[HBASE-1406] Refactor HRS

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.20.0
• Component/s: regionserver
• Assignee: Unassigned
• Reporter: Nitay Joffe
• Created: 11/May/09 20:24
• Updated: 11/Jun/22 20:36
• Resolved: 09/Feb/15 05:40

Description

The current HRS implementation is a mess, especially after ZooKeeper additions to handle Session Expired events. See HBASE-1311.
It contains logic to restart itself which caused a lot of fields to be non-final that can be. It should be split out to two separate class, one that runs HRS duties and one that watches over the first in a join/restart loop. Using this means a special event like a ZooKeeper Session Expired wouldn't require special restart code, just an abort. The new wrapper class will handle restarting.