[HDFS-13958] Miscellaneous Improvements for FsVolumeSpi

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.3.0
• Component/s: datanode
• Hadoop Flags: Reviewed
• Flags: Patch
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 04/Oct/18 02:33
• Updated: 05/Oct/18 16:57
• Resolved: 05/Oct/18 16:33

Description

The work in HDFS-13947 allowed for using ArrayList instead of LinkedList when scanning DataNode local directories, however the FsVolumeSpi implementations were still using (and forcing) LinkedList. I propose changing the FsVolumeSpi signatures to allow for Collection instead of LinkedList. Since I'm looking at the code, I made some small improvements and check-style fixes.

Issue Links

• relates to: HDFS-13947 Review of DirectoryScanner Class