HDFS-7081. Add new DistributedFileSystem API for getting all the existing storage policies. Contributed by Jing Zhao.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -345,6 +345,9 @@ Trunk (Unreleased)
 
     HDFS-7095. TestStorageMover often fails in Jenkins. (jing9)
 
+    HDFS-7081. Add new DistributedFileSystem API for getting all the existing
+    storage policies. (jing9)
+
 Release 2.6.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/conf/blockStoragePolicy-site.xml

@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
-<!--
-  Licensed 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. See accompanying LICENSE file.
--->
-
-<!-- Put site-specific property overrides in this file. -->
-
-<configuration> 
-
-</configuration>

hadoop-hdfs-project/hadoop-hdfs/src/main/conf/hdfs-site.xml

@@ -16,7 +16,6 @@
 
 <!-- Put site-specific property overrides in this file. -->
 
-<configuration xmlns:xi="http://www.w3.org/2001/XInclude"> 
+<configuration>
-  <xi:include href="blockStoragePolicy-site.xml" />
 
 </configuration>

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -139,6 +139,7 @@ import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.net.TcpPeerServer;
 import org.apache.hadoop.hdfs.protocol.AclException;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveIterator;
@@ -1779,6 +1780,13 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
     }
   }
 
+  /**
+   * @return All the existing storage policies
+   */
+  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+    return namenode.getStoragePolicySuite();
+  }
+
   /**
    * Rename file or directory.
    * @see ClientProtocol#rename(String, String)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -438,14 +438,6 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final Class<BlockPlacementPolicyDefault> DFS_BLOCK_REPLICATOR_CLASSNAME_DEFAULT = BlockPlacementPolicyDefault.class;
   public static final String  DFS_REPLICATION_MAX_KEY = "dfs.replication.max";
   public static final int     DFS_REPLICATION_MAX_DEFAULT = 512;
-  public static final String DFS_BLOCK_STORAGE_POLICIES_KEY
-        = BlockStoragePolicy.DFS_BLOCK_STORAGE_POLICIES_KEY;
-  public static final String DFS_BLOCK_STORAGE_POLICY_KEY_PREFIX
-        = BlockStoragePolicy.DFS_BLOCK_STORAGE_POLICY_KEY_PREFIX;
-  public static final String DFS_BLOCK_STORAGE_POLICY_CREATION_FALLBACK_KEY_PREFIX
-        = BlockStoragePolicy.DFS_BLOCK_STORAGE_POLICY_CREATION_FALLBACK_KEY_PREFIX;
-  public static final String DFS_BLOCK_STORAGE_POLICY_REPLICATION_FALLBACK_KEY_PREFIX
-        = BlockStoragePolicy.DFS_BLOCK_STORAGE_POLICY_REPLICATION_FALLBACK_KEY_PREFIX;
 
   public static final String  DFS_DF_INTERVAL_KEY = "dfs.df.interval";
   public static final int     DFS_DF_INTERVAL_DEFAULT = 60000;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java

@@ -62,6 +62,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.hdfs.client.HdfsAdmin;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
@@ -504,6 +505,12 @@ public class DistributedFileSystem extends FileSystem {
     }.resolve(this, absF);
   }
 
+  /** Get all the existing storage policies */
+  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+    statistics.incrementReadOps(1);
+    return dfs.getStoragePolicySuite();
+  }
+
   /**
    * Move blocks from srcs to trg and delete srcs afterwards.
    * The file block sizes must be the same.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsAdmin.java

@@ -325,4 +325,15 @@ public class HdfsAdmin {
       throws IOException {
     return dfs.getInotifyEventStream(lastReadTxid);
   }
+
+  /**
+   * Set the source path to the specified storage policy.
+   *
+   * @param src The source path referring to either a directory or a file.
+   * @param policyName The name of the storage policy.
+   */
+  public void setStoragePolicy(final Path src, final String policyName)
+      throws IOException {
+    dfs.setStoragePolicy(src, policyName);
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/BlockStoragePolicy.java

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.protocol;
 
 import java.util.Arrays;
 import java.util.EnumSet;
@@ -24,12 +24,10 @@ import java.util.LinkedList;
 import java.util.List;
 
 import com.google.common.annotations.VisibleForTesting;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.StorageType;
-import org.apache.hadoop.fs.XAttr;
+import org.slf4j.Logger;
-import org.apache.hadoop.fs.XAttr.NameSpace;
+import org.slf4j.LoggerFactory;
 
 /**
  * A block storage policy describes how to select the storage types
@@ -37,67 +35,8 @@ import org.apache.hadoop.fs.XAttr.NameSpace;
  */
 @InterfaceAudience.Private
 public class BlockStoragePolicy {
-  public static final Log LOG = LogFactory.getLog(BlockStoragePolicy.class);
+  public static final Logger LOG = LoggerFactory.getLogger(BlockStoragePolicy
-
+      .class);
-  public static final String DFS_BLOCK_STORAGE_POLICIES_KEY
-      = "dfs.block.storage.policies";
-  public static final String DFS_BLOCK_STORAGE_POLICY_KEY_PREFIX
-      = "dfs.block.storage.policy.";
-  public static final String DFS_BLOCK_STORAGE_POLICY_CREATION_FALLBACK_KEY_PREFIX
-      = "dfs.block.storage.policy.creation-fallback.";
-  public static final String DFS_BLOCK_STORAGE_POLICY_REPLICATION_FALLBACK_KEY_PREFIX
-      = "dfs.block.storage.policy.replication-fallback.";
-  public static final String STORAGE_POLICY_XATTR_NAME = "bsp";
-  /** set the namespace to TRUSTED so that only privilege users can access */
-  public static final NameSpace XAttrNS = NameSpace.TRUSTED;
-
-  public static final int ID_BIT_LENGTH = 4;
-  public static final int ID_MAX = (1 << ID_BIT_LENGTH) - 1;
-  public static final byte ID_UNSPECIFIED = 0;
-
-  private static final Suite DEFAULT_SUITE = createDefaultSuite();
-
-  private static Suite createDefaultSuite() {
-    final BlockStoragePolicy[] policies = new BlockStoragePolicy[1 << ID_BIT_LENGTH];
-    final StorageType[] storageTypes = {StorageType.DISK};
-    final byte defaultPolicyId = 12;
-    policies[defaultPolicyId] = new BlockStoragePolicy(defaultPolicyId, "HOT",
-        storageTypes, StorageType.EMPTY_ARRAY, StorageType.EMPTY_ARRAY);
-    return new Suite(defaultPolicyId, policies);
-  }
-
-  /** A block storage policy suite. */
-  public static class Suite {
-    private final byte defaultPolicyID;
-    private final BlockStoragePolicy[] policies;
-    
-    private Suite(byte defaultPolicyID, BlockStoragePolicy[] policies) {
-      this.defaultPolicyID = defaultPolicyID;
-      this.policies = policies;
-    }
-    
-    /** @return the corresponding policy. */
-    public BlockStoragePolicy getPolicy(byte id) {
-      // id == 0 means policy not specified. 
-      return id == 0? getDefaultPolicy(): policies[id];
-    }
-
-    /** @return the default policy. */
-    public BlockStoragePolicy getDefaultPolicy() {
-      return getPolicy(defaultPolicyID);
-    }
-
-    public BlockStoragePolicy getPolicy(String policyName) {
-      if (policies != null) {
-        for (BlockStoragePolicy policy : policies) {
-          if (policy != null && policy.name.equals(policyName)) {
-            return policy;
-          }
-        }
-      }
-      return null;
-    }
-  }
 
