[IMPALA-6953] Improve encapsulation within DiskIoMgr

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 2.13.0, Impala 3.1.0
• Component/s: Backend
• Target Version: Product Backlog
• Epic Color: ghx-label-7
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 30/Apr/18 18:08
• Updated: 10/Jun/18 19:04
• Resolved: 08/Jun/18 16:28

Description

While DiskIoMgr is still fresh in my mind, I should do some refactoring to improve the encapsulation within io::. Currently lots of classes are friends with each other and some code is not in the most appropriate class.