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From "Tan,Zhongyi" <>
Subject Re: [VOTE] Accept StreamPipes into the Apache Incubator
Date Mon, 11 Nov 2019 00:31:52 GMT

在 2019/11/8 上午3:40,“Christofer Dutz”<> 写入:

    A big +1 (binding) from me
    Von: Julian Feinauer <>
    Gesendet: Donnerstag, 7. November 2019 20:19:43
    An: <>
    Betreff: Re: [VOTE] Accept StreamPipes into the Apache Incubator
    Hi Dominik,
    I like StreamPipes, as you know, thus my vote is
    +1 (binding)
    Am 07.11.19, 20:00 schrieb "Dominik Riemer" <>:
        Hi all,
        following up the [DISCUSS] thread on StreamPipes (,
I would like to call a VOTE to accept StreamPipes into the Apache Incubator.
        Please cast your vote:
          [ ] +1, bring StreamPipes into the Incubator
          [ ] +0, I don't care either way
          [ ] -1, do not bring StreamPipes into the Incubator, because...
        The vote will open at least for 72 hours and only votes from the Incubator PMC are
binding, but votes from everyone are welcome.
        StreamPipes Proposal (
        == Abstract ==
        StreamPipes is a self-service (Industrial) IoT toolbox to enable non-technical users
to connect, analyze and explore (Industrial) IoT data streams.
        = Proposal =
        The goal of StreamPipes (<>) is
to provide an easy-to-use toolbox for non-technical users, e.g., domain experts, to exploit
data streams coming from (Industrial) IoT devices. Such users are provided with an intuitive
graphical user interface with the Pipeline Editor at its core. Users are able to graphically
model processing pipelines based on data sources (streams), data processors and data sinks.
Data processors and sinks are self-contained microservices, which implement either stateful
or stateless processing logic (e.g., a trend detection or image classifier). Their processing
logic is implemented using one of several provided wrappers (we currently have wrappers for
standalone/Edge-based processing, Apache Flink, Siddhi and working wrapper prototypes for
Apache Kafka Streams and Spark, in the future we also plan to integrate with Apache Beam).
An SDK allows to easily create new pipeline elements. Pipeline elements can be installed at
runtime. To support users in creating pipelines, an underlying semantics-based data model
enables pipeline elements to express requirements on incoming data streams that need to be
fulfilled, thus reducing modeling errors.
        Data streams are integrated by using StreamPipes Connect, which allows to connect
data sources (based on standard protocols, such as MQTT, Kafka, Pulsar, OPC-UA and further
PLC4X-supported protocols) without further programming using a graphical wizard. Additional
user-faced modules of StreamPipes are a Live dashboard to quickly explore IoT data streams
and a wizard that generates code templates for new pipeline elements, a Pipeline Element Installer
used to extend the algorithm feature set at runtime.
        === Background ===
        StreamPipes was started in 2014 by researchers from FZI Research Center for Information
Technology in Karlsruhe, Germany. The original prototype was funded by an EU project centered
around predictive analytics for the manufacturing domain. Since then, StreamPipes was constantly
improved and extended by public funding mainly from federal German ministries. In early 2018,
the source code was officially released under the Apache License 2.0. At the same time, while
we focused on bringing the research prototype to a production-grade tool, the first companies
started to use StreamPipes. Currently, the primary goal is to widen the user and developer
base. At ApacheCon NA 2019, after having talked to many people from the Apache Community,
we finally decided that we would like to bring StreamPipes to the Apache Incubator.
        === Rationale ===
        The (Industrial) IoT domain is a highly relevant and emerging sector. Currently, IoT
platforms are offered by many vendors ranging from SMEs up to large enterprises. We believe
that open source alternatives are an important cornerstone for manufacturing companies to
easily adopt data-driven decision making. From our point of view, StreamPipes fits very well
into the existing (I)IoT ecosystem within the ASF, with projects such as Apache PLC4X focusing
on connecting machine data from PLCs, or other tools we are also using either in the core
of StreamPipes or with integrations (Apache Kafka, Apache IoTDB, Apache Pulsar). StreamPipes
itself focuses on enabling self-service IoT data analytics for non-technical users.
