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Date: Wed, 1 Aug 2012 18:03:04 +0000 (UTC)
From: "Owen O'Malley (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2856) Fix block protocol so that Datanodes
 don't require root or jsvc
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    [ https://issues.apache.org/jira/browse/HDFS-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426786#comment-13426786 ] 

Owen O'Malley commented on HDFS-2856:
-------------------------------------

We should move the protocol to be a handshake-based one. Devaraj, the place where we rejected the handshake was the shuffle where the number of small connections is very high. 
                
> Fix block protocol so that Datanodes don't require root or jsvc
> ---------------------------------------------------------------
>
>                 Key: HDFS-2856
>                 URL: https://issues.apache.org/jira/browse/HDFS-2856
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, security
>            Reporter: Owen O'Malley
>
> Since we send the block tokens unencrypted to the datanode, we currently start the datanode as root using jsvc and get a secure (< 1024) port.
> If we have the datanode generate a nonce and send it on the connection and the sends an hmac of the nonce back instead of the block token it won't reveal any secrets. Thus, we wouldn't require a secure port and would not require root or jsvc.

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