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https://issues.apache.org/jira/browse/HADOOP-7706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15199841#comment-15199841
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Allen Wittenauer commented on HADOOP-7706:
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Flagging new system.out/err calls is pretty trivial now with Yetus.
> have the pre-commit checks run by hudson veto patches with System.out and
> System.err calls in them
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-7706
> URL: https://issues.apache.org/jira/browse/HADOOP-7706
> Project: Hadoop Common
> Issue Type: Improvement
> Components: build
> Reporter: Steve Loughran
> Assignee: Allen Wittenauer
> Priority: Minor
>
> I don't know how to do this, but we ought to get checkstyle to reject
> System.out and System.err calls, to stop them unintentionally getting into
> code. We may still need them in some places (LogLevel, external entry
> points), but those main() methods could all delegate to our own log output
> method that provides a single place where messages get printed
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