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https://issues.apache.org/jira/browse/HADOOP-12080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14580549#comment-14580549
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David Dobbins commented on HADOOP-12080:
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Seems to me that the assumption that Globber is making (for any file that
exists, the parent path should also exist) is reasonable, so I don't think
Globber needs to change (though it could do better to protect against the NPE).
I believe swiftfs should behave consistently with what Globber is expecting
and either:
a) don't return any child objects at all if the parent doesn't exist (i.e. baz
is not a child of /foo/bar if /foo/bar doesn't exist); or
b) allow "implicit" directories and return information for /foo/bar so long as
one or more objects exist with a prefix of /foo/bar/
> swiftfs ls fails with NPE for dirs with single file
> ---------------------------------------------------
>
> Key: HADOOP-12080
> URL: https://issues.apache.org/jira/browse/HADOOP-12080
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/swift
> Affects Versions: 2.3.0
> Reporter: David Dobbins
> Assignee: David Dobbins
> Priority: Minor
>
> NPE from Globber.java (line 230) if a directory has only one child *and*
> there is no explicit parent directory object.
> To reproduce, create an object in swift directly (not using swiftfs), e.g.
> /foo/bar/baz in container test. Then, try to ls the "directory" for that
> object:
> hdfs dfs -ls swift://test.myswift/foo/bar/*
> This fails for dirs containing single files because in Globber.java there is
> a specific test for objects with a single child. The getFileStatus() call
> returns null for the object's parent (because no explicit directory object
> was created in swift). However, Globber assumes that if the child exists
> getPath() will return an object that exist.
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