wilfred-s opened a new pull request, #724:
URL: https://github.com/apache/yunikorn-core/pull/724

   ### What is this PR for?
   When a node gets removed the partition resources and thus the root max 
resources are decreased. Cleanup of the allocations happens after that. This 
means that for a short period of time the root queue max resources are already 
decreased while the usage is not.
   
   If the queue headroom is limited by the root queue then we could have a race 
between the removal of the node allocations and scheduling adding a new 
allocation. Scheduling could fail with the root queue usage being over the max 
resources.
   
   ### What type of PR is it?
   * [X] - Bug Fix
   
   ### What is the Jira issue?
   * https://issues.apache.org/jira/browse/YUNIKORN-2171
   
   ### How should this be tested?
   not been able to find a way to test this


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