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From whe...@apache.org
Subject svn commit: r1605180 - in /hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs: ./ src/main/java/org/apache/hadoop/hdfs/protocol/ src/main/java/org/apache/hadoop/hdfs/server/namenode/ src/main/java/org/apache/hadoop/hdfs/server/namenode/sna...
Date Tue, 24 Jun 2014 20:31:18 GMT
Author: wheat9
Date: Tue Jun 24 20:31:18 2014
New Revision: 1605180

URL: http://svn.apache.org/r1605180
Log:
HDFS-6593. Merge r1605169 from trunk.

Added:
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotDiffInfo.java
      - copied unchanged from r1605169, hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotDiffInfo.java
Modified:
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
    hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt (original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt Tue Jun 24
20:31:18 2014
@@ -219,6 +219,9 @@ Release 2.5.0 - UNRELEASED
 
     HDFS-6430. HTTPFS - Implement XAttr support. (Yi Liu via tucu)
 
+    HDFS-6593. Move SnapshotDiffInfo out of INodeDirectorySnapshottable.
+    (Jing Zhao via wheat9)
+
   OPTIMIZATIONS
 
     HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java
Tue Jun 24 20:31:18 2014
@@ -23,16 +23,14 @@ import java.util.List;
 
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.DFSUtil;
-import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
 
 import com.google.common.base.Objects;
 
 /**
  * This class represents to end users the difference between two snapshots of 
  * the same directory, or the difference between a snapshot of the directory and
- * its current state. Instead of capturing all the details of the diff, which 
- * is stored in {@link SnapshotDiffInfo}, this class only lists where the 
- * changes happened and their types.
+ * its current state. Instead of capturing all the details of the diff, this
+ * class only lists where the changes happened and their types.
  */
 public class SnapshotDiffReport {
   private final static String LINE_SEPARATOR = System.getProperty(

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
Tue Jun 24 20:31:18 2014
@@ -87,7 +87,18 @@ import static org.apache.hadoop.hdfs.DFS
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_SUPPORT_APPEND_KEY;
 import static org.apache.hadoop.util.Time.now;
 
-import java.io.*;
+import java.io.BufferedWriter;
+import java.io.ByteArrayInputStream;
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.lang.management.ManagementFactory;
 import java.net.InetAddress;
 import java.net.URI;
@@ -173,7 +184,6 @@ import org.apache.hadoop.hdfs.protocol.R
 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.SnapshotDiffReport.DiffReportEntry;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
 import org.apache.hadoop.hdfs.protocol.datatransfer.ReplaceDatanodeOnFailure;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
@@ -211,7 +221,6 @@ import org.apache.hadoop.hdfs.server.nam
 import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMBean;
 import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable;
-import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager;
 import org.apache.hadoop.hdfs.server.namenode.startupprogress.Phase;
@@ -7483,7 +7492,7 @@ public class FSNamesystem implements Nam
    */
   SnapshotDiffReport getSnapshotDiffReport(String path,
       String fromSnapshot, String toSnapshot) throws IOException {
-    SnapshotDiffInfo diffs = null;
+    SnapshotDiffReport diffs;
     checkOperation(OperationCategory.READ);
     final FSPermissionChecker pc = getPermissionChecker();
     readLock();
@@ -7497,13 +7506,11 @@ public class FSNamesystem implements Nam
     } finally {
       readUnlock();
     }
-    
+
     if (auditLog.isInfoEnabled() && isExternalInvocation()) {
       logAuditEvent(true, "computeSnapshotDiff", null, null, null);
     }
-    return diffs != null ? diffs.generateReport() : new SnapshotDiffReport(
-        path, fromSnapshot, toSnapshot,
-        Collections.<DiffReportEntry> emptyList());
+    return diffs;
   }
   
