HDFS-5596. Implement RPC stubs. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1550544 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java

@@ -2278,7 +2278,8 @@ public abstract class FileSystem extends Configured implements Closeable {
    * @param aclSpec List<AclEntry> describing modifications
    * @throws IOException if an ACL could not be modified
    */
-  public void modifyAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     throw new UnsupportedOperationException(getClass().getSimpleName()
         + " doesn't support modifyAclEntries");
   }
@@ -2291,7 +2292,8 @@ public abstract class FileSystem extends Configured implements Closeable {
    * @param aclSpec List<AclEntry> describing entries to remove
    * @throws IOException if an ACL could not be modified
    */
-  public void removeAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void removeAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     throw new UnsupportedOperationException(getClass().getSimpleName()
         + " doesn't support removeAclEntries");
   }
@@ -2331,7 +2333,7 @@ public abstract class FileSystem extends Configured implements Closeable {
    *   for user, group, and others for compatibility with permission bits.
    * @throws IOException if an ACL could not be modified
    */
-  public void setAcl(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
     throw new UnsupportedOperationException(getClass().getSimpleName()
         + " doesn't support setAcl");
   }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FilterFileSystem.java

@@ -22,6 +22,7 @@ import java.io.*;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.EnumSet;
+import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -512,29 +513,29 @@ public class FilterFileSystem extends FileSystem {
   }
 
   @Override
-  public void modifyAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     fs.modifyAclEntries(path, aclSpec);
   }
 
   @Override
-  public void removeAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void removeAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     fs.removeAclEntries(path, aclSpec);
   }
 
   @Override
-  public void removeDefaultAcl(Path path)
-      throws IOException {
+  public void removeDefaultAcl(Path path) throws IOException {
     fs.removeDefaultAcl(path);
   }
 
   @Override
-  public void removeAcl(Path path)
-      throws IOException {
+  public void removeAcl(Path path) throws IOException {
     fs.removeAcl(path);
   }
 
   @Override
-  public void setAcl(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
     fs.setAcl(path, aclSpec);
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/AclEntryScope.java

@@ -38,5 +38,5 @@ public enum AclEntryScope {
    * entry is not inspected as part of permission enforcement on the directory
    * that owns it.
    */
-  DEFAULT
+  DEFAULT;
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/AclEntryType.java

@@ -54,5 +54,5 @@ public enum AclEntryType {
    * An ACL entry that applies to all other users that were not covered by one
    * of the more specific ACL entry types.
    */
-  OTHER
+  OTHER;
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/AclStatus.java

@@ -36,7 +36,7 @@ public class AclStatus {
   private final String owner;
   private final String group;
   private final boolean stickyBit;
-  private final Iterable<AclEntry> entries;
+  private final List<AclEntry> entries;
 
   /**
    * Returns the file owner.
@@ -68,9 +68,9 @@ public class AclStatus {
   /**
    * Returns the list of all ACL entries, ordered by their natural ordering.
    *
-   * @return Iterable<AclEntry> unmodifiable ordered list of all ACL entries
+   * @return List<AclEntry> unmodifiable ordered list of all ACL entries
    */
-  public Iterable<AclEntry> getEntries() {
+  public List<AclEntry> getEntries() {
     return entries;
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ChRootedFileSystem.java

@@ -20,6 +20,7 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.net.URI;
 import java.util.EnumSet;
+import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -279,31 +280,31 @@ class ChRootedFileSystem extends FilterFileSystem {
       throws IOException {
     super.setTimes(fullPath(f), mtime, atime);
   }
-  
+
   @Override
-  public void modifyAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     super.modifyAclEntries(fullPath(path), aclSpec);
   }
 
   @Override
-  public void removeAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void removeAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
     super.removeAclEntries(fullPath(path), aclSpec);
   }
 
   @Override
-  public void removeDefaultAcl(Path path)
-      throws IOException {
+  public void removeDefaultAcl(Path path) throws IOException {
     super.removeDefaultAcl(fullPath(path));
   }
 
   @Override
-  public void removeAcl(Path path)
-      throws IOException {
+  public void removeAcl(Path path) throws IOException {
     super.removeAcl(fullPath(path));
   }
 
