[jira] Commented: (HADOOP-6526) Need mapping from long principal names to local OS user names

["Owen O'Malley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806705#action_12806705 ] 

Owen O'Malley commented on HADOOP-6526:
---------------------------------------

Currently, UGI has getShortUserName which truncates the user name at the first '@' or '/'. I propose we replace that with a getLocalName that applies the configured mapping to create the local user name.

The administrator creates a file (user.mapping) with one rule per a line, the rules are attempted in the order listed in the file, and only the first rules that applies is used. '*' is a wildcard that matches 0 or more characters other than '/' and '@'. The value that matched the nth '*' is available to the rules as \n.

The translation fails with an exception if the resulting name contains either '/' or '@'.

The default rules would be:
{noformat}
*/*@* -> \1
*@* -> \1
{noformat}
which just keeps the prefix of each principal.

There will be a command line tool that you can invoke to translate a list of long names into their local equivalents.


> Need mapping from long principal names to local OS user names
> -------------------------------------------------------------
>
>                 Key: HADOOP-6526
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6526
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> We need a configurable mapping from full user names (eg. omalley@APACHE.ORG) to local user names (eg. omalley). For many organizations it is sufficient to just use the prefix, however, in the case of shared clusters there may be duplicated prefixes. A configurable mapping will let administrators resolve the issue.

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