[YARN-8975] [Submarine] Use predefined Charset object StandardCharsets.UTF_8 instead of String "UTF-8"

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Hadoop Flags: Reviewed
• Assignee: Zhankun Tang
• Reporter: Zhankun Tang
• Created: 06/Nov/18 08:04
• Updated: 28/Nov/18 23:33
• Resolved: 28/Nov/18 23:33

Description

Writer w = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");

Could be refactored to this to improve a little bit performance due to avoid string lookup:

Writer w = new OutputStreamWriter(new FileOutputStream(file), StandardCharsets.UTF_8);