Java 类org.apache.hadoop.hdfs.protocol.DSQuotaExceededException 实例源码

/**
 * Creates a symbolic link.
 * 
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean) 
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  TraceScope scope = getPathTraceScope("createSymlink", target);
  try {
    FsPermission dirPerm = 
        FsPermission.getDefault().applyUMask(dfsClientConf.uMask); 
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileAlreadyExistsException.class, 
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class, 
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/** Method to get stream returned by append call */
private DFSOutputStream callAppend(String src, int buffersize,
    EnumSet<CreateFlag> flag, Progressable progress, String[] favoredNodes)
    throws IOException {
  CreateFlag.validateForAppend(flag);
  try {
    LastBlockWithStatus blkWithStatus = namenode.append(src, clientName,
        new EnumSetWritable<>(flag, CreateFlag.class));
    return DFSOutputStream.newStreamForAppend(this, src, flag, buffersize,
        progress, blkWithStatus.getLastBlock(),
        blkWithStatus.getFileStatus(), dfsClientConf.createChecksum(),
        favoredNodes);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnsupportedOperationException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/**
 * Set replication for an existing file.
 * @param src file name
 * @param replication replication to set the file to
 * 
 * @see ClientProtocol#setReplication(String, short)
 */
public boolean setReplication(String src, short replication)
    throws IOException {
  TraceScope scope = getPathTraceScope("setReplication", src);
  try {
    return namenode.setReplication(src, replication);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename(String, String)
 * @deprecated Use {@link #rename(String, String, Options.Rename...)} instead.
 */
@Deprecated
public boolean rename(String src, String dst) throws IOException {
  checkOpen();
  TraceScope scope = getSrcDstTraceScope("rename", src, dst);
  try {
    return namenode.rename(src, dst);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  TraceScope scope = getSrcDstTraceScope("rename2", src, dst);
  try {
    namenode.rename2(src, dst, options);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   SafeModeException.class,
                                   NSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

@Override
public LastBlockWithStatus append(String src, String clientName,
    EnumSetWritable<CreateFlag> flag) throws AccessControlException,
    DSQuotaExceededException, FileNotFoundException, SafeModeException,
    UnresolvedLinkException, IOException {
  AppendRequestProto req = AppendRequestProto.newBuilder().setSrc(src)
      .setClientName(clientName).setFlag(PBHelper.convertCreateFlag(flag))
      .build();
  try {
    AppendResponseProto res = rpcProxy.append(null, req);
    LocatedBlock lastBlock = res.hasBlock() ? PBHelper
        .convert(res.getBlock()) : null;
    HdfsFileStatus stat = (res.hasStat()) ? PBHelper.convert(res.getStat())
        : null;
    return new LastBlockWithStatus(lastBlock, stat);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
}

@Override
public void rename2(String src, String dst, Rename... options)
    throws AccessControlException, DSQuotaExceededException,
    FileAlreadyExistsException, FileNotFoundException,
    NSQuotaExceededException, ParentNotDirectoryException, SafeModeException,
    UnresolvedLinkException, IOException {
  boolean overwrite = false;
  if (options != null) {
    for (Rename option : options) {
      if (option == Rename.OVERWRITE) {
        overwrite = true;
      }
    }
  }
  Rename2RequestProto req = Rename2RequestProto.newBuilder().
      setSrc(src).
      setDst(dst).setOverwriteDest(overwrite).
      build();
  try {
    rpcProxy.rename2(null, req);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }

}

/**
 * Creates a symbolic link.
 *
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean)
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  checkOpen();
  try (TraceScope ignored = newPathTraceScope("createSymlink", target)) {
    final FsPermission dirPerm = applyUMask(null);
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
        FileAlreadyExistsException.class,
        FileNotFoundException.class,
        ParentNotDirectoryException.class,
        NSQuotaExceededException.class,
        DSQuotaExceededException.class,
        QuotaByStorageTypeExceededException.class,
        UnresolvedPathException.class,
        SnapshotAccessControlException.class);
  }
}

