[HDFS-8751] Remove setBlocks API from INodeFile and misc code cleanup

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 10/Jul/15 06:04
• Updated: 30/Aug/16 01:31
• Resolved: 10/Jul/15 21:19

Description

The public INodeFile#setBlocks API, when used outside INodeFile, is always called with null. Therefore we should replace it with a safer clearBlocks API. Also merging code cleanups from HDFS-7285 branch.