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https://issues.apache.org/jira/browse/YARN-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121530#comment-16121530
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Rohith Sharma K S commented on YARN-65:
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thanks [~maniraj...@gmail.com] for the patch. 
Clearing AMContainer launch context should not be done unless application is 
completed. It is always buggy!! And also I see existing code also a buggy which 
clears {{app.submissionContext.getAMContainerSpec().setTokensConf(null);}}. 
After application is submitted, at any point of time application can be 
updated. During application update, we also stores application submission 
context back to RMStateStore which overrides. And if RM restart after app 
update then it is a issue.

As a solution, unused fields must be cleared only after app is finished may be 
in final transition. 

> Reduce RM app memory footprint once app has completed
> -----------------------------------------------------
>
>                 Key: YARN-65
>                 URL: https://issues.apache.org/jira/browse/YARN-65
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 0.23.3
>            Reporter: Jason Lowe
>            Assignee: Manikandan R
>         Attachments: YARN-65.001.patch, YARN-65.002.patch, YARN-65.003.patch, 
> YARN-65.004.patch, YARN-65.005.patch, YARN-65.006.patch, YARN-65.007.patch
>
>
> The ResourceManager holds onto a configurable number of completed 
> applications (yarn.resource.max-completed-applications, defaults to 10000), 
> and the memory footprint of these completed applications can be significant.  
> For example, the {{submissionContext}} in RMAppImpl contains references to 
> protocolbuffer objects and other items that probably aren't necessary to keep 
> around once the application has completed.  We could significantly reduce the 
> memory footprint of the RM by releasing objects that are no longer necessary 
> once an application completes.



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