[Gluster-Maintainers] [Gluster-devel] RFC: Gluster.Next: Where and how DHT2 work/code would be hosted

[Atin Mukherjee]

First of all my apologies for not going through the meeting blog before
sending my thoughts on how we plan to maintain GlusterD 2.0 [1].

This approach seems fine to me as long as we don't touch any existing
xlators. How do we handle cases where other xlators get impacted by
certain changes. Are we going to copy the whole translator in
xlators/experimental and start working on it?

Instead of all this wouldn't it be simpler to have development under a
separate branch say "4.0-unstable" and we could disable CI on this
branch till it becomes stable? Are we worried about pulling in the
changes from this to master once the branch becomes stable?

This is just my thought and I would like to get a clarity on this.

Thanks,
Atin

[1] http://www.gluster.org/pipermail/gluster-devel/2015-October/046872.html

On 10/08/2015 11:35 PM, Shyam wrote:
> Hi,
> 
> On checking yesterday's gluster meeting AIs and (later) reading the
> minutes, for DHT2 here is what I gather and propose to do for $SUBJECT.
> Feel free to add/negate any plans.
> 
> (This can also be discussed at [2])
> 
> -------------------------------------------------------------------
> 1) Create a directory under the glusterfs master branch as follows,
> ./xlators/*experimental*/dht2
> ./xlators/*experimental*/posix2
> 
> See patch request at [2]
> 
> All code, design documents (work products in general) would go into this
> directory.
> 
> 2) Code that compiles and does not cause CI failures could *potentially*
> be merged with very few DHT2 dev folks assent.
> 
> There would possibly be no CI integration till we get something working,
> so merges would be based on compile passing initially. Soon there would
> be an attempt at getting unit testing integrated, so that code being
> submitted is not abysmally horrendous
> 
> 3) Common framework code changes (if any) would be presented as a
> separate commit request
> 
> 4) (Big problem) DHT2 requires glusterd changes to create a volume as
> DHT2 and not DHT, this would be maintained as a .patch in the dht2
> directory as above. This is so that people can play with DHT2 volumes if
> interested. Integration of this piece either comes with glusterd 2.0 or
> based on time lines of other events, in the current version of glusterd.
> (if you are interested in seeing the current version of this patch, go
> here [1])
> -------------------------------------------------------------------
> 
> If there is some key disagreement on certain points like (2) above, then
> we would need to bring in DHT2 code in parts so that it makes sense.
> This is fine too, just that we would have 2 repos till we reach a point
> of maturity in development.
> 
> -------------------------------------------------------------------
> *Some issues with the approach:*
> A) We need to ensure we do not ship xlators compiled from the
> experimental directory
> 
> B) We need to possibly add a buddy maintainer for experimental
> translator owners, who can help with the process of merging their changes.
> 
> C) I am not sure how this helps the review process, as initially xlator
> development can be iffy and so we do not expect reviews to be stringent.
> Later when we want to move this out of the experimental category, how do
> we review the same now, and what actions do we take to ensure quality?
> Won't we have the same bulk code review issue?
> -------------------------------------------------------------------
> 
> Shameless plug: For quality and if an xlator plays well with other parts
> of gluster the distaf framework of testing against possible graphs and
> access protocols can be of immense help.
> 
> Shyam
> 
> [1]
> https://github.com/ShyamsundarR/glusterfs/commit/663eeb98f6a51384c8745b8882e7c6c4f7b58a7c
> 
> [2] http://review.gluster.org/#/c/12321/1
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