   @Override
-  public void setAcl(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
     super.setAcl(fullPath(path), aclSpec);
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java

@@ -474,16 +474,18 @@ public class ViewFileSystem extends FileSystem {
   }
 
   @Override
-  public void modifyAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
-    InodeTree.ResolveResult<FileSystem> res =
-      fsState.resolve(getUriPath(path), true);
+  public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
+    InodeTree.ResolveResult<FileSystem> res = fsState.resolve(getUriPath(path),
+        true);
     res.targetFileSystem.modifyAclEntries(res.remainingPath, aclSpec);
   }
 
   @Override
-  public void removeAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException {
-    InodeTree.ResolveResult<FileSystem> res =
-      fsState.resolve(getUriPath(path), true);
+  public void removeAclEntries(Path path, List<AclEntry> aclSpec)
+      throws IOException {
+    InodeTree.ResolveResult<FileSystem> res = fsState.resolve(getUriPath(path),
+        true);
     res.targetFileSystem.removeAclEntries(res.remainingPath, aclSpec);
   }
 
@@ -504,7 +506,7 @@ public class ViewFileSystem extends FileSystem {
   }
 
   @Override
-  public void setAcl(Path path, Iterable<AclEntry> aclSpec) throws IOException {
+  public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException {
     InodeTree.ResolveResult<FileSystem> res =
       fsState.resolve(getUriPath(path), true);
     res.targetFileSystem.setAcl(res.remainingPath, aclSpec);

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestHarFileSystem.java

@@ -35,6 +35,7 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.EnumSet;
 import java.util.Iterator;
+import java.util.List;
 
 import static org.apache.hadoop.fs.Options.ChecksumOpt;
 import static org.apache.hadoop.fs.Options.CreateOpts;
@@ -167,11 +168,19 @@ public class TestHarFileSystem {
         String snapshotNewName) throws IOException;
     public void deleteSnapshot(Path path, String snapshotName)
         throws IOException;
-    public void modifyAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException;
-    public void removeAclEntries(Path path, Iterable<AclEntry> aclSpec) throws IOException;
+
+    public void modifyAclEntries(Path path, List<AclEntry> aclSpec)
+        throws IOException;
+
+    public void removeAclEntries(Path path, List<AclEntry> aclSpec)
+        throws IOException;
+
     public void removeDefaultAcl(Path path) throws IOException;
+
     public void removeAcl(Path path) throws IOException;
-    public void setAcl(Path path, Iterable<AclEntry> aclSpec) throws IOException;
+
+    public void setAcl(Path path, List<AclEntry> aclSpec) throws IOException;
+
     public AclStatus getAclStatus(Path path) throws IOException;
   }
 

hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-4685.txt

@@ -12,6 +12,8 @@ HDFS-4685 (Unreleased)
     HDFS-5650. Remove AclReadFlag and AclWriteFlag in FileSystem API.
     (Haohui Mai via cnauroth)
 
+    HDFS-5596. Implement RPC stubs. (Haohui Mai via cnauroth)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -481,6 +481,7 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
                 <includes>
                   <include>ClientNamenodeProtocol.proto</include>
                   <include>NamenodeProtocol.proto</include>
+                  <include>acl.proto</include>
                 </includes>
               </source>
               <output>${project.build.directory}/generated-sources/java</output>

