HDFS-7140. Add a tool to list all the existing block storage policies. Contributed by Jing Zhao.

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

@@ -345,6 +345,9 @@ Trunk (Unreleased)
     HDFS-7081. Add new DistributedFileSystem API for getting all the existing
     storage policies. (jing9)
 
+    HDFS-7140. Add a tool to list all the existing block storage policies.
+    (jing9)
+
 Release 2.6.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs

@@ -48,6 +48,7 @@ function hadoop_usage
   echo "  secondarynamenode    run the DFS secondary namenode"
   echo "  snapshotDiff         diff two snapshots of a directory or diff the"
   echo "                       current directory contents with a snapshot"
+  echo "  storagepolicies      get all the existing block storage policies"
   echo "  zkfc                 run the ZK Failover Controller daemon"
   echo ""
   echo "Most commands print help when invoked w/o parameters."
@@ -216,6 +217,9 @@ case ${COMMAND} in
   snapshotDiff)
     CLASS=org.apache.hadoop.hdfs.tools.snapshot.SnapshotDiff
   ;;
+  storagepolicies)
+    CLASS=org.apache.hadoop.hdfs.tools.GetStoragePolicies
+  ;;
   zkfc)
     daemon="true"
     CLASS='org.apache.hadoop.hdfs.tools.DFSZKFailoverController'

hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs.cmd

@@ -47,7 +47,7 @@ if "%1" == "--config" (
       goto print_usage
   )
 
-  set hdfscommands=dfs namenode secondarynamenode journalnode zkfc datanode dfsadmin haadmin fsck balancer jmxget oiv oev fetchdt getconf groups snapshotDiff lsSnapshottableDir cacheadmin mover
+  set hdfscommands=dfs namenode secondarynamenode journalnode zkfc datanode dfsadmin haadmin fsck balancer jmxget oiv oev fetchdt getconf groups snapshotDiff lsSnapshottableDir cacheadmin mover storagepolicies
   for %%i in ( %hdfscommands% ) do (
     if %hdfs-command% == %%i set hdfscommand=true
   )
@@ -155,6 +155,10 @@ goto :eof
   set HADOOP_OPTS=%HADOOP_OPTS% %HADOOP_MOVER_OPTS%
   goto :eof
 
+:storagepolicies
+  set CLASS=org.apache.hadoop.hdfs.tools.GetStoragePolicies
+  goto :eof
+
 @rem This changes %1, %2 etc. Hence those cannot be used after calling this.
 :make_command_arguments
   if "%1" == "--config" (
@@ -204,6 +208,7 @@ goto :eof
   @echo 						Use -help to see options
   @echo   cacheadmin           configure the HDFS cache
   @echo   mover                run a utility to move block replicas across storage types
+  @echo   storagepolicies      get all the existing block storage policies
   @echo.
   @echo Most commands print help when invoked w/o parameters.
 

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

@@ -1783,8 +1783,8 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
   /**
    * @return All the existing storage policies
    */
-  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+  public BlockStoragePolicy[] getStoragePolicies() throws IOException {
-    return namenode.getStoragePolicySuite();
+    return namenode.getStoragePolicies();
   }
 
   /**

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

@@ -506,9 +506,9 @@ public class DistributedFileSystem extends FileSystem {
   }
 
   /** Get all the existing storage policies */
-  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+  public BlockStoragePolicy[] getStoragePolicies() throws IOException {
     statistics.incrementReadOps(1);
-    return dfs.getStoragePolicySuite();
+    return dfs.getStoragePolicies();
   }
 
   /**

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

@@ -209,7 +209,7 @@ public class BlockStoragePolicy {
     return getClass().getSimpleName() + "{" + name + ":" + id
         + ", storageTypes=" + Arrays.asList(storageTypes)
         + ", creationFallbacks=" + Arrays.asList(creationFallbacks)
-        + ", replicationFallbacks=" + Arrays.asList(replicationFallbacks);
+        + ", replicationFallbacks=" + Arrays.asList(replicationFallbacks) + "}";
   }
 
   public byte getId() {

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

@@ -43,13 +43,11 @@ import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.hdfs.inotify.Event;
 import org.apache.hadoop.hdfs.inotify.EventsList;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
 import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenSelector;
-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;
@@ -264,7 +262,7 @@ public interface ClientProtocol {
    * @return All the in-use block storage policies currently.
    */
   @Idempotent
-  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException;
+  public BlockStoragePolicy[] getStoragePolicies() throws IOException;
 
   /**
    * Set the storage policy for a file/directory

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

@@ -120,8 +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.GetStoragePoliciesRequestProto;
-import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePoliciesResponseProto;
 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;
@@ -1433,13 +1433,13 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
   }
 
