[HADOOP-17020] Improve RawFileSystem Performance

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.3.1
• Component/s: fs
• Assignee: Mehakmeet Singh
• Reporter: Rajesh Balamohan
• Created: 29/Apr/20 12:10
• Updated: 19/Jun/20 13:37
• Resolved: 17/Jun/20 15:18

Description

Improving RawFileSystem performance.

Changes:

• RawLocalFileSystem could localize the default block size to avoid sync bottleneck with a Configuration object.
  https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/RawLocalFileSystem.java#L666
• Exists() override method for optimization.