[MAPREDUCE-7242] Do Not Initialize Empty ArrayList in LocalContainerAllocator

• Type: Improvement
• Status: Patch Available
• Priority: Trivial
• Resolution: Unresolved
• Affects Version/s: 3.2.0
• Component/s: client
• Flags: Patch
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 20/Sep/19 15:19
• Updated: 20/Sep/19 18:04

Description

https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/local/LocalContainerAllocator.java#L107-L110

Just pass static empty collections and save the initialization.