[YARN-9326] Fair Scheduler configuration defaults are not documented in case of min and maxResources

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.0
• Fix Version/s: 3.3.0, 3.2.1
• Component/s: docs, documentation, fairscheduler, yarn
• Target Version/s: 3.3.0, 3.2.1
• Hadoop Flags: Reviewed
• Assignee: Adam Antal
• Reporter: Adam Antal
• Created: 22/Feb/19 11:31
• Updated: 15/Jul/19 14:53
• Resolved: 15/Jul/19 11:32

Description

The FairScheduler's configuration has the following defaults (from the code: javadoc):

In new style resources, any resource that is not specified will be set to missing or 0%, as appropriate. Also, in the new style resources, units are not allowed. Units are assumed from the resource manager's settings for the resources when the value isn't a percentage. The missing parameter is only used in the case of new style resources without percentages. With new style resources with percentages, any missing resources will be assumed to be 100% because percentages are only used with maximum resource limits.

This is not documented in the hadoop yarn site FairScheduler.html. It is quite intuitive, but still need to be documented though.