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From Robert Metzger <rmetz...@apache.org>
Subject Re: [PROPOSAL] Structure the Flink Open Source Development
Date Tue, 31 May 2016 19:23:38 GMT
Good point. I haven't thought about this name clash.
However, I wonder whether it is clear from the context whether we are
talking about pull request and component shepherding.

Are there any other ideas for the name? If nobody else has concerns
regarding the "maintainer" name, we can of course keep it.

On Tue, May 31, 2016 at 7:57 PM, Chesnay Schepler <chesnay@apache.org>
wrote:

> so are we discarding the other "shepherd" role then?
>
>
> On 31.05.2016 19:47, Robert Metzger wrote:
>
>> Hi,
>>
>> to keep this discussion going, I pasted Stephan's Component proposal into
>> the Wiki:
>> https://cwiki.apache.org/confluence/display/FLINK/Components+and+Shepherds
>>
>> Also, I suggest to rename the "maintainer" to "shepherd" to reflect that
>> still the committers and the PMC is in charge and the shepherd is only
>> keeping a closer eye on some of the compontents (basically reflecting the
>> structure we have already in the community a bit more officially)
>>
>> Lets discuss the proposed shepherds for the components based on Stephan's
>> proposals.
>>
>> Please edit in the wiki or write here if you want to add or remove
>> yourself
>> for a component.
>> If somebody, who has been proposed as a shepherd didn't react until end of
>> this week, I'll remove them (for now. I just want to ensure that we don't
>> make somebody a shepherd who isn't aware).
>>
>> Regards,
>> Robert
>>
>>
>> On Tue, May 17, 2016 at 2:10 PM, Stephan Ewen <sewen@apache.org> wrote:
>>
>> Hi!
>>>
>>> Thanks for all the comments, and the positive resonance! Looks like so
>>> far
>>> all are in favor.
>>>
>>> I would next add a section to the Wiki and the "How to Contribute" Guide
>>> on
>>> this structure, incorporating the component split of Optimizer and
>>> Client.
>>>
>>> After that, let's get started with gathering candidates for the
>>> maintainer
>>> roles. The ones suggested in the mail would be a starting point.
>>>
>>> Greetings,
>>> Stephan
>>>
>>>
>>> On Mon, May 16, 2016 at 11:48 AM, Kostas Tzoumas <ktzoumas@apache.org>
>>> wrote:
>>>
>>> +1 to Henry's comment, once this makes it to the wiki/website the wording
>>>> needs to make it clear that the governance model is unchanged
>>>>
>>>> On Mon, May 16, 2016 at 10:02 AM, Theodore Vasiloudis <
>>>> theodoros.vasiloudis@gmail.com> wrote:
>>>>
>>>> I like the idea of having maintainers as well, hopefully we can
>>>>>
>>>> streamline
>>>>
>>>>> the reviewing process.
>>>>>
>>>>> I of course can volunteer for the FlinkML component.
>>>>> As I've mentioned before I'd love to get one more committer willing to
>>>>> review PRs in FlinkML; by my last count we were up to ~20 open
>>>>>
>>>> ML-related
>>>
>>>> PRs.
>>>>>
>>>>> Regards,
>>>>> Theodore
>>>>>
>>>>> On Mon, May 16, 2016 at 2:17 AM, Henry Saputra <
>>>>>
>>>> henry.saputra@gmail.com>
>>>
>>>> wrote:
>>>>>
>>>>> The maintainers concept is good idea to make sure PRs are moved
>>>>>>
>>>>> smoothly.
>>>>
>>>>> But, we need to make sure that this is not additional hierarchy on
>>>>>>
>>>>> top
>>>
>>>> of
>>>>
>>>>> Flink PMCs.
>>>>>> This will keep us in spirit of ASF community over code.
>>>>>>
>>>>>> Please do add me as cluster management maintainer member.
>>>>>>
>>>>>> - Henry
>>>>>>
>>>>>> On Tuesday, May 10, 2016, Stephan Ewen <sewen@apache.org> wrote:
>>>>>>
>>>>>> Hi everyone!
