Github user Savalek commented on the issue:
https://github.com/apache/zeppelin/pull/2848
@jongyoul, yes sending any change to the server is a big load. But this
will happen only if the notebook is opened by several users. The current
implementation is subject to errors in consequence of which users may lose some
of the code. Even if the second user just open the tab in the browser. This is
very annoying.---