   /** A 4-bit policy ID */
   private final byte id;
@@ -207,7 +146,8 @@ public class BlockStoragePolicy {
   }
 
   /**
-   * Compute the list difference t = t - c.
+   * Compute the difference between two lists t and c so that after the diff
+   * computation we have: t = t - c;
    * Further, if e is not null, set e = e + c - t;
    */
   private static void diff(List<StorageType> t, Iterable<StorageType> c,
@@ -280,6 +220,18 @@ public class BlockStoragePolicy {
     return name;
   }
 
+  public StorageType[] getStorageTypes() {
+    return this.storageTypes;
+  }
+
+  public StorageType[] getCreationFallbacks() {
+    return this.creationFallbacks;
+  }
+
+  public StorageType[] getReplicationFallbacks() {
+    return this.replicationFallbacks;
+  }
+
   private static StorageType getFallback(EnumSet<StorageType> unavailables,
       StorageType[] fallbacks) {
     for(StorageType fb : fallbacks) {
@@ -289,131 +241,4 @@ public class BlockStoragePolicy {
     }
     return null;
   }
-  
-  private static byte parseID(String idString, String element, Configuration conf) {
-    byte id = 0;
-    try {
-      id = Byte.parseByte(idString);
-    } catch(NumberFormatException nfe) {
-      throwIllegalArgumentException("Failed to parse policy ID \"" + idString
-          + "\" to a " + ID_BIT_LENGTH + "-bit integer", conf);
-    }
-    if (id < 0) {
-      throwIllegalArgumentException("Invalid policy ID: id = " + id
-          + " < 1 in \"" + element + "\"", conf);
-    } else if (id == 0) {
-      throw new IllegalArgumentException("Policy ID 0 is reserved: " + element);
-    } else if (id > ID_MAX) {
-      throwIllegalArgumentException("Invalid policy ID: id = " + id
-          + " > MAX = " + ID_MAX + " in \"" + element + "\"", conf);
-    }
-    return id;
-  }
-
-  private static StorageType[] parseStorageTypes(String[] strings) {
-    if (strings == null || strings.length == 0) {
-      return StorageType.EMPTY_ARRAY;
-    }
-    final StorageType[] types = new StorageType[strings.length];
-    for(int i = 0; i < types.length; i++) {
-      types[i] = StorageType.valueOf(strings[i].trim().toUpperCase());
-    }
-    return types;
-  }
-  
-  private static StorageType[] readStorageTypes(byte id, String keyPrefix,
-      Configuration conf) {
-    final String key = keyPrefix + id;
-    final String[] values = conf.getStrings(key);
-    try {
-      return parseStorageTypes(values);
-    } catch(Exception e) {
-      throw new IllegalArgumentException("Failed to parse " + key
-          + " \"" + conf.get(key), e);
-    }
-  }
-
-  private static BlockStoragePolicy readBlockStoragePolicy(byte id, String name,
-      Configuration conf) {
-    final StorageType[] storageTypes = readStorageTypes(id, 
-        DFS_BLOCK_STORAGE_POLICY_KEY_PREFIX, conf);
-    if (storageTypes.length == 0) {
-      throw new IllegalArgumentException(
-          DFS_BLOCK_STORAGE_POLICY_KEY_PREFIX + id + " is missing or is empty.");
-    }
-    final StorageType[] creationFallbacks = readStorageTypes(id, 
-        DFS_BLOCK_STORAGE_POLICY_CREATION_FALLBACK_KEY_PREFIX, conf);
-    final StorageType[] replicationFallbacks = readStorageTypes(id, 
-        DFS_BLOCK_STORAGE_POLICY_REPLICATION_FALLBACK_KEY_PREFIX, conf);
-    return new BlockStoragePolicy(id, name, storageTypes, creationFallbacks,
-        replicationFallbacks);
-  }
-
-  /** Read {@link Suite} from conf. */
-  public static Suite readBlockStorageSuite(Configuration conf) {
-    final BlockStoragePolicy[] policies = new BlockStoragePolicy[1 << ID_BIT_LENGTH];
-    final String[] values = conf.getStrings(DFS_BLOCK_STORAGE_POLICIES_KEY);
-    if (values == null) {
-      // conf property is missing, use default suite.
-      return DEFAULT_SUITE;
-    }
-    byte firstID = -1;
-    for(String v : values) {
-      v = v.trim();
-      final int i = v.indexOf(':');
-      if (i < 0) {
-        throwIllegalArgumentException("Failed to parse element \"" + v
-            + "\" (expected format is NAME:ID)", conf);
-      } else if (i == 0) {
-        throwIllegalArgumentException("Policy name is missing in \"" + v + "\"", conf);
-      } else if (i == v.length() - 1) {
-        throwIllegalArgumentException("Policy ID is missing in \"" + v + "\"", conf);
-      }
-      final String name = v.substring(0, i).trim();
-      for(int j = 1; j < policies.length; j++) {
-        if (policies[j] != null && policies[j].name.equals(name)) {
-          throwIllegalArgumentException("Policy name duplication: \""
-              + name + "\" appears more than once", conf);
-        }
-      }
-      
-      final byte id = parseID(v.substring(i + 1).trim(), v, conf);
-      if (policies[id] != null) {
-        throwIllegalArgumentException("Policy duplication: ID " + id
-            + " appears more than once", conf);
-      }
-      policies[id] = readBlockStoragePolicy(id, name, conf);
-      String prefix = "";
-      if (firstID == -1) {
-        firstID = id;
-        prefix = "(default) ";
-      }
-      LOG.info(prefix + policies[id]);
-    }
-    if (firstID == -1) {
-      throwIllegalArgumentException("Empty list is not allowed", conf);
-    }
-    return new Suite(firstID, policies);
-  }
-
-  public static String buildXAttrName() {
-    return XAttrNS.toString().toLowerCase() + "." + STORAGE_POLICY_XATTR_NAME;
-  }
-
-  public static XAttr buildXAttr(byte policyId) {
-    final String name = buildXAttrName();
-    return XAttrHelper.buildXAttr(name, new byte[] { policyId });
-  }
-
-  public static boolean isStoragePolicyXAttr(XAttr xattr) {
-    return xattr != null && xattr.getNameSpace() == BlockStoragePolicy.XAttrNS
-        && xattr.getName().equals(BlockStoragePolicy.STORAGE_POLICY_XATTR_NAME);
-  }
-
-  private static void throwIllegalArgumentException(String message,
-      Configuration conf) {
-    throw new IllegalArgumentException(message + " in "
-        + DFS_BLOCK_STORAGE_POLICIES_KEY + " \""
-        + conf.get(DFS_BLOCK_STORAGE_POLICIES_KEY) + "\".");
-  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java

@@ -259,6 +259,13 @@ public interface ClientProtocol {
       FileNotFoundException, SafeModeException, UnresolvedLinkException,
       SnapshotAccessControlException, IOException;
 
+  /**
+   * Get all the available block storage policies.
+   * @return All the in-use block storage policies currently.
+   */
+  @Idempotent
+  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException;
+
   /**
    * Set the storage policy for a file/directory
    * @param src Path of an existing file/directory. 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshottableDirectoryStatus.java

@@ -24,8 +24,8 @@ import java.util.Date;
 