        The whole StreamPipes code is currently on Github. To get a rough estimate of the
project size:
        * streampipes: Backend and core modules, ~3300 commits
        * streampipes-ui: User Interface, ~1300 commits
        * streampipes-pipeline-elements: ~100 Pipeline Elements (data processors/algorithms
and sinks), ~500 Commits
        * streampipes-connect-adapters: ~20 Adapters to connect data, ~100 commits To achieve
our goal to further extend the code base with new features, new connectors and new algorithms
and to grow both the user and developer community, we believe that a community-driven development
process is the best way to further develop StreamPipes. Finally, after having talked to committers
from various Apache IoT-related projects and participation in spontaneous hacking sessions
and being impressed by the collaboration among individual projects, we decided that (from
our point of view) the ASF is the ideal place to be the future home of StreamPipes.
        === Initial Goals ===
        * Move the existing codebase to Apache
        * Fully align with Apache development- and release processes
        * Perform name search and do a thorough review of existing licenses
        * First Apache release
        === Current Status ===
        ** Meritocracy **
        We are absolutely committed to strengthen StreamPipes as a real community-driven open
source project. The existing committer base is highly motivated to foster the open source
way in the industrial IoT sector and, together with existing Apache communities focused on
this domain, provide open source tooling for Industrial IoT projects in the same way Apache
offers in the Big Data space, for instance.
        The development philosophy behind StreamPipes has always followed the principles of
meritocracy - although most committers are still active in the project, we managed to onboard
new, committed developers regularly. 2 people, who are today core of the developer team, have
joined during the past year. Therefore, we would aim to continuously expand the PMC and committer
base based on merit.
        ** Community **
        Since being open-sourced in 2018, the public interest in StreamPipes has steadily
grown. Several companies, mainly from the manufacturing domain, have tested StreamPipes in
form of proof-of-concept projects. First companies have started to use StreamPipes in production.
This was due to a high number of events from meetups, research conferences, demo sessions
up to hackathons we participated or organized during the past two years. After having generated
a general interest in StreamPipes, our next focus will be to find more committers to diversify
the contributor base.
        ** Core Developers **
        The core developers of the system are Dominik Riemer, Philipp Zehnder, Patrick Wiener
and Johannes Tex. All core developers are initial committers in the current proposal. Some
former students who recently started to work at companies and who have also worked on the
project with great commitment, will be asked to further contribute to the project.
        ** Alignment **
        StreamPipes has dependencies to a lot of existing Apache projects - this is one reason
why we think that the ASF is the best future home for StreamPipes. The messaging layer is
based on Apache Kafka (and also Apache Pulsar as a future option), and runtime wrappers exist
for Apache Flink, Apache Spark and Apache Kafka Streams. StreamPipes Connect already includes
adapters for several Apache projects. Most importantly, we integrate (and plan to deepen the
integration) with IIoT-focused projects such as Apache PLC4X. Also, several data sinks exist
to send messages to tools from other Apache projects (e.g., Apache Kafka, Apache Pulsar, and
Apache IoTDB). Together with these tools (and also after having talked to the core developers
after this year's ApacheCon) we are absolutely convinced that a tight integration between
these tools will strengthen the open source IoT ecosystem.
        === Known Risks ===
        ** Orphaned Products **
        We don't expect the risk of an orphaned product. The initial committers have worked
on the project for years and are absolutely committed to making this open source tool a great
success. All initial committers are committed to work on StreamPipes in their free time.
        ** Inexperience with Open Source **
        All initial committers have years of expertise related to open source development
and understand what open source means. However, none of the initial committers are currently
committers to Apache projects, although some have already contributed to some projects. From
a variety of events and from intensively studying Apache mailing lists, we are sure that the
Apache Way is the way we'd like the project to move into the future. We expect to benefit
from the experiences from the ASF in building successful open source projects.