   private void checkSubtreeReadPermission(final FSPermissionChecker pc,

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java
Tue Jun 24 20:31:18 2014
@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.server.na
 import java.io.DataOutput;
 import java.io.IOException;
 import java.util.ArrayDeque;
-import java.util.ArrayList;
 import java.util.Deque;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -29,8 +28,6 @@ import java.util.Map;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
-import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
-import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffType;
 import org.apache.hadoop.hdfs.server.namenode.Content;
 import org.apache.hadoop.hdfs.server.namenode.ContentSummaryComputationContext;
 import org.apache.hadoop.hdfs.server.namenode.FSImageSerialization;
@@ -41,7 +38,6 @@ import org.apache.hadoop.hdfs.server.nam
 import org.apache.hadoop.hdfs.server.namenode.INodeFile;
 import org.apache.hadoop.hdfs.server.namenode.INodeReference;
 import org.apache.hadoop.hdfs.server.namenode.Quota;
-import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo.RenameEntry;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotFSImageFormat.ReferenceMap;
 import org.apache.hadoop.hdfs.util.Diff;
 import org.apache.hadoop.hdfs.util.Diff.Container;
@@ -161,43 +157,6 @@ public class DirectoryWithSnapshotFeatur
         }
       }
     }
-
-    /**
-     * Interpret the diff and generate a list of {@link DiffReportEntry}.
-     * @param parentPath The relative path of the parent.
-     * @param fromEarlier True indicates {@code diff=later-earlier},
-     *                    False indicates {@code diff=earlier-later}
-     * @return A list of {@link DiffReportEntry} as the diff report.
-     */
-    public List<DiffReportEntry> generateReport(byte[][] parentPath,
-        boolean fromEarlier, Map<Long, RenameEntry> renameMap) {
-      List<DiffReportEntry> list = new ArrayList<DiffReportEntry>();
-      List<INode> created = getList(ListType.CREATED);
-      List<INode> deleted = getList(ListType.DELETED);
-      byte[][] fullPath = new byte[parentPath.length + 1][];
-      System.arraycopy(parentPath, 0, fullPath, 0, parentPath.length);
-      for (INode cnode : created) {
-        RenameEntry entry = renameMap.get(cnode.getId());
-        if (entry == null || !entry.isRename()) {
-          fullPath[fullPath.length - 1] = cnode.getLocalNameBytes();
-          list.add(new DiffReportEntry(fromEarlier ? DiffType.CREATE
-              : DiffType.DELETE, fullPath));
-        }
-      }
-      for (INode dnode : deleted) {
-        RenameEntry entry = renameMap.get(dnode.getId());
-        if (entry != null && entry.isRename()) {
-          list.add(new DiffReportEntry(DiffType.RENAME,
-              fromEarlier ? entry.getSourcePath() : entry.getTargetPath(),
-              fromEarlier ? entry.getTargetPath() : entry.getSourcePath()));
-        } else {
-          fullPath[fullPath.length - 1] = dnode.getLocalNameBytes();
-          list.add(new DiffReportEntry(fromEarlier ? DiffType.DELETE
-              : DiffType.CREATE, fullPath));
-        }
-      }
-      return list;
-    }
   }
 
   /**

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
Tue Jun 24 20:31:18 2014
@@ -21,22 +21,14 @@ import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
-import java.util.Map;
-import java.util.SortedMap;
-import java.util.TreeMap;
 
 import org.apache.hadoop.HadoopIllegalArgumentException;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
-import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
-import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
-import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffType;
 import org.apache.hadoop.hdfs.protocol.SnapshotException;
 import org.apache.hadoop.hdfs.server.namenode.Content;
 import org.apache.hadoop.hdfs.server.namenode.ContentSummaryComputationContext;
@@ -56,7 +48,6 @@ import org.apache.hadoop.util.Time;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
-import com.google.common.primitives.SignedBytes;
 