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 
 /**
  * Metadata about a snapshottable directory
@@ -62,7 +62,7 @@ public class SnapshottableDirectoryStatus {
       int snapshotNumber, int snapshotQuota, byte[] parentFullPath) {
     this.dirStatus = new HdfsFileStatus(0, true, 0, 0, modification_time,
         access_time, permission, owner, group, null, localName, inodeId,
-        childrenNum, null, BlockStoragePolicy.ID_UNSPECIFIED);
+        childrenNum, null, BlockStoragePolicySuite.ID_UNSPECIFIED);
     this.snapshotNumber = snapshotNumber;
     this.snapshotQuota = snapshotQuota;
     this.parentFullPath = parentFullPath;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java

@@ -26,6 +26,7 @@ import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
 import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.Options.Rename;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
@@ -119,6 +120,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSna
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshotDiffReportResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshottableDirListingRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshottableDirListingResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCacheDirectivesRequestProto;
@@ -1429,6 +1432,26 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
     return VOID_SET_STORAGE_POLICY_RESPONSE;
   }
 
+  @Override
+  public GetStoragePolicySuiteResponseProto getStoragePolicySuite(
+      RpcController controller, GetStoragePolicySuiteRequestProto request)
+      throws ServiceException {
+    try {
+      BlockStoragePolicy[] policies = server.getStoragePolicySuite();
+      GetStoragePolicySuiteResponseProto.Builder builder =
+          GetStoragePolicySuiteResponseProto.newBuilder();
+      if (policies == null) {
+        return builder.build();
+      }
+      for (BlockStoragePolicy policy : policies) {
+        builder.addPolicies(PBHelper.convert(policy));
+      }
+      return builder.build();
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+  }
+
   public GetCurrentEditLogTxidResponseProto getCurrentEditLogTxid(RpcController controller,
       GetCurrentEditLogTxidRequestProto req) throws ServiceException {
     try {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java

@@ -45,6 +45,7 @@ import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.inotify.EventsList;
 import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
@@ -64,9 +65,7 @@ import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.NSQuotaExceededException;
-import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
 import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
-import org.apache.hadoop.hdfs.protocol.SnapshotAccessControlException;
 import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
 import org.apache.hadoop.hdfs.protocol.proto.AclProtos.GetAclStatusRequestProto;
@@ -119,6 +118,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSna
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshotDiffReportResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshottableDirListingRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshottableDirListingResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCacheDirectivesRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCacheDirectivesResponseProto;
@@ -159,13 +160,13 @@ import org.apache.hadoop.hdfs.protocol.proto.EncryptionZonesProtos;
 import org.apache.hadoop.hdfs.protocol.proto.EncryptionZonesProtos.CreateEncryptionZoneRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.EncryptionZonesProtos.GetEZForPathRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.EncryptionZonesProtos.ListEncryptionZonesRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.GetXAttrsRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.ListXAttrsRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.RemoveXAttrRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.SetXAttrRequestProto;
 import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
-import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp;
 import org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException;
 import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
@@ -225,6 +226,10 @@ public class ClientNamenodeProtocolTranslatorPB implements
   VOID_GET_DATA_ENCRYPTIONKEY_REQUEST =
       GetDataEncryptionKeyRequestProto.newBuilder().build();
 
+  private final static GetStoragePolicySuiteRequestProto
+  VOID_GET_STORAGE_POLICY_SUITE_REQUEST =
+      GetStoragePolicySuiteRequestProto.newBuilder().build();
+
   public ClientNamenodeProtocolTranslatorPB(ClientNamenodeProtocolPB proxy) {
     rpcProxy = proxy;
   }
@@ -1440,8 +1445,7 @@ public class ClientNamenodeProtocolTranslatorPB implements
 
   @Override
   public void setStoragePolicy(String src, String policyName)
-      throws SnapshotAccessControlException, UnresolvedLinkException,
+      throws IOException {
-      FileNotFoundException, QuotaExceededException, IOException {
     SetStoragePolicyRequestProto req = SetStoragePolicyRequestProto
         .newBuilder().setSrc(src).setPolicyName(policyName).build();
     try {
@@ -1451,6 +1455,17 @@ public class ClientNamenodeProtocolTranslatorPB implements
     }
   }
 
+  @Override
+  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+    try {
+      GetStoragePolicySuiteResponseProto response = rpcProxy
+          .getStoragePolicySuite(null, VOID_GET_STORAGE_POLICY_SUITE_REQUEST);
+      return PBHelper.convertStoragePolicies(response.getPoliciesList());
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
   public long getCurrentEditLogTxid() throws IOException {
     GetCurrentEditLogTxidRequestProto req = GetCurrentEditLogTxidRequestProto
         .getDefaultInstance();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java

@@ -44,7 +44,7 @@ import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.ha.proto.HAServiceProtocolProtos;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.inotify.Event;
@@ -120,6 +120,7 @@ import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.RegisterComm
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockKeyProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockStoragePolicyProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockWithLocationsProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlocksWithLocationsProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.CheckpointCommandProto;
@@ -174,6 +175,7 @@ import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
 import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
@@ -280,6 +282,65 @@ public class PBHelper {
     return null;
   }
 
+  public static BlockStoragePolicy[] convertStoragePolicies(
+      List<BlockStoragePolicyProto> policyProtos) {
+    if (policyProtos == null || policyProtos.size() == 0) {
+      return new BlockStoragePolicy[0];
+    }
+    BlockStoragePolicy[] policies = new BlockStoragePolicy[policyProtos.size()];
+    int i = 0;
+    for (BlockStoragePolicyProto proto : policyProtos) {
+      policies[i++] = convert(proto);
+    }
+    return policies;
+  }
+
+  public static BlockStoragePolicy convert(BlockStoragePolicyProto proto) {
+    List<StorageTypeProto> cList = proto.getCreationPolicy()
+        .getStorageTypesList();
+    StorageType[] creationTypes = convertStorageTypes(cList, cList.size());
+    List<StorageTypeProto> cfList = proto.hasCreationFallbackPolicy() ? proto
+        .getCreationFallbackPolicy().getStorageTypesList() : null;
+    StorageType[] creationFallbackTypes = cfList == null ? StorageType
+        .EMPTY_ARRAY : convertStorageTypes(cfList, cfList.size());
+    List<StorageTypeProto> rfList = proto.hasReplicationFallbackPolicy() ?
+        proto.getReplicationFallbackPolicy().getStorageTypesList() : null;
+    StorageType[] replicationFallbackTypes = rfList == null ? StorageType
+        .EMPTY_ARRAY : convertStorageTypes(rfList, rfList.size());
+    return new BlockStoragePolicy((byte) proto.getPolicyId(), proto.getName(),
+        creationTypes, creationFallbackTypes, replicationFallbackTypes);
+  }
+
+  public static BlockStoragePolicyProto convert(BlockStoragePolicy policy) {
+    BlockStoragePolicyProto.Builder builder = BlockStoragePolicyProto
+        .newBuilder().setPolicyId(policy.getId()).setName(policy.getName());
+    // creation storage types
+    StorageTypesProto creationProto = convert(policy.getStorageTypes());
+    Preconditions.checkArgument(creationProto != null);
+    builder.setCreationPolicy(creationProto);
+    // creation fallback
+    StorageTypesProto creationFallbackProto = convert(
+        policy.getCreationFallbacks());
+    if (creationFallbackProto != null) {
+      builder.setCreationFallbackPolicy(creationFallbackProto);
+    }
+    // replication fallback
+    StorageTypesProto replicationFallbackProto = convert(
+        policy.getReplicationFallbacks());
+    if (replicationFallbackProto != null) {
+      builder.setReplicationFallbackPolicy(replicationFallbackProto);
+    }
+    return builder.build();
+  }
+
+  public static StorageTypesProto convert(StorageType[] types) {
+    if (types == null || types.length == 0) {
+      return null;
+    }
+    List<StorageTypeProto> list = convertStorageTypes(types);
+    return StorageTypesProto.newBuilder().addAllStorageTypes(list).build();
+  }
+
   public static StorageInfoProto convert(StorageInfo info) {
     return StorageInfoProto.newBuilder().setClusterID(info.getClusterID())
         .setCTime(info.getCTime()).setLayoutVersion(info.getLayoutVersion())
@@ -1349,7 +1410,7 @@ public class PBHelper {
         fs.hasChildrenNum() ? fs.getChildrenNum() : -1,
         fs.hasFileEncryptionInfo() ? convert(fs.getFileEncryptionInfo()) : null,
         fs.hasStoragePolicy() ? (byte) fs.getStoragePolicy()
-            : BlockStoragePolicy.ID_UNSPECIFIED);
+            : BlockStoragePolicySuite.ID_UNSPECIFIED);
   }
 
