[YARN-10126] Use threadPool to handle async scheduling threads

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.9.1
• Component/s: capacity scheduler
• Assignee: Aihua Xu
• Reporter: Aihua Xu
• Created: 10/Feb/20 19:25
• Updated: 10/Feb/20 19:27

Description

Currently, async scheduling launches individual threads to handle scheduling requests. If there is any issues in such threads, the threads exit and no new threads get relaunched. Then eventually all the threads die and won't handle any new job scheduling.