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https://issues.apache.org/jira/browse/HADOOP-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563327#action_12563327
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Tsz Wo (Nicholas), SZE commented on HADOOP-2470:
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> Methods open and isDir in ClientProtocol are no longer used.

I think you mean open and isDir can be replaced.  Currently, open and isDir are 
called in a few places but they can be obviously replaced by getBlockLocations 
and getFileInfo.

> Open and isDir should be removed from ClientProtocol
> ----------------------------------------------------
>
>                 Key: HADOOP-2470
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2470
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.15.1
>            Reporter: Hairong Kuang
>
> Methods open and isDir in ClientProtocol are no longer used. DFSClient uses 
> getBlockLocations and getFileInfo instead. So open and isDir should be 
> removed from ClientProtocol.

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