/**
 * Set replication for an existing file.
 * @param src file name
 * @param replication replication to set the file to
 *
 * @see ClientProtocol#setReplication(String, short)
 */
public boolean setReplication(String src, short replication)
    throws IOException {
  checkOpen();
  try (TraceScope ignored = newPathTraceScope("setReplication", src)) {
    return namenode.setReplication(src, replication);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
        FileNotFoundException.class,
        SafeModeException.class,
        DSQuotaExceededException.class,
        QuotaByStorageTypeExceededException.class,
        UnresolvedPathException.class,
        SnapshotAccessControlException.class);
  }
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  try (TraceScope ignored = newSrcDstTraceScope("rename2", src, dst)) {
    namenode.rename2(src, dst, options);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
        DSQuotaExceededException.class,
        QuotaByStorageTypeExceededException.class,
        FileAlreadyExistsException.class,
        FileNotFoundException.class,
        ParentNotDirectoryException.class,
        SafeModeException.class,
        NSQuotaExceededException.class,
        UnresolvedPathException.class,
        SnapshotAccessControlException.class);
  }
}

/**
 * Same {{@link #mkdirs(String, FsPermission, boolean)} except
 * that the permissions has already been masked against umask.
 */
public boolean primitiveMkdir(String src, FsPermission absPermission,
    boolean createParent) throws IOException {
  checkOpen();
  if (absPermission == null) {
    absPermission = applyUMask(null);
  }

  LOG.debug("{}: masked={}", src, absPermission);
  try (TraceScope ignored = tracer.newScope("mkdir")) {
    return namenode.mkdirs(src, absPermission, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
        InvalidPathException.class,
        FileAlreadyExistsException.class,
        FileNotFoundException.class,
        ParentNotDirectoryException.class,
        SafeModeException.class,
        NSQuotaExceededException.class,
        DSQuotaExceededException.class,
        QuotaByStorageTypeExceededException.class,
        UnresolvedPathException.class,
        SnapshotAccessControlException.class);
  }
}

/**
 * Creates a symbolic link.
 * 
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean) 
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  TraceScope scope = getPathTraceScope("createSymlink", target);
  try {
    FsPermission dirPerm = 
        FsPermission.getDefault().applyUMask(dfsClientConf.uMask); 
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileAlreadyExistsException.class, 
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class, 
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/** Method to get stream returned by append call */
private DFSOutputStream callAppend(String src, int buffersize,
    EnumSet<CreateFlag> flag, Progressable progress, String[] favoredNodes)
    throws IOException {
  CreateFlag.validateForAppend(flag);
  try {
    LastBlockWithStatus blkWithStatus = namenode.append(src, clientName,
        new EnumSetWritable<>(flag, CreateFlag.class));
    return DFSOutputStream.newStreamForAppend(this, src, flag, buffersize,
        progress, blkWithStatus.getLastBlock(),
        blkWithStatus.getFileStatus(), dfsClientConf.createChecksum(),
        favoredNodes);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnsupportedOperationException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/**
 * Set replication for an existing file.
 * @param src file name
 * @param replication replication to set the file to
 * 
 * @see ClientProtocol#setReplication(String, short)
 */
public boolean setReplication(String src, short replication)
    throws IOException {
  TraceScope scope = getPathTraceScope("setReplication", src);
  try {
    return namenode.setReplication(src, replication);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename(String, String)
 * @deprecated Use {@link #rename(String, String, Options.Rename...)} instead.
 */
@Deprecated
public boolean rename(String src, String dst) throws IOException {
  checkOpen();
  TraceScope scope = getSrcDstTraceScope("rename", src, dst);
  try {
    return namenode.rename(src, dst);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  TraceScope scope = getSrcDstTraceScope("rename2", src, dst);
  try {
    namenode.rename2(src, dst, options);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   SafeModeException.class,
                                   NSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  } finally {
    scope.close();
  }
}

@Override
public LastBlockWithStatus append(String src, String clientName,
    EnumSetWritable<CreateFlag> flag) throws AccessControlException,
    DSQuotaExceededException, FileNotFoundException, SafeModeException,
    UnresolvedLinkException, IOException {
  AppendRequestProto req = AppendRequestProto.newBuilder().setSrc(src)
      .setClientName(clientName).setFlag(PBHelper.convertCreateFlag(flag))
      .build();
  try {
    AppendResponseProto res = rpcProxy.append(null, req);
    LocatedBlock lastBlock = res.hasBlock() ? PBHelper
        .convert(res.getBlock()) : null;
    HdfsFileStatus stat = (res.hasStat()) ? PBHelper.convert(res.getStat())
        : null;
    return new LastBlockWithStatus(lastBlock, stat);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
}

