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From D vd Reddy <dvdeepankar.re...@gmail.com>
Subject Re: HFileLink backreferences
Date Wed, 23 Jul 2014 19:44:28 GMT

This was the same issue, we were seeing when we wanted to use this. And
also this was also difficult when we wanted to use this for HBase - Hive
integration over snapshot (see HBASE-11484). I think what Matteo Bertozzi
in the the jira HBASE-11484 can be a nice solution for this, where we
provide a way to run the MR without restoring the snapshot

On Wed, Jul 23, 2014 at 11:56 AM, Nick Dimiduk <ndimiduk@gmail.com> wrote:

> Heya,
> I see that we maintain backreferences for hfilelinks. This appears to be
> used by HFileLinkCleaner to determine when an HFile has no HFileLinks and
> thus whether it can be deleted without orphaning those links.
> This is problematic for using the mapreduce over snapshot files feature.
> However, restoring a snapshot can create HFileLinks to existing files in
> the restore directory. Those links then create back-references to the root
> path. Thus we have a situation where the user running the MR job requires
> write access to the hbase root path.
> Was this already discussed in the original ticket (HBASE-8369)? We mention
> the requirement of read permissions (and bypassing security) in the release
> note, but I didn't note any comments for write. Requiring write permission
> effectively means you can only MR as the hbase user, which is pretty much a
> non-starter for any interesting integration of feature.
> Thoughts?
> Thanks,
> Nick

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