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https://issues.apache.org/jira/browse/HDFS-538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870097#action_12870097
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Todd Lipcon commented on HDFS-538:
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Ah, I didn't know there was a prior release note - looking at the history, Rob
seems to have deleted the old one on 10/09 without putting in a new one. The
old release note also did not explain that listStatus now returns empty arrays
for empty directories instead of null.
> 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
> Fix For: 0.21.0
>
> Attachments: HDFS-538.patch
>
>
> 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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