[ZOOKEEPER-3870] Avoid out of order response and txns created with ReadOnlyZooKeeperServer

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.6.1
• Component/s: server
• Assignee: Fangmin Lv
• Reporter: Fangmin Lv
• Created: 24/Jun/20 17:57
• Updated: 01/Oct/20 03:56

Description

The current ReadOnlyZooKeeperServer was implemented with PrepRequestProcessor, which will prepare txn even in read only mode.

Also, it will fail the write request in ReadOnlyRequestProcessor, which will cause out of order response issue. 

This Jira is going to fix this by replacing the PrepRequestProcessor with CommitProcessor, same as the other learner set up.