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https://issues.apache.org/jira/browse/YARN-6426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17802723#comment-17802723
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Shilun Fan commented on YARN-6426:
----------------------------------

Bulk update: moved all 3.4.0 non-blocker issues, please move back if it is a 
blocker. Retarget 3.5.0.

> Compress ZK YARN keys to scale up (especially AppStateData
> ----------------------------------------------------------
>
>                 Key: YARN-6426
>                 URL: https://issues.apache.org/jira/browse/YARN-6426
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: yarn
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Roni Burd
>            Assignee: Roni Burd
>            Priority: Major
>              Labels: patch
>         Attachments: zkcompression.patch
>
>
> ZK today stores the protobuf files uncompressed. This is not an issue except 
> that if a customer job has thousands of files, AppStateData will store the 
> user context as a string with multiple URLs and it is easy to get to 1MB or 
> more. 
> This can put unnecessary strain on ZK and make the process slow. 
> The proposal is to simply compress protobufs before sending them to ZK



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