[HDFS-8542] WebHDFS getHomeDirectory behavior does not match specification

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: webhdfs
• Hadoop Flags: Reviewed
• Assignee: Kanaka Kumar Avvaru
• Reporter: Jakob Homan
• Created: 05/Jun/15 00:33
• Updated: 31/Oct/17 15:38
• Resolved: 22/Jun/15 23:44

Description

Per the spec, WebHDFS provides a REST endpoint for getting the user's home directory:

Submit a HTTP GET request.

curl -i "http://<HOST>:<PORT>/webhdfs/v1/?op=GETHOMEDIRECTORY"

However, WebHDFSFileSystem.java does not use this, instead building the home directory locally:

  /** @return the home directory. */
  public static String getHomeDirectoryString(final UserGroupInformation ugi) {
    return "/user/" + ugi.getShortUserName();
  }

  @Override
  public Path getHomeDirectory() {
    return makeQualified(new Path(getHomeDirectoryString(ugi)));
  }

The WebHDFSFileSystem client should call to the REST service to determine the home directory.

Issue Links

• breaks: HDFS-12748 NameNode memory leak when accessing webhdfs GETHOMEDIRECTORY