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https://issues.apache.org/jira/browse/HADOOP-948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468402
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Doug Cutting commented on HADOOP-948:
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CheckStyle is LGPL, so cannot be included in an Apache project.
I would not oppose someone submitting a patch that adds style checking to the
"test" target, so that tests fail if style is incorrect. In general, the
"test" target should test for patch acceptability.
> Coding style issues
> --------------------
>
> Key: HADOOP-948
> URL: https://issues.apache.org/jira/browse/HADOOP-948
> Project: Hadoop
> Issue Type: Bug
> Components: metrics
> Reporter: David Bowen
> Priority: Minor
> Attachments: hadoop-948.patch
>
>
> I would like to recommend some mainly stylistic changes in the recent fix of
> http://issues.apache.org/jira/browse/HADOOP-886. The file in question is
> CodeFactory.java, and the reasons for the changes are:
> * It is generally preferable to avoid multiple return statements.
> * It is nearly always preferable to use curly braces and a newline after
> an if (condition).
> * There's no benefit to doing the hash lookup twice in the common case (by
> calling contains and then get).
> (1) and (2) are commonly found in Java coding style guidelines as they make
> the code more readable.
> I'll attach the fix shortly.
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