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https://issues.apache.org/jira/browse/HDFS-8451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14554829#comment-14554829
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Xiaoyu Yao commented on HDFS-8451:
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+1 for the fix.
> DFSClient probe for encryption testing interprets empty URI property for
> "enabled"
> ----------------------------------------------------------------------------------
>
> Key: HDFS-8451
> URL: https://issues.apache.org/jira/browse/HDFS-8451
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: encryption
> Affects Versions: 2.7.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Blocker
> Attachments: HDFS-8451-001.patch
>
> Original Estimate: 1h
> Time Spent: 0.5h
> Remaining Estimate: 0.5h
>
> HDFS-7931 added a check in DFSClient for encryption
> {{isHDFSEncryptionEnabled()}}, looking for the property
> {{"dfs.encryption.key.provider.uri"}.
> This probe returns true even if the property is empty.
> If there is an empty provider.uri property, you get an NPE when a YARN client
> tries to set up the tokens to deploy an AM.
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