Fix block protocol so that Datanodes don't require root or jvsc
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Key: HDFS-2856
URL: https://issues.apache.org/jira/browse/HDFS-2856
Project: Hadoop HDFS
Issue Type: Improvement
Components: contrib/raid, scripts
Reporter: Owen O'Malley
Since we send the block tokens unencrypted to the datanode, we currently start
the datanode as root 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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