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https://issues.apache.org/jira/browse/HDFS-3282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255891#comment-13255891
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Tsz Wo (Nicholas), SZE commented on HDFS-3282:
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> change DistributedFileSystem.open(..) to return HdfsDataInputStream.

Let me clarify it: the return type is HdfsDataInputStream but the return object 
is still DFSDataInputStream so that users could cast the stream to 
DFSDataInputStream as before.  We also have to keep the DFSDataInputStream 
constructor.
                
> Expose getFileLength API.
> -------------------------
>
>                 Key: HDFS-3282
>                 URL: https://issues.apache.org/jira/browse/HDFS-3282
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client
>    Affects Versions: 3.0.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>
> This JIRA is to expose the getFileLength API through a new public 
> DistributedFileSystemInfo class.
> I would appreciate if someone suggest good name for this public class.
> Nicholas, did you plan any special design for this public client class?

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