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From "Roni Burd (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6426) Compress ZK YARN keys to scale up (especially AppStateData
Date Sat, 01 Apr 2017 00:19:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951854#comment-15951854
] 

Roni Burd commented on YARN-6426:
---------------------------------

I've added a patch. The compression goes from 1MB to 28K for example when using long files

> 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
>              Labels: patch
>             Fix For: 3.0.0-alpha2
>
>         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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