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https://issues.apache.org/jira/browse/HDFS-9525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141238#comment-15141238
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Steve Loughran commented on HDFS-9525:
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I understand more, but I'm worried that if a token file is missing, and you
don't have the credentials, there's going to be no explanation of what has gone
wrong.
Currently, the env-var mechanism is usually used as an alternative to being
kinited in or having a keytab. It only makes sense to downgrade if you are —or
can be— logged in. Without that option, then when you try to access the webhdfs
filesystem, the user sees a message about no TGT, and doesn't understand the
root cause was that even though a location was set in the cluster
config/command line, it wasn't actually there.
That's what I'm worried about: finding problems early, and why I'm advocating
throwing an FNFE if a named file isn't there.
If you think differently, then at the very least,
# the fact that a named file is missing needs to be logged @ info.
# kdiag should check for all the files and fail fast if they are missing.
> hadoop utilities need to support provided delegation tokens
> -----------------------------------------------------------
>
> Key: HDFS-9525
> URL: https://issues.apache.org/jira/browse/HDFS-9525
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: security
> Affects Versions: 3.0.0
> Reporter: Allen Wittenauer
> Assignee: HeeSoo Kim
> Priority: Blocker
> Fix For: 3.0.0
>
> Attachments: HDFS-7984.001.patch, HDFS-7984.002.patch,
> HDFS-7984.003.patch, HDFS-7984.004.patch, HDFS-7984.005.patch,
> HDFS-7984.006.patch, HDFS-7984.007.patch, HDFS-7984.patch,
> HDFS-9525.008.patch, HDFS-9525.009.patch, HDFS-9525.009.patch,
> HDFS-9525.branch-2.008.patch, HDFS-9525.branch-2.009.patch
>
>
> When using the webhdfs:// filesystem (especially from distcp), we need the
> ability to inject a delegation token rather than webhdfs initialize its own.
> This would allow for cross-authentication-zone file system accesses.
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