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https://issues.apache.org/jira/browse/YARN-3141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15497307#comment-15497307
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Daniel Templeton commented on YARN-3141:
----------------------------------------

bq. Are you OK with doing such detailed improvements as a separate task? Let's 
try to make this patch simply convert synchronized lock to R/W lock.

Sure.  Converting over to the R/W lock is certainly no worse than what was 
there before.

I'm OK with the last version of this patch after you clear up the checkstyle 
issues.

> Improve locks in SchedulerApplicationAttempt/FSAppAttempt/FiCaSchedulerApp
> --------------------------------------------------------------------------
>
>                 Key: YARN-3141
>                 URL: https://issues.apache.org/jira/browse/YARN-3141
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager, scheduler
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-3141.1.patch, YARN-3141.2.patch, YARN-3141.3.patch, 
> YARN-3141.4.patch, YARN-3141.5.patch
>
>
> Enhance locks in SchedulerApplicationAttempt/FSAppAttempt/FiCaSchedulerApp, 
> as mentioned in YARN-3091, a possible solution is using read/write lock. 
> Other fine-graind locks for specific purposes / bugs should be addressed in 
> separated tickets.



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