Github user felizbear commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/796#issuecomment-206086712
  
    @johnnyws I understand. The key in map-based implementation should be 
`notebookId` because it's unique. That said, I don't want to push you with this 
approach. If you think that list-based implementation does the job well and is 
maintainable, then let's keep it. It would benefit from a slight refactoring, 
in my opinion, just to make the code more readable.
    
    The problem of adding backward compatibility for duplicate names is 
probably out of scope of this PR. 
    In my opinion, duplicated names shall not be allowed. I struggle to see any 
valid use case here. On the front-end, backward compatibility problem could 
potentially be solved by adding a unique postfix to names (e.g. notebook id) in 
the model that isn't displayed in the view.


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