 /**
  * Directories where taking snapshots is allowed.
@@ -79,164 +70,6 @@ public class INodeDirectorySnapshottable
     }
     return (INodeDirectorySnapshottable)dir;
   }
-  
-  /**
-   * A class describing the difference between snapshots of a snapshottable
-   * directory.
-   */
-  public static class SnapshotDiffInfo {
-    /** Compare two inodes based on their full names */
-    public static final Comparator<INode> INODE_COMPARATOR = 
-        new Comparator<INode>() {
-      @Override
-      public int compare(INode left, INode right) {
-        if (left == null) {
-          return right == null ? 0 : -1;
-        } else {
-          if (right == null) {
-            return 1;
-          } else {
-            int cmp = compare(left.getParent(), right.getParent());
-            return cmp == 0 ? SignedBytes.lexicographicalComparator().compare(
-                left.getLocalNameBytes(), right.getLocalNameBytes()) : cmp;
-          }
-        }
-      }
-    };
-
-    static class RenameEntry {
-      private byte[][] sourcePath;
-      private byte[][] targetPath;
-
-      void setSource(INode source, byte[][] sourceParentPath) {
-        Preconditions.checkState(sourcePath == null);
-        sourcePath = new byte[sourceParentPath.length + 1][];
-        System.arraycopy(sourceParentPath, 0, sourcePath, 0,
-            sourceParentPath.length);
-        sourcePath[sourcePath.length - 1] = source.getLocalNameBytes();
-      }
-
-      void setTarget(INode target, byte[][] targetParentPath) {
-        targetPath = new byte[targetParentPath.length + 1][];
-        System.arraycopy(targetParentPath, 0, targetPath, 0,
-            targetParentPath.length);
-        targetPath[targetPath.length - 1] = target.getLocalNameBytes();
-      }
-
-      void setTarget(byte[][] targetPath) {
-        this.targetPath = targetPath;
-      }
-
-      boolean isRename() {
-        return sourcePath != null && targetPath != null;
-      }
-
-      byte[][] getSourcePath() {
-        return sourcePath;
-      }
-
-      byte[][] getTargetPath() {
-        return targetPath;
-      }
-    }
-
-    /** The root directory of the snapshots */
-    private final INodeDirectorySnapshottable snapshotRoot;
-    /** The starting point of the difference */
-    private final Snapshot from;
-    /** The end point of the difference */
-    private final Snapshot to;
-    /**
-     * A map recording modified INodeFile and INodeDirectory and their relative
-     * path corresponding to the snapshot root. Sorted based on their names.
-     */ 
-    private final SortedMap<INode, byte[][]> diffMap =
-        new TreeMap<INode, byte[][]>(INODE_COMPARATOR);
-    /**
-     * A map capturing the detailed difference about file creation/deletion.
-     * Each key indicates a directory whose children have been changed between
-     * the two snapshots, while its associated value is a {@link ChildrenDiff}
-     * storing the changes (creation/deletion) happened to the children (files).
-     */
-    private final Map<INodeDirectory, ChildrenDiff> dirDiffMap = 
-        new HashMap<INodeDirectory, ChildrenDiff>();
-
-    private final Map<Long, RenameEntry> renameMap =
-        new HashMap<Long, RenameEntry>();
-
-    SnapshotDiffInfo(INodeDirectorySnapshottable snapshotRoot, Snapshot start,
-        Snapshot end) {
-      this.snapshotRoot = snapshotRoot;
-      this.from = start;
-      this.to = end;
-    }
-    
-    /** Add a dir-diff pair */
-    private void addDirDiff(INodeDirectory dir, byte[][] relativePath,
-        ChildrenDiff diff) {
-      dirDiffMap.put(dir, diff);
-      diffMap.put(dir, relativePath);
-      // detect rename
-      for (INode created : diff.getList(ListType.CREATED)) {
-        if (created.isReference()) {
-          RenameEntry entry = getEntry(created.getId());
-          if (entry.getTargetPath() == null) {
-            entry.setTarget(created, relativePath);
-          }
-        }
-      }
-      for (INode deleted : diff.getList(ListType.DELETED)) {
-        if (deleted instanceof INodeReference.WithName) {
-          RenameEntry entry = getEntry(deleted.getId());
-          entry.setSource(deleted, relativePath);
-        }
-      }
-    }
-
-    private RenameEntry getEntry(long inodeId) {
-      RenameEntry entry = renameMap.get(inodeId);
-      if (entry == null) {
-        entry = new RenameEntry();
-        renameMap.put(inodeId, entry);
-      }
-      return entry;
-    }
-
-    private void setRenameTarget(long inodeId, byte[][] path) {
-      getEntry(inodeId).setTarget(path);
-    }
-
-    /** Add a modified file */ 
-    private void addFileDiff(INodeFile file, byte[][] relativePath) {
-      diffMap.put(file, relativePath);
-    }
-    
-    /** @return True if {@link #from} is earlier than {@link #to} */
-    private boolean isFromEarlier() {
-      return Snapshot.ID_COMPARATOR.compare(from, to) < 0;
-    }
-    
-    /**
-     * Generate a {@link SnapshotDiffReport} based on detailed diff information.
-     * @return A {@link SnapshotDiffReport} describing the difference
-     */
-    public SnapshotDiffReport generateReport() {
-      List<DiffReportEntry> diffReportList = new ArrayList<DiffReportEntry>();
-      for (INode node : diffMap.keySet()) {
-        diffReportList.add(new DiffReportEntry(DiffType.MODIFY, diffMap
-            .get(node), null));
-        if (node.isDirectory()) {
-          ChildrenDiff dirDiff = dirDiffMap.get(node);
-          List<DiffReportEntry> subList = dirDiff.generateReport(
-              diffMap.get(node), isFromEarlier(), renameMap);
-          diffReportList.addAll(subList);
-        }
-      }
-      return new SnapshotDiffReport(snapshotRoot.getFullPathName(),
-          Snapshot.getSnapshotName(from), Snapshot.getSnapshotName(to),
-          diffReportList);
-    }
-  }
 
