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Changes
Added notebooks hanging to FAQ
Offending key in /path/to/hosts/known_hosts:2
Where 2 is the line number of the key that can be deleted. Just remove that line, save the file, and try again.
=== Why is my notebook hanging? ===
There are a couple common causes for this:
1. Currently, our Spark notebooks can only run a single Python kernel at a time. If you open multiple notebooks on the same cluster and try to run both, the second notebook will hang. Be sure to close notebooks using "Close and Halt" under the "File" dropdown.
2. The connection from PySpark to the Spark driver might be lost. Unfortunately the best way to recover from this for the moment seems to be spinning up a new cluster.
