Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4196#issuecomment-72139824
> The one downside is that if we don't add it to the known_hosts file then
users will be prompted when they try to say ssh into the master instance.
Yeah, this is pretty much the only risk here. If we take the view that we
can _never_ create user-observable performance regressions in maintenance
releases, then I think we can only merge this into master and not into the
maintenance branches. `spark-ec2` is pretty decoupled from the rest of the
Spark release, though, so I don't think it's a big deal to not backport this
fix to maintenance branches. I think we're probably safe to merge this into
master and mention the change in the 1.3.0 release notes. @pwendell, do you
agree?
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