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From cmcc...@apache.org
Subject git commit: HDFS-7278. Add a command that allows sysadmins to manually trigger full block reports from a DN (cmccabe) (cherry picked from commit baf794dc404ac54f4e8332654eadfac1bebacb8f)
Date Mon, 27 Oct 2014 17:13:42 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 8d781aaad -> 5f3d967aa


HDFS-7278. Add a command that allows sysadmins to manually trigger full block reports from
a DN (cmccabe)
(cherry picked from commit baf794dc404ac54f4e8332654eadfac1bebacb8f)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/5f3d967a
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/5f3d967a
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/5f3d967a

Branch: refs/heads/branch-2
Commit: 5f3d967aaefa0b20ef1586b4048b8fa5345d2618
Parents: 8d781aa
Author: Colin Patrick Mccabe <cmccabe@cloudera.com>
Authored: Mon Oct 27 09:53:16 2014 -0700
Committer: Colin Patrick Mccabe <cmccabe@cloudera.com>
Committed: Mon Oct 27 10:13:32 2014 -0700

----------------------------------------------------------------------
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt     |   3 +
 .../hadoop/hdfs/client/BlockReportOptions.java  |  59 +++++++++
 .../hdfs/protocol/ClientDatanodeProtocol.java   |   7 +
 ...tDatanodeProtocolServerSideTranslatorPB.java |  18 +++
 .../ClientDatanodeProtocolTranslatorPB.java     |  16 +++
 .../hdfs/server/datanode/BPServiceActor.java    |  17 +++
 .../hadoop/hdfs/server/datanode/DataNode.java   |  14 ++
 .../org/apache/hadoop/hdfs/tools/DFSAdmin.java  |  53 ++++++++
 .../src/main/proto/ClientDatanodeProtocol.proto |  10 ++
 .../src/site/apt/HDFSCommands.apt.vm            |   8 +-
 .../server/datanode/TestTriggerBlockReport.java | 131 +++++++++++++++++++
 11 files changed, 335 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index c2a87a7..78b058d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -5,6 +5,9 @@ Release 2.7.0 - UNRELEASED
   INCOMPATIBLE CHANGES
 
   NEW FEATURES
+    
+    HDFS-7278. Add a command that allows sysadmins to manually trigger full
+    block reports from a DN (cmccabe)
 
   IMPROVEMENTS
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/BlockReportOptions.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/BlockReportOptions.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/BlockReportOptions.java
new file mode 100644
index 0000000..07f4836
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/BlockReportOptions.java
@@ -0,0 +1,59 @@
+/**
+ * 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.client;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+/**
+ * Options that can be specified when manually triggering a block report.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public final class BlockReportOptions {
+  private final boolean incremental;
+
+  private BlockReportOptions(boolean incremental) {
+    this.incremental = incremental;
+  }
+
+  public boolean isIncremental() {
+    return incremental;
+  }
+
+  public static class Factory {
+    private boolean incremental = false;
+
+    public Factory() {
+    }
+
+    public Factory setIncremental(boolean incremental) {
+      this.incremental = incremental;
+      return this;
+    }
+
+    public BlockReportOptions build() {
+      return new BlockReportOptions(incremental);
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "BlockReportOptions{incremental=" + incremental + "}";
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java
index 9cd5ccd..1dcc196 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java
@@ -25,6 +25,7 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.ReconfigurationTaskStatus;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenSelector;
@@ -158,4 +159,10 @@ public interface ClientDatanodeProtocol {
    * @see {@link org.apache.hadoop.conf.ReconfigurationTaskStatus}.
    */
   ReconfigurationTaskStatus getReconfigurationStatus() throws IOException;
+
+  /**
+   * Trigger a new block report.
+   */
+  void triggerBlockReport(BlockReportOptions options)
+    throws IOException;
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolServerSideTranslatorPB.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolServerSideTranslatorPB.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolServerSideTranslatorPB.java
index ed7f0ae..5c2c4a7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolServerSideTranslatorPB.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolServerSideTranslatorPB.java
@@ -26,6 +26,7 @@ import com.google.common.base.Optional;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.ReconfigurationTaskStatus;
 import org.apache.hadoop.conf.ReconfigurationUtil.PropertyChange;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
 import org.apache.hadoop.hdfs.protocol.HdfsBlocksMetadata;
@@ -49,6 +50,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.Shutdo
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.ShutdownDatanodeResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.StartReconfigurationRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.StartReconfigurationResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.TriggerBlockReportRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.TriggerBlockReportResponseProto;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.security.proto.SecurityProtos.TokenProto;
 import org.apache.hadoop.security.token.Token;
@@ -74,6 +77,8 @@ public class ClientDatanodeProtocolServerSideTranslatorPB implements
       ShutdownDatanodeResponseProto.newBuilder().build();
   private final static StartReconfigurationResponseProto START_RECONFIG_RESP =
       StartReconfigurationResponseProto.newBuilder().build();
+  private final static TriggerBlockReportResponseProto TRIGGER_BLOCK_REPORT_RESP =
+      TriggerBlockReportResponseProto.newBuilder().build();
   
