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https://issues.apache.org/jira/browse/ARROW-9470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157577#comment-17157577
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Ryan Murray commented on ARROW-9470:
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Testing locally the builds pass but spit out warnings but run fine. So does the
fmpp plugin that generates the vector code from templates. So even if we could
turn off RAT we still have to sort out that plugin. If I had to bet I would
guess they are both thread safe but we would have to check the code to be
certain (here is RAT plugin for those of you who like spelunking through svn
repos:
https://svn.apache.org/repos/asf/creadur/rat/tags/apache-rat-project-0.13/apache-rat-plugin/src/)
The parallel build is a bit faster on my development machine (3 min vs 4min) so
not drastic and I expect the CI machines are smaller/less parallel. Maybe
something to investigate if the Java project gets bigger?
> [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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