[Gluster-devel] [Gluster-Maintainers] Proposal to change the version numbers of Gluster project

[Atin Mukherjee]

On Fri, Mar 16, 2018 at 11:03 AM, Vijay Bellur <vbellur at redhat.com> wrote:

>
>
> On Wed, Mar 14, 2018 at 9:48 PM, Atin Mukherjee <amukherj at redhat.com>
> wrote:
>
>>
>>
>> On Thu, Mar 15, 2018 at 9:45 AM, Vijay Bellur <vbellur at redhat.com> wrote:
>>
>>>
>>>
>>> On Wed, Mar 14, 2018 at 5:40 PM, Shyam Ranganathan <srangana at redhat.com>
>>> wrote:
>>>
>>>> On 03/14/2018 07:04 PM, Joe Julian wrote:
>>>> >
>>>> >
>>>> > On 03/14/2018 02:25 PM, Vijay Bellur wrote:
>>>> >>
>>>> >>
>>>> >> On Tue, Mar 13, 2018 at 4:25 AM, Kaleb S. KEITHLEY
>>>> >> <kkeithle at redhat.com <mailto:kkeithle at redhat.com>> wrote:
>>>> >>
>>>> >>     On 03/12/2018 02:32 PM, Shyam Ranganathan wrote:
>>>> >>     > On 03/12/2018 10:34 AM, Atin Mukherjee wrote:
>>>> >>     >>       *
>>>> >>     >>
>>>> >>     >>         After 4.1, we want to move to either continuous
>>>> >>     numbering (like
>>>> >>     >>         Fedora), or time based (like ubuntu etc) release
>>>> >>     numbers. Which
>>>> >>     >>         is the model we pick is not yet finalized. Happy to
>>>> >>     hear opinions.
>>>> >>     >>
>>>> >>     >>
>>>> >>     >> Not sure how the time based release numbers would make more
>>>> >>     sense than
>>>> >>     >> the one which Fedora follows. But before I comment further on
>>>> >>     this I
>>>> >>     >> need to first get a clarity on how the op-versions will be
>>>> >>     managed. I'm
>>>> >>     >> assuming once we're at GlusterFS 4.1, post that the releases
>>>> >>     will be
>>>> >>     >> numbered as GlusterFS5, GlusterFS6 ... So from that
>>>> >>     perspective, are we
>>>> >>     >> going to stick to our current numbering scheme of op-version
>>>> >>     where for
>>>> >>     >> GlusterFS5 the op-version will be 50000?
>>>> >>     >
>>>> >>     > Say, yes.
>>>> >>     >
>>>> >>     > The question is why tie the op-version to the release number?
>>>> That
>>>> >>     > mental model needs to break IMO.
>>>> >>     >
>>>> >>     > With current options like,
>>>> >>     > https://docs.gluster.org/en/latest/Upgrade-Guide/op_version/
>>>> >>     <https://docs.gluster.org/en/latest/Upgrade-Guide/op_version/>
>>>> it is
>>>> >>     > easier to determine the op-version of the cluster and what it
>>>> >>     should be,
>>>> >>     > and hence this need not be tied to the gluster release version.
>>>> >>     >
>>>> >>     > Thoughts?
>>>> >>
>>>> >>     I'm okay with that, but——
>>>> >>
>>>> >>     Just to play the Devil's Advocate, having an op-version that
>>>> bears
>>>> >>     some
>>>> >>     resemblance to the _version_ number may make it easy/easier to
>>>> >>     determine
>>>> >>     what the op-version ought to be.
>>>> >>
>>>> >>     We aren't going to run out of numbers, so there's no reason to be
>>>> >>     "efficient" here. Let's try to make it easy. (Easy to not make a
>>>> >>     mistake.)
>>>> >>
>>>> >>     My 2¢
>>>> >>
>>>> >>
>>>> >> +1 to the overall release cadence change proposal and what Kaleb
>>>> >> mentions here.
>>>> >>
>>>> >> Tying op-versions to release numbers seems like an easier approach
>>>> >> than others & one to which we are accustomed to. What are the
>>>> benefits
>>>> >> of breaking this model?
>>>> >>
>>>> > There is a bit of confusion among the user base when a release happens
>>>> > but the op-version doesn't have a commensurate bump. People ask why
>>>> they
>>>> > can't set the op-version to match the gluster release version they
>>>> have
>>>> > installed. If it was completely disconnected from the release version,
>>>> > that might be a great enough mental disconnect that the expectation
>>>> > could go away which would actually cause less confusion.
>>>>
>>>> Above is the reason I state it as well (the breaking of the mental model
>>>> around this), why tie it together when it is not totally related. I also
>>>> agree that, the notion is present that it is tied together and hence
>>>> related, but it may serve us better to break it.
>>>>
>>>>
>>>
>>> I see your perspective. Another related reason for not introducing an
>>> op-version bump in a new release would be that there are no incompatible
>>> features introduced (in the new release). Hence it makes sense to preserve
>>> the older op-version.
>>>
>>> To make everyone's lives simpler, would it be useful to introduce a
>>> command that provides the max op-version to release number mapping? The
>>> output of the command could look like:
>>>
>>> op-version X: 3.7.0 to 3.7.11
>>> op-version Y: 3.7.12 to x.y.z
>>>
>>
>> We already have introduced an option called cluster.max-op-version where
>> one can run a command like "gluster v get all cluster.max-op-version" to
>> determine what highest op-version the cluster can be bumped up to. IMO,
>> this helps users not to look at the document for at given x.y.z release the
>> op-version has to be bumped up to XXXXX .  Isn't that sufficient for this
>> requirement?
>>
>
>
> I think it is a more elegant solution than what I described.  Do we have a
> single interface to determine the current & max op-versions of all members
> in the trusted storage pool? If not, it might be an useful enhancement to
> add at some point in time.
>

We do have a way to get to that details:

root at a7f4b3e96fde:/home/glusterfs# gluster v get all all | grep op-version
cluster.op-version
40100
cluster.max-op-version                  40100


> If we don't hear much complaints about op-version mismatches from users, I
> think the CLI you described could be sufficient for understanding the
> cluster operating version.
>
>
> Thanks,
> Vijay
>
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