[ROCKETMQ-173] Add comment to HA code base

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Later
• Fix Version/s: 4.2.0
• Component/s: rocketmq-store
• Assignee: Xinyu Zhou
• Reporter: Jaskey Lam
• Created: 12/Apr/17 13:30
• Updated: 13/Dec/17 09:31
• Resolved: 13/Dec/17 09:31

Description

The HA service is the very crucial part for rocketmq and the code base is hard to understand.

For now, it is lack of comment in the code base which makes it even harder.

The comment should be added in the code base to make it easier to understand and maintain.