Github user sejunra commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/640#issuecomment-172171295 @Leemoonsoo kept it on manual instead of your recommended /interpreter folder as it made more sense under /manual which is more how-tos and not related to interpreters (though it's specific to spark). If you feel strongly about the /interpreter location, I can move it.
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