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https://issues.apache.org/jira/browse/SPARK-1204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14272828#comment-14272828
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Shivaram Venkataraman commented on SPARK-1204:
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No - This was fixed in
https://github.com/apache/spark/commit/b98572c70ad3932381a55f23f82600d7e435d2eb
We generate a new ssh key on the master for each cluster launch and then copy
that to all the slave machines
> EC2 scripts upload private key
> ------------------------------
>
> Key: SPARK-1204
> URL: https://issues.apache.org/jira/browse/SPARK-1204
> Project: Spark
> Issue Type: Improvement
> Components: EC2
> Affects Versions: 0.8.1
> Reporter: Jaka Jancar
> Priority: Minor
>
> The EC2 scripts upload the private key that you supply.
> At least, this needs to be clearly documented in --help.
> Ideally, only the public key would be uploaded to all the instances. For the
> instances to connect to one another, a fresh key should be generated (locally
> or on the master).
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