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https://issues.apache.org/jira/browse/SPARK-28606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899260#comment-16899260
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Dongjoon Hyun commented on SPARK-28606:
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This is a release blocker for 2.4.4 and 3.0.0 since we should use that script 
and docker image to generate the release.


> Update CRAN key to recover docker image generation
> --------------------------------------------------
>
>                 Key: SPARK-28606
>                 URL: https://issues.apache.org/jira/browse/SPARK-28606
>             Project: Spark
>          Issue Type: Bug
>          Components: Project Infra
>    Affects Versions: 2.4.4, 3.0.0
>            Reporter: Dongjoon Hyun
>            Priority: Blocker
>
> CRAN repo changed the key.
> - https://cran.r-project.org/bin/linux/ubuntu/README.html
> {code}
> Err:1 https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/ InRelease
>   The following signatures couldn't be verified because the public key is not 
> available: NO_PUBKEY 51716619E084DAB9
> ...
> W: GPG error: https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/ 
> InRelease: The following signatures couldn't be verified because the public 
> key is not available: NO_PUBKEY 51716619E084DAB9
> E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu 
> bionic-cran35/ InRelease' is not signed.
> {code}
> Although they changed the key, but it reuses `cran35` for R 3.6.
> {code}
> Even though R has moved to version 3.6, for compatibility the sources.list 
> entry still uses the cran3.5 designation.
> {code}
> This issue aims to recover the docker image generation first. We will verify 
> the R doc generation in a separate issue.



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