Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/556#issuecomment-208931667
They can be a good thing. It's not namespaces so much as the difficulty of
code browsing the names within them. If you end up with very generic names in
different namespaces, you need to keep a lot of mental context to know which
one is being used, and many code browsing tools won't help to disambiguate. In
general, I have found they can (though not always) hinder readability and
maintenance. For C++ library APIs, it's a different story.
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