zuston opened a new pull request, #6623:
URL: https://github.com/apache/hadoop/pull/6623

   ### Description of PR
   When using the `SingleConstraintAppPlacementAllocator` with scheduling 
request in our internal cluster, I found the huge performance regression from 
the metric of `allocateAvgTime`. 
   
   After digging this bug, I found this dangerous bug that will always checking 
the non-pending resource apps due to missing of desc pending resource for one 
app for the async scheduling threads.
   
   
   ### How was this patch tested?
   
   Has been applied in our internal cluster
   
   ### For code changes:
   
   - [ ] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   - [ ] Object storage: have the integration tests been executed and the 
endpoint declared according to the connector-specific documentation?
   - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, 
`NOTICE-binary` files?
   
   


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