   private final ClientDatanodeProtocol impl;
 
@@ -237,4 +242,17 @@ public class ClientDatanodeProtocolServerSideTranslatorPB implements
     }
     return builder.build();
   }
+
+  @Override
+  public TriggerBlockReportResponseProto triggerBlockReport(
+      RpcController unused, TriggerBlockReportRequestProto request)
+          throws ServiceException {
+    try {
+      impl.triggerBlockReport(new BlockReportOptions.Factory().
+          setIncremental(request.getIncremental()).build());
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return TRIGGER_BLOCK_REPORT_RESP;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolTranslatorPB.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolTranslatorPB.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolTranslatorPB.java
index 00b6ad7..f1a1b24 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolTranslatorPB.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientDatanodeProtocolTranslatorPB.java
@@ -36,6 +36,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.ReconfigurationTaskStatus;
 import org.apache.hadoop.conf.ReconfigurationUtil.PropertyChange;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
@@ -57,6 +58,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.GetRec
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.GetReconfigurationStatusConfigChangeProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.ShutdownDatanodeRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.StartReconfigurationRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.TriggerBlockReportRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos.TriggerBlockReportResponseProto;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.ipc.ProtobufHelper;
 import org.apache.hadoop.ipc.ProtobufRpcEngine;
@@ -333,4 +336,17 @@ public class ClientDatanodeProtocolTranslatorPB implements
     }
     return new ReconfigurationTaskStatus(startTime, endTime, statusMap);
   }
+
+  @Override
+  public void triggerBlockReport(BlockReportOptions options)
+      throws IOException {
+    try {
+      rpcProxy.triggerBlockReport(NULL_CONTROLLER,
+          TriggerBlockReportRequestProto.newBuilder().
+            setIncremental(options.isIncremental()).
+            build());
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
index 2961698..d94d056 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
@@ -28,6 +28,7 @@ import com.google.common.base.Joiner;
 import org.apache.commons.logging.Log;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
@@ -986,4 +987,20 @@ class BPServiceActor implements Runnable {
       return (pendingIncrementalBR.remove(blockInfo.getBlock().getBlockId()) != null);
     }
   }
+
+  void triggerBlockReport(BlockReportOptions options) throws IOException {
+    if (options.isIncremental()) {
+      LOG.info(bpos.toString() + ": scheduling an incremental block report.");
+      synchronized(pendingIncrementalBRperStorage) {
+        sendImmediateIBR = true;
+        pendingIncrementalBRperStorage.notifyAll();
+      }
+    } else {
+      LOG.info(bpos.toString() + ": scheduling a full block report.");
+      synchronized(pendingIncrementalBRperStorage) {
+        lastBlockReport = 0;
+        pendingIncrementalBRperStorage.notifyAll();
+      }
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
index f10be62..7198c87 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
@@ -96,6 +96,7 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.LocalFileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DFSUtil.ConfiguredNNAddress;
@@ -2908,6 +2909,19 @@ public class DataNode extends ReconfigurableBase
     return getReconfigurationTaskStatus();
   }
 
