[MAPREDUCE-2210] Preemption does not obey job priority

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: contrib/fair-share
• Assignee: Unassigned
• Reporter: Adam Kramer
• Created: 06/Dec/10 06:31
• Updated: 07/Feb/11 23:23
• Resolved: 07/Feb/11 23:23

Description

Preemption, as it currently works, kills running tasks that are "unfair" in terms of the amount of task attention used by one job compared to another.

The bug is that pre-emption occurs such that HIGH priority jobs have their tasks killed when the cluster is filled with lower-priority jobs. Pre-emption should only be allowed to kill tasks for jobs with equal or lower priority.