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https://issues.apache.org/jira/browse/ARROW-12887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17351987#comment-17351987
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Antoine Pitrou commented on ARROW-12887:
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Start of diff between the two builds (until and including the pip error):
https://gist.github.com/pitrou/c88ff6245f02c062b292fea56299ecde
> [CI] AppVeyor pip install failure during setup
> ----------------------------------------------
>
> Key: ARROW-12887
> URL: https://issues.apache.org/jira/browse/ARROW-12887
> Project: Apache Arrow
> Issue Type: Bug
> Components: Continuous Integration
> Reporter: Antoine Pitrou
> Priority: Blocker
>
> Last successful build:
> https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/39249718
> First failed build:
> https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/39255805
> {{pip install}} for clcache fails with a certificate verification error:
> https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/39255805/job/e96cn9q9ohib5fuw#L523
> For some reason, I cannot reproduce this on my fork (with the exact same CI
> configuration, presumably).
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