[HDFS-12143] Improve performance of getting and removing inode features

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.9.0, 3.0.0-beta1, 2.8.3
• Component/s: namenode
• Target Version/s: 2.8.2
• Hadoop Flags: Reviewed
• Assignee: Daryn Sharp
• Reporter: Daryn Sharp
• Created: 14/Jul/17 15:48
• Updated: 01/Aug/17 19:14
• Resolved: 25/Jul/17 15:34

Description

Getting a feature uses an iterator which is less performant than an indexed for loop. Feature lookups are becoming more prolific so cycles count.

Removing a feature requires building a string for up to 3 precondition checks. The worst case of 3 is the penalty for a successful removal.