Guangya Liu created MESOS-6131:
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             Summary: Improved performance for resource flatten
                 Key: MESOS-6131
                 URL: https://issues.apache.org/jira/browse/MESOS-6131
             Project: Mesos
          Issue Type: Bug
            Reporter: Guangya Liu
            Assignee: Guangya Liu


The {{Resources::flatten}} is using {{+=}} to add single resource object, but 
this will impact the performance much as {{+=}} will invoke resource 
validation, here we should validate the role first and then call {{add}} 
directly to avoid resource validation. 



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