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https://issues.apache.org/jira/browse/HDFS-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13911045#comment-13911045
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Aaron T. Myers commented on HDFS-5939:
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bq. You might want to remove this message as well.

I'd recommend getting rid of the "expected" variable as well and just use 
{{GenericTestUtils#assertExceptionContains}}.

> WebHdfs returns misleading error code and logs nothing if trying to create a 
> file with no DNs in cluster
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5939
>                 URL: https://issues.apache.org/jira/browse/HDFS-5939
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.3.0
>            Reporter: Yongjun Zhang
>            Assignee: Yongjun Zhang
>         Attachments: HDFS-5939.001.patch, HDFS-5939.002.patch, 
> HDFS-5939.003.patch, HDFS-5939.004.patch, HDFS-5939.005.patch, 
> HDFS-5939.006.patch
>
>
> When trying to access hdfs via webhdfs, and when datanode is dead, user will 
> see an exception below without any clue that it's caused by dead datanode:
> $ curl -i -X PUT 
> ".../webhdfs/v1/t1?op=CREATE&user.name=<userName>&overwrite=false"
> ...
> {"RemoteException":{"exception":"IllegalArgumentException","javaClassName":"java.lang.IllegalArgumentException","message":"n
>  must be positive"}}
> Need to fix the report to give user hint about dead datanode.



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