@Override
public void rename2(String src, String dst, Rename... options)
    throws AccessControlException, DSQuotaExceededException,
    FileAlreadyExistsException, FileNotFoundException,
    NSQuotaExceededException, ParentNotDirectoryException, SafeModeException,
    UnresolvedLinkException, IOException {
  boolean overwrite = false;
  if (options != null) {
    for (Rename option : options) {
      if (option == Rename.OVERWRITE) {
        overwrite = true;
      }
    }
  }
  Rename2RequestProto req = Rename2RequestProto.newBuilder().
      setSrc(src).
      setDst(dst).setOverwriteDest(overwrite).
      build();
  try {
    rpcProxy.rename2(null, req);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }

}

/**
 * Creates a symbolic link.
 * 
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean) 
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  try {
    FsPermission dirPerm = 
        FsPermission.getDefault().applyUMask(dfsClientConf.uMask); 
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileAlreadyExistsException.class, 
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class, 
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/** Method to get stream returned by append call */
private DFSOutputStream callAppend(String src,
    int buffersize, Progressable progress) throws IOException {
  LocatedBlock lastBlock = null;
  try {
    lastBlock = namenode.append(src, clientName);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnsupportedOperationException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
  HdfsFileStatus newStat = getFileInfo(src);
  return DFSOutputStream.newStreamForAppend(this, src, buffersize, progress,
      lastBlock, newStat, dfsClientConf.createChecksum());
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  try {
    namenode.rename2(src, dst, options);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   SafeModeException.class,
                                   NSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/**
 * Sets or resets quotas for a directory.
 * @see ClientProtocol#setQuota(String, long, long)
 */
void setQuota(String src, long namespaceQuota, long diskspaceQuota) 
    throws IOException {
  // sanity check
  if ((namespaceQuota <= 0 && namespaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       namespaceQuota != HdfsConstants.QUOTA_RESET) ||
      (diskspaceQuota <= 0 && diskspaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       diskspaceQuota != HdfsConstants.QUOTA_RESET)) {
    throw new IllegalArgumentException("Invalid values for quota : " +
                                       namespaceQuota + " and " + 
                                       diskspaceQuota);

  }
  try {
    namenode.setQuota(src, namespaceQuota, diskspaceQuota);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

@Override
public HdfsFileStatus create(String src, FsPermission masked,
    String clientName, EnumSetWritable<CreateFlag> flag, boolean createParent,
    short replication, long blockSize, CryptoProtocolVersion[] supportedVersions)
    throws AccessControlException, AlreadyBeingCreatedException,
           DSQuotaExceededException, FileAlreadyExistsException,
           FileNotFoundException, NSQuotaExceededException,
           ParentNotDirectoryException, SafeModeException,
           UnresolvedLinkException, SnapshotAccessControlException,
           IOException {
  try {
    AuthorizationProvider.beginClientOp();
    return server.create(src, masked, clientName, flag, createParent,
        replication, blockSize, supportedVersions);
  } finally {
    AuthorizationProvider.endClientOp();
  }
}

@Override
public LocatedBlock append(String src, String clientName)
    throws AccessControlException, DSQuotaExceededException,
    FileNotFoundException, SafeModeException, UnresolvedLinkException,
    IOException {
  AppendRequestProto req = AppendRequestProto.newBuilder()
      .setSrc(src)
      .setClientName(clientName)
      .build();
  try {
    AppendResponseProto res = rpcProxy.append(null, req);
    return res.hasBlock() ? PBHelper.convert(res.getBlock()) : null;
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
}

@Override
public void rename2(String src, String dst, Rename... options)
    throws AccessControlException, DSQuotaExceededException,
    FileAlreadyExistsException, FileNotFoundException,
    NSQuotaExceededException, ParentNotDirectoryException, SafeModeException,
    UnresolvedLinkException, IOException {
  boolean overwrite = false;
  if (options != null) {
    for (Rename option : options) {
      if (option == Rename.OVERWRITE) {
        overwrite = true;
      }
    }
  }
  Rename2RequestProto req = Rename2RequestProto.newBuilder().
      setSrc(src).
      setDst(dst).setOverwriteDest(overwrite).
      build();
  try {
    rpcProxy.rename2(null, req);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }

}

/**
 * Move blocks from src to trg and delete src
 * See {@link ClientProtocol#concat(String, String [])}.
 */
public void concat(String trg, String[] srcs, boolean restricted)
    throws IOException {
  checkOpen();
  clearFileStatusCache();

  try {
    if (namenodeProtocolProxy != null
        && namenodeProtocolProxy.isMethodSupported("concat", String.class,
            String[].class, boolean.class)) {
      namenode.concat(trg, srcs, restricted);
    } else if (!restricted){
      throw new UnsupportedOperationException(
          "Namenode does not support variable length blocks");
    } else {
      namenode.concat(trg, srcs);
    }
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class);
  }
}

