[jira] [Updated] (HDFS-6570) add api that enables checking if a user has certain permissions on a file

["Chris Nauroth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-6570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Nauroth updated HDFS-6570:
--------------------------------

    Attachment: HDFS-6570-prototype.1.patch

I'm attaching a prototype patch that defines the new API in {{FileSystem}}, {{FileContext}} and {{AbstractFileSystem}}.  To maintain compatibility for existing subclasses, I've provided a base class implementation that calls {{getFileStatus}} and then does the typical POSIX permissions check.  Any file system that supports a richer permissions model would override this logic in its subclass.

[~thejas], would you please review the API definition in {{FileSystem}}?  I'd like to make sure this meets the needs of Hive before we proceed with full implementation in HDFS and WebHDFS.  Thanks!

> add api that enables checking if a user has certain permissions on a file
> -------------------------------------------------------------------------
>
>                 Key: HDFS-6570
>                 URL: https://issues.apache.org/jira/browse/HDFS-6570
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Thejas M Nair
>            Assignee: Chris Nauroth
>         Attachments: HDFS-6570-prototype.1.patch
>
>
> For some of the authorization modes in Hive, the servers in Hive check if a given user has permissions on a certain file or directory. For example, the storage based authorization mode allows hive table metadata to be modified only when the user has access to the corresponding table directory on hdfs. There are likely to be such use cases outside of Hive as well.
> HDFS does not provide an api for such checks. As a result, the logic to check if a user has permissions on a directory gets replicated in Hive. This results in duplicate logic and there introduces possibilities for inconsistencies in the interpretation of the permission model. This becomes a bigger problem with the complexity of ACL logic.
> HDFS should provide an api that provides functionality that is similar to access function in unistd.h - http://linux.die.net/man/2/access .



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