Github user jongyoul commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/53#issuecomment-167522456 In addition to @elbamos's comments, I hope that the community would understand that it's too hard to review a kind of this PR which has changed widely because committers may not know features well. I, however, also know some features take extensive changes. In this case, I propose that a contributor makes a feature Jira issue that includes several sub-tasks, and makes a - relatively - small PR for every sub-task. It would help review, test and merge the PR easily.
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