On 02/24/2015 02:54 PM, Prashanth Pai wrote:
Changelog logs GFID. Swift DBs need file path (acc/cont/obj format). Methods[1] to convert GFID to Path are not stable and also expensive. And there's no way to know which files were deleted even if we know GFID[2].
(Answering inline is always a better approach on MLs :))
Thanks, Prashanth. Aravinda and Kotresh are working on a set of changes
that might make both problems easier to address. I suspect that we may
need some variant of [2] to find a generic answer for the 2nd problem.
What aspects of the gfid to path conversion do you deem as unstable? I
assume that support for hardlinks would not be of interest to most swift
deployments?
Regards,
Vijay
[1] https://github.com/gluster/glusterfs/blob/master/doc/debugging/gfid-to-path.md
[2] http://review.gluster.org/8376
Regards,
-Prashanth Pai
----- Original Message -----
From: "Vijay Bellur" <vbellur@xxxxxxxxxx>
To: "Prashanth Pai" <ppai@xxxxxxxxxx>, "Luis Pabon" <lpabon@xxxxxxxxxx>
Cc: "gluster-devel@xxxxxxxxxxx >> Gluster Devel" <gluster-devel@xxxxxxxxxxx>
Sent: Tuesday, February 24, 2015 12:41:07 PM
Subject: Re: Object Quota feature proposal for GlusterFS-3.7
On 02/24/2015 10:54 AM, Prashanth Pai wrote:
Hi Luis,
Currently, even with storage policies, there is no mechanism to update the container DBs with details of files created/modified/deleted over filesystem interface.
Hence a GET on a container would list objects that may or may not exist on disk. Also the metadata of container (bytes and object count) could be outdated.
We need a mechanism to detect change in GlusterFS (have explored changelog and inotify, both not feasible) and then lazily update Swift DBs so that the container listing and metadata would eventually look right.
What were the problems encountered while trying to use changelog?
Thanks,
Vijay
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