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

@@ -104,6 +104,8 @@ import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.VolumeId;
+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.client.ClientMmapManager;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
@@ -2629,4 +2631,82 @@ public class DFSClient implements java.io.Closeable {
   public ClientMmapManager getMmapManager() {
     return mmapManager;
   }
+
+  void modifyAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    checkOpen();
+    try {
+      namenode.modifyAclEntries(src, aclSpec);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     SafeModeException.class,
+                                     UnresolvedPathException.class,
+                                     SnapshotAccessControlException.class);
+    }
+  }
+
+  void removeAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    checkOpen();
+    try {
+      namenode.removeAclEntries(src, aclSpec);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     SafeModeException.class,
+                                     UnresolvedPathException.class,
+                                     SnapshotAccessControlException.class);
+    }
+  }
+
+  void removeDefaultAcl(String src) throws IOException {
+    checkOpen();
+    try {
+      namenode.removeDefaultAcl(src);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     SafeModeException.class,
+                                     UnresolvedPathException.class,
+                                     SnapshotAccessControlException.class);
+    }
+  }
+
+  void removeAcl(String src) throws IOException {
+    checkOpen();
+    try {
+      namenode.removeAcl(src);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     SafeModeException.class,
+                                     UnresolvedPathException.class,
+                                     SnapshotAccessControlException.class);
+    }
+  }
+
+  void setAcl(String src, List<AclEntry> aclSpec) throws IOException {
+    checkOpen();
+    try {
+      namenode.setAcl(src, aclSpec);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     SafeModeException.class,
+                                     UnresolvedPathException.class,
+                                     SnapshotAccessControlException.class);
+    }
+  }
+
+  AclStatus getAclStatus(String src) throws IOException {
+    checkOpen();
+    try {
+      return namenode.getAclStatus(src);
+    } catch(RemoteException re) {
+      throw re.unwrapRemoteException(AccessControlException.class,
+                                     FileNotFoundException.class,
+                                     UnresolvedPathException.class);
+    }
+  }
 }

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

@@ -53,6 +53,8 @@ import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
 import org.apache.hadoop.fs.VolumeId;
+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.client.HdfsAdmin;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
@@ -1722,4 +1724,130 @@ public class DistributedFileSystem extends FileSystem {
   public RemoteIterator<CachePoolEntry> listCachePools() throws IOException {
     return dfs.listCachePools();
   }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void modifyAclEntries(Path path, final List<AclEntry> aclSpec)
+      throws IOException {
+    Path absF = fixRelativePart(path);
+    new FileSystemLinkResolver<Void>() {
+      @Override
+      public Void doCall(final Path p) throws IOException {
+        dfs.modifyAclEntries(getPathName(p), aclSpec);
+        return null;
+      }
+
+      @Override
+      public Void next(final FileSystem fs, final Path p) throws IOException {
+        fs.modifyAclEntries(p, aclSpec);
+        return null;
+      }
+    }.resolve(this, absF);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void removeAclEntries(Path path, final List<AclEntry> aclSpec)
+      throws IOException {
+    Path absF = fixRelativePart(path);
+    new FileSystemLinkResolver<Void>() {
+      @Override
+      public Void doCall(final Path p) throws IOException {
+        dfs.removeAclEntries(getPathName(p), aclSpec);
+        return null;
+      }
+
+      @Override
+      public Void next(final FileSystem fs, final Path p) throws IOException {
+        fs.removeAclEntries(p, aclSpec);
+        return null;
+      }
+    }.resolve(this, absF);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void removeDefaultAcl(Path path) throws IOException {
+    final Path absF = fixRelativePart(path);
+    new FileSystemLinkResolver<Void>() {
+      @Override
+      public Void doCall(final Path p) throws IOException {
+        dfs.removeDefaultAcl(getPathName(p));
+        return null;
+      }
+      @Override
+      public Void next(final FileSystem fs, final Path p)
+        throws IOException, UnresolvedLinkException {
+        fs.removeDefaultAcl(p);
+        return null;
+      }
+    }.resolve(this, absF);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void removeAcl(Path path) throws IOException {
+    final Path absF = fixRelativePart(path);
+    new FileSystemLinkResolver<Void>() {
+      @Override
+      public Void doCall(final Path p) throws IOException {
+        dfs.removeAcl(getPathName(p));
+        return null;
+      }
+      @Override
+      public Void next(final FileSystem fs, final Path p)
+        throws IOException, UnresolvedLinkException {
+        fs.removeAcl(p);
+        return null;
+      }
+    }.resolve(this, absF);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void setAcl(Path path, final List<AclEntry> aclSpec) throws IOException {
+    Path absF = fixRelativePart(path);
+    new FileSystemLinkResolver<Void>() {
+      @Override
+      public Void doCall(final Path p) throws IOException {
+        dfs.setAcl(getPathName(p), aclSpec);
+        return null;
+      }
+
+      @Override
+      public Void next(final FileSystem fs, final Path p) throws IOException {
+        fs.setAcl(p, aclSpec);
+        return null;
+      }
+    }.resolve(this, absF);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public AclStatus getAclStatus(Path path) throws IOException {
+    final Path absF = fixRelativePart(path);
+    return new FileSystemLinkResolver<AclStatus>() {
+      @Override
+      public AclStatus doCall(final Path p) throws IOException {
+        return dfs.getAclStatus(getPathName(p));
+      }
+      @Override
+      public AclStatus next(final FileSystem fs, final Path p)
+        throws IOException, UnresolvedLinkException {
+        return fs.getAclStatus(p);
+      }
+    }.resolve(this, absF);
+  }
 }

