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https://issues.apache.org/jira/browse/HADOOP-3307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592481#action_12592481
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Doug Cutting commented on HADOOP-3307:
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> Why not do an equivalent of NFS mount
On unix, mounts are not managed by a filesystem implementation, but by the
kernel. If we were to add a mount mechanism, we should add it at the generic
FileSystem level, not within HDFS.
In fact, we already have a mount mechanism, but it only permits mounts by
scheme, not at any point in the path. We could add a mechanism to mount a
filesystem under an arbitrary path, or even a regex like "*.har". This could
be confusing, however, since a path that looks like an hdfs: path would really
be using some other protocol. And I don't yet see that we need to add a new
mount feature, since I think the existing one is sufficient to implement this
feature. Also, if we use "har:" or "hdfs-ar:" then it is clear that these are
not normal HDFS files.
A feature that might be good to add to the generic FileSystem is symbolic
links. Then one could add a link in HDFS to an archive URI, thus grafting it
into the namespace. If one linked hdfs://host:port/dir/foo/ to
hdfs-ar://host:port/dir/foo.har then one could list the files in the former to
get the uris in the latter. But that's beyond the scope of this issue. This
would be good future work to make transparent archives possible.
> Archives in Hadoop.
> -------------------
>
> Key: HADOOP-3307
> URL: https://issues.apache.org/jira/browse/HADOOP-3307
> Project: Hadoop Core
> Issue Type: New Feature
> Components: fs
> Reporter: Mahadev konar
> Assignee: Mahadev konar
> Fix For: 0.18.0
>
>
> This is a new feature for archiving and unarchiving files in HDFS.
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