[YARN-5982] Simplify opportunistic container parameters and metrics

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Target Version/s: 2.9.0, 3.0.0-alpha2
• Assignee: Konstantinos Karanasos
• Reporter: Konstantinos Karanasos
• Created: 08/Dec/16 06:30
• Updated: 30/Dec/16 02:08
• Resolved: 10/Dec/16 03:44

Description

This JIRA removes some of the parameters that are related to opportunistic containers (e.g., min/max memory/cpu). Instead, we will be using the parameters already used by guaranteed containers.
The goal is to reduce the number of parameters that need to be used by the user.

We also fix a small issue related to the container metrics (opportunistic memory reported in GB in Web UI, although it was in MB).