Github user vrozov commented on the pull request:
https://github.com/apache/incubator-apex-core/pull/224#issuecomment-183580278
The checkstyle version upgrade is transparent for other developers and does
not require any reconfiguration, so I don't see any reason not to upgrade it.
Additionally, compared to, for example, maven plugins, where unless we face a
specific bug in the plugin we don't need to upgrade it, checkstyle is used to
analyze a new code, not the existing code where we already know how may
violations exists.
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