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https://issues.apache.org/jira/browse/HDFS-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563178#comment-13563178
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Eli Collins commented on HDFS-3598:
-----------------------------------

bq. The requirement is to have a common interface for WebHDFS and 
DistributedFileSystem

IIUC the requirement for WebHDFS is (despite its name) to have the same 
interface as FileSystem. Ie it's a REST interface to Hadoop file systems. 
Otherwise HttpFS (which also uses the webhdfs protocol) will be incompatible 
with WebHDFS.
                
> WebHDFS: support file concat
> ----------------------------
>
>                 Key: HDFS-3598
>                 URL: https://issues.apache.org/jira/browse/HDFS-3598
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Plamen Jeliazkov
>
> In trunk and branch-2, DistributedFileSystem has a new concat(Path trg, Path 
> [] psrcs) method.  WebHDFS should support it.

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