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https://issues.apache.org/jira/browse/HADOOP-14124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988565#comment-15988565
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Steve Loughran commented on HADOOP-14124:
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revisiting this. S3A FS should recreate a fake directory {{/job/task}}, when
{{job/task/file}} is deleted, and there were no other entries under
{{job/task}}. Look at the method
{{S3AFileSystem.createFakeDirectoryIfNecessary()}}
> S3AFileSystem silently deletes "fake" directories when writing a file.
> ----------------------------------------------------------------------
>
> Key: HADOOP-14124
> URL: https://issues.apache.org/jira/browse/HADOOP-14124
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs, fs/s3
> Affects Versions: 2.6.0
> Reporter: Joel Baranick
> Labels: filesystem, s3
>
> I realize that you guys probably have a good reason for {{S3AFileSystem}} to
> cleanup "fake" folders when a file is written to S3. That said, that fact
> that it silently does this feels like a separation of concerns issue. It
> also leads to weird behavior issues where calls to
> {{AmazonS3Client.getObjectMetadata}} for folders work before calling
> {{S3AFileSystem.create}} but not after. Also, there seems to be no mention
> in the javadoc that the {{deleteUnnecessaryFakeDirectories}} method is
> automatically invoked. Lastly, it seems like the goal of {{FileSystem}}
> should be to ensure that code built on top of it is portable to different
> implementations. This behavior is an example of a case where this can break
> down.
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