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

@@ -19,6 +19,7 @@ package org.apache.hadoop.hdfs.protocol;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -32,6 +33,8 @@ import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
 import org.apache.hadoop.fs.Options.Rename;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.permission.AclEntry;
+import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
@@ -1180,4 +1183,49 @@ public interface ClientProtocol {
   @Idempotent
   public BatchedEntries<CachePoolEntry> listCachePools(String prevPool)
       throws IOException;
+
+  /**
+   * Modifies ACL entries of files and directories.  This method can add new ACL
+   * entries or modify the permissions on existing ACL entries.  All existing
+   * ACL entries that are not specified in this call are retained without
+   * changes.  (Modifications are merged into the current ACL.)
+   */
+  @Idempotent
+  public void modifyAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException;
+
+  /**
+   * Removes ACL entries from files and directories.  Other ACL entries are
+   * retained.
+   */
+  @Idempotent
+  public void removeAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException;
+
+  /**
+   * Removes all default ACL entries from files and directories.
+   */
+  @Idempotent
+  public void removeDefaultAcl(String src) throws IOException;
+
+  /**
+   * Removes all but the base ACL entries of files and directories.  The entries
+   * for user, group, and others are retained for compatibility with permission
+   * bits.
+   */
+  @Idempotent
+  public void removeAcl(String src) throws IOException;
+
+  /**
+   * Fully replaces ACL of files and directories, discarding all existing
+   * entries.
+   */
+  @Idempotent
+  public void setAcl(String src, List<AclEntry> aclSpec) throws IOException;
+
+  /**
+   * Gets the ACLs of files and directories.
+   */
+  @Idempotent
+  public AclStatus getAclStatus(String src) throws IOException;
 }

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

@@ -37,6 +37,18 @@ import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.GetAclStatusRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.GetAclStatusResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.ModifyAclEntriesRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.ModifyAclEntriesResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclEntriesRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclEntriesResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveDefaultAclRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveDefaultAclResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.SetAclRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.SetAclResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AbandonBlockRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AbandonBlockResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AddBlockRequestProto;
@@ -270,6 +282,24 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
       VOID_SETBALANCERBANDWIDTH_RESPONSE = 
         SetBalancerBandwidthResponseProto.newBuilder().build();
 
