1113,4 +1118,67 @@ public class TestWebHDFS {
       }
     }
   }
+
+
+  @Test
+  public void testStoragePolicy() throws Exception {
+    MiniDFSCluster cluster = null;
+    final Configuration conf = WebHdfsTestUtil.createConf();
+    final Path path = new Path("/file");
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      final DistributedFileSystem dfs = cluster.getFileSystem();
+      final WebHdfsFileSystem webHdfs = WebHdfsTestUtil.getWebHdfsFileSystem(
+          conf, WebHdfsConstants.WEBHDFS_SCHEME);
+
+      // test getAllStoragePolicies
+      BlockStoragePolicy[] dfsPolicies = (BlockStoragePolicy[]) dfs
+          .getAllStoragePolicies().toArray();
+      BlockStoragePolicy[] webHdfsPolicies = (BlockStoragePolicy[]) webHdfs
+          .getAllStoragePolicies().toArray();
+      Assert.assertTrue(Arrays.equals(dfsPolicies, webHdfsPolicies));
+
+      // test get/set/unset policies
+      DFSTestUtil.createFile(dfs, path, 0, (short) 1, 0L);
+      // get defaultPolicy
+      BlockStoragePolicySpi defaultdfsPolicy = dfs.getStoragePolicy(path);
+      // set policy through webhdfs
+      webHdfs.setStoragePolicy(path, HdfsConstants.COLD_STORAGE_POLICY_NAME);
+      // get policy from dfs
+      BlockStoragePolicySpi dfsPolicy = dfs.getStoragePolicy(path);
+      // get policy from webhdfs
+      BlockStoragePolicySpi webHdfsPolicy = webHdfs.getStoragePolicy(path);
+      Assert.assertEquals(HdfsConstants.COLD_STORAGE_POLICY_NAME.toString(),
+          webHdfsPolicy.getName());
+      Assert.assertEquals(webHdfsPolicy, dfsPolicy);
+      // unset policy
+      webHdfs.unsetStoragePolicy(path);
+      Assert.assertEquals(defaultdfsPolicy, webHdfs.getStoragePolicy(path));
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  @Test
+  public void testSetStoragePolicyWhenPolicyDisabled() throws Exception {
+    Configuration conf = new HdfsConfiguration();
+    conf.setBoolean(DFSConfigKeys.DFS_STORAGE_POLICY_ENABLED_KEY, false);
+    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
+        .build();
+    try {
+      cluster.waitActive();
+      final WebHdfsFileSystem webHdfs = WebHdfsTestUtil.getWebHdfsFileSystem(
+          conf, WebHdfsConstants.WEBHDFS_SCHEME);
+      webHdfs.setStoragePolicy(new Path("/"),
+          HdfsConstants.COLD_STORAGE_POLICY_NAME);
+      fail("Should throw exception, when storage policy disabled");
+    } catch (IOException e) {
+      Assert.assertTrue(e.getMessage().contains(
+          "Failed to set storage policy since"));
+    } finally {
+      cluster.shutdown();
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ea2895f4/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java
index fce8917..6449bf7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java
@@ -461,4 +461,12 @@ public class TestParam {
     StartAfterParam param = new StartAfterParam(s);
     Assert.assertEquals(s, param.getValue());
   }
+
+  @Test
+  public void testStoragePolicyParam() {
+    StoragePolicyParam p = new StoragePolicyParam(StoragePolicyParam.DEFAULT);
+    Assert.assertEquals(null, p.getValue());
+    p = new StoragePolicyParam("COLD");
+    Assert.assertEquals("COLD", p.getValue());
+  }
 }


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