        ** Length of Incubation **
        We are aware that incubation is a process that is focused on building the community,
learning the Apache Way and other important things such as learning the release process and
handling licensing and trademark issues. We are also aware that, although there is a steadily
increasing interest in StreamPipes, a major challenge we would need (and are willing) to work
on during the incubation phase is widening the committer base. We look forward to that as
a large developer base is exactly what we are striving for.
        ** Homogeneous Developers **
        Most current developers work for the same institution (FZI). The motivation of all
developers goes beyond their commitment to work and all current committers work on StreamPipes
in their free time. Recently, we have received first pull requests from external contributors
and a growing interest from users and companies outside of FZI. First manufacturing companies
have already evaluated and adopted StreamPipes. To attract external developers, we've created
an extensive documentation, have a Slack channel to quickly answer questions, and provide
help via mail. Therefore, we believe that making the developer community more heterogeneous
is not only mandatory, but something that can be achieved during the next months.
        ** Reliance on salaried developers **
        Currently, StreamPipes receives support from salaried developers, mainly research
scientists from FZI. However, all core developers substantially work on StreamPipes in their
spare time. As this has been the case from the beginning in early 2014, it can be expected
that a substantial portion of volunteers will continue to be working on the project and we
aim at strengthening the base of non-paid committers and paid committers of other companies.
At the same time, funding of the initial StreamPipes team is secured by public funding for
the next few years, making sure that there will be also enough commitment from developers
during their work time.
        ** Relationships with other Apache products ** StreamPipes is often compared to tools
such as Node-Red and Apache Nifi. This is mainly based on a similar UI concept (dataflow approach).
Despite some technological differences (e.g., the microservice analytics approach vs. single-host
runtime of Node-Red, the wrapper architecture and the underlying semantics-based model), we
believe the target audience differs. We aim to collaborate with the Apache Nifi community
in terms of exchanging best practices and also integrating both projects (e.g., by building
        As mentioned above, quite a few adapters and data sinks are already available that
link to existing Apache projects.
        ** An excessive fascination with the Apache Brand ** Although we recognize the Apache
brand as the most visible brand in the open source domain, the primary goal of this proposal
is not to create publicity, but to widen the developer base. We believe that successful projects
have broad and diverse communities. We expect that an Apache project, with a clear and proven
way to develop open source software, helps in finding new committers. As the core development
team has already worked on StreamPipes for the past few years and is fully committed to the
software and its benefit for the industrial IoT domain, we would also continue development
without being an Apache project.
        === Documentation ===
        Currently, we host a website at More technical info (user
+ developer guide) can be found in the documentation:, where
users can find tutorials and manuals on how to extend StreamPipes using the SDK.
        === Initial Source ===
        Currently, the following Github repositories exist, all licensed under the Apache
Software License 2.0:
        * streampipes (, the backend & pipeline
management module)
        * streampipes-ui (, the UI module)
        * streampipes-pipeline-elements (,
library of data processors and sinks)
        * streampipes-connect-adapters (,
StreamPipes connect adapters)
        * streampipes-docs (, the abovementioned
        === Source and intellectual property submission plan === All initial committers will
sign a ICLA with the ASF. FZI, as the organizational body that has employed the main contributors
of StreamPipes, will sign a CCLA and donate the codebase to the ASF (both subject to formal
approval). All major contributors are still active in the project.
        === External Dependencies ===
        We did an initial review of all dependencies used in the various projects. No critical
libraries that depend on category X licenses were found, some minor issues have already been
resolved (e.g., removing dependencies to org.json libraries). Most external dependencies used
by the Java-based (backend, pipeline-elements and connect) modules are licensed under the
Apache License 2.0, whereas some licenses are Cat B (e.g., CDDL). Most external dependencies
the UI requires on are licensed under the MIT license.
        Once we are moving to the Incubator, we would do a complete check of all transitive
dependencies. We don't expect any surprises here.
