Github user andreaTP commented on the issue:
https://github.com/apache/zeppelin/pull/2483
yes of course @felixcheung , basically I'm exposing through maven
properties the ability for users to customize where to download from certain
packets that are normally downloaded from very specific internet resources.
In this way one can build zeppelin from sources specifying faster or
internal or more reliable addresses for those packages.
You can note that this does not break anything but just expose some plugin
capabilities to users and fallback to proper default one.
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