   public static SnapshottableDirectoryStatus convert(

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -42,7 +42,7 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.HadoopIllegalArgumentException;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.HAUtil;
@@ -255,7 +255,7 @@ public class BlockManager {
 
   /** for block replicas placement */
   private BlockPlacementPolicy blockplacement;
-  private final BlockStoragePolicy.Suite storagePolicySuite;
+  private final BlockStoragePolicySuite storagePolicySuite;
 
   /** Check whether name system is running before terminating */
   private boolean checkNSRunning = true;
@@ -278,7 +278,7 @@ public class BlockManager {
     blockplacement = BlockPlacementPolicy.getInstance(
         conf, stats, datanodeManager.getNetworkTopology(), 
         datanodeManager.getHost2DatanodeMap());
-    storagePolicySuite = BlockStoragePolicy.readBlockStorageSuite(conf);
+    storagePolicySuite = BlockStoragePolicySuite.createDefaultSuite();
     pendingReplications = new PendingReplicationBlocks(conf.getInt(
       DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY,
       DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_DEFAULT) * 1000L);
@@ -402,6 +402,10 @@ public class BlockManager {
     return storagePolicySuite.getPolicy(policyName);
   }
 
+  public BlockStoragePolicy[] getStoragePolicySuite() {
+    return storagePolicySuite.getAllPolicies();
+  }
+
   public void setBlockPoolId(String blockPoolId) {
     if (isBlockTokenEnabled()) {
       blockTokenSecretManager.setBlockPoolId(blockPoolId);
@@ -3599,7 +3603,7 @@ public class BlockManager {
     }
     
     private void chooseTargets(BlockPlacementPolicy blockplacement,
-        BlockStoragePolicy.Suite storagePolicySuite,
+        BlockStoragePolicySuite storagePolicySuite,
         Set<Node> excludedNodes) {
       targets = blockplacement.chooseTarget(bc.getName(),
           additionalReplRequired, srcNode, liveReplicaStorages, false,

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicy.java

@@ -27,7 +27,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.protocol.Block;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java

@@ -23,7 +23,7 @@ import java.util.*;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.StorageType;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockStoragePolicySuite.java

@@ -0,0 +1,119 @@
+/**
+ * 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.server.blockmanagement;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.Lists;
+import org.apache.hadoop.fs.XAttr;
+import org.apache.hadoop.hdfs.StorageType;
+import org.apache.hadoop.hdfs.XAttrHelper;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+
+/** A collection of block storage policies. */
+public class BlockStoragePolicySuite {
+  static final Logger LOG = LoggerFactory.getLogger(BlockStoragePolicySuite
+      .class);
+
+  public static final String STORAGE_POLICY_XATTR_NAME
+      = "hsm.block.storage.policy.id";
+  public static final XAttr.NameSpace XAttrNS = XAttr.NameSpace.SYSTEM;
+
+  public static final int ID_BIT_LENGTH = 4;
+  public static final byte ID_UNSPECIFIED = 0;
+
+  @VisibleForTesting
+  public static BlockStoragePolicySuite createDefaultSuite() {
+    final BlockStoragePolicy[] policies =
+        new BlockStoragePolicy[1 << ID_BIT_LENGTH];
+    final byte hotId = 12;
+    policies[hotId] = new BlockStoragePolicy(hotId, "HOT",
+        new StorageType[]{StorageType.DISK}, StorageType.EMPTY_ARRAY,
+        new StorageType[]{StorageType.ARCHIVE});
+    final byte warmId = 8;
+    policies[warmId] = new BlockStoragePolicy(warmId, "WARM",
+        new StorageType[]{StorageType.DISK, StorageType.ARCHIVE},
+        new StorageType[]{StorageType.DISK, StorageType.ARCHIVE},
+        new StorageType[]{StorageType.DISK, StorageType.ARCHIVE});
+    final byte coldId = 4;
+    policies[coldId] = new BlockStoragePolicy(coldId, "COLD",
+        new StorageType[]{StorageType.ARCHIVE}, StorageType.EMPTY_ARRAY,
+        StorageType.EMPTY_ARRAY);
+    return new BlockStoragePolicySuite(hotId, policies);
+  }
+
+  private final byte defaultPolicyID;
+  private final BlockStoragePolicy[] policies;
+
+  public BlockStoragePolicySuite(byte defaultPolicyID,
+      BlockStoragePolicy[] policies) {
+    this.defaultPolicyID = defaultPolicyID;
+    this.policies = policies;
+  }
+
+  /** @return the corresponding policy. */
+  public BlockStoragePolicy getPolicy(byte id) {
+    // id == 0 means policy not specified.
+    return id == 0? getDefaultPolicy(): policies[id];
+  }
+
+  /** @return the default policy. */
+  public BlockStoragePolicy getDefaultPolicy() {
+    return getPolicy(defaultPolicyID);
+  }
+
+  public BlockStoragePolicy getPolicy(String policyName) {
+    if (policies != null) {
+      for (BlockStoragePolicy policy : policies) {
+        if (policy != null && policy.getName().equals(policyName)) {
+          return policy;
+        }
+      }
+    }
+    return null;
+  }
+
+  public BlockStoragePolicy[] getAllPolicies() {
+    List<BlockStoragePolicy> list = Lists.newArrayList();
+    if (policies != null) {
+      for (BlockStoragePolicy policy : policies) {
+        if (policy != null) {
+          list.add(policy);
+        }
+      }
+    }
+    return list.toArray(new BlockStoragePolicy[list.size()]);
+  }
+
+  public static String buildXAttrName() {
+    return XAttrNS.toString().toLowerCase() + "." + STORAGE_POLICY_XATTR_NAME;
+  }
+
+  public static XAttr buildXAttr(byte policyId) {
+    final String name = buildXAttrName();
+    return XAttrHelper.buildXAttr(name, new byte[]{policyId});
+  }
+
+  public static boolean isStoragePolicyXAttr(XAttr xattr) {
+    return xattr != null && xattr.getNameSpace() == XAttrNS
+        && xattr.getName().equals(STORAGE_POLICY_XATTR_NAME);
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/mover/Mover.java

@@ -36,6 +36,7 @@ import org.apache.hadoop.hdfs.server.balancer.Dispatcher.DDatanode.StorageGroup;
 import org.apache.hadoop.hdfs.server.balancer.ExitStatus;
 import org.apache.hadoop.hdfs.server.balancer.Matcher;
 import org.apache.hadoop.hdfs.server.balancer.NameNodeConnector;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.namenode.INode;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.hdfs.server.protocol.StorageReport;
@@ -102,7 +103,7 @@ public class Mover {
   private final StorageMap storages;
   private final List<Path> targetPaths;
 
