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https://issues.apache.org/jira/browse/HADOOP-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699194#action_12699194
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dhruba borthakur commented on HADOOP-5143:
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Another use case: if one opens a file for reading (via FSDataInputStream) and
then wants to find the length of the file (without making a separate FileStatus
RPC to the namanode)
> Add a method to get file length for Seekable, FSDataInputStream and libhdfs
> ---------------------------------------------------------------------------
>
> Key: HADOOP-5143
> URL: https://issues.apache.org/jira/browse/HADOOP-5143
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs, fs, libhdfs
> Affects Versions: 0.18.2
> Reporter: Qi Liu
> Attachments: HADOOP-5143.patch, hadoop.patch
>
>
> When open any seekable file, it should be able to get the length of the file
> via Seekable interface, since the seek method should be able to detect
> seeking beyond the end of file. Such interface can benefit distributed file
> systems by saving a network round-trip of
> FileSystem.getFileStatus(Path).getLen() for any open file.
> In libhdfs, such interface should also be exposed to make native program
> taking advantage of this change.
> I have the changes locally for all FSInputStream concrete classes. The change
> can be considered trivial, since some of the FSInputStream classes already
> have a method named getFileLength(), or a member field named size/length/end.
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