+  private static final SetAclResponseProto
+    VOID_SETACL_RESPONSE = SetAclResponseProto.getDefaultInstance();
+
+  private static final ModifyAclEntriesResponseProto
+    VOID_MODIFYACLENTRIES_RESPONSE = ModifyAclEntriesResponseProto
+      .getDefaultInstance();
+
+  private static final RemoveAclEntriesResponseProto
+    VOID_REMOVEACLENTRIES_RESPONSE = RemoveAclEntriesResponseProto
+      .getDefaultInstance();
+
+  private static final RemoveDefaultAclResponseProto
+    VOID_REMOVEDEFAULTACL_RESPONSE = RemoveDefaultAclResponseProto
+      .getDefaultInstance();
+
+  private static final RemoveAclResponseProto
+    VOID_REMOVEACL_RESPONSE = RemoveAclResponseProto.getDefaultInstance();
+
   /**
    * Constructor
    * 
@@ -1135,4 +1165,73 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
       throw new ServiceException(e);
     }
   }
+
+  @Override
+  public ModifyAclEntriesResponseProto modifyAclEntries(
+      RpcController controller, ModifyAclEntriesRequestProto req)
+      throws ServiceException {
+    try {
+      server.modifyAclEntries(req.getSrc(), PBHelper.convertAclEntry(req.getAclSpecList()));
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_MODIFYACLENTRIES_RESPONSE;
+  }
+
+  @Override
+  public RemoveAclEntriesResponseProto removeAclEntries(
+      RpcController controller, RemoveAclEntriesRequestProto req)
+      throws ServiceException {
+    try {
+      server.removeAclEntries(req.getSrc(),
+          PBHelper.convertAclEntry(req.getAclSpecList()));
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_REMOVEACLENTRIES_RESPONSE;
+  }
+
+  @Override
+  public RemoveDefaultAclResponseProto removeDefaultAcl(
+      RpcController controller, RemoveDefaultAclRequestProto req)
+      throws ServiceException {
+    try {
+      server.removeDefaultAcl(req.getSrc());
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_REMOVEDEFAULTACL_RESPONSE;
+  }
+
+  @Override
+  public RemoveAclResponseProto removeAcl(RpcController controller,
+      RemoveAclRequestProto req) throws ServiceException {
+    try {
+      server.removeAcl(req.getSrc());
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_REMOVEACL_RESPONSE;
+  }
+
+  @Override
+  public SetAclResponseProto setAcl(RpcController controller,
+      SetAclRequestProto req) throws ServiceException {
+    try {
+      server.setAcl(req.getSrc(), PBHelper.convertAclEntry(req.getAclSpecList()));
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return VOID_SETACL_RESPONSE;
+  }
+
+  @Override
+  public GetAclStatusResponseProto getAclStatus(RpcController controller,
+      GetAclStatusRequestProto req) throws ServiceException {
+    try {
+      return PBHelper.convert(server.getAclStatus(req.getSrc()));
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+  }
 }

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

@@ -21,6 +21,7 @@ import java.io.Closeable;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -32,6 +33,8 @@ import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.Options.Rename;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.permission.AclEntry;
+import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
@@ -53,6 +56,12 @@ import org.apache.hadoop.hdfs.protocol.NSQuotaExceededException;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.GetAclStatusRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.ModifyAclEntriesRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclEntriesRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveAclRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.RemoveDefaultAclRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.SetAclRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AbandonBlockRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AddBlockRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AddCachePoolRequestProto;
@@ -1151,4 +1160,76 @@ public class ClientNamenodeProtocolTranslatorPB implements
       throw ProtobufHelper.getRemoteException(e);
     }
   }
+
+  @Override
+  public void modifyAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    ModifyAclEntriesRequestProto req = ModifyAclEntriesRequestProto
+        .newBuilder().setSrc(src)
+        .addAllAclSpec(PBHelper.convertAclEntryProto(aclSpec)).build();
+    try {
+      rpcProxy.modifyAclEntries(null, req);
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
+  @Override
+  public void removeAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    RemoveAclEntriesRequestProto req = RemoveAclEntriesRequestProto
+        .newBuilder().setSrc(src)
+        .addAllAclSpec(PBHelper.convertAclEntryProto(aclSpec)).build();
+    try {
+      rpcProxy.removeAclEntries(null, req);
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
+  @Override
+  public void removeDefaultAcl(String src) throws IOException {
+    RemoveDefaultAclRequestProto req = RemoveDefaultAclRequestProto
+        .newBuilder().setSrc(src).build();
+    try {
+      rpcProxy.removeDefaultAcl(null, req);
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
+  @Override
+  public void removeAcl(String src) throws IOException {
+    RemoveAclRequestProto req = RemoveAclRequestProto.newBuilder()
+        .setSrc(src).build();
+    try {
+      rpcProxy.removeAcl(null, req);
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
+  @Override
+  public void setAcl(String src, List<AclEntry> aclSpec) throws IOException {
+    SetAclRequestProto req = SetAclRequestProto.newBuilder()
+        .setSrc(src)
+        .addAllAclSpec(PBHelper.convertAclEntryProto(aclSpec))
+        .build();
+    try {
+      rpcProxy.setAcl(null, req);
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
+  @Override
+  public AclStatus getAclStatus(String src) throws IOException {
+    GetAclStatusRequestProto req = GetAclStatusRequestProto.newBuilder()
+        .setSrc(src).build();
+    try {
+      return PBHelper.convert(rpcProxy.getAclStatus(null, req));
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
 }

