Github user Leemoonsoo commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/123#issuecomment-117427149
  
    @khalidhuseynov Thanks for the suggestion. But here's couple of reason i 
suggest.
    
    1. having `ZEPPELIN_NOTEBOOK_LOCAL_STORAGE` and 
`ZEPPELIN_NOTEBOOK_REMOTE_STORAGE` means changing configuration. That impact 
existing user.
    
    2. name 'LOCAL_STORAGE'  and 'REMOTE_STORAGE' is not appropriate. because 
user provided storage layer can be anything. It can be based on local 
filesystem, it can be based on remote storage, it can be based on something 
other.
    
    
    Here's my suggestion,
    
    Let ZEPPELIN_NOTEBOOK_STORAGE receive comma separated class name, so user 
can use 1 to n 
    storage (for now, i think it's okay only handle up to 2 storages). And 
always synchronize all the storage.
    
    I think we can keep compatibility of the configuration and generalize this 
feature in this say.
    



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