Ajay Kumar commented on HDFS-12950:

[~jojochuang], thanks for posting the patch. LGTM. Two minor comments:
* For TestOfflineImageViewer#testWebImageViewerSecureMode we should test 
specific exception with error message using LambdaTestUtils#intercept or 
* Update the javadoc for WebImageViewer#start

> [oiv] ls will fail in  secure cluster
> -------------------------------------
>                 Key: HDFS-12950
>                 URL: https://issues.apache.org/jira/browse/HDFS-12950
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Brahma Reddy Battula
>            Assignee: Wei-Chiu Chuang
>            Priority: Major
>         Attachments: HDFS-12950.001.patch
> if we execute ls, it will throw following.
> {noformat}
> hdfs dfs -ls webhdfs://
> ls: Invalid value for webhdfs parameter "op"
> {noformat}
> When client is configured with security (i.e "hadoop.security.authentication= 
> then webhdfs will request getdelegation token which is not implemented and 
> hence it will  throw “ls: Invalid value for webhdfs parameter "op"”.

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