+  @Override // ClientDatanodeProtocol
+  public void triggerBlockReport(BlockReportOptions options)
+      throws IOException {
+    checkSuperuserPrivilege();
+    for (BPOfferService bpos : blockPoolManager.getAllNamenodeThreads()) {
+      if (bpos != null) {
+        for (BPServiceActor actor : bpos.getBPServiceActors()) {
+          actor.triggerBlockReport(options);
+        }
+      }
+    }
+  }
+
   /**
    * @param addr rpc address of the namenode
    * @return true if the datanode is connected to a NameNode at the

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
index 041bc3d..04d43a9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
@@ -31,10 +31,12 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeSet;
 
+import com.google.common.base.Joiner;
 import com.google.common.base.Optional;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -49,6 +51,7 @@ 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.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
@@ -396,6 +399,7 @@ public class DFSAdmin extends FsShell {
     "\t[-metasave filename]\n" +
     "\t[-setStoragePolicy path policyName]\n" +
     "\t[-getStoragePolicy path]\n" +
+    "\t[-triggerBlockReport [-incremental] <datanode_host:ipc_port>]\n" +
     "\t[-help [cmd]]\n";
 
   /**
@@ -630,6 +634,38 @@ public class DFSAdmin extends FsShell {
     throw new IOException("Cannot identify the storage policy for " + argv[1]);
   }
 
+  public int triggerBlockReport(String[] argv) throws IOException {
+    List<String> args = new LinkedList<String>();
+    for (int j = 1; j < argv.length; j++) {
+      args.add(argv[j]);
+    }
+    boolean incremental = StringUtils.popOption("-incremental", args);
+    String hostPort = StringUtils.popFirstNonOption(args);
+    if (hostPort == null) {
+      System.err.println("You must specify a host:port pair.");
+      return 1;
+    }
+    if (!args.isEmpty()) {
+      System.err.print("Can't understand arguments: " +
+        Joiner.on(" ").join(args) + "\n");
+      return 1;
+    }
+    ClientDatanodeProtocol dnProxy = getDataNodeProxy(hostPort);
+    try {
+      dnProxy.triggerBlockReport(
+          new BlockReportOptions.Factory().
+              setIncremental(incremental).
+              build());
+    } catch (IOException e) {
+      System.err.println("triggerBlockReport error: " + e);
+      return 1;
+    }
+    System.out.println("Triggering " +
+        (incremental ? "an incremental " : "a full ") +
+        "block report on " + hostPort + ".");
+    return 0;
+  }
+
   /**
    * Allow snapshot on a directory.
    * Usage: java DFSAdmin -allowSnapshot snapshotDir
@@ -983,6 +1019,12 @@ public class DFSAdmin extends FsShell {
     String getStoragePolicy = "-getStoragePolicy path\n"
         + "\tGet the storage policy for a file/directory.\n";
 
+    String triggerBlockReport =
+      "-triggerBlockReport [-incremental] <datanode_host:ipc_port>\n"
+        + "\tTrigger a block report for the datanode.\n"
+        + "\tIf 'incremental' is specified, it will be an incremental\n"
+        + "\tblock report; otherwise, it will be a full block report.\n";
+
     String help = "-help [cmd]: \tDisplays help for the given command or all commands if
none\n" +
       "\t\tis specified.\n";
 
