[HIVE-14403] LLAP node specific preemption will only preempt once on a node per AM

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 2.1.1
• Target Version/s: 2.1.1
• Assignee: Siddharth Seth
• Reporter: Siddharth Seth
• Created: 02/Aug/16 18:45
• Updated: 08/Dec/16 14:15
• Resolved: 03/Aug/16 16:43

Description

Query hang reported by cartershanklin

Turns out that once an AM has preempted a task on a node for locality, it will not be able to preempt another task on the same node (specifically for local requests)

Manifests as a query hanging. It's possible for a previous query to interfere with a subsequent query since the AM is shared.