-  private final BlockStoragePolicy.Suite blockStoragePolicies;
+  private final BlockStoragePolicy[] blockStoragePolicies;
 
   Mover(NameNodeConnector nnc, Configuration conf) {
     final long movedWinWidth = conf.getLong(
@@ -119,11 +120,13 @@ public class Mover {
         Collections.<String> emptySet(), movedWinWidth, moverThreads, 0,
         maxConcurrentMovesPerNode, conf);
     this.storages = new StorageMap();
-    this.blockStoragePolicies = BlockStoragePolicy.readBlockStorageSuite(conf);
     this.targetPaths = nnc.getTargetPaths();
+    this.blockStoragePolicies = new BlockStoragePolicy[1 <<
+        BlockStoragePolicySuite.ID_BIT_LENGTH];
   }
 
   void init() throws IOException {
+    initStoragePolicies();
     final List<DatanodeStorageReport> reports = dispatcher.init();
     for(DatanodeStorageReport r : reports) {
       final DDatanode dn = dispatcher.newDatanode(r.getDatanodeInfo());
@@ -137,6 +140,14 @@ public class Mover {
     }
   }
 
+  private void initStoragePolicies() throws IOException {
+    BlockStoragePolicy[] policies = dispatcher.getDistributedFileSystem()
+        .getStoragePolicySuite();
+    for (BlockStoragePolicy policy : policies) {
+      this.blockStoragePolicies[policy.getId()] = policy;
+    }
+  }
+
   private ExitStatus run() {
     try {
       init();
@@ -305,7 +316,7 @@ public class Mover {
           if (!isSnapshotPathInCurrent(fullPath)) {
             // the full path is a snapshot path but it is also included in the
             // current directory tree, thus ignore it.
-            hasRemaining = processFile((HdfsLocatedFileStatus)status);
+            hasRemaining = processFile(fullPath, (HdfsLocatedFileStatus)status);
           }
         } catch (IOException e) {
           LOG.warn("Failed to check the status of " + parent
@@ -317,9 +328,17 @@ public class Mover {
     }
 
     /** @return true if it is necessary to run another round of migration */
-    private boolean processFile(HdfsLocatedFileStatus status) {
+    private boolean processFile(String fullPath, HdfsLocatedFileStatus status) {
-      final BlockStoragePolicy policy = blockStoragePolicies.getPolicy(
+      final byte policyId = status.getStoragePolicy();
-          status.getStoragePolicy());
+      // currently we ignore files with unspecified storage policy
+      if (policyId == BlockStoragePolicySuite.ID_UNSPECIFIED) {
+        return false;
+      }
+      final BlockStoragePolicy policy = blockStoragePolicies[policyId];
+      if (policy == null) {
+        LOG.warn("Failed to get the storage policy of file " + fullPath);
+        return false;
+      }
       final List<StorageType> types = policy.chooseStorageTypes(
           status.getReplication());
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java

@@ -53,7 +53,6 @@ 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.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
@@ -79,6 +78,7 @@ import org.apache.hadoop.hdfs.protocolPB.PBHelper;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
 import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
@@ -1037,7 +1037,7 @@ public class FSDirectory implements Closeable {
   private void setDirStoragePolicy(INodeDirectory inode, byte policyId,
       int latestSnapshotId) throws IOException {
     List<XAttr> existingXAttrs = XAttrStorage.readINodeXAttrs(inode);
-    XAttr xAttr = BlockStoragePolicy.buildXAttr(policyId);
+    XAttr xAttr = BlockStoragePolicySuite.buildXAttr(policyId);
     List<XAttr> newXAttrs = setINodeXAttrs(existingXAttrs, Arrays.asList(xAttr),
         EnumSet.of(XAttrSetFlag.CREATE, XAttrSetFlag.REPLACE));
     XAttrStorage.updateINodeXAttrs(inode, newXAttrs, latestSnapshotId);
@@ -1375,7 +1375,7 @@ public class FSDirectory implements Closeable {
   }
 
   private byte getStoragePolicyID(byte inodePolicy, byte parentPolicy) {
-    return inodePolicy != BlockStoragePolicy.ID_UNSPECIFIED ? inodePolicy :
+    return inodePolicy != BlockStoragePolicySuite.ID_UNSPECIFIED ? inodePolicy :
         parentPolicy;
   }
 
@@ -1410,7 +1410,7 @@ public class FSDirectory implements Closeable {
       if (targetNode == null)
         return null;
       byte parentStoragePolicy = isSuperUser ?
-          targetNode.getStoragePolicyID() : BlockStoragePolicy.ID_UNSPECIFIED;
+          targetNode.getStoragePolicyID() : BlockStoragePolicySuite.ID_UNSPECIFIED;
       
       if (!targetNode.isDirectory()) {
         return new DirectoryListing(
@@ -1430,7 +1430,8 @@ public class FSDirectory implements Closeable {
       for (int i=0; i<numOfListing && locationBudget>0; i++) {
         INode cur = contents.get(startChild+i);
         byte curPolicy = isSuperUser && !cur.isSymlink()?
-            cur.getLocalStoragePolicyID(): BlockStoragePolicy.ID_UNSPECIFIED;
+            cur.getLocalStoragePolicyID():
+            BlockStoragePolicySuite.ID_UNSPECIFIED;
         listing[i] = createFileStatus(cur.getLocalNameBytes(), cur, needLocation,
             getStoragePolicyID(curPolicy, parentStoragePolicy), snapshot,
             isRawPath, inodesInPath);
@@ -1484,7 +1485,7 @@ public class FSDirectory implements Closeable {
     for (int i = 0; i < numOfListing; i++) {
       Root sRoot = snapshots.get(i + skipSize).getRoot();
       listing[i] = createFileStatus(sRoot.getLocalNameBytes(), sRoot,
-          BlockStoragePolicy.ID_UNSPECIFIED, Snapshot.CURRENT_STATE_ID,
+          BlockStoragePolicySuite.ID_UNSPECIFIED, Snapshot.CURRENT_STATE_ID,
           false, null);
     }
     return new DirectoryListing(
@@ -1512,7 +1513,7 @@ public class FSDirectory implements Closeable {
       final INode[] inodes = inodesInPath.getINodes();
       final INode i = inodes[inodes.length - 1];
       byte policyId = includeStoragePolicy && i != null && !i.isSymlink() ?
-          i.getStoragePolicyID() : BlockStoragePolicy.ID_UNSPECIFIED;
+          i.getStoragePolicyID() : BlockStoragePolicySuite.ID_UNSPECIFIED;
       return i == null ? null : createFileStatus(HdfsFileStatus.EMPTY_NAME, i,
           policyId, inodesInPath.getPathSnapshotId(), isRawPath,
           inodesInPath);
@@ -1532,7 +1533,8 @@ public class FSDirectory implements Closeable {
       throws UnresolvedLinkException {
     if (getINode4DotSnapshot(src) != null) {
       return new HdfsFileStatus(0, true, 0, 0, 0, 0, null, null, null, null,
-          HdfsFileStatus.EMPTY_NAME, -1L, 0, null, BlockStoragePolicy.ID_UNSPECIFIED);
+          HdfsFileStatus.EMPTY_NAME, -1L, 0, null,
+          BlockStoragePolicySuite.ID_UNSPECIFIED);
     }
     return null;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java

