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https://issues.apache.org/jira/browse/HADOOP-13310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344103#comment-15344103
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Allen Wittenauer commented on HADOOP-13310:
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The usual implementation for file systems that don't support UNIX-style
permissions is to reflect the uid and group of the owner of the current
process. This way permissions checks "just work" since they are invalid anyway.
> S3A reporting of file group as null is harmful to compatibility for the shell.
> ------------------------------------------------------------------------------
>
> Key: HADOOP-13310
> URL: https://issues.apache.org/jira/browse/HADOOP-13310
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Chris Nauroth
> Priority: Minor
>
> S3A does not persist group information in file metadata. Instead, it stubs
> the value of the group to an empty string. Although the JavaDocs for
> {{FileStatus#getGroup}} indicate that empty string is a possible return
> value, this is likely to cause compatibility problems. Most notably, shell
> scripts that expect to be able to perform positional parsing on the output of
> things like {{hadoop fs -ls}} will stop working if retargeted from HDFS to
> S3A.
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