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https://issues.apache.org/jira/browse/HADOOP-14255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966609#comment-15966609
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Steve Loughran commented on HADOOP-14255:
-----------------------------------------
LGTM
+1
thanks for this, especially the tests
> S3A to delete unnecessary fake directory objects in mkdirs()
> ------------------------------------------------------------
>
> Key: HADOOP-14255
> URL: https://issues.apache.org/jira/browse/HADOOP-14255
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Attachments: HADOOP-14255.000.patch, HADOOP-14255.001.patch
>
>
> In S3AFileSystem, as an optimization, we delete unnecessary fake directory
> objects if that directory contains at least one (nested) file. That is done
> in closing stream of newly created file. However, if the directory becomes
> non-empty after we just create an empty subdirectory, we do not delete its
> fake directory object though that fake directory object becomes "unnecessary".
> So in {{S3AFileSystem::mkdirs()}}, we have a pending TODO:
> {quote}
> // TODO: If we have created an empty file at /foo/bar and we then call
> // mkdirs for /foo/bar/baz/roo what happens to the empty file /foo/bar/?
> private boolean innerMkdirs(Path p, FsPermission permission)
> {quote}
> This JIRA is to fix the TODO: provide consistent behavior for a fake
> directory object between its nested subdirectory and nested file by deleting
> it.
> See related discussion in [HADOOP-14236]. Thanks [~ste...@apache.org] for
> discussion.
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