[HBASE-19682] Use Collections.emptyList() For Empty List Values

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1
• Fix Version/s: 3.0.0-alpha-1, 2.2.0
• Hadoop Flags: Reviewed
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 01/Jan/18 22:09
• Updated: 23/Apr/19 11:51
• Resolved: 01/Nov/18 16:06

Description

Use Collection.emptyList() for returning an empty list instead of return new ArrayList<> (). The default constructor creates a buffer of size 10 for ArrayList therefore, returning this static value saves on some memory and GC pressure and saves time not having to allocate a new internally buffer for each instantiation.

Issue Links

• is related to: HBASE-19675 Miscellaneous HStore Class Improvements