/**
 * Create a directory (or hierarchy of directories) with the given
 * name and permission.
 *
 * @param src The path of the directory being created
 * @param permission The permission of the directory being created.
 * If permission == null, use {@link FsPermission#getDefault()}.
 * @return True if the operation success.
 * @see ClientProtocol#mkdirs(String, FsPermission)
 */
public boolean mkdirs(String src, FsPermission permission)throws IOException{
  checkOpen();
  clearFileStatusCache();

  if (permission == null) {
    permission = FsPermission.getDefault();
  }
  FsPermission masked = permission.applyUMask(FsPermission.getUMask(conf));
  LOG.debug(src + ": masked=" + masked);
  try {
    metrics.incNumCreateDirOps();
    return namenode.mkdirs(src, masked);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class);
  }
}

/**
 * Sets or resets quotas for a directory.
 * @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setQuota(String, long, long)
 */
void setQuota(String src, long namespaceQuota, long diskspaceQuota)
                                               throws IOException {
  // sanity check
  if ((namespaceQuota <= 0 && namespaceQuota != FSConstants.QUOTA_DONT_SET &&
       namespaceQuota != FSConstants.QUOTA_RESET) ||
      (diskspaceQuota <= 0 && diskspaceQuota != FSConstants.QUOTA_DONT_SET &&
       diskspaceQuota != FSConstants.QUOTA_RESET)) {
    throw new IllegalArgumentException("Invalid values for quota : " +
                                       namespaceQuota + " and " +
                                       diskspaceQuota);

  }

  try {
    namenode.setQuota(src, namespaceQuota, diskspaceQuota);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class);
  }
}

static DFSOutputStream newStreamForCreate(DFSClient dfsClient, String src,
    FsPermission masked, EnumSet<CreateFlag> flag, boolean createParent,
    short replication, long blockSize, Progressable progress, int buffersize,
    DataChecksum checksum, String[] favoredNodes) throws IOException {
  final HdfsFileStatus stat;
  try {
    stat = dfsClient.namenode.create(src, masked, dfsClient.clientName,
        new EnumSetWritable<CreateFlag>(flag), createParent, replication,
        blockSize);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class,
                                   SafeModeException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
  final DFSOutputStream out = new DFSOutputStream(dfsClient, src, stat,
      flag, progress, checksum, favoredNodes);
  out.start();
  return out;
}

/**
 * Creates a symbolic link.
 * 
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean) 
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  try {
    FsPermission dirPerm = 
        FsPermission.getDefault().applyUMask(dfsClientConf.uMask); 
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileAlreadyExistsException.class, 
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class, 
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/** Method to get stream returned by append call */
private DFSOutputStream callAppend(HdfsFileStatus stat, String src,
    int buffersize, Progressable progress) throws IOException {
  LocatedBlock lastBlock = null;
  try {
    lastBlock = namenode.append(src, clientName);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnsupportedOperationException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
  return DFSOutputStream.newStreamForAppend(this, src, buffersize, progress,
      lastBlock, stat, dfsClientConf.createChecksum());
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  try {
    namenode.rename2(src, dst, options);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   SafeModeException.class,
                                   NSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/**
 * Sets or resets quotas for a directory.
 * @see ClientProtocol#setQuota(String, long, long)
 */
void setQuota(String src, long namespaceQuota, long diskspaceQuota) 
    throws IOException {
  // sanity check
  if ((namespaceQuota <= 0 && namespaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       namespaceQuota != HdfsConstants.QUOTA_RESET) ||
      (diskspaceQuota <= 0 && diskspaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       diskspaceQuota != HdfsConstants.QUOTA_RESET)) {
    throw new IllegalArgumentException("Invalid values for quota : " +
                                       namespaceQuota + " and " + 
                                       diskspaceQuota);

  }
  try {
    namenode.setQuota(src, namespaceQuota, diskspaceQuota);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

