[Gluster-users] Proposal to mark few features as Deprecated / SunSet from Version 5.0

Amar Tumballi Suryanarayan atumball at redhat.com
Tue Mar 19 13:12:25 UTC 2019

Hi Jim,

On Tue, Mar 19, 2019 at 6:21 PM Jim Kinney <jim.kinney at gmail.com> wrote:

> Issues with glusterfs fuse mounts cause issues with python file open for
> write. We have to use nfs to avoid this.
> Really want to see better back-end tools to facilitate cleaning up of
> glusterfs failures. If system is going to use hard linked ID, need a
> mapping of id to file to fix things. That option is now on for all exports.
> It should be the default If a host is down and users delete files by the
> thousands, gluster _never_ catches up. Finding path names for ids across
> even a 40TB mount, much less the 200+TB one, is a slow process. A network
> outage of 2 minutes and one system didn't get the call to recursively
> delete several dozen directories each with several thousand files.
Are you talking about some issues in geo-replication module or some other
application using native mount? Happy to take the discussion forward about
these issues.

Are there any bugs open on this?


> nfs
> On March 19, 2019 8:09:01 AM EDT, Hans Henrik Happe <happe at nbi.dk> wrote:
>> Hi,
>> Looking into something else I fell over this proposal. Being a shop that
>> are going into "Leaving GlusterFS" mode, I thought I would give my two
>> cents.
>> While being partially an HPC shop with a few Lustre filesystems,  we
>> chose GlusterFS for an archiving solution (2-3 PB), because we could find
>> files in the underlying ZFS filesystems if GlusterFS went sour.
>> We have used the access to the underlying files plenty, because of the
>> continuous instability of GlusterFS'. Meanwhile, Lustre have been almost
>> effortless to run and mainly for that reason we are planning to move away
>> from GlusterFS.
>> Reading this proposal kind of underlined that "Leaving GluserFS" is the
>> right thing to do. While I never understood why GlusterFS has been in
>> feature crazy mode instead of stabilizing mode, taking away crucial
>> features I don't get. With RoCE, RDMA is getting mainstream. Quotas are
>> very useful, even though the current implementation are not perfect.
>> Tiering also makes so much sense, but, for large files, not on a per-file
>> level.
>> To be honest we only use quotas. We got scared of trying out new
>> performance features that potentially would open up a new back of issues.
>> Sorry for being such a buzzkill. I really wanted it to be different.
>> Cheers,
>> Hans Henrik
>> On 19/07/2018 08.56, Amar Tumballi wrote:
>> * Hi all, Over last 12 years of Gluster, we have developed many features,
>> and continue to support most of it till now. But along the way, we have
>> figured out better methods of doing things. Also we are not actively
>> maintaining some of these features. We are now thinking of cleaning up some
>> of these ‘unsupported’ features, and mark them as ‘SunSet’ (i.e., would be
>> totally taken out of codebase in following releases) in next upcoming
>> release, v5.0. The release notes will provide options for smoothly
>> migrating to the supported configurations. If you are using any of these
>> features, do let us know, so that we can help you with ‘migration’.. Also,
>> we are happy to guide new developers to work on those components which are
>> not actively being maintained by current set of developers. List of
>> features hitting sunset: ‘cluster/stripe’ translator: This translator was
>> developed very early in the evolution of GlusterFS, and addressed one of
>> the very common question of Distributed FS, which is “What happens if one
>> of my file is bigger than the available brick. Say, I have 2 TB hard drive,
>> exported in glusterfs, my file is 3 TB”. While it solved the purpose, it
>> was very hard to handle failure scenarios, and give a real good experience
>> to our users with this feature. Over the time, Gluster solved the problem
>> with it’s ‘Shard’ feature, which solves the problem in much better way, and
>> provides much better solution with existing well supported stack. Hence the
>> proposal for Deprecation. If you are using this feature, then do write to
>> us, as it needs a proper migration from existing volume to a new full
>> supported volume type before you upgrade. ‘storage/bd’ translator: This
>> feature got into the code base 5 years back with this patch
>> <http://review.gluster.org/4809>[1]. Plan was to use a block device
>> directly as a brick, which would help to handle disk-image storage much
>> easily in glusterfs. As the feature is not getting more contribution, and
>> we are not seeing any user traction on this, would like to propose for
>> Deprecation. If you are using the feature, plan to move to a supported
>> gluster volume configuration, and have your setup ‘supported’ before
>> upgrading to your new gluster version. ‘RDMA’ transport support: Gluster
>> started supporting RDMA while ib-verbs was still new, and very high-end
>> infra around that time were using Infiniband. Engineers did work with
>> Mellanox, and got the technology into GlusterFS for better data migration,
>> data copy. While current day kernels support very good speed with IPoIB
>> module itself, and there are no more bandwidth for experts in these area to
>> maintain the feature, we recommend migrating over to TCP (IP based) network
>> for your volume. If you are successfully using RDMA transport, do get in
>> touch with us to prioritize the migration plan for your volume. Plan is to
>> work on this after the release, so by version 6.0, we will have a cleaner
>> transport code, which just needs to support one type. ‘Tiering’ feature
>> Gluster’s tiering feature which was planned to be providing an option to
>> keep your ‘hot’ data in different location than your cold data, so one can
>> get better performance. While we saw some users for the feature, it needs
>> much more attention to be completely bug free. At the time, we are not
>> having any active maintainers for the feature, and hence suggesting to take
>> it out of the ‘supported’ tag. If you are willing to take it up, and
>> maintain it, do let us know, and we are happy to assist you. If you are
>> already using tiering feature, before upgrading, make sure to do gluster
>> volume tier detach all the bricks before upgrading to next release. Also,
>> we recommend you to use features like dmcache on your LVM setup to get best
>> performance from bricks. ‘Quota’ This is a call out for ‘Quota’ feature, to
>> let you all know that it will be ‘no new development’ state. While this
>> feature is ‘actively’ in use by many people, the challenges we have in
>> accounting mechanisms involved, has made it hard to achieve good
>> performance with the feature. Also, the amount of extended attribute
>> get/set operations while using the feature is not very ideal. Hence we
>> recommend our users to move towards setting quota on backend bricks
>> directly (ie, XFS project quota), or to use different volumes for different
>> directories etc. As the feature wouldn’t be deprecated immediately, the
>> feature doesn’t need a migration plan when you upgrade to newer version,
>> but if you are a new user, we wouldn’t recommend setting quota feature. By
>> the release dates, we will be publishing our best alternatives guide for
>> gluster’s current quota feature. Note that if you want to contribute to the
>> feature, we have project quota based issue open
>> <https://github.com/gluster/glusterfs/issues/184>[2] Happy to get
>> contributions, and help in getting a newer approach to Quota.
>> ------------------------------ These are our set of initial features which
>> we propose to take out of ‘fully’ supported features. While we are in the
>> process of making the user/developer experience of the project much better
>> with providing well maintained codebase, we may come up with few more set
>> of features which we may possibly consider to move out of support, and
>> hence keep watching this space. [1] - http://review.gluster.org/4809
>> <http://review.gluster.org/4809> [2] -
>> https://github.com/gluster/glusterfs/issues/184
>> <https://github.com/gluster/glusterfs/issues/184> Regards, Vijay, Shyam,
>> Amar *
>> _______________________________________________
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Amar Tumballi (amarts)
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