[jira] [Commented] (YARN-9879) Allow multiple leaf queues with the same name in CS

["Peter Bacsko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-9879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17009797#comment-17009797 ] 

Peter Bacsko commented on YARN-9879:
------------------------------------

[~wilfreds] based on your suggestion, here's what I came up with:

We can still maintain the HashMap with queueName->CSQueue, however we'd use two levels:
 1. Leaf queue -> full path
 2. Full path -> CSQueue object

We additionally need an extra map which tells whether a leaf queue is unique.

So after some thinking, this is the semi-pseudocode that could possibly do the job:

{noformat}
Map<String, CSQueue>fullPathQueues;
Map<String, String> leafToFullPath;
Map<String, Boolean> leafUnique;

public CSQueue getQueue(String queueName) {
  if (fullPathName(queueName)) {
    return queues.get(queueName);
  } else {
    if (leafUnique.get(queueName)) {
      String fullName = leafToFullPath.get(queueName);
      return queues.get(fullName);
    } else {
      throw new YarnException(queueName + " is not unique");
    }
  } 
}
{noformat}

Obviously methods like {{addQueue()}}, {{removeQueue()}} should be updated too.

> Allow multiple leaf queues with the same name in CS
> ---------------------------------------------------
>
>                 Key: YARN-9879
>                 URL: https://issues.apache.org/jira/browse/YARN-9879
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Gergely Pollak
>            Assignee: Gergely Pollak
>            Priority: Major
>         Attachments: DesignDoc_v1.pdf
>
>
> Currently the leaf queue's name must be unique regardless of its position in the queue hierarchy. 
> Design doc and first proposal is being made, I'll attach it as soon as it's done.



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