   /**
    * Snapshots of this directory in ascending order of snapshot names.
@@ -496,9 +329,9 @@ public class INodeDirectorySnapshottable
   private void computeDiffRecursively(INode node, List<byte[]> parentPath,
       SnapshotDiffInfo diffReport) {
     final Snapshot earlierSnapshot = diffReport.isFromEarlier() ?
-        diffReport.from : diffReport.to;
+        diffReport.getFrom() : diffReport.getTo();
     final Snapshot laterSnapshot = diffReport.isFromEarlier() ?
-        diffReport.to : diffReport.from;
+        diffReport.getTo() : diffReport.getFrom();
     byte[][] relativePath = parentPath.toArray(new byte[parentPath.size()][]);
     if (node.isDirectory()) {
       final ChildrenDiff diff = new ChildrenDiff();

Modified: hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java?rev=1605180&r1=1605179&r2=1605180&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
Tue Jun 24 20:31:18 2014
@@ -30,9 +30,11 @@ import java.util.concurrent.atomic.Atomi
 import javax.management.ObjectName;
 
 import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
 import org.apache.hadoop.hdfs.protocol.SnapshotException;
 import org.apache.hadoop.hdfs.protocol.SnapshotInfo;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
+import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
 import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
 import org.apache.hadoop.hdfs.server.namenode.FSImageFormat;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
@@ -40,7 +42,6 @@ import org.apache.hadoop.hdfs.server.nam
 import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
 import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
 import org.apache.hadoop.hdfs.server.namenode.INodesInPath;
-import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
 import org.apache.hadoop.metrics2.util.MBeans;
 
 /**
@@ -361,12 +362,13 @@ public class SnapshotManager implements 
    * Compute the difference between two snapshots of a directory, or between a
    * snapshot of the directory and its current tree.
    */
-  public SnapshotDiffInfo diff(final String path, final String from,
+  public SnapshotDiffReport diff(final String path, final String from,
       final String to) throws IOException {
     if ((from == null || from.isEmpty())
         && (to == null || to.isEmpty())) {
       // both fromSnapshot and toSnapshot indicate the current tree
-      return null;
+      return new SnapshotDiffReport(path, from, to,
+          Collections.<DiffReportEntry> emptyList());
     }
 
     // Find the source root directory path where the snapshots were taken.
@@ -374,8 +376,10 @@ public class SnapshotManager implements 
     INodesInPath inodesInPath = fsdir.getINodesInPath4Write(path.toString());
     final INodeDirectorySnapshottable snapshotRoot = INodeDirectorySnapshottable
         .valueOf(inodesInPath.getLastINode(), path);
-    
-    return snapshotRoot.computeDiff(from, to);
+
+    final SnapshotDiffInfo diffs = snapshotRoot.computeDiff(from, to);
+    return diffs != null ? diffs.generateReport() : new SnapshotDiffReport(
+        path, from, to, Collections.<DiffReportEntry> emptyList());
   }
   
   public void clearSnapshottableDirs() {



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