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https://issues.apache.org/jira/browse/HDFS-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13415901#comment-13415901
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eric baldeschwieler commented on HDFS-2617:
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Looking at how HFTP is used it is both.  When two clusters are out of sync, 
data is moved both ways with HFTP.  And since it is always pull, you have both 
old->new and new-> old.
                
> Replaced Kerberized SSL for image transfer and fsck with SPNEGO-based solution
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-2617
>                 URL: https://issues.apache.org/jira/browse/HDFS-2617
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: security
>            Reporter: Jakob Homan
>            Assignee: Jakob Homan
>             Fix For: 2.1.0-alpha
>
>         Attachments: HDFS-2617-a.patch, HDFS-2617-b.patch, 
> HDFS-2617-config.patch, HDFS-2617-trunk.patch, HDFS-2617-trunk.patch, 
> HDFS-2617-trunk.patch, HDFS-2617-trunk.patch, hdfs-2617-1.1.patch
>
>
> The current approach to secure and authenticate nn web services is based on 
> Kerberized SSL and was developed when a SPNEGO solution wasn't available. Now 
> that we have one, we can get rid of the non-standard KSSL and use SPNEGO 
> throughout.  This will simplify setup and configuration.  Also, Kerberized 
> SSL is a non-standard approach with its own quirks and dark corners 
> (HDFS-2386).

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