>>>>>>>
>>>>>>> We propose to establish some lightweight structures in the Flink
>>>>>>>
>>>>>> open
>>>
>>>> source community and development process,
>>>>>>> to help us better handle the increased interest in Flink (mailing
>>>>>>>
>>>>>> list
>>>>
>>>>> and
>>>>>>
>>>>>>> pull requests), while not overwhelming the
>>>>>>> committers, and giving users and contributors a good experience.
>>>>>>>
>>>>>>> This proposal is triggered by the observation that we are reaching
>>>>>>>
>>>>>> the
>>>>
>>>>> limits of where the current community can support
>>>>>>> users and guide new contributors. The below proposal is based
on
>>>>>>> observations and ideas from Till, Robert, and me.
>>>>>>>
>>>>>>> ========
>>>>>>> Goals
>>>>>>> ========
>>>>>>>
>>>>>>> We try to achieve the following
>>>>>>>
>>>>>>>    - Pull requests get handled in a timely fashion
>>>>>>>    - New contributors are better integrated into the community
>>>>>>>    - The community feels empowered on the mailing list.
>>>>>>>      But questions that need the attention of someone that has
deep
>>>>>>> knowledge of a certain part of Flink get their attention.
>>>>>>>    - At the same time, the committers that are knowledgeable
about
>>>>>>>
>>>>>> many
>>>>
>>>>> core
>>>>>>
>>>>>>> parts do not get completely overwhelmed.
>>>>>>>    - We don't overlook threads that report critical issues.
>>>>>>>    - We always have a pretty good overview of what the status
of
>>>>>>>
>>>>>> certain
>>>>
>>>>> parts of the system are.
>>>>>>>        -> What are often encountered known issues
>>>>>>>        -> What are the most frequently requested features
>>>>>>>
>>>>>>>
>>>>>>> ========
>>>>>>> Problems
>>>>>>> ========
>>>>>>>
>>>>>>> Looking into the process, there are two big issues:
>>>>>>>
>>>>>>> (1) Up to now, we have been relying on the fact that everything
>>>>>>>
>>>>>> just
>>>
>>>> "organizes itself", driven by best effort. That assumes
>>>>>>> that everyone feels equally responsible for every part, question,
>>>>>>>
>>>>>> and
>>>
>>>> contribution. At the current state, this is impossible
>>>>>>> to maintain, it overwhelms the committers and contributors.
>>>>>>>
>>>>>>> Example: Pull requests are picked up by whoever wants to pick
them
>>>>>>>
>>>>>> up.
>>>>
>>>>> Pull
>>>>>>
>>>>>>> requests that are a lot of work, have little
>>>>>>> chance of getting in, or relate to less active components are
>>>>>>>
>>>>>> sometimes
>>>>
>>>>> not
>>>>>>
>>>>>>> picked up. When contributors are pretty
>>>>>>> loaded already, it may happen that no one eventually feels
>>>>>>>
>>>>>> responsible
>>>>
>>>>> to
>>>>>
>>>>>> pick up a pull request, and it falls through the cracks.
>>>>>>>
>>>>>>> (2) There is no good overview of what are known shortcomings,
>>>>>>>
>>>>>> efforts,
>>>>
>>>>> and
>>>>>>
>>>>>>> requested features for different parts of the system.
>>>>>>> This information exists in various peoples' heads, but is not
>>>>>>>
>>>>>> easily
>>>
>>>> accessible for new people. The Flink JIRA is not well
>>>>>>> maintained, it is not easy to draw insights from that.
>>>>>>>
>>>>>>>
>>>>>>> ===========
>>>>>>> The Proposal
>>>>>>> ===========
>>>>>>>
>>>>>>> Since we are building a parallel system, the natural solution
seems
>>>>>>>
>>>>>> to
>>>>
>>>>> be:
>>>>>>
>>>>>>> partition the workload ;-)
>>>>>>>
>>>>>>> We propose to define a set of components for Flink. Each component
>>>>>>>
>>>>>> is
>>>
>>>> maintained or tracked by one or more
>>>>>>> people - let's call them maintainers. It is important to note
that
>>>>>>>
>>>>>> we
>>>
>>>> don't
>>>>>>
>>>>>>> suggest the maintainers as an authoritative role, but
>>>>>>> simply as committers or contributors that visibly step up for
a
>>>>>>>
>>>>>> certain
>>>>
>>>>> component, and mainly track and drive the efforts
>>>>>>> pertaining to that component.