@@ -1080,6 +1122,7 @@ public class DFSAdmin extends FsShell {
       System.out.println(getDatanodeInfo);
       System.out.println(setStoragePolicy);
       System.out.println(getStoragePolicy);
+      System.out.println(triggerBlockReport);
       System.out.println(help);
       System.out.println();
       ToolRunner.printGenericCommandUsage(System.out);
@@ -1593,6 +1636,9 @@ public class DFSAdmin extends FsShell {
     } else if ("-getDatanodeInfo".equals(cmd)) {
       System.err.println("Usage: hdfs dfsadmin"
           + " [-getDatanodeInfo <datanode_host:ipc_port>]");
+    } else if ("-triggerBlockReport".equals(cmd)) {
+      System.err.println("Usage: java DFSAdmin"
+          + " [-triggerBlockReport [-incremental] <datanode_host:ipc_port>]");
     } else {
       System.err.println("Usage: hdfs dfsadmin");
       System.err.println("Note: Administrative commands can only be run as the HDFS superuser.");
@@ -1736,6 +1782,11 @@ public class DFSAdmin extends FsShell {
         printUsage(cmd);
         return exitCode;
       }
+    } else if ("-triggerBlockReport".equals(cmd)) {
+      if (argv.length < 1) {
+        printUsage(cmd);
+        return exitCode;
+      }
     } else if ("-getStoragePolicy".equals(cmd)) {
       if (argv.length != 2) {
         printUsage(cmd);
@@ -1818,6 +1869,8 @@ public class DFSAdmin extends FsShell {
         exitCode = setStoragePolicy(argv);
       } else if ("-getStoragePolicy".equals(cmd)) {
         exitCode = getStoragePolicy(argv);
+      } else if ("-triggerBlockReport".equals(cmd)) {
+        exitCode = triggerBlockReport(argv);
       } else if ("-help".equals(cmd)) {
         if (i < argv.length) {
           printHelp(argv[i]);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientDatanodeProtocol.proto
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientDatanodeProtocol.proto b/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientDatanodeProtocol.proto
index 61f787b..48f6dd1 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientDatanodeProtocol.proto
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientDatanodeProtocol.proto
@@ -156,6 +156,13 @@ message StartReconfigurationRequestProto {
 message StartReconfigurationResponseProto {
 }
 
+message TriggerBlockReportRequestProto {
+  required bool incremental = 1;
+}
+
+message TriggerBlockReportResponseProto {
+}
+
 /** Query the running status of reconfiguration process */
 message GetReconfigurationStatusRequestProto {
 }
@@ -222,4 +229,7 @@ service ClientDatanodeProtocolService {
 
   rpc startReconfiguration(StartReconfigurationRequestProto)
       returns(StartReconfigurationResponseProto);
+
+  rpc triggerBlockReport(TriggerBlockReportRequestProto)
+      returns(TriggerBlockReportResponseProto);
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm b/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
index 8a212d1..1c5f79d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
@@ -201,6 +201,7 @@ HDFS Commands Guide
           [-fetchImage <local directory>]
           [-shutdownDatanode <datanode_host:ipc_port> [upgrade]]
           [-getDatanodeInfo <datanode_host:ipc_port>]
+          [-triggerBlockReport [-incremental] <datanode_host:ipc_port>]
           [-help [cmd]]
 +------------------------------------------+
 
@@ -285,7 +286,7 @@ HDFS Commands Guide
                   | of the resource specified by \<key\> on \<host:ipc_port\>.
                   | All other args after are sent to the host.
 *-----------------+-----------------------------------------------------------+
-| -reconfig <datanode|...> <host:ipc_port> <start|status> | Start
+| -reconfig \<datanode\|...\> \<host:ipc_port\> \<start\|status\> | Start
                   | reconfiguration or get the status of an ongoing
                   | reconfiguration. The second parameter specifies the node
                   | type. Currently, only reloading DataNode's configuration is
@@ -334,6 +335,11 @@ HDFS Commands Guide
                   | {{{./HdfsRollingUpgrade.html#dfsadmin_-getDatanodeInfo}Rolling Upgrade
document}}
                   | for the detail.
 *-----------------+-----------------------------------------------------------+
+| -triggerBlockReport [-incremental] \<datanode_host:ipc_port\> | Trigger a
+                  | block report for the given datanode.  If 'incremental' is
+                  | specified, it will be | an incremental block report;
+                  | otherwise, it will be a full block report.
+*-----------------+-----------------------------------------------------------+
 | -help [cmd]     | Displays help for the given command or all commands if none
                   | is specified.
 *-----------------+-----------------------------------------------------------+

