[YARN-6941] Allow Queue placement policies to be ordered by attribute

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Component/s: fairscheduler
• Assignee: Unassigned
• Reporter: Yufei Gu
• Created: 03/Aug/17 16:34
• Updated: 26/Feb/20 05:29
• Resolved: 10/May/18 06:34

Description

It would be nice to add a feature that would allow users to provide an "order" or "index" the placement policies should apply, rather than just the native policy order as included in the XML.
For instance, the following two examples would be the same:
Natural order:
<queuePlacementPolicy>
<rule create="false" name="specified"/>
<rule create="false" name="user"/>
<rule name="default"/>
</queuePlacementPolicy>
Indexed Order:
<queuePlacementPolicy>
<rule index="2" name="default"/>
<rule index="1" create="false" name="user"/>
<rule index="0" create="false" name="specified"/>
</queuePlacementPolicy>