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https://issues.apache.org/jira/browse/HDFS-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058082#comment-14058082
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Haohui Mai commented on HDFS-2856:
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Tested the latest patch on a secure cluster running under Mac OS X. Worked as
expected.
One comment: the DN continues to start if {{dfs.block.access.token.enable}}
equals to {{false}} (which is the default). Maybe it is better to bail out
instead as webhdfs won't work in this configuration.
> 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: datanode, security
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Owen O'Malley
> Assignee: Chris Nauroth
> Attachments: Datanode-Security-Design.pdf,
> Datanode-Security-Design.pdf, Datanode-Security-Design.pdf,
> HDFS-2856-Test-Plan-1.pdf, HDFS-2856.1.patch, HDFS-2856.2.patch,
> HDFS-2856.3.patch, HDFS-2856.4.patch, HDFS-2856.5.patch, HDFS-2856.6.patch,
> HDFS-2856.prototype.patch
>
>
> 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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