@Override
public HdfsFileStatus create(String src, FsPermission masked,
    String clientName, EnumSetWritable<CreateFlag> flag,
    boolean createParent, short replication, long blockSize)
    throws AccessControlException, AlreadyBeingCreatedException,
    DSQuotaExceededException, FileAlreadyExistsException,
    FileNotFoundException, NSQuotaExceededException,
    ParentNotDirectoryException, SafeModeException, UnresolvedLinkException,
    IOException {
  CreateRequestProto req = CreateRequestProto.newBuilder()
      .setSrc(src)
      .setMasked(PBHelper.convert(masked))
      .setClientName(clientName)
      .setCreateFlag(PBHelper.convertCreateFlag(flag))
      .setCreateParent(createParent)
      .setReplication(replication)
      .setBlockSize(blockSize)
      .build();
  try {
    CreateResponseProto res = rpcProxy.create(null, req);
    return res.hasFs() ? PBHelper.convert(res.getFs()) : null;
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }

}

@Override
public LocatedBlock append(String src, String clientName)
    throws AccessControlException, DSQuotaExceededException,
    FileNotFoundException, SafeModeException, UnresolvedLinkException,
    IOException {
  AppendRequestProto req = AppendRequestProto.newBuilder()
      .setSrc(src)
      .setClientName(clientName)
      .build();
  try {
    AppendResponseProto res = rpcProxy.append(null, req);
    return res.hasBlock() ? PBHelper.convert(res.getBlock()) : null;
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
}

@Override
public void rename2(String src, String dst, Rename... options)
    throws AccessControlException, DSQuotaExceededException,
    FileAlreadyExistsException, FileNotFoundException,
    NSQuotaExceededException, ParentNotDirectoryException, SafeModeException,
    UnresolvedLinkException, IOException {
  boolean overwrite = false;
  if (options != null) {
    for (Rename option : options) {
      if (option == Rename.OVERWRITE) {
        overwrite = true;
      }
    }
  }
  Rename2RequestProto req = Rename2RequestProto.newBuilder().
      setSrc(src).
      setDst(dst).setOverwriteDest(overwrite).
      build();
  try {
    rpcProxy.rename2(null, req);
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }

}

/**
 * Creates a symbolic link.
 * 
 * @see ClientProtocol#createSymlink(String, String,FsPermission, boolean) 
 */
public void createSymlink(String target, String link, boolean createParent)
    throws IOException {
  try {
    FsPermission dirPerm = 
        FsPermission.getDefault().applyUMask(dfsClientConf.uMask); 
    namenode.createSymlink(target, link, dirPerm, createParent);
  } catch (RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileAlreadyExistsException.class, 
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   NSQuotaExceededException.class, 
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/** Method to get stream returned by append call */
private DFSOutputStream callAppend(String src,
    int buffersize, Progressable progress) throws IOException {
  LocatedBlock lastBlock = null;
  try {
    lastBlock = namenode.append(src, clientName);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   SafeModeException.class,
                                   DSQuotaExceededException.class,
                                   UnsupportedOperationException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
  HdfsFileStatus newStat = getFileInfo(src);
  return DFSOutputStream.newStreamForAppend(this, src, buffersize, progress,
      lastBlock, newStat, dfsClientConf.createChecksum());
}

/**
 * Rename file or directory.
 * @see ClientProtocol#rename2(String, String, Options.Rename...)
 */
public void rename(String src, String dst, Options.Rename... options)
    throws IOException {
  checkOpen();
  try {
    namenode.rename2(src, dst, options);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   DSQuotaExceededException.class,
                                   FileAlreadyExistsException.class,
                                   FileNotFoundException.class,
                                   ParentNotDirectoryException.class,
                                   SafeModeException.class,
                                   NSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}

/**
 * Sets or resets quotas for a directory.
 * @see ClientProtocol#setQuota(String, long, long)
 */
void setQuota(String src, long namespaceQuota, long diskspaceQuota) 
    throws IOException {
  // sanity check
  if ((namespaceQuota <= 0 && namespaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       namespaceQuota != HdfsConstants.QUOTA_RESET) ||
      (diskspaceQuota <= 0 && diskspaceQuota != HdfsConstants.QUOTA_DONT_SET &&
       diskspaceQuota != HdfsConstants.QUOTA_RESET)) {
    throw new IllegalArgumentException("Invalid values for quota : " +
                                       namespaceQuota + " and " + 
                                       diskspaceQuota);

  }
  try {
    namenode.setQuota(src, namespaceQuota, diskspaceQuota);
  } catch(RemoteException re) {
    throw re.unwrapRemoteException(AccessControlException.class,
                                   FileNotFoundException.class,
                                   NSQuotaExceededException.class,
                                   DSQuotaExceededException.class,
                                   UnresolvedPathException.class,
                                   SnapshotAccessControlException.class);
  }
}