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

@@ -31,6 +31,11 @@ import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.CreateFlag;
 import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.AclEntry;
+import org.apache.hadoop.fs.permission.AclEntryScope;
+import org.apache.hadoop.fs.permission.AclEntryType;
+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.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.ha.proto.HAServiceProtocolProtos;
@@ -59,6 +64,12 @@ import org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.AclEntryProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.AclStatusProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.AclEntryProto.AclEntryScopeProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.AclEntryProto.AclEntryTypeProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.AclEntryProto.FsActionProto;
+import org.apache.hadoop.hdfs.protocol.proto.AclProtos.GetAclStatusResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CacheDirectiveEntryProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CacheDirectiveInfoExpirationProto;
@@ -185,6 +196,13 @@ public class PBHelper {
       RegisterCommandProto.newBuilder().build();
   private static final RegisterCommand REG_CMD = new RegisterCommand();
 
+  private static final AclEntryScope[] ACL_ENTRY_SCOPE_VALUES =
+      AclEntryScope.values();
+  private static final AclEntryType[] ACL_ENTRY_TYPE_VALUES =
+      AclEntryType.values();
+  private static final FsAction[] FSACTION_VALUES =
+      FsAction.values();
+
   private PBHelper() {
     /** Hidden constructor */
   }
@@ -193,6 +211,10 @@ public class PBHelper {
     return ByteString.copyFrom(bytes);
   }
 
+  private static <T extends Enum<T>, U extends Enum<U>> U castEnum(T from, U[] to) {
+    return to[from.ordinal()];
+  }
+
   public static NamenodeRole convert(NamenodeRoleProto role) {
     switch (role) {
     case NAMENODE:
@@ -717,8 +739,9 @@ public class PBHelper {
       return REG_CMD;
     case BlockIdCommand:
       return PBHelper.convert(proto.getBlkIdCmd());
+    default:
+      return null;
     }
-    return null;
   }
   
   public static BalancerBandwidthCommandProto convert(
@@ -1755,4 +1778,63 @@ public class PBHelper {
     assert size >= 0;
     return new ExactSizeInputStream(input, size);
   }
+
+  private static AclEntryScopeProto convert(AclEntryScope v) {
+    return AclEntryScopeProto.valueOf(v.ordinal());
+  }
+
+  private static AclEntryScope convert(AclEntryScopeProto v) {
+    return castEnum(v, ACL_ENTRY_SCOPE_VALUES);
+  }
+
+  private static AclEntryTypeProto convert(AclEntryType e) {
+    return AclEntryTypeProto.valueOf(e.ordinal());
+  }
+
+  private static AclEntryType convert(AclEntryTypeProto v) {
+    return castEnum(v, ACL_ENTRY_TYPE_VALUES);
+  }
+
+  private static FsActionProto convert(FsAction v) {
+    return FsActionProto.valueOf(v.ordinal());
+  }
+
+  private static FsAction convert(FsActionProto v) {
+    return castEnum(v, FSACTION_VALUES);
+  }
+
+  public static List<AclEntryProto> convertAclEntryProto(
+      List<AclEntry> aclSpec) {
+    ArrayList<AclEntryProto> r = Lists.newArrayListWithCapacity(aclSpec.size());
+    for (AclEntry e : aclSpec) {
+      r.add(AclEntryProto.newBuilder().setType(convert(e.getType()))
+          .setName(e.getName()).setPermissions(convert(e.getPermission()))
+          .setScope(convert(e.getScope())).build());
+    }
+    return r;
+  }
+
+  public static List<AclEntry> convertAclEntry(List<AclEntryProto> aclSpec) {
+    ArrayList<AclEntry> r = Lists.newArrayListWithCapacity(aclSpec.size());
+    for (AclEntryProto e : aclSpec) {
+      r.add(new AclEntry.Builder().setType(convert(e.getType()))
+          .setName(e.getName()).setPermission(convert(e.getPermissions()))
+          .setScope(convert(e.getScope())).build());
+    }
+    return r;
+  }
+
+  public static AclStatus convert(GetAclStatusResponseProto e) {
+    AclStatusProto r = e.getResult();
+    return new AclStatus.Builder().owner(r.getOwner()).group(r.getGroup())
+        .stickyBit(r.getSticky())
+        .addEntries(convertAclEntry(r.getEntriesList())).build();
+  }
+
+  public static GetAclStatusResponseProto convert(AclStatus e) {
+    AclStatusProto r = AclStatusProto.newBuilder().setOwner(e.getOwner())
+        .setGroup(e.getGroup()).setSticky(e.isStickyBit())
+        .addAllEntries(convertAclEntryProto(e.getEntries())).build();
+    return GetAclStatusResponseProto.newBuilder().setResult(r).build();
+  }
 }

