import org.apache.hadoop.lib.servlet.FileSystemReleaseFilter; //导入依赖的package包/类
/**
 * Returns a filesystem instance. The fileystem instance is wired for release at the completion of
 * the current Servlet request via the {@link FileSystemReleaseFilter}.
 * <p>
 * If a do-as user is specified, the current user must be a valid proxyuser, otherwise an
 * <code>AccessControlException</code> will be thrown.
 *
 * @param ugi principal for whom the filesystem instance is.
 *
 * @return a filesystem for the specified user or do-as user.
 *
 * @throws IOException thrown if an IO error occurred. Thrown exceptions are
 * handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException thrown if a FileSystemAccess releated error occurred. Thrown
 * exceptions are handled by {@link HttpFSExceptionProvider}.
 */
private FileSystem createFileSystem(UserGroupInformation ugi)
    throws IOException, FileSystemAccessException {
  String hadoopUser = ugi.getShortUserName();
  FileSystemAccess fsAccess = HttpFSServerWebApp.get().get(FileSystemAccess.class);
  Configuration conf = HttpFSServerWebApp.get().get(FileSystemAccess.class).getFileSystemConfiguration();
  FileSystem fs = fsAccess.createFileSystem(hadoopUser, conf);
  FileSystemReleaseFilter.setFileSystem(fs);
  return fs;
}
 

import org.apache.hadoop.lib.servlet.FileSystemReleaseFilter; //导入依赖的package包/类
/**
 * Returns a filesystem instance. The fileystem instance is wired for release at the completion of
 * the current Servlet request via the {@link FileSystemReleaseFilter}.
 * <p/>
 * If a do-as user is specified, the current user must be a valid proxyuser, otherwise an
 * <code>AccessControlException</code> will be thrown.
 *
 * @param ugi principal for whom the filesystem instance is.
 *
 * @return a filesystem for the specified user or do-as user.
 *
 * @throws IOException thrown if an IO error occurred. Thrown exceptions are
 * handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException thrown if a FileSystemAccess releated error occurred. Thrown
 * exceptions are handled by {@link HttpFSExceptionProvider}.
 */
private FileSystem createFileSystem(UserGroupInformation ugi)
    throws IOException, FileSystemAccessException {
  String hadoopUser = ugi.getShortUserName();
  FileSystemAccess fsAccess = HttpFSServerWebApp.get().get(FileSystemAccess.class);
  Configuration conf = HttpFSServerWebApp.get().get(FileSystemAccess.class).getFileSystemConfiguration();
  FileSystem fs = fsAccess.createFileSystem(hadoopUser, conf);
  FileSystemReleaseFilter.setFileSystem(fs);
  return fs;
}
 

import org.apache.hadoop.lib.servlet.FileSystemReleaseFilter; //导入依赖的package包/类
/**
 * Returns a filesystem instance. The fileystem instance is wired for release at the completion of
 * the current Servlet request via the {@link FileSystemReleaseFilter}.
 * <p/>
 * If a do-as user is specified, the current user must be a valid proxyuser, otherwise an
 * <code>AccessControlException</code> will be thrown.
 *
 * @param user principal for whom the filesystem instance is.
 * @param doAs do-as user, if any.
 *
 * @return a filesystem for the specified user or do-as user.
 *
 * @throws IOException thrown if an IO error occurred. Thrown exceptions are
 * handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException thrown if a FileSystemAccess releated error occurred. Thrown
 * exceptions are handled by {@link HttpFSExceptionProvider}.
 */
private FileSystem createFileSystem(Principal user, String doAs) throws IOException, FileSystemAccessException {
  String hadoopUser = getEffectiveUser(user, doAs);
  FileSystemAccess fsAccess = HttpFSServerWebApp.get().get(FileSystemAccess.class);
  Configuration conf = HttpFSServerWebApp.get().get(FileSystemAccess.class).getFileSystemConfiguration();
  FileSystem fs = fsAccess.createFileSystem(hadoopUser, conf);
  FileSystemReleaseFilter.setFileSystem(fs);
  return fs;
}
 

import org.apache.hadoop.lib.servlet.FileSystemReleaseFilter; //导入依赖的package包/类
/**
 * Returns a filesystem instance. The fileystem instance is wired for release
 * at the completion of
 * the current Servlet request via the {@link FileSystemReleaseFilter}.
 * <p/>
 * If a do-as user is specified, the current user must be a valid proxyuser,
 * otherwise an
 * <code>AccessControlException</code> will be thrown.
 *
 * @param user
 *     principal for whom the filesystem instance is.
 * @param doAs
 *     do-as user, if any.
 * @return a filesystem for the specified user or do-as user.
 * @throws IOException
 *     thrown if an IO error occurred. Thrown exceptions are
 *     handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException
 *     thrown if a FileSystemAccess releated error occurred. Thrown
 *     exceptions are handled by {@link HttpFSExceptionProvider}.
 */
private FileSystem createFileSystem(Principal user, String doAs)
    throws IOException, FileSystemAccessException {
  String hadoopUser = getEffectiveUser(user, doAs);
  FileSystemAccess fsAccess =
      HttpFSServerWebApp.get().get(FileSystemAccess.class);
  Configuration conf = HttpFSServerWebApp.get().get(FileSystemAccess.class)
      .getFileSystemConfiguration();
  FileSystem fs = fsAccess.createFileSystem(hadoopUser, conf);
  FileSystemReleaseFilter.setFileSystem(fs);
  return fs;
}