>>>>>>>
>>>>>>> It is also important to realize that we do not want to suggest
that
>>>>>>>
>>>>>> people
>>>>>>
>>>>>>> get less involved with certain parts and components, because
>>>>>>> they are not the maintainers. We simply want to make sure that
each
>>>>>>>
>>>>>> pull
>>>>>
>>>>>> request or question or contribution has in the end
>>>>>>> one person (or a small set of people) responsible for catching
and
>>>>>>>
>>>>>> tracking
>>>>>>
>>>>>>> it, if it was not worked on by the pro-active
>>>>>>> community.
>>>>>>>
>>>>>>> For some components, having multiple maintainers will be helpful.
>>>>>>>
>>>>>> In
>>>
>>>> that
>>>>>
>>>>>> case, one maintainer should be the "chair" or "lead"
>>>>>>> and make sure that no issue of that component gets lost between
the
>>>>>>> multiple maintainers.
>>>>>>>
>>>>>>>
>>>>>>> A maintainers' role is:
>>>>>>> -----------------------------
>>>>>>>
>>>>>>>    - Have an overview of which of the open pull requests relate
to
>>>>>>>
>>>>>> their
>>>>
>>>>> component
>>>>>>>    - Drive the pull requests relating to the component to resolution
>>>>>>>        => Moderate the decision whether the feature should
be merged
>>>>>>>        => Make sure the pull request gets a shepherd.
>>>>>>>             In many cases, the maintainers would shepherd
>>>>>>>
>>>>>> themselves.
>>>
>>>>        => In case the shepherd becomes inactive, the maintainers
>>>>>>>
>>>>>> need
>>>
>>>> to
>>>>
>>>>> find a new shepherd.
>>>>>>>
>>>>>>>    - Have an overview of what are the known issues of their
>>>>>>>
>>>>>> component
>>>
>>>>    - Have an overview of what are the frequently requested features
>>>>>>>
>>>>>> of
>>>
>>>> their
>>>>>>
>>>>>>> component
>>>>>>>
>>>>>>>    - Have an overview of which contributors are doing very good
work
>>>>>>>
>>>>>> in
>>>>
>>>>> their component,
>>>>>>>      would be candidates for committers, and should be mentored
>>>>>>>
>>>>>> towards
>>>>
>>>>> that.
>>>>>>>
>>>>>>>    - Resolve email threads that have been brought to their
>>>>>>>
>>>>>> attention,
>>>
>>>> because deeper
>>>>>>>      component knowledge is required for that thread.
>>>>>>>
>>>>>>> A maintainers' role is NOT:
>>>>>>> ----------------------------------
>>>>>>>
>>>>>>>    - Review all pull requests of that component
>>>>>>>    - Answer every mail with questions about that component
>>>>>>>    - Fix all bugs and implement all features of that components
>>>>>>>
>>>>>>>
>>>>>>> We imagine the following way that the community and the maintainers
>>>>>>> interact:
>>>>>>>
>>>>>>>
>>>>>>>
>>> ---------------------------------------------------------------------------------------------------------
>>>
>>>>    - Pull requests should be tagged by component. Since we cannot
>>>>>>>
>>>>>> add
>>>
>>>> labels
>>>>>>
>>>>>>> at this point, we need
>>>>>>>      to rely on the following:
>>>>>>>       => The pull request opener should name the pull request
like
>>>>>>> "[FLINK-XXX] [component] Title"
>>>>>>>       => Components can be (re) tagged by adding special comments
in
>>>>>>>
>>>>>> the
>>>>
>>>>> pull request ("==> component client")
>>>>>>>       => With some luck, GitHub and Apache Infra will allow
us to
>>>>>>>
>>>>>> use
>>>
>>>> labels
>>>>>>
>>>>>>> at some point
>>>>>>>
>>>>>>>    - When pull requests are associated with a component, the
>>>>>>>
>>>>>> maintainers
>>>>
>>>>> will manage them
>>>>>>>      (decision whether to add, find shepherd, catch dropped pull
>>>>>>>
>>>>>> requests)
>>>>>
>>>>>>    - We assume that maintainers frequently reach out to other
>>>>>>>
>>>>>> community
>>>>
>>>>> members and ask them if they want
>>>>>>>      to shepherd a pull request.