@@ -33,7 +33,7 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.fs.XAttrSetFlag;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
@@ -373,7 +373,7 @@ public class FSEditLogLoader {
         if (toAddRetryCache) {
           HdfsFileStatus stat = fsNamesys.dir.createFileStatus(
               HdfsFileStatus.EMPTY_NAME, newFile,
-              BlockStoragePolicy.ID_UNSPECIFIED, Snapshot.CURRENT_STATE_ID,
+              BlockStoragePolicySuite.ID_UNSPECIFIED, Snapshot.CURRENT_STATE_ID,
               false, iip);
           fsNamesys.addCacheEntryWithPayload(addCloseOp.rpcClientId,
               addCloseOp.rpcCallId, stat);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -17,8 +17,7 @@
  */
 package org.apache.hadoop.hdfs.server.namenode;
 
-import static org.apache.hadoop.crypto.key.KeyProviderCryptoExtension
+import static org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.EncryptedKeyVersion;
-    .EncryptedKeyVersion;
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_TRASH_INTERVAL_DEFAULT;
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_TRASH_INTERVAL_KEY;
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_DEFAULT;
@@ -160,7 +159,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.ha.ServiceFailedException;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.HAUtil;
@@ -2302,6 +2301,21 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     logAuditEvent(true, "setStoragePolicy", src, null, fileStat);
   }
 
+  /**
+   * @return All the existing block storage policies
+   */
+  BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+    checkOperation(OperationCategory.READ);
+    waitForLoadingFSImage();
+    readLock();
+    try {
+      checkOperation(OperationCategory.READ);
+      return blockManager.getStoragePolicySuite();
+    } finally {
+      readUnlock();
+    }
+  }
+
   long getPreferredBlockSize(String filename) 
       throws IOException, UnresolvedLinkException {
     FSPermissionChecker pc = getPermissionChecker();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java

@@ -29,7 +29,7 @@ import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
@@ -695,7 +695,7 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
 
   /**
    * @return the storage policy directly specified on the INode. Return
-   * {@link BlockStoragePolicy#ID_UNSPECIFIED} if no policy has
+   * {@link BlockStoragePolicySuite#ID_UNSPECIFIED} if no policy has
    * been specified.
    */
   public abstract byte getLocalStoragePolicyID();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java

@@ -28,10 +28,11 @@ import java.util.Map;
 import org.apache.hadoop.fs.PathIsNotDirectoryException;
 import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.fs.permission.PermissionStatus;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
 import org.apache.hadoop.hdfs.protocol.SnapshotException;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.namenode.INodeReference.WithCount;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.DirectorySnapshottableFeature;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature;
@@ -112,22 +113,22 @@ public class INodeDirectory extends INodeWithAdditionalFields
     ImmutableList<XAttr> xattrs = f == null ? ImmutableList.<XAttr> of() : f
         .getXAttrs();
     for (XAttr xattr : xattrs) {
-      if (BlockStoragePolicy.isStoragePolicyXAttr(xattr)) {
+      if (BlockStoragePolicySuite.isStoragePolicyXAttr(xattr)) {
         return (xattr.getValue())[0];
       }
     }
-    return BlockStoragePolicy.ID_UNSPECIFIED;
+    return BlockStoragePolicySuite.ID_UNSPECIFIED;
   }
 
   @Override
   public byte getStoragePolicyID() {
     byte id = getLocalStoragePolicyID();
-    if (id != BlockStoragePolicy.ID_UNSPECIFIED) {
+    if (id != BlockStoragePolicySuite.ID_UNSPECIFIED) {
       return id;
     }
     // if it is unspecified, check its parent
     return getParent() != null ? getParent().getStoragePolicyID() :
-        BlockStoragePolicy.ID_UNSPECIFIED;
+        BlockStoragePolicySuite.ID_UNSPECIFIED;
   }
 
   void setQuota(long nsQuota, long dsQuota) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectoryAttributes.java

@@ -18,12 +18,9 @@
 package org.apache.hadoop.hdfs.server.namenode;
 
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.fs.permission.PermissionStatus;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
 
 import com.google.common.base.Preconditions;
-import com.google.common.collect.ImmutableList;
 
 /**
  * The attributes of an inode.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java

@@ -28,12 +28,12 @@ import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.permission.PermissionStatus;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockCollection;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.FileDiff;
@@ -79,7 +79,8 @@ public class INodeFile extends INodeWithAdditionalFields
   static enum HeaderFormat {
     PREFERRED_BLOCK_SIZE(null, 48, 1),
     REPLICATION(PREFERRED_BLOCK_SIZE.BITS, 12, 1),
-    STORAGE_POLICY_ID(REPLICATION.BITS, BlockStoragePolicy.ID_BIT_LENGTH, 0);
+    STORAGE_POLICY_ID(REPLICATION.BITS, BlockStoragePolicySuite.ID_BIT_LENGTH,
+        0);
 
     private final LongBitFormat BITS;
 
@@ -374,7 +375,7 @@ public class INodeFile extends INodeWithAdditionalFields
   @Override
   public byte getStoragePolicyID() {
     byte id = getLocalStoragePolicyID();
-    if (id == BlockStoragePolicy.ID_UNSPECIFIED) {
+    if (id == BlockStoragePolicySuite.ID_UNSPECIFIED) {
       return this.getParent() != null ?
           this.getParent().getStoragePolicyID() : id;
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeMap.java

@@ -22,8 +22,9 @@ import java.util.List;
 
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.namenode.Quota.Counts;
 import org.apache.hadoop.util.GSet;
 import org.apache.hadoop.util.LightWeightGSet;
@@ -125,12 +126,12 @@ public class INodeMap {
 
       @Override
       public byte getStoragePolicyID(){
-        return BlockStoragePolicy.ID_UNSPECIFIED;
+        return BlockStoragePolicySuite.ID_UNSPECIFIED;
       }
 
       @Override
       public byte getLocalStoragePolicyID() {
-        return BlockStoragePolicy.ID_UNSPECIFIED;
+        return BlockStoragePolicySuite.ID_UNSPECIFIED;
       }
     };
       

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java

@@ -72,6 +72,7 @@ import org.apache.hadoop.hdfs.inotify.EventsList;
 import org.apache.hadoop.hdfs.protocol.AclException;
 import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
@@ -592,6 +593,11 @@ class NameNodeRpcServer implements NamenodeProtocols {
     namesystem.setStoragePolicy(src, policyName);
   }
 
+  @Override
+  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+    return namesystem.getStoragePolicySuite();
+  }
+
   @Override // ClientProtocol
   public void setPermission(String src, FsPermission permissions)
       throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java

@@ -44,7 +44,7 @@ import org.apache.hadoop.fs.FsStatus;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.shell.Command;
 import org.apache.hadoop.fs.shell.CommandFormat;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
@@ -63,6 +63,7 @@ import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
 import org.apache.hadoop.hdfs.protocol.SnapshotException;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.TransferFsImage;
 import org.apache.hadoop.ipc.GenericRefreshProtocol;
@@ -609,15 +610,18 @@ public class DFSAdmin extends FsShell {
           + argv[1]);
     }
     byte storagePolicyId = status.getStoragePolicy();
-    BlockStoragePolicy.Suite suite = BlockStoragePolicy
+    if (storagePolicyId == BlockStoragePolicySuite.ID_UNSPECIFIED) {
-        .readBlockStorageSuite(getConf());
+      System.out.println("The storage policy of " + argv[1] + " is unspecified");
-    BlockStoragePolicy policy = suite.getPolicy(storagePolicyId);
-    if (policy != null) {
-      System.out.println("The storage policy of " + argv[1] + ":\n" + policy);
       return 0;
-    } else {
-      throw new IOException("Cannot identify the storage policy for " + argv[1]);
     }
+    BlockStoragePolicy[] policies = dfs.getStoragePolicySuite();
+    for (BlockStoragePolicy p : policies) {
+      if (p.getId() == storagePolicyId) {
+        System.out.println("The storage policy of " + argv[1] + ":\n" + p);
+        return 0;
+      }
+    }
+    throw new IOException("Cannot identify the storage policy for " + argv[1]);
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java

