amazon web services - Spark Cluster on EC2 - "ssh-ready" state pops up for password -

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i trying create spark cluster on ec2 following command (i referring apache documetnation)

./spark-ec2 --key-pair=spark-cluster --identity-file=/users/abc/spark-cluster.pem --slaves=3 --region=us-west-1 --zone=us-west-1c --vpc-id=vpc-2e44594 --subnet-id=subnet-18447841 --spark-version=1.6.1 launch spark-cluster

once fire above command master , slaves getting created once process reaches 'ssh-ready' state process keeps on waiting password

below trace. have referred apache official documentation , many other documents/videos none of creations asked password. not sure whether missing something, pointer issue appreciated.

creating security group spark-cluster-master creating security group spark-cluster-slaves searching existing cluster spark-cluster in region us-west-1... spark ami: ami-1a250d3e launching instances... launched 3 slaves in us-west-1c, regid = r-32249df4 launched master in us-west-1c, regid = r-5r426bar waiting aws propagate instance metadata... **

waiting cluster enter 'ssh-ready' state..........password:

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modified spark-ec2.py script include proxy , enabled aws nat allow outbound calls


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