[HADOOP-12774] s3a should use UGI.getCurrentUser.getShortname() for username

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.8.0, 3.0.0-alpha2
• Component/s: fs/s3
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 05/Feb/16 21:51
• Updated: 01/Nov/16 10:21
• Resolved: 25/Oct/16 05:19

Description

S3a users System.getProperty("user.name") to get the username for the homedir. This is wrong, as it doesn't work on a YARN app where the identity is set by HADOOP_USER_NAME, or in a doAs clause.

Obviously, UGI.getCurrentUser.getShortname() provides that name, everywhere.

This is a simple change in the source, though testing is harder ... probably best to try in a doAs

Issue Links

• incorporates: HADOOP-13310 S3A reporting of file group as empty is harmful to compatibility for the shell.
• is related to: HADOOP-13310 S3A reporting of file group as empty is harmful to compatibility for the shell.
• is required by: HADOOP-13309 Document S3A known limitations in file ownership and permission model.
• links to: GitHub Pull Request #136