Yufei Gu commented on YARN-5028:

Hi [~grepas], thanks for working on this. Could you elaborate on the decision 
on why these fields are kept and not others?
      // most fields in the ApplicationSubmissionContex are not needed,
      // but the following few need to be present for recovery to succeed
      if (srcCtx.getAMContainerSpec() != null) {
        context.setAMContainerSpec(new ContainerLaunchContextPBImpl());

> 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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