Use screen, mosh, or another tool to help work around against dropped connections

[balshor]

Dropped connections can either leave your workspace in an unclean state (eg, with Shark/BlinkDB) or cause you to lose a lot of progress (with MLBase when you need to recreate all of your models, etc.). I recommend installing and adding instructions for using screen, mosh, or another tool that will allow for recovering after a disconnection.

[andyk]

Thanks for proposing this. I think it's a really great idea.

@shivaram, does the AMI have screen on it currently? It seems like it wouldn't be too confusing for folks if we added a step that has them launch screen and perhaps explain a few crucial screen commands.

[shivaram]

I am not sure if we have it on the AMI, but I just added a yum install -y screen to the launch scripts to make sure it is there.

[shivaram]

FYI https://github.com/mesos/spark-ec2/commit/222e7275db3b91208ecb530a1d189c85658b0839