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https://issues.apache.org/jira/browse/HADOOP-2566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559293#action_12559293
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Raghu Angadi commented on HADOOP-2566:
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> I'm not sure I completely understand the distinction. In one case are you
> passing a path without any meta characters but that does not exist, and in
> the other one with metacharacters but that matches no files?
yes. e.g. following two commands have different contents in stderr:
- {{bin/hadoop fs -cat '/tmp/nonexistent*' /tmp/exists}}
- {{bin/hadoop fs -cat '/tmp/nonexistent' /tmp/exists}}
This is how the current behavior is.
> If the distinction is important then perhaps the non-existing file case
> should return null, while the non-matching expression case should return an
> empty array.
Sounds good. globPaths() can use this keep the current behavior unchanged.
> need FileSystem#globStatus method
> ---------------------------------
>
> Key: HADOOP-2566
> URL: https://issues.apache.org/jira/browse/HADOOP-2566
> Project: Hadoop
> Issue Type: Improvement
> Components: fs
> Reporter: Doug Cutting
> Assignee: Hairong Kuang
> Fix For: 0.16.0
>
>
> To remove the cache of FileStatus in DFSPath (HADOOP-2565) without hurting
> performance, we must use file enumeration APIs that return FileStatus[]
> rather than Path[]. Currently we have FileSystem#globPaths(), but that
> method should be deprecated and replaced with a FileSystem#globStatus().
> We need to deprecate FileSystem#globPaths() in 0.16 in order to remove the
> cache in 0.17.
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