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https://issues.apache.org/jira/browse/HADOOP-13295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15346293#comment-15346293
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Mobin Ranjbar commented on HADOOP-13295:
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I know that hadoop uses RPC to request a service from a program located in
another nodes. But start-dfs.sh and start-yarn.sh uses SSH to trigger the
services in another nodes. The fact is my SSH Daemon will die/block after
running one or two mapreduce program and it affects only datanodes.
> Possible Vulnerability in DataNodes via SSH
> -------------------------------------------
>
> Key: HADOOP-13295
> URL: https://issues.apache.org/jira/browse/HADOOP-13295
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Mobin Ranjbar
>
> I suspected something weird in my Hadoop cluster. When I run datanodes, after
> a while my servers(except namenode) will be down for SSH Max Attempts. When I
> checked the 'systemctl status ssh', I figured out there are some invalid
> username/password attempts via SSH and the SSH daemon blocked all incoming
> connections and I got connection refused.
> I have no problem when my datanodes are not running.
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