   @Override
-  public GetStoragePolicySuiteResponseProto getStoragePolicySuite(
+  public GetStoragePoliciesResponseProto getStoragePolicies(
-      RpcController controller, GetStoragePolicySuiteRequestProto request)
+      RpcController controller, GetStoragePoliciesRequestProto request)
       throws ServiceException {
     try {
-      BlockStoragePolicy[] policies = server.getStoragePolicySuite();
+      BlockStoragePolicy[] policies = server.getStoragePolicies();
-      GetStoragePolicySuiteResponseProto.Builder builder =
+      GetStoragePoliciesResponseProto.Builder builder =
-          GetStoragePolicySuiteResponseProto.newBuilder();
+          GetStoragePoliciesResponseProto.newBuilder();
       if (policies == null) {
         return builder.build();
       }

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

@@ -118,8 +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.GetStoragePoliciesRequestProto;
-import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePolicySuiteResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetStoragePoliciesResponseProto;
 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;
@@ -226,9 +226,9 @@ public class ClientNamenodeProtocolTranslatorPB implements
   VOID_GET_DATA_ENCRYPTIONKEY_REQUEST =
       GetDataEncryptionKeyRequestProto.newBuilder().build();
 
-  private final static GetStoragePolicySuiteRequestProto
+  private final static GetStoragePoliciesRequestProto
-  VOID_GET_STORAGE_POLICY_SUITE_REQUEST =
+  VOID_GET_STORAGE_POLICIES_REQUEST =
-      GetStoragePolicySuiteRequestProto.newBuilder().build();
+      GetStoragePoliciesRequestProto.newBuilder().build();
 
   public ClientNamenodeProtocolTranslatorPB(ClientNamenodeProtocolPB proxy) {
     rpcProxy = proxy;
@@ -1456,10 +1456,10 @@ public class ClientNamenodeProtocolTranslatorPB implements
   }
 
   @Override
-  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+  public BlockStoragePolicy[] getStoragePolicies() throws IOException {
     try {
-      GetStoragePolicySuiteResponseProto response = rpcProxy
+      GetStoragePoliciesResponseProto response = rpcProxy
-          .getStoragePolicySuite(null, VOID_GET_STORAGE_POLICY_SUITE_REQUEST);
+          .getStoragePolicies(null, VOID_GET_STORAGE_POLICIES_REQUEST);
       return PBHelper.convertStoragePolicies(response.getPoliciesList());
     } catch (ServiceException e) {
       throw ProtobufHelper.getRemoteException(e);

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

@@ -402,7 +402,7 @@ public class BlockManager {
     return storagePolicySuite.getPolicy(policyName);
   }
 
-  public BlockStoragePolicy[] getStoragePolicySuite() {
+  public BlockStoragePolicy[] getStoragePolicies() {
     return storagePolicySuite.getAllPolicies();
   }
 

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

@@ -142,7 +142,7 @@ public class Mover {
 
   private void initStoragePolicies() throws IOException {
     BlockStoragePolicy[] policies = dispatcher.getDistributedFileSystem()
-        .getStoragePolicySuite();
+        .getStoragePolicies();
     for (BlockStoragePolicy policy : policies) {
       this.blockStoragePolicies[policy.getId()] = policy;
     }
@@ -387,8 +387,8 @@ public class Mover {
     boolean scheduleMoveReplica(DBlock db, MLocation ml,
                                 List<StorageType> targetTypes) {
       final Source source = storages.getSource(ml);
-      return source == null ? false : scheduleMoveReplica(db,
+      return source == null ? false : scheduleMoveReplica(db, source,
-          storages.getSource(ml), targetTypes);
+          targetTypes);
     }
 
     boolean scheduleMoveReplica(DBlock db, Source source,

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

@@ -2304,13 +2304,13 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
   /**
    * @return All the existing block storage policies
    */
-  BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+  BlockStoragePolicy[] getStoragePolicies() throws IOException {
     checkOperation(OperationCategory.READ);
     waitForLoadingFSImage();
     readLock();
     try {
       checkOperation(OperationCategory.READ);
-      return blockManager.getStoragePolicySuite();
+      return blockManager.getStoragePolicies();
     } finally {
       readUnlock();
     }

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

@@ -594,8 +594,8 @@ class NameNodeRpcServer implements NamenodeProtocols {
   }
 
   @Override
-  public BlockStoragePolicy[] getStoragePolicySuite() throws IOException {
+  public BlockStoragePolicy[] getStoragePolicies() throws IOException {
-    return namesystem.getStoragePolicySuite();
+    return namesystem.getStoragePolicies();
   }
 
   @Override // ClientProtocol

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

@@ -614,7 +614,7 @@ public class DFSAdmin extends FsShell {
       System.out.println("The storage policy of " + argv[1] + " is unspecified");
       return 0;
     }
-    BlockStoragePolicy[] policies = dfs.getStoragePolicySuite();
+    BlockStoragePolicy[] policies = dfs.getStoragePolicies();
     for (BlockStoragePolicy p : policies) {
       if (p.getId() == storagePolicyId) {
         System.out.println("The storage policy of " + argv[1] + ":\n" + p);

