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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9975) Adding relogin() method to UGI
Date Tue, 17 Sep 2013 21:31:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770003#comment-13770003
] 

Kai Zheng commented on HADOOP-9975:
-----------------------------------

Based on the work by HADOOP-9797 and the family, it’s easy to implement this as the new
codes almost support it already introducing kerberosRelogin() method when refactoring the
codes for reloginFromKeytab() etc as follows. 
{code}
public interface HadoopLogin {
  public void login() throws HadoopLoginException;
  public void logout() throws HadoopLoginException;
  public void relogin() throws HadoopLoginException;
...

public class AbstractHadoopLogin implements HadoopLogin {
…
  public void relogin() throws HadoopLoginException {
    logout();
    login();
  }
…
{code}

UGI saves HadoopLoign object, which can be used to do relogin(), as follows
{code}
Public class UserGroupInformation {
  private HadoopLogin login;
  public synchronized void kerberosRelogin()  throws IOException {
          login.relogin();
  }
  public synchronized void reloginFromKeytab() throws IOException {
    kerberosRelogin();
  }
  public synchronized void reloginFromTicketCache() throws IOException {
    kerberosRelogin();
  }
…
{code}
Here it’s only needed to rename the kerberosRelogin() method to relogin().

                
> Adding relogin() method to UGI
> ------------------------------
>
>                 Key: HADOOP-9975
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9975
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>
> In current Hadoop UGI implementation, it has API methods like reloginFromKeytab() and
reloginFromTicketCache().  However, such methods are too Kerberos specific and also involves
login implementation details, it would be better to add generic relogin() method regardless
authentication mechanism. This is possible since relevant authentication specific parameters
like principal and keytab are already passed and saved in the UGI object after initial login.
 

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