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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5156) CQL: loosen useless versioning constraint
Date Tue, 15 Jan 2013 16:22:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553949#comment-13553949
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Sylvain Lebresne commented on CASSANDRA-5156:
---------------------------------------------

bq. I'm a big fan of utilizing a version number like this to communicate/set expectations
with users

Sure, me too, and I would say that what I'm suggesting is somewhat better at it :).
The only strong expectation the version number will set is that major bumps won't break backward
compatibility. Whether Z is here or not doesn't change that at all.
But if you drop Z, then Y bumps really can only mean "some" change that don't break backward
compatibility and you don't convey anything more.

Now different people have different expectations concerning version numbers, but I'm pretty
sure that for most people 3.0.1 communicate the idea of a minor increment over 3.0.0 and so
probably additions/changes that they can check "when they have time", while 3.1.0 communicate
the idea of more substantial change, something that is probably worth checking out. I think
that this is a useful thing to communicate. When I said "arbitrary", I meant that there's
bound to be some subjectivity in deciding what qualify as an important or a minor addition.
But it's ok, it's still useful information imo.
                
> CQL: loosen useless versioning constraint
> -----------------------------------------
>
>                 Key: CASSANDRA-5156
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5156
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Trivial
>             Fix For: 1.2.1
>
>         Attachments: 5156.txt
>
>
> So far the CQL doc says the CQL language follows http://semver.org/. Meaning that a version
is X.Y.Z where:
> * X is the major version and denotes backward incompatible changes
> * Y is the minor version and denotes backward compatible changes
> * Z is the patch version and denotes backward *and* forward compatible changes, i.e.
change to the implementation.
> Now I don't think for CQL we have much use of the patch version. Not that knowing when
implementation fixes have been done is not useful but:
> # The Cassandra version number already kind of cover that.
> # While a patch version would be more precise in that it would only concern CQL3 related
changes, I have no illusion on our capacity in maintaining such patch version accuratly (and
frankly, I don't blame us).
> So instead of keeping a number that will end up having no usefulness whatsoever, I suggest
that we either:
> # remove it and have CQL3 version being just major and minor.
> # use that latter number as a sub-minor version, i.e. a version that only
> # denotes backward compatible changes, not forward ones. We would then bump the two last
digit at our discretion, to denote some form of "importance" of the changes.
> I don't care much about which of the two we end up doing, but since we already have a
3 numbers version and since I kind of like the idea of having two numbers to convey a sense
of importance of the changes, I'm attaching a patch for the 2nd solution.
> Note that the patch removes the changes section from the doc, but that's because I think
it's useless in it's current form (on top of being inaccurate).  I do plan on adding a new
changes section that lists changes between CQL minor version as soon as we have some of those.

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