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https://issues.apache.org/jira/browse/HDFS-5523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14364259#comment-14364259
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Brandon Li commented on HDFS-5523:
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{quote}We should probably disallow nesting in this phase.{quote}
Sounds ok to me. Otherwise, it would be hard to decide the access mode, for
example: export /a is read-only but /a/b is read-write, when user traverse from
/a to /a/b, it's tricky to decide which access the user should have.
{quote}I think we should allow mounting a non-top-level directory.{quote}
In this case, we can have root as the only mount point and the users can mount
any sub-directory. This might be the easiest way to implement, but provide only
marginal security provision. Users can mount any sub-directories as long as he
has the right to do mount operation. Usually a root user is needed to do mount,
so if customers' environment has control over who can do mount, then this
option is viable solution. Of course, to add a bit more security control, the
user can choose to export multiple sub-directories instead of only root.
> Support multiple subdirectory exports in HDFS NFS gateway
> ----------------------------------------------------------
>
> Key: HDFS-5523
> URL: https://issues.apache.org/jira/browse/HDFS-5523
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: nfs
> Reporter: Brandon Li
>
> Currently, the HDFS NFS Gateway only supports configuring a single
> subdirectory export via the {{dfs.nfs3.export.point}} configuration setting.
> Supporting multiple subdirectory exports can make data and security
> management easier when using the HDFS NFS Gateway.
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