[jira] [Created] (YARN-5387) FairScheduler: add the ability to specify a parent queue to all placement rules

["Wilfred Spiegelenburg (JIRA)" <ji...@apache.org>]

Wilfred Spiegelenburg created YARN-5387:
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             Summary: FairScheduler: add the ability to specify a parent queue to all placement rules
                 Key: YARN-5387
                 URL: https://issues.apache.org/jira/browse/YARN-5387
             Project: Hadoop YARN
          Issue Type: New Feature
          Components: fairscheduler
            Reporter: Wilfred Spiegelenburg
            Assignee: Wilfred Spiegelenburg


In the current placement policy there all rules generate a queue name under the root. The only exception is the nestedUserQueue rule. This rule allows a queue to be created under a parent queue defined by a second rule.

Instead of creating new rules to also allow nested groups, secondary groups or  nested queues for new rules that we think of we should generalise this by allowing a parent attribute to be specified in each rule like the create flag.

The optional parent attribute for a rule should allow the following values:
- empty (which is the same as not specifying the attribute)
- a rule
- a fixed value (with or without the root prefix)



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