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https://issues.apache.org/jira/browse/HDFS-538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743362#action_12743362
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Jakob Homan commented on HDFS-538:
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bq. How do we distinguish between an empty directory and a non-existent file
(or directory)?
The similar method {{getFileStatus()}} returns a FileNotFoundException, which
seems the most reasonable and expected behavior.
The API documentation is exceedingly poor for this method: what happens if the
passed-in path is not a directory?
> DistributedFileSystem::listStatus incorrectly returns null for empty result
> sets
> --------------------------------------------------------------------------------
>
> Key: HDFS-538
> URL: https://issues.apache.org/jira/browse/HDFS-538
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Jakob Homan
> Assignee: Jakob Homan
>
> Currently the listStatus method returns null if no files match the request.
> This differs from the Checksum/LocalFileSystem implementation, which returns
> an empty array, and the nontvery-explict prescription of the FileSystem
> interface: "{...@return the statuses of the files/directories in the given
> patch}}" It's better to return an empty collection than have to add extra
> null checks. The method should return an empty array.
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