[HADOOP-12081] Fix UserGroupInformation.java to support 64-bit zLinux

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: security
• Labels: zlinux

Environment

zLinux

• Target Version/s: 2.8.0
• Assignee: Akira Ajisaka
• Reporter: Adam Roberts
• Created: 10/Jun/15 17:30
• Updated: 30/Aug/16 05:40
• Resolved: 21/Jul/15 02:25

Description

Currently the 64 bit check in security/UserGroupInformation.java uses os.arch and checks for "64". s390x is returned on IBM's z platform: s390x is 64 bit. Without this change, if we try to use HDFS with Spark, we get a fatal error (unable to login as we can't find a login class).

This address fixes said issue by identifying s390x as a 64 bit platform and thus allowing Spark to run on zLinux. A simple fix with very big implications!