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https://issues.apache.org/jira/browse/ARROW-9470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157598#comment-17157598
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Antoine Pitrou commented on ARROW-9470:
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It turns out the RAT plugin is also stupid, it fails if any non-checked-in file
doesn't have a license header (I had a helper script {{build.sh}} in my
{{java}} directory...).
> [CI][Java] Run Maven in parallel
> --------------------------------
>
> Key: ARROW-9470
> URL: https://issues.apache.org/jira/browse/ARROW-9470
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Continuous Integration, Developer Tools, Java
> Reporter: Antoine Pitrou
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> It looks like Maven nowadays supports multi-threaded builds, but we're not
> using them:
> https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3
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