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https://issues.apache.org/jira/browse/HDFS-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13966692#comment-13966692
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Tsz Wo Nicholas Sze commented on HDFS-6168:
-------------------------------------------

When talking about API compatibility, it is only about public APIs but not 
private (or LimitedPrivate) APIs.  DistributedFileSystem is similar to 
DFSClient.  They are not public APIs.  User applications should not use them 
directly.  If they do, they should expect to change their code across releases 
since these classes are unstable.  BTW, the methods removed in this JIRA were 
deprecated for a long time.

> Remove deprecated methods in DistributedFileSystem
> --------------------------------------------------
>
>                 Key: HDFS-6168
>                 URL: https://issues.apache.org/jira/browse/HDFS-6168
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>             Fix For: 2.5.0
>
>         Attachments: h6168_20140327.patch, h6168_20140327b.patch
>
>
> Some methods in DistributedFileSystem are already deprecated for a long time. 
>  They should be removed.



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