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

@@ -0,0 +1,65 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.tools;
+
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.util.Tool;
+import org.apache.hadoop.util.ToolRunner;
+
+import java.io.IOException;
+
+/**
+ * A tool listing all the existing block storage policies. No argument is
+ * required when using this tool.
+ */
+public class GetStoragePolicies extends Configured implements Tool {
+
+  @Override
+  public int run(String[] args) throws Exception {
+    FileSystem fs = FileSystem.get(getConf());
+    if (!(fs instanceof DistributedFileSystem)) {
+      System.err.println("GetStoragePolicies can only be used against HDFS. " +
+          "Please check the default FileSystem setting in your configuration.");
+      return 1;
+    }
+    DistributedFileSystem dfs = (DistributedFileSystem) fs;
+
+    try {
+      BlockStoragePolicy[] policies = dfs.getStoragePolicies();
+      System.out.println("Block Storage Policies:");
+      for (BlockStoragePolicy policy : policies) {
+        if (policy != null) {
+          System.out.println("\t" + policy);
+        }
+      }
+    } catch (IOException e) {
+      String[] content = e.getLocalizedMessage().split("\n");
+      System.err.println("GetStoragePolicies: " + content[0]);
+      return 1;
+    }
+    return 0;
+  }
+
+  public static void main(String[] args) throws Exception {
+    int rc = ToolRunner.run(new GetStoragePolicies(), args);
+    System.exit(rc);
+  }
+}

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

@@ -108,10 +108,10 @@ message SetStoragePolicyRequestProto {
 message SetStoragePolicyResponseProto { // void response
 }
 
-message GetStoragePolicySuiteRequestProto { // void request
+message GetStoragePoliciesRequestProto { // void request
 }
 
-message GetStoragePolicySuiteResponseProto {
+message GetStoragePoliciesResponseProto {
   repeated BlockStoragePolicyProto policies = 1;
 }
 
@@ -706,8 +706,8 @@ service ClientNamenodeProtocol {
       returns(SetReplicationResponseProto);
   rpc setStoragePolicy(SetStoragePolicyRequestProto)
       returns(SetStoragePolicyResponseProto);
-  rpc getStoragePolicySuite(GetStoragePolicySuiteRequestProto)
+  rpc getStoragePolicies(GetStoragePoliciesRequestProto)
-      returns(GetStoragePolicySuiteResponseProto);
+      returns(GetStoragePoliciesResponseProto);
   rpc setPermission(SetPermissionRequestProto)
       returns(SetPermissionResponseProto);
   rpc setOwner(SetOwnerRequestProto) returns(SetOwnerResponseProto);

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

@@ -73,11 +73,14 @@ public class TestBlockStoragePolicy {
   public void testDefaultPolicies() {
     final Map<Byte, String> expectedPolicyStrings = new HashMap<Byte, String>();
     expectedPolicyStrings.put(COLD,
-        "BlockStoragePolicy{COLD:4, storageTypes=[ARCHIVE], creationFallbacks=[], replicationFallbacks=[]");
+        "BlockStoragePolicy{COLD:4, storageTypes=[ARCHIVE], " +
+            "creationFallbacks=[], replicationFallbacks=[]}");
     expectedPolicyStrings.put(WARM,
-        "BlockStoragePolicy{WARM:8, storageTypes=[DISK, ARCHIVE], creationFallbacks=[DISK, ARCHIVE], replicationFallbacks=[DISK, ARCHIVE]");
+        "BlockStoragePolicy{WARM:8, storageTypes=[DISK, ARCHIVE], " +
+            "creationFallbacks=[DISK, ARCHIVE], replicationFallbacks=[DISK, ARCHIVE]}");
     expectedPolicyStrings.put(HOT,
-        "BlockStoragePolicy{HOT:12, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]");
+        "BlockStoragePolicy{HOT:12, storageTypes=[DISK], " +
+            "creationFallbacks=[], replicationFallbacks=[ARCHIVE]}");
 
     for(byte i = 1; i < 16; i++) {
       final BlockStoragePolicy policy = POLICY_SUITE.getPolicy(i); 
@@ -1102,7 +1105,7 @@ public class TestBlockStoragePolicy {
     cluster.waitActive();
     final DistributedFileSystem fs = cluster.getFileSystem();
     try {
-      BlockStoragePolicy[] policies = fs.getStoragePolicySuite();
+      BlockStoragePolicy[] policies = fs.getStoragePolicies();
       Assert.assertEquals(3, policies.length);
       Assert.assertEquals(POLICY_SUITE.getPolicy(COLD).toString(),
           policies[0].toString());