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https://issues.apache.org/jira/browse/SPARK-11991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15027157#comment-15027157
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Apache Spark commented on SPARK-11991:
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User 'jcderr' has created a pull request for this issue:
https://github.com/apache/spark/pull/9975
> spark_ec2.py does not perform sanity checks on hostnames
> --------------------------------------------------------
>
> Key: SPARK-11991
> URL: https://issues.apache.org/jira/browse/SPARK-11991
> Project: Spark
> Issue Type: Bug
> Components: EC2
> Affects Versions: 1.5.2
> Reporter: Jeremy Derr
>
> `ec2/spark_ec2.py` does not perform any sanity checks on hostnames when
> testing connectivity in `is_ssh_available` and descendants.
> This causes unexpected behavior when running a cluster in a VPC subnet
> without public IPs if `--private-ips` is not given. While `--private-ips`
> should be required in this context, the failure mode currently present is
> suboptimal.
> [ ... ]
> All 1 slaves granted
> Launched master in us-west-1c, regid = r-redacted
> Waiting for AWS to propagate instance metadata...
> Waiting for cluster to enter 'ssh-ready' state…………Password:
> What has happened here is that the public dns name for the instance is a null
> string, causing the ssh check later in the script to inadvertently connect to
> localhost to test connectivity to the cluster. The password prompt here is OS
> X's sshd asking to auth the user on that connection.
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