>>>>>>>
>>>>>>>    - On the mailing list, everyone should feel equally empowered
to
>>>>>>>
>>>>>> answer
>>>>>
>>>>>> and discuss.
>>>>>>>      If at some point in the discussion, some deep technical
>>>>>>>
>>>>>> knowledge
>>>
>>>> about
>>>>>>
>>>>>>> a component is required,
>>>>>>>      the maintainer(s) should be drawn into the discussion.
>>>>>>>      Because the Mailing List infrastructure has no support to
tag
>>>>>>>
>>>>>> threads,
>>>>>>
>>>>>>> here are some simple workarounds:
>>>>>>>
>>>>>>>      => One possibility is to put the maintainers' mail addresses
on
>>>>>>>
>>>>>> cc
>>>>
>>>>> for
>>>>>>
>>>>>>> the thread, so they get the mail
>>>>>>>            not just via l the mailing list
>>>>>>>      => Another way would be to post something like "+maintainer
>>>>>>>
>>>>>> runtime"
>>>>>
>>>>>> in
>>>>>>
>>>>>>> the thread and the "runtime"
>>>>>>>           maintainers would have a filter/alert on these keywords
in
>>>>>>>
>>>>>> their
>>>>>
>>>>>> mail program.
>>>>>>>
>>>>>>>    - We assume that maintainers will reach out to community members
>>>>>>>
>>>>>> that
>>>>
>>>>> are
>>>>>>
>>>>>>> very active and helpful in
>>>>>>>      a component, and will ask them if they want to be added
as
>>>>>>>
>>>>>> maintainers.
>>>>>>
>>>>>>>      That will make it visible that those people are experts
for
>>>>>>>
>>>>>> that
>>>
>>>> part
>>>>>
>>>>>> of Flink.
>>>>>>>
>>>>>>>
>>>>>>> ======================================
>>>>>>> Maintainers: Committers and Contributors
>>>>>>> ======================================
>>>>>>>
>>>>>>> It helps if maintainers are committers (since we want them to
>>>>>>>
>>>>>> resolve
>>>
>>>> pull
>>>>>>
>>>>>>> requests which often involves
>>>>>>> merging them).
>>>>>>>
>>>>>>> Components with multiple maintainers can easily have non-committer
>>>>>>> contributors in addition to committer
>>>>>>> contributors.
>>>>>>>
>>>>>>>
>>>>>>> ======
>>>>>>> JIRA
>>>>>>> ======
>>>>>>>
>>>>>>> Ideally, JIRA can be used to get an overview of what are the
known
>>>>>>>
>>>>>> issues
>>>>>
>>>>>> of each component, and what are
>>>>>>> common feature requests. Unfortunately, the Flink JIRA is quite
>>>>>>>
>>>>>> unorganized
>>>>>>
>>>>>>> right now.
>>>>>>>
>>>>>>> A natural followup effort of this proposal would be to define
in
>>>>>>>
>>>>>> JIRA
>>>
>>>> the
>>>>>
>>>>>> same components as we defined here,
>>>>>>> and have the maintainers keep JIRA meaningful for that particular
>>>>>>> component. That would allow us to
>>>>>>> easily generate some tables out of JIRA (like top known issues
per
>>>>>>> component, most requested features)
>>>>>>> post them on the dev list once in a while as a "state of the
union"
>>>>>>>
>>>>>> report.
