[HADOOP-10315] Log the original exception when getGroups() fail in UGI.

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.23.10, 2.2.0
• Target Version/s: 2.8.3
• Assignee: Ted Yu
• Reporter: Kihwal Lee
• Created: 30/Jan/14 22:20
• Updated: 11/Sep/17 05:21

Description

In UserGroupInformation, getGroupNames() swallows the original exception. There have been many occasions that more information on the original exception could have helped.

  public synchronized String[] getGroupNames() {
    ensureInitialized();
    try {
      List<String> result = groups.getGroups(getShortUserName());
      return result.toArray(new String[result.size()]);
    } catch (IOException ie) {
      LOG.warn("No groups available for user " + getShortUserName());
      return new String[0];
    }
  }

Issue Links

• is depended upon by: HADOOP-12649 Improve Kerberos diagnostics and failure handling
• is duplicated by: HADOOP-12840 UGI to log@ debug stack traces when failing to find groups for a user