[Gluster-Maintainers] [Gluster-devel] Proposal to change gNFSstatus

Fri Nov 22 05:39:04 UTC 2019

On Fri, 22 Nov 2019, 5:03 Xie Changlong <zgrep at 139.com> wrote:

>
> 在 2019/11/22 5:14, Kaleb Keithley 写道:
>
> I personally wouldn't call three years ago — when we started to deprecate
> it, in glusterfs-3.9 — a recent change.
>
> As a community the decision was made to move to NFS-Ganesha as the
> preferred NFS solution, but it was agreed to keep the old code in the tree
> for those who wanted it. There have been plans to drop it from the
> community packages for most of those three years, but we didn't follow
> through across the board until fairly recently. Perhaps the most telling
> piece of data is that it's been gone from the packages in the CentOS
> Storage SIG in glusterfs-4.0, -4.1, -5, -6, and -7 with no complaints ever,
> that I can recall.
>
> Ganesha is a preferable solution because it supports NFSv4, NFSv4.1,
> NFSv4.2, and pNFS, in addition to legacy NFSv3. More importantly, it is
> actively developed, maintained, and supported, both in the community and
> commercially. There are several vendors selling it, or support for it; and
> there are community packages for it for all the same distributions that
> Gluster packages are available for.
>
> Out in the world, the default these days is NFSv4. Specifically v4.2 or
> v4.1 depending on how recent your linux kernel is. In the linux kernel,
> client mounts start negotiating for v4.2 and work down to v4.1, v4.0, and
> only as a last resort v3. NFSv3 client support in the linux kernel largely
> exists at this point only because of the large number of legacy servers
> still running that can't do anything higher than v3. The linux NFS
> developers would drop the v3 support in a heartbeat if they could.
>
> IMO, providing it, and calling it maintained, only encourages people to
> keep using a dead end solution. Anyone in favor of bringing back NFSv2,
> SSHv1, or X10R4? No? I didn't think so.
>
> The recent issue[1] where someone built gnfs in glusterfs-7.0 on CentOS7
> strongly suggests to me that gnfs is not actually working well. Three years
> of no maintenance seems to have taken its toll.
>
> Other people are more than welcome to build their own packages from the
> src.rpms and/or tarballs that are available from gluster — and support
> them. It's still in the source and there are no plans to remove it. (Unlike
> most of the other deprecated features which were recently removed in
> glusterfs-7.)
>
>
>
> [1] https://github.com/gluster/glusterfs/issues/764
>
>
> It seems https://bugzilla.redhat.com/show_bug.cgi?id=1727248 has resolved
> this issue.
>
> Here i'll talk about something from commerical company view.  For security
> reasons most government procurement projects only allow universal storage
> protocol(nfs, cifs etc) what means fuse will be excluded.  Consindering
> performance requirements, the only option is nfs.
>

I don't see how NFSv3 is more secure than newer NFS versions.

Nfsv4 is stateful protocol, but i see on performance improvement. Trust me,
> nfs-ganesha(v3, v4) shows  ~30% performance degradation versus gnfs  for
> either small or big files r/w in practice.  Further, many customers prefer
> nfs client than cifs in windows, because the poor cifs performance, AFAIK
> nfs-ganesha is not going well with windows nfs client.
>

Interesting - we've seen far better performance with Ganesha v4.1 vs. gnfs.
Would be great if you could share the details.
Same for NFS Ganesha and Windows support.

It's difficult to counterpart without referring to specific issues. It's
eveb to harder to fix them ;-)

Gnfs is stable enough, we have about ~1000 servers, 4~24 servers for a
> gluster cluster, about ~2000 nfs clients, all works fine till the last two
> years expect some memleak issue.
>

Nice! Would be great for the Gluster community to learn more about the use
case!
Y.

> Thanks
>
>     -Xie
>
> On Thu, Nov 21, 2019 at 5:31 AM Amar Tumballi <amarts at gmail.com> wrote:
>
>> Hi All,
>>
>> As per the discussion on https://review.gluster.org/23645, recently we
>> changed the status of gNFS (gluster's native NFSv3 support) feature to
>> 'Depricated / Orphan' state. (ref:
>> https://github.com/gluster/glusterfs/blob/master/MAINTAINERS#L185..L189).
>> With this email, I am proposing to change the status again to 'Odd Fixes'
>> (ref: https://github.com/gluster/glusterfs/blob/master/MAINTAINERS#L22)
>>
>> TL;DR;
>>
>> I understand the current maintainers are not able to focus on maintaining
>> it as the focus of the project, as earlier described, is keeping
>> NFS-Ganesha based integration with glusterfs. But, I am volunteering along
>> with Xie Changlong (currently working at Chinamobile), to keep the feature
>> running as it used to in previous versions. Hence the status of 'Odd
>> Fixes'.
>>
>> Before sending the patch to make these changes, I am proposing it here
>> now, as gNFS is not even shipped with latest glusterfs-7.0 releases. I have
>> heard from some users that it was working great for them with earlier
>> releases, as all they wanted was NFS v3 support, and not much of features
>> from gNFS. Also note that, even though the packages are not built, none of
>> the regression tests using gNFS are stopped with latest master, so it is
>> working same from at least last 2 years.
>>
>> I request the package maintainers to please add '--with gnfs' (or
>> --enable-gnfs) back to their release script through this email, so those
>> users wanting to use gNFS happily can continue to use it. Also points to
>> users/admins is that, the status is 'Odd Fixes', so don't expect any
>> 'enhancements' on the features provided by gNFS.
>>
>> Happy to hear feedback, if any.
>>
>> Regards,
>> Amar
>>
>> _______________________________________________
>> maintainers mailing list
>> maintainers at gluster.org
>> https://lists.gluster.org/mailman/listinfo/maintainers
>>
>
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