@@ -21,13 +21,14 @@ import org.apache.hadoop.fs.*;
 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.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.XAttrHelper;
 import org.apache.hadoop.hdfs.protocol.*;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.namenode.INodeId;
 import org.apache.hadoop.ipc.RemoteException;
 import org.apache.hadoop.security.token.Token;
@@ -264,7 +265,7 @@ public class JsonUtil {
             : childrenNumLong.intValue();
     final byte storagePolicy = m.containsKey("storagePolicy") ?
         (byte) (long) (Long) m.get("storagePolicy") :
-          BlockStoragePolicy.ID_UNSPECIFIED;
+          BlockStoragePolicySuite.ID_UNSPECIFIED;
     return new HdfsFileStatus(len, type == PathType.DIRECTORY, replication,
         blockSize, mTime, aTime, permission, owner, group, symlink,
         DFSUtil.string2Bytes(localName), fileId, childrenNum, null, storagePolicy);

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto

@@ -108,6 +108,13 @@ message SetStoragePolicyRequestProto {
 message SetStoragePolicyResponseProto { // void response
 }
 
+message GetStoragePolicySuiteRequestProto { // void request
+}
+
+message GetStoragePolicySuiteResponseProto {
+  repeated BlockStoragePolicyProto policies = 1;
+}
+
 message SetPermissionRequestProto {
   required string src = 1;
   required FsPermissionProto permission = 2;
@@ -699,6 +706,8 @@ service ClientNamenodeProtocol {
       returns(SetReplicationResponseProto);
   rpc setStoragePolicy(SetStoragePolicyRequestProto)
       returns(SetStoragePolicyResponseProto);
+  rpc getStoragePolicySuite(GetStoragePolicySuiteRequestProto)
+      returns(GetStoragePolicySuiteResponseProto);
   rpc setPermission(SetPermissionRequestProto)
       returns(SetPermissionResponseProto);
   rpc setOwner(SetOwnerRequestProto) returns(SetOwnerResponseProto);

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/hdfs.proto

@@ -168,6 +168,20 @@ message StorageTypesProto {
   repeated StorageTypeProto storageTypes = 1;
 }
 
+/**
+ * Block replica storage policy.
+ */
+message BlockStoragePolicyProto {
+  required uint32 policyId = 1;
+  required string name = 2;
+  // a list of storage types for storing the block replicas when creating a
+  // block.
+  required StorageTypesProto creationPolicy = 3;
+  // A list of storage types for creation fallback storage.
+  optional StorageTypesProto creationFallbackPolicy = 4;
+  optional StorageTypesProto replicationFallbackPolicy = 5;
+}
+
 /**
  * A list of storage IDs. 
  */

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -22,8 +22,7 @@
 <!-- wish to modify from this file into hdfs-site.xml and change them -->
 <!-- there.  If hdfs-site.xml does not already exist, create it.      -->
 
-<configuration xmlns:xi="http://www.w3.org/2001/XInclude"> 
+<configuration>
-  <xi:include href="blockStoragePolicy-default.xml" />
 
 <property>
   <name>hadoop.hdfs.configuration.version</name>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestBlockStoragePolicy.java

@@ -17,7 +17,7 @@
  */
 package org.apache.hadoop.hdfs;
 
-import static org.apache.hadoop.hdfs.BlockStoragePolicy.ID_UNSPECIFIED;
+import static org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite.ID_UNSPECIFIED;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -34,6 +34,7 @@ import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
+import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.ipc.RemoteException;
 import org.apache.hadoop.net.NetworkTopology;
 import org.apache.hadoop.net.Node;
@@ -44,7 +45,7 @@ import org.junit.Test;
 
 /** Test {@link BlockStoragePolicy} */
 public class TestBlockStoragePolicy {
-  public static final BlockStoragePolicy.Suite POLICY_SUITE;
+  public static final BlockStoragePolicySuite POLICY_SUITE;
   public static final BlockStoragePolicy DEFAULT_STORAGE_POLICY;
   public static final Configuration conf;
 
@@ -52,7 +53,7 @@ public class TestBlockStoragePolicy {
     conf = new HdfsConfiguration();
     conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 1);
-    POLICY_SUITE = BlockStoragePolicy.readBlockStorageSuite(conf);
+    POLICY_SUITE = BlockStoragePolicySuite.createDefaultSuite();
     DEFAULT_STORAGE_POLICY = POLICY_SUITE.getDefaultPolicy();
   }
 
@@ -948,7 +949,7 @@ public class TestBlockStoragePolicy {
     Assert.assertTrue(typeList.isEmpty());
   }
 
-  private void testIncreaseFileRep(String policyName, byte policyId,
+  private void testChangeFileRep(String policyName, byte policyId,
                                    StorageType[] before,
                                    StorageType[] after) throws Exception {
     final int numDataNodes = 5;
@@ -965,8 +966,6 @@ public class TestBlockStoragePolicy {
       final Path foo = new Path(dir, "foo");
       DFSTestUtil.createFile(fs, foo, FILE_LEN, REPLICATION, 0L);
 
-      // the storage policy of foo should be WARM, and the replicas
-      // should be stored in DISK and ARCHIE
       HdfsFileStatus[] status = fs.getClient().listPaths(foo.toString(),
           HdfsFileStatus.EMPTY_NAME, true).getPartialListing();
       checkDirectoryListing(status, policyId);
@@ -984,7 +983,24 @@ public class TestBlockStoragePolicy {
           HdfsFileStatus.EMPTY_NAME, true).getPartialListing();
       checkDirectoryListing(status, policyId);
       fooStatus = (HdfsLocatedFileStatus) status[0];
-      checkLocatedBlocks(fooStatus, 1, 5, after);
+      checkLocatedBlocks(fooStatus, 1, numDataNodes, after);
+
+      // change the replication factor back to 3
+      fs.setReplication(foo, REPLICATION);
+      Thread.sleep(1000);
+      for (DataNode dn : cluster.getDataNodes()) {
+        DataNodeTestUtils.triggerHeartbeat(dn);
+      }
+      Thread.sleep(1000);
+      for (DataNode dn : cluster.getDataNodes()) {
+        DataNodeTestUtils.triggerBlockReport(dn);
+      }
+      Thread.sleep(1000);
+      status = fs.getClient().listPaths(foo.toString(),
+          HdfsFileStatus.EMPTY_NAME, true).getPartialListing();
+      checkDirectoryListing(status, policyId);
+      fooStatus = (HdfsLocatedFileStatus) status[0];
+      checkLocatedBlocks(fooStatus, 1, REPLICATION, before);
     } finally {
       cluster.shutdown();
     }
@@ -995,11 +1011,12 @@ public class TestBlockStoragePolicy {
    * that file from 3 to 5. Make sure all replications are created in DISKS.
    */
   @Test
-  public void testIncreaseHotFileRep() throws Exception {
+  public void testChangeHotFileRep() throws Exception {
-    testIncreaseFileRep("HOT", HOT, new StorageType[]{StorageType.DISK,
+    testChangeFileRep("HOT", HOT,
-            StorageType.DISK, StorageType.DISK},
         new StorageType[]{StorageType.DISK, StorageType.DISK,
-            StorageType.DISK, StorageType.DISK, StorageType.DISK});
+            StorageType.DISK},
+        new StorageType[]{StorageType.DISK, StorageType.DISK, StorageType.DISK,
+            StorageType.DISK, StorageType.DISK});
   }
 