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

@@ -138,6 +138,8 @@ import org.apache.hadoop.fs.Options.Rename;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.permission.AclEntry;
+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.fs.permission.PermissionStatus;
@@ -7312,6 +7314,30 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     return results;
   }
 
+  void modifyAclEntries(String src, Iterable<AclEntry> aclSpec) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
+  void removeAclEntries(String src, Iterable<AclEntry> aclSpec) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
+  void removeDefaultAcl(String src) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
+  void removeAcl(String src) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
+  void setAcl(String src, Iterable<AclEntry> aclSpec) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
+  AclStatus getAclStatus(String src) {
+    throw new UnsupportedOperationException("Unimplemented");
+  }
+
   /**
    * Default AuditLogger implementation; used when no access logger is
    * defined in the config file. It can also be explicitly listed in the

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

@@ -47,6 +47,8 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
+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.ha.HAServiceStatus;
@@ -1279,4 +1281,36 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throws IOException {
     return namesystem.listCachePools(prevKey != null ? prevKey : "");
   }
+
+  @Override
+  public void modifyAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    namesystem.modifyAclEntries(src, aclSpec);
+  }
+
+  @Override
+  public void removeAclEntries(String src, List<AclEntry> aclSpec)
+      throws IOException {
+    namesystem.removeAclEntries(src, aclSpec);
+  }
+
+  @Override
+  public void removeDefaultAcl(String src) throws IOException {
+    namesystem.removeDefaultAcl(src);
+  }
+
+  @Override
+  public void removeAcl(String src) throws IOException {
+    namesystem.removeAcl(src);
+  }
+
+  @Override
+  public void setAcl(String src, List<AclEntry> aclSpec) throws IOException {
+    namesystem.setAcl(src, aclSpec);
+  }
+
+  @Override
+  public AclStatus getAclStatus(String src) throws IOException {
+    return namesystem.getAclStatus(src);
+  }
 }

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

@@ -30,6 +30,7 @@ package hadoop.hdfs;
 
 import "Security.proto";
 import "hdfs.proto";
+import "acl.proto";
 
 /**
  * The ClientNamenodeProtocol Service defines the interface between a client 
@@ -709,4 +710,16 @@ service ClientNamenodeProtocol {
       returns(GetSnapshotDiffReportResponseProto);
   rpc isFileClosed(IsFileClosedRequestProto)
       returns(IsFileClosedResponseProto);
+  rpc modifyAclEntries(ModifyAclEntriesRequestProto)
+      returns(ModifyAclEntriesResponseProto);
+  rpc removeAclEntries(RemoveAclEntriesRequestProto)
+      returns(RemoveAclEntriesResponseProto);
+  rpc removeDefaultAcl(RemoveDefaultAclRequestProto)
+      returns(RemoveDefaultAclResponseProto);
+  rpc removeAcl(RemoveAclRequestProto)
+      returns(RemoveAclResponseProto);
+  rpc setAcl(SetAclRequestProto)
+      returns(SetAclResponseProto);
+  rpc getAclStatus(GetAclStatusRequestProto)
+      returns(GetAclStatusResponseProto);
 }