>>>>>>
>>>>>>> Initial assignment of issues to components should be made by
those
>>>>>>>
>>>>>> people
>>>>>
>>>>>> opening the issue. The maintainer
>>>>>>> of that tagged component needs to change the tag, if the component
>>>>>>>
>>>>>> was
>>>>
>>>>> classified incorrectly.
>>>>>>>
>>>>>>>
>>>>>>> ======================================
>>>>>>> Initial Components and Maintainers Suggestion
>>>>>>> ======================================
>>>>>>>
>>>>>>> Below is a suggestion of how to define components for Flink.
One
>>>>>>>
>>>>>> goal
>>>
>>>> of
>>>>>
>>>>>> the division was to make it
>>>>>>> obvious for the majority of questions and contributions to which
>>>>>>>
>>>>>> component
>>>>>>
>>>>>>> they would relate. Otherwise,
>>>>>>> if many contributions had fuzzy component associations, we would
>>>>>>>
>>>>>> again
>>>>
>>>>> not
>>>>>>
>>>>>>> solve the issue of having clear
>>>>>>> responsibilities for who would track the progress and resolution.
>>>>>>>
>>>>>>> We also looked at each component and wrote the names of some
people
>>>>>>>
>>>>>> who
>>>>
>>>>> we
>>>>>>
>>>>>>> thought were natural
>>>>>>> experts for the components, and thus natural candidates for
>>>>>>>
>>>>>> maintainers.
>>>>>
>>>>>> **These names are only a starting point for discussion.**
>>>>>>>
>>>>>>> Once agreed upon, the components and names of maintainers should
be
>>>>>>>
>>>>>> kept
>>>>>
>>>>>> in
>>>>>>
>>>>>>> the wiki and updated as
>>>>>>> components change and people step up or down.
>>>>>>>
>>>>>>>
>>>>>>> *DataSet API* (*Fabian, Greg, Gabor*)
>>>>>>>    - Incuding Hadoop compat. parts
>>>>>>>
>>>>>>> *DataStream API* (*Aljoscha, Max, Stephan*)
>>>>>>>
>>>>>>> *Runtime*
>>>>>>>    - Distributed Coordination (JobManager/TaskManager, Akka)
>>>>>>>
>>>>>> (*Till*)
>>>
>>>>    - Local Runtime (Memory Management, State Backends,
>>>>>>>
>>>>>> Tasks/Operators)
>>>>
>>>>> (
>>>>>
>>>>>> *Stephan*)
>>>>>>>    - Network (*Ufuk*)
>>>>>>>
>>>>>>> *Client/Optimizer* (*Fabian*)
>>>>>>>
>>>>>>> *Type system / Type extractor* (Timo)
>>>>>>>
>>>>>>> *Cluster Management* (Yarn, Mesos, Docker, ...) (*Max, Robert*)
>>>>>>>
>>>>>>> *Libraries*
>>>>>>>    - Gelly (*Vasia, Greg*)
>>>>>>>    - ML (*Till, Theo*)
>>>>>>>    - CEP (*Till*)
>>>>>>>    - Python (*Chesnay*)
>>>>>>>
>>>>>>> *Table API & SQL* (*Fabian, Vasia, Timo, Chengxiang*)
>>>>>>>
>>>>>>> *Streaming Connectors* (*Robert*, *Aljoscha*)
>>>>>>>
>>>>>>> *Batch Connectors and Input/Output Formats* (*Chesnay*)
>>>>>>>
>>>>>>> *Storm Compatibility Layer* (*Mathias*)
>>>>>>>
>>>>>>> *Scala shell* (*Till*)
>>>>>>>
>>>>>>> *Startup Shell Scripts* (Ufuk)
>>>>>>>
>>>>>>> *Flink Build System, Maven Files* (*Robert*)
>>>>>>>
>>>>>>> *Documentation* (Ufuk)
>>>>>>>
>>>>>>>
>>>>>>> Please let us know what you think about this proposal.
>>>>>>> Happy discussing!
>>>>>>>
>>>>>>> Greetings,
>>>>>>> Stephan
>>>>>>>
>>>>>>>
>

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