[HDFS-16075] Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4.0, 3.3.2
• Labels: pull-request-available
• Target Version/s: 3.4.0, 3.3.2
• Assignee: Viraj Jasani
• Reporter: Viraj Jasani
• Created: 17/Jun/21 09:25
• Updated: 21/Jun/21 01:30
• Resolved: 21/Jun/21 01:30

Description

StorageType and DatanodeInfo already provides empty array constants. We should use them where possible in order to avoid creating unnecessary new empty array objects.

Issue Links

• links to: GitHub Pull Request #3115
• links to: https://github.com/apache/hadoop/pull/3115