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https://issues.apache.org/jira/browse/HADOOP-10391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13923215#comment-13923215
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Chris Nauroth commented on HADOOP-10391:
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Let's also add a unit test for "none" as part of fixing this.
> HADOOP-10211 change for comma-separated list of QOP values broke
> backwards-compatibility with existing configs.
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-10391
> URL: https://issues.apache.org/jira/browse/HADOOP-10391
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.4.0
> Reporter: Chris Nauroth
> Priority: Blocker
>
> HADOOP-10211 changed parsing of QOP values to support a comma-separated list.
> This change accidentally broke backwards-compatibility with existing
> configs. Previously, an unrecognized value caused it to default to
> authentication. Now, an unrecognized value causes
> {{IllegalArgumentException}}. Some deployments had been using a value of
> "none" in insecure clusters, so the change would break those existing
> deployments.
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