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https://issues.apache.org/jira/browse/HADOOP-2229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546060
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Hairong Kuang commented on HADOOP-2229:
---------------------------------------
Since HADOOP-1701 is still under debate, this issue intends to provide the
minumum abstraction that needs to support file/directory permission in dfs. It
defines a Writable interface called UserGroupInformation that contains user
name, the names of the groups that it belongs to, and its umask.
{code}
public interface UserGroupInformation extends Writable {
/** Get username */
public String getUserName();
/*** Get the name of the groups that the user belong to */
public String[] getGroupNames();
/** Get the default group name. */
public String getDefaultGroupName();
/** Get the user's umask. */
public short getUMask();
}
{code}
It also provides a Unix implementation of the UGI interface. The
implementation additionly provides a static method login with the following
signature:
{code} public static UnixUserGroupInformation login(Configuration conf) throws
LoginException; {code}
It allows to construct a UnixUserGroupInformation object either from conf if it
is contained there or from the underlying Unix system.
> Provide a simple login implementation
> -------------------------------------
>
> Key: HADOOP-2229
> URL: https://issues.apache.org/jira/browse/HADOOP-2229
> Project: Hadoop
> Issue Type: New Feature
> Affects Versions: 0.15.0
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Hairong Kuang
> Fix For: 0.16.0
>
>
> Give a simple implementation of HADOOP-1701. Hadoop clients are assumed to
> be started within a Unix-like network which provides user and group
> management. This implementation read user information from the OS and send
> them to the NameNode in plaintexts through RPC (see also HADOOP-2184).
> NameNode trusts all information given and uses them for permission checking.
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