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

@@ -0,0 +1,107 @@
+/**
+ * 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.
+ */
+
+option java_package = "org.apache.hadoop.hdfs.protocol.proto";
+option java_outer_classname = "AclProtos";
+option java_generate_equals_and_hash = true;
+package hadoop.hdfs;
+
+import "hdfs.proto";
+
+message AclEntryProto {
+  enum AclEntryScopeProto {
+    ACCESS  = 0x0;
+    DEFAULT = 0x1;
+  }
+
+  enum AclEntryTypeProto {
+    USER  = 0x0;
+    GROUP = 0x1;
+    MASK  = 0x2;
+    OTHER = 0x3;
+  }
+
+  enum FsActionProto {
+    NONE          = 0x0;
+    EXECUTE       = 0x1;
+    WRITE         = 0x2;
+    WRITE_EXECUTE = 0x3;
+    READ          = 0x4;
+    READ_EXECUTE  = 0x5;
+    READ_WRITE    = 0x6;
+    PERM_ALL      = 0x7;
+  }
+
+  required AclEntryTypeProto type    = 1;
+  required AclEntryScopeProto scope  = 2;
+  required FsActionProto permissions = 3;
+  required string name               = 4;
+}
+
+message AclStatusProto {
+  required string owner          = 1;
+  required string group          = 2;
+  required bool sticky           = 3;
+  repeated AclEntryProto entries = 4;
+}
+
+message ModifyAclEntriesRequestProto {
+  required string src            = 1;
+  repeated AclEntryProto aclSpec = 2;
+}
+
+message ModifyAclEntriesResponseProto {
+}
+
+message RemoveAclRequestProto {
+  required string src = 1;
+}
+
+message RemoveAclResponseProto {
+}
+
+message RemoveAclEntriesRequestProto {
+  required string src            = 1;
+  repeated AclEntryProto aclSpec = 2;
+}
+
+message RemoveAclEntriesResponseProto {
+}
+
+message RemoveDefaultAclRequestProto {
+  required string src = 1;
+}
+
+message RemoveDefaultAclResponseProto {
+}
+
+message SetAclRequestProto {
+  required string src            = 1;
+  repeated AclEntryProto aclSpec = 2;
+}
+
+message SetAclResponseProto {
+}
+
+message GetAclStatusRequestProto {
+  required string src = 1;
+}
+
+message GetAclStatusResponseProto {
+  required AclStatusProto result = 1;
+}

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java

@@ -24,6 +24,11 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import org.apache.hadoop.fs.permission.AclEntry;
+import org.apache.hadoop.fs.permission.AclEntryScope;
+import org.apache.hadoop.fs.permission.AclEntryType;
+import org.apache.hadoop.fs.permission.AclStatus;
+import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
@@ -72,6 +77,7 @@ import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.proto.SecurityProtos.TokenProto;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.util.DataChecksum;
+import org.junit.Assert;
 import org.junit.Test;
 
 import com.google.common.base.Joiner;
@@ -533,4 +539,28 @@ public class TestPBHelper {
     assertEquals(PBHelper.convert(DataChecksum.Type.CRC32C),
         HdfsProtos.ChecksumTypeProto.CHECKSUM_CRC32C);
   }
+
+  @Test
+  public void testAclEntryProto() {
+    AclEntry e = new AclEntry.Builder().setName("test")
+        .setPermission(FsAction.READ_EXECUTE).setScope(AclEntryScope.DEFAULT)
+        .setType(AclEntryType.OTHER).build();
+    AclEntry[] lists = new AclEntry[] { e };
+
+    Assert.assertArrayEquals(
+        lists,
+        Lists.newArrayList(
+            PBHelper.convertAclEntry(PBHelper.convertAclEntryProto(Lists
+                .newArrayList(e)))).toArray());
+  }
+
+  @Test
+  public void testAclStatusProto() {
+    AclEntry e = new AclEntry.Builder().setName("test")
+        .setPermission(FsAction.READ_EXECUTE).setScope(AclEntryScope.DEFAULT)
+        .setType(AclEntryType.OTHER).build();
+    AclStatus s = new AclStatus.Builder().owner("foo").group("bar").addEntry(e)
+        .build();
+    Assert.assertEquals(s, PBHelper.convert(PBHelper.convert(s)));
+  }
 }