Jeremy Derr created SPARK-11991:
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Summary: 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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