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https://issues.apache.org/jira/browse/HADOOP-4131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629512#action_12629512
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Steve Loughran commented on HADOOP-4131:
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except now the node is exporting your ~/.ssh dir to anyone the firewall blocked
hasn't blocked off who is willing to pretend to be you, which implies that you
are giving full rights to anyone nearby.
Ideally, every client machine should pick up the public SSH key they trust from
somewhere secure (metadata? /root/.ssh/authorized_keys); only the master(s)
would have the private key needed to gain access.
> Allow use of hadoop scripts on EC2
> ----------------------------------
>
> Key: HADOOP-4131
> URL: https://issues.apache.org/jira/browse/HADOOP-4131
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/ec2
> Reporter: Tom White
> Assignee: Tom White
> Fix For: 0.19.0
>
>
> Currently the Hadoop control scripts do not work on EC2 since instances do
> not have ssh access to one another. This is inconvenient as it makes it
> impossible to restart the cluster after a configuration change, for example.
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