[YARN-2144] Add logs when preemption occurs

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.5.0
• Component/s: capacityscheduler
• Assignee: Wangda Tan
• Reporter: Tassapol Athiapinya
• Created: 10/Jun/14 22:51
• Updated: 10/Jul/14 00:40
• Resolved: 10/Jul/14 00:40

Description

There should be easy-to-read logs when preemption does occur.

RM logs should have following properties:

• Logs are retrievable when an application is still running and often flushed.
• Can distinguish between AM container preemption and task container preemption with container ID shown.
• Should be INFO level log.