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From Matei Zaharia <>
Subject Re: Proposal for Spark Release Strategy
Date Thu, 06 Feb 2014 18:56:24 GMT
I think it’s important to do 1.0 next. The project has been around for 4 years, and I’d
be comfortable maintaining the current codebase for a long time in an API and binary compatible
way through 1.x releases. Over the past 4 years we haven’t actually had major changes to
the user-facing API — the only ones were changing the package to org.apache.spark, and upgrading
the Scala version. I’d be okay leaving 1.x to always use Scala 2.10 for example, or later
cross-building it for Scala 2.11. Updating to 1.0 says two things: it tells users that they
can be confident that version will be maintained for a long time, which we absolutely want
to do, and it lets outsiders see that the project is now fairly mature (for many people, pre-1.0
might still cause them not to try it). I think both are good for the community.

Regarding binary compatibility, I agree that it’s what we should strive for, but it just
seems premature to codify now. Let’s see how it works between, say, 1.0 and 1.1, and then
we can codify it.


On Feb 6, 2014, at 10:43 AM, Henry Saputra <> wrote:

> Thanks Patick to initiate the discussion about next road map for Apache Spark.
> I am +1 for 0.10.0 for next version.
> It will give us as community some time to digest the process and the
> vision and make adjustment accordingly.
> Release a 1.0.0 is a huge milestone and if we do need to break API
> somehow or modify internal behavior dramatically we could take
> advantage to release 1.0.0 as good step to go to.
> - Henry
> On Wed, Feb 5, 2014 at 9:52 PM, Andrew Ash <> wrote:
>> Agree on timeboxed releases as well.
>> Is there a vision for where we want to be as a project before declaring the
>> first 1.0 release?  While we're in the 0.x days per semver we can break
>> backcompat at will (though we try to avoid it where possible), and that
>> luxury goes away with 1.x  I just don't want to release a 1.0 simply
>> because it seems to follow after 0.9 rather than making an intentional
>> decision that we're at the point where we can stand by the current APIs and
>> binary compatibility for the next year or so of the major release.
>> Until that decision is made as a group I'd rather we do an immediate
>> version bump to 0.10.0-SNAPSHOT and then if discussion warrants it later,
>> replace that with 1.0.0-SNAPSHOT.  It's very easy to go from 0.10 to 1.0
>> but not the other way around.
>> Cheers!
>> Andrew
>> On Wed, Feb 5, 2014 at 9:49 PM, Heiko Braun <>wrote:
>>> +1 on time boxed releases and compatibility guidelines
>>>> Am 06.02.2014 um 01:20 schrieb Patrick Wendell <>:
>>>> Hi Everyone,
>>>> In an effort to coordinate development amongst the growing list of
>>>> Spark contributors, I've taken some time to write up a proposal to
>>>> formalize various pieces of the development process. The next release
>>>> of Spark will likely be Spark 1.0.0, so this message is intended in
>>>> part to coordinate the release plan for 1.0.0 and future releases.
>>>> I'll post this on the wiki after discussing it on this thread as
>>>> tentative project guidelines.
>>>> == Spark Release Structure ==
>>>> Starting with Spark 1.0.0, the Spark project will follow the semantic
>>>> versioning guidelines ( with a few deviations.
>>>> These small differences account for Spark's nature as a multi-module
>>>> project.
>>>> Each Spark release will be versioned:
>>>> All releases with the same major version number will have API
>>>> compatibility, defined as [1]. Major version numbers will remain
>>>> stable over long periods of time. For instance, 1.X.Y may last 1 year
>>>> or more.
>>>> Minor releases will typically contain new features and improvements.
>>>> The target frequency for minor releases is every 3-4 months. One
>>>> change we'd like to make is to announce fixed release dates and merge
>>>> windows for each release, to facilitate coordination. Each minor
>>>> release will have a merge window where new patches can be merged, a QA
>>>> window when only fixes can be merged, then a final period where voting
>>>> occurs on release candidates. These windows will be announced
>>>> immediately after the previous minor release to give people plenty of
>>>> time, and over time, we might make the whole release process more
>>>> regular (similar to Ubuntu). At the bottom of this document is an
>>>> example window for the 1.0.0 release.
>>>> Maintenance releases will occur more frequently and depend on specific
>>>> patches introduced (e.g. bug fixes) and their urgency. In general
>>>> these releases are designed to patch bugs. However, higher level
>>>> libraries may introduce small features, such as a new algorithm,
>>>> provided they are entirely additive and isolated from existing code
>>>> paths. Spark core may not introduce any features.
>>>> When new components are added to Spark, they may initially be marked
>>>> as "alpha". Alpha components do not have to abide by the above
>>>> guidelines, however, to the maximum extent possible, they should try
>>>> to. Once they are marked "stable" they have to follow these
>>>> guidelines. At present, GraphX is the only alpha component of Spark.
>>>> [1] API compatibility:
>>>> An API is any public class or interface exposed in Spark that is not
>>>> marked as semi-private or experimental. Release A is API compatible
>>>> with release B if code compiled against release A *compiles cleanly*
>>>> against B. This does not guarantee that a compiled application that is
>>>> linked against version A will link cleanly against version B without
>>>> re-compiling. Link-level compatibility is something we'll try to
>>>> guarantee that as well, and we might make it a requirement in the
>>>> future, but challenges with things like Scala versions have made this
>>>> difficult to guarantee in the past.
>>>> == Merging Pull Requests ==
>>>> To merge pull requests, committers are encouraged to use this tool [2]
>>>> to collapse the request into one commit rather than manually
>>>> performing git merges. It will also format the commit message nicely
>>>> in a way that can be easily parsed later when writing credits.
>>>> Currently it is maintained in a public utility repository, but we'll
>>>> merge it into mainline Spark soon.
>>>> [2]
>>>> == Tentative Release Window for 1.0.0 ==
>>>> Feb 1st - April 1st: General development
>>>> April 1st: Code freeze for new features
>>>> April 15th: RC1
>>>> == Deviations ==
>>>> For now, the proposal is to consider these tentative guidelines. We
>>>> can vote to formalize these as project rules at a later time after
>>>> some experience working with them. Once formalized, any deviation to
>>>> these guidelines will be subject to a lazy majority vote.
>>>> - Patrick

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