[YARN-9846] Use Finer-Grain Synchronization in ResourceLocalizationService

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.2.0
• Component/s: nodemanager
• Flags: Patch
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 19/Sep/19 19:42
• Updated: 20/Sep/19 21:05

Description

https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/ResourceLocalizationService.java#L788

1. Remove these synchronization blocks
2. Ensure recentlyCleanedLocalizers is thread safe