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https://issues.apache.org/jira/browse/HADOOP-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563618#action_12563618
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Doug Cutting commented on HADOOP-2470:
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> I think you mean open and isDir can be replaced.
FileSystem#isDirectory() is implemented in terms of FileSystem#getFileInfo(),
so removing the DistributedFileSystem implementation should work fine, no?
And, yes, open() is still called. It's implementation on the NameNode is
identical to getBlockLocations, except for the update of a counter. So, if
that counter is not critical, open() could also be removed.
> 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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