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Spark 2 on Hortonworks Data Platform 2.5 Sandbox

Since apparently there are still issues with using Spark2 from Zeppelin, you may want to switch to shell to use Spark2 with HDP 2.5.

Summarizing the flow (learned it the hard way):
Connect via SSH to the sandbox (e.g. Putty on Windows) on port 2122. This will allow you to use copy-paste (vs console in VirtualBox)
username: root
password (default): hadoop

SSH into the docker container that runs HDPssh root@

username: root
password (default): hadoop

Make sure you use Spark2

Run Spark shell
cd /usr/hdp/current/spark2-client/bin

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