   /**
@@ -1008,9 +1025,10 @@ public class TestBlockStoragePolicy {
    * and ARCHIVE.
    */
   @Test
-  public void testIncreaseWarmRep() throws Exception {
+  public void testChangeWarmRep() throws Exception {
-    testIncreaseFileRep("WARM", WARM, new StorageType[]{StorageType.DISK,
+    testChangeFileRep("WARM", WARM,
-        StorageType.ARCHIVE, StorageType.ARCHIVE},
+        new StorageType[]{StorageType.DISK, StorageType.ARCHIVE,
+            StorageType.ARCHIVE},
         new StorageType[]{StorageType.DISK, StorageType.ARCHIVE,
             StorageType.ARCHIVE, StorageType.ARCHIVE, StorageType.ARCHIVE});
   }
@@ -1020,9 +1038,10 @@ public class TestBlockStoragePolicy {
    * that file from 3 to 5. Make sure all replicas are created in ARCHIVE.
    */
   @Test
-  public void testIncreaseColdRep() throws Exception {
+  public void testChangeColdRep() throws Exception {
-    testIncreaseFileRep("COLD", COLD, new StorageType[]{StorageType.ARCHIVE,
+    testChangeFileRep("COLD", COLD,
-            StorageType.ARCHIVE, StorageType.ARCHIVE},
+        new StorageType[]{StorageType.ARCHIVE, StorageType.ARCHIVE,
+            StorageType.ARCHIVE},
         new StorageType[]{StorageType.ARCHIVE, StorageType.ARCHIVE,
             StorageType.ARCHIVE, StorageType.ARCHIVE, StorageType.ARCHIVE});
   }
@@ -1072,4 +1091,28 @@ public class TestBlockStoragePolicy {
     System.out.println(Arrays.asList(targets));
     Assert.assertEquals(3, targets.length);
   }
+
+  /**
+   * Test getting all the storage policies from the namenode
+   */
+  @Test
+  public void testGetAllStoragePolicies() throws Exception {
+    final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .numDataNodes(0).build();
+    cluster.waitActive();
+    final DistributedFileSystem fs = cluster.getFileSystem();
+    try {
+      BlockStoragePolicy[] policies = fs.getStoragePolicySuite();
+      Assert.assertEquals(3, policies.length);
+      Assert.assertEquals(POLICY_SUITE.getPolicy(COLD).toString(),
+          policies[0].toString());
+      Assert.assertEquals(POLICY_SUITE.getPolicy(WARM).toString(),
+          policies[1].toString());
+      Assert.assertEquals(POLICY_SUITE.getPolicy(HOT).toString(),
+          policies[2].toString());
+    } finally {
+      IOUtils.cleanup(null, fs);
+      cluster.shutdown();
+    }
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestStoragePolicyCommands.java

@@ -21,6 +21,8 @@ import java.io.IOException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -60,6 +62,11 @@ public class TestStoragePolicyCommands {
     final Path bar = new Path(foo, "bar");
     DFSTestUtil.createFile(fs, bar, SIZE, REPL, 0);
 
+    DFSTestUtil.DFSAdminRun("-getStoragePolicy /foo", 0,
+        "The storage policy of " + foo.toString() + " is unspecified", conf);
+    DFSTestUtil.DFSAdminRun("-getStoragePolicy /foo/bar", 0,
+        "The storage policy of " + bar.toString() + " is unspecified", conf);
+
     DFSTestUtil.DFSAdminRun("-setStoragePolicy /foo WARM", 0,
         "Set storage policy WARM on " + foo.toString(), conf);
     DFSTestUtil.DFSAdminRun("-setStoragePolicy /foo/bar COLD", 0,
@@ -67,8 +74,8 @@ public class TestStoragePolicyCommands {
     DFSTestUtil.DFSAdminRun("-setStoragePolicy /fooz WARM", -1,
         "File/Directory does not exist: /fooz", conf);
 
-    final BlockStoragePolicy.Suite suite = BlockStoragePolicy
+    final BlockStoragePolicySuite suite = BlockStoragePolicySuite
-        .readBlockStorageSuite(conf);
+        .createDefaultSuite();
     final BlockStoragePolicy warm = suite.getPolicy("WARM");
     final BlockStoragePolicy cold = suite.getPolicy("COLD");
     DFSTestUtil.DFSAdminRun("-getStoragePolicy /foo", 0,

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/mover/TestStorageMover.java

@@ -36,7 +36,7 @@ import org.apache.hadoop.conf.ReconfigurationException;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSOutputStream;
 import org.apache.hadoop.hdfs.DFSTestUtil;
@@ -56,6 +56,7 @@ import org.apache.hadoop.hdfs.server.balancer.Dispatcher;
 import org.apache.hadoop.hdfs.server.balancer.ExitStatus;
 import org.apache.hadoop.hdfs.server.balancer.TestBalancer;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
@@ -87,7 +88,7 @@ public class TestStorageMover {
   private static final short REPL = 3;
   private static final int NUM_DATANODES = 6;
   private static final Configuration DEFAULT_CONF = new HdfsConfiguration();
-  private static final BlockStoragePolicy.Suite DEFAULT_POLICIES;
+  private static final BlockStoragePolicySuite DEFAULT_POLICIES;
   private static final BlockStoragePolicy HOT;
   private static final BlockStoragePolicy WARM;
   private static final BlockStoragePolicy COLD;
@@ -99,7 +100,7 @@ public class TestStorageMover {
         2L);
     DEFAULT_CONF.setLong(DFSConfigKeys.DFS_MOVER_MOVEDWINWIDTH_KEY, 2000L);
 
-    DEFAULT_POLICIES = BlockStoragePolicy.readBlockStorageSuite(DEFAULT_CONF);
+    DEFAULT_POLICIES = BlockStoragePolicySuite.createDefaultSuite();
     HOT = DEFAULT_POLICIES.getPolicy("HOT");
     WARM = DEFAULT_POLICIES.getPolicy("WARM");
     COLD = DEFAULT_POLICIES.getPolicy("COLD");
@@ -192,13 +193,21 @@ public class TestStorageMover {
 
     private MiniDFSCluster cluster;
     private DistributedFileSystem dfs;
-    private final BlockStoragePolicy.Suite policies;
+    private final BlockStoragePolicySuite policies;
 
     MigrationTest(ClusterScheme cScheme, NamespaceScheme nsScheme) {
       this.clusterScheme = cScheme;
       this.nsScheme = nsScheme;
       this.conf = clusterScheme.conf;
-      this.policies = BlockStoragePolicy.readBlockStorageSuite(conf);
+      this.policies = DEFAULT_POLICIES;
+    }
+
+    MigrationTest(ClusterScheme cScheme, NamespaceScheme nsScheme,
+        BlockStoragePolicySuite policies) {
+      this.clusterScheme = cScheme;
+      this.nsScheme = nsScheme;
+      this.conf = clusterScheme.conf;
+      this.policies = policies;
     }
 
     /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeleteRace.java

@@ -29,7 +29,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.AppendTestUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;