Github user echarles commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/795#issuecomment-201143067
  
    I don't in the src any change on the SparkInterpeter to deal with this new 
conf.
    
    About default, sharing variables between notes is sometimes not the goal, 
but sometimes it is exactly what you want (I often work in the latter way than 
the former) - leaving defauilt to `shared` sounds good to me.
    
    Not all intrerpreter would support all those modes, especially the 
`process` one. If we want a full solution, we should be able to configure a 
list of supported mode per interpreter...
    
    Btw, to understand what `process` means, I had to RTFM, which is not the 
best. Maybe we should have a look to other interpreter cases and see if there 
are other ideas.
    
    Things will still get harder when Zeppelin will support true multi user: 
there would be options to share (or not) context between users.


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