Wangda Tan commented on YARN-3142:


Sorry I missed your comment.

I agree that we can definitely do more than simply converting synchronized lock 
to R/W lock. However I think we can make this as the first step to unblock 
other JIRAs before doing more fine-grained locks. For example, I plan to rebase 
YARN-5139 on top of this patch. We can optimize more as separated patches.


> Improve locks in AppSchedulingInfo
> ----------------------------------
>                 Key: YARN-3142
>                 URL: https://issues.apache.org/jira/browse/YARN-3142
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager, scheduler
>            Reporter: Wangda Tan
>            Assignee: Varun Saxena
>         Attachments: YARN-3142.01.patch

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