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https://issues.apache.org/jira/browse/YARN-5028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365047#comment-16365047
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Yufei Gu commented on YARN-5028:
--------------------------------

In case of {{createAndPopulateNewRMApp}}, it uses the ApplicationACLs in 
submission context, if you replace the original one with a new object. There is 
a risk to load wrong ACL. 

Nits in the unit test:
# The first set of assert seems unnecessary to me.
{code}
    assertEquals(appId, ctx.getApplicationId());
    assertEquals("a_queue", ctx.getQueue());
    assertEquals(Collections.singletonList("a_command"),
        ctx.getAMContainerSpec().getCommands());
    assertEquals(17L, ctx.getResource().getMemorySize());
    assertEquals(schedulingPropertiesMap,
        ctx.getApplicationSchedulingPropertiesMap());
{code}
If you think it is necessary, please add some comments. 
#  For the second set, I think one assert should be enough. Something like this:
{code}
assertEquals("No prune if application state isn't FINISHED", 
schedulingPropertiesMap,
        ctx.getApplicationSchedulingPropertiesMap());
{code}

Otherwise, looks good to me. 

> RMStateStore should trim down app state for completed applications
> ------------------------------------------------------------------
>
>                 Key: YARN-5028
>                 URL: https://issues.apache.org/jira/browse/YARN-5028
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Gergo Repas
>            Priority: Major
>         Attachments: YARN-5028.000.patch, YARN-5028.001.patch, 
> YARN-5028.002.patch
>
>
> RMStateStore stores enough information to recover applications in case of a 
> restart. The store also retains this information for completed applications 
> to serve their status to REST, WebUI, Java and CLI clients. We don't need all 
> the information we store today to serve application status; for instance, we 
> don't need the {{ApplicationSubmissionContext}}. 



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