Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/221#issuecomment-132270605
This is where you can define your variable in ZeppelinConfiguration
https://github.com/apache/incubator-zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/conf/ZeppelinConfiguration.java#L369
This is how to read the variable
https://github.com/apache/incubator-zeppelin/blob/master/zeppelin-server/src/main/java/org/apache/zeppelin/socket/NotebookServer.java#L290
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