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https://issues.apache.org/jira/browse/HDFS-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419642#comment-13419642
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Eli Collins commented on HDFS-2617:
-----------------------------------
If security was enabled the default was not no authentication, that's why this
change is incompatible.
I think the alternative option Eric is referring to is to default
use-weak-http-crypto to true, which means people with secure clusters who just
update their bits don't switch from kssl to spnego automatically, ie they'd
have to explicitly enable spnego via setting use-weak-http-crypto to false.
Fortunately people can override this and ship with use-weak-http-crypto true.
> 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: 1.2.0, 2.1.0-alpha
>
> Attachments: HDFS-2617-a.patch, HDFS-2617-b.patch,
> HDFS-2617-branch-1.patch, HDFS-2617-branch-1.patch, HDFS-2617-branch-1.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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