[ https://issues.apache.org/jira/browse/HADOOP-13069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

zhaojianbo updated HADOOP-13069:
--------------------------------
    Description: 
Now hadoop client can proxy an other user if setting HADOOP_PROXY_USER in the environment parameters. But the mechanism can proxy only one user in a process context. The code is like:

  public synchronized 
  static UserGroupInformation getLoginUser() throws IOException {
    if (loginUser == null) {
      loginUserFromSubject(null);
    }
    return loginUser;
  }

The static variable loginUser cache the last login user.

But in some cases, we want to proxy multi users in one process context. It seems to be that the current code is not support that.Is it?

Correct me if I'm wrong. 

  was:
Now hadoop client can proxy an other user if setting HADOOP_PROXY_USER in the environment parameters. But the mechanism can proxy only one user in a process context. The code is like:
{quote}
  public synchronized 
  static UserGroupInformation getLoginUser() throws IOException {
    if (loginUser == null) {
      loginUserFromSubject(null);
    }
    return loginUser;
  }
{quote}
The static variable loginUser cache the last login user.

But in some cases, we want to proxy multi users in one process context. It seems to be that the current code is not support that.Is it?

Correct me if I'm wrong. 


> Making hadoop client proxy multi user in a process context
> ----------------------------------------------------------
>
>                 Key: HADOOP-13069
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13069
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: zhaojianbo
>
> Now hadoop client can proxy an other user if setting HADOOP_PROXY_USER in the environment parameters. But the mechanism can proxy only one user in a process context. The code is like:
>   public synchronized 
>   static UserGroupInformation getLoginUser() throws IOException {
>     if (loginUser == null) {
>       loginUserFromSubject(null);
>     }
>     return loginUser;
>   }
> The static variable loginUser cache the last login user.
> But in some cases, we want to proxy multi users in one process context. It seems to be that the current code is not support that.Is it?
> Correct me if I'm wrong. 



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