[MAPREDUCE-871] Job/Task local files have incorrect group ownership set by LinuxTaskController binary

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.21.0
• Component/s: tasktracker
• Hadoop Flags: Reviewed
• Release Note: Fixed LinuxTaskController binary so that permissions of local files on TT are set correctly: user owned by the job-owner and group-owned by the group owner of the binary and _not_ the primary group of the TaskTracker.
• Assignee: Vinod Kumar Vavilapalli
• Reporter: Vinod Kumar Vavilapalli
• Created: 14/Aug/09 08:21
• Updated: 24/Aug/10 21:15
• Resolved: 27/Aug/09 10:18

Description

HADOOP-4491 fixed the secure permissions of local files on a TT. While testing HADOOP-4491 on a cluster, karams found out a bug. All the files/dirs have should be owned by the group corresponding to the group owner of the task-controller binary (via using getegid()) which in turn is a special group to which only TT user belongs. HADOOP-4491 incorrectly set it to primary group of the TT via getgid(), and not the special group.

Issue Links

• blocks: MAPREDUCE-856 Localized files from DistributedCache should have right access-control