http://git-wip-us.apache.org/repos/asf/hadoop/blob/5f3d967a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestTriggerBlockReport.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestTriggerBlockReport.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestTriggerBlockReport.java
new file mode 100644
index 0000000..efb9d98
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestTriggerBlockReport.java
@@ -0,0 +1,131 @@
+/**
+ * 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.datanode;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.timeout;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.client.BlockReportOptions;
+import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
+import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
+import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo.BlockStatus;
+import org.apache.hadoop.hdfs.server.protocol.StorageBlockReport;
+import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+/**
+ * Test manually requesting that the DataNode send a block report.
+ */
+public final class TestTriggerBlockReport {
+  private void testTriggerBlockReport(boolean incremental) throws Exception {
+    Configuration conf = new HdfsConfiguration();
+
+    // Set a really long value for dfs.blockreport.intervalMsec and
+    // dfs.heartbeat.interval, so that incremental block reports and heartbeats
+    // won't be sent during this test unless they're triggered
+    // manually.
+    conf.setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 10800000L);
+    conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1080L);
+
+    final MiniDFSCluster cluster =
+        new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
+    cluster.waitActive();
+    FileSystem fs = cluster.getFileSystem();
+    DatanodeProtocolClientSideTranslatorPB spy =
+        DataNodeTestUtils.spyOnBposToNN(
+            cluster.getDataNodes().get(0), cluster.getNameNode());
+    DFSTestUtil.createFile(fs, new Path("/abc"), 16, (short) 1, 1L);
+
+    // We should get 1 incremental block report.
+    Mockito.verify(spy, timeout(60000).times(1)).blockReceivedAndDeleted(
+        any(DatanodeRegistration.class),
+        anyString(),
+        any(StorageReceivedDeletedBlocks[].class));
+
+    // We should not receive any more incremental or incremental block reports,
+    // since the interval we configured is so long.
+    for (int i = 0; i < 3; i++) {
+      Thread.sleep(10);
+      Mockito.verify(spy, times(0)).blockReport(
+          any(DatanodeRegistration.class),
+          anyString(),
+          any(StorageBlockReport[].class));
+      Mockito.verify(spy, times(1)).blockReceivedAndDeleted(
+          any(DatanodeRegistration.class),
+          anyString(),
+          any(StorageReceivedDeletedBlocks[].class));
+    }
+
+    // Create a fake block deletion notification on the DataNode.
+    // This will be sent with the next incremental block report.
+    ReceivedDeletedBlockInfo rdbi = new ReceivedDeletedBlockInfo(
+        new Block(5678, 512, 1000),  BlockStatus.DELETED_BLOCK, null);
+    DataNode datanode = cluster.getDataNodes().get(0);
+    BPServiceActor actor =
+        datanode.getAllBpOs()[0].getBPServiceActors().get(0);
+    String storageUuid =
+        datanode.getFSDataset().getVolumes().get(0).getStorageID();
+    actor.notifyNamenodeDeletedBlock(rdbi, storageUuid);
+
+    // Manually trigger a block report.
+    datanode.triggerBlockReport(
+        new BlockReportOptions.Factory().
+            setIncremental(incremental).
+            build()
+    );
+
+    // triggerBlockReport returns before the block report is
+    // actually sent.  Wait for it to be sent here.
+    if (incremental) {
+      Mockito.verify(spy, timeout(60000).times(2)).
+          blockReceivedAndDeleted(
+              any(DatanodeRegistration.class),
+              anyString(),
+              any(StorageReceivedDeletedBlocks[].class));
+    } else {
+      Mockito.verify(spy, timeout(60000)).blockReport(
+          any(DatanodeRegistration.class),
+          anyString(),
+          any(StorageBlockReport[].class));
+    }
+
+    cluster.shutdown();
+  }
+
+  @Test
+  public void testTriggerFullBlockReport() throws Exception {
+    testTriggerBlockReport(false);
+  }
+
+  @Test
+  public void testTriggerIncrementalBlockReport() throws Exception {
+    testTriggerBlockReport(true);
+  }
+}


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