The zeppelin server running on AWS EMR suddenly died from what I can tell. >From the zeppelin logs:
INFO [2015-11-24 08:18:22,987] ({qtp628811122-40} NotebookServer.java[onClose]:163) - Closed connection to 10.231.152.57 : 46619. This was the *default* installation of zeppelin that came with the cluster. I would rather not restart the entire cluster. Any one run into similar situation? I don't see any obvious way to stop/start the application. Thanks Asif FYI, tha hadoop application UI seems to indicate the zeppelin application is still running.