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https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Peng Zhang updated YARN-3405:
-----------------------------
    Description: 
Queue hierarchy described as below:
{noformat}
             root
              |         \
           queue-1    queue-2       
          /      \
queue-1-1        queue-1-2
{noformat}

1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not 
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.

  was:
Queue hierarchy described as below:
{noformat}
             root
              |         
           queue-1        
          /      \
queue-1-1        queue-1-2
{noformat}

1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not 
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.


> FairScheduler's preemption cannot happen between sibling in some case
> ---------------------------------------------------------------------
>
>                 Key: YARN-3405
>                 URL: https://issues.apache.org/jira/browse/YARN-3405
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.7.0
>            Reporter: Peng Zhang
>            Priority: Critical
>
> Queue hierarchy described as below:
> {noformat}
>              root
>               |         \
>            queue-1    queue-2       
>           /      \
> queue-1-1        queue-1-2
> {noformat}
> 1. When queue-1-1 is active and it has been assigned with all resources.
> 2. When queue-1-2 is active, and it cause some new preemption request.
> 3. But when do preemption, it now starts from root, and found queue-1 is not 
> over fairshare, so no recursion preemption to queue-1-1.
> 4. Finally queue-1-2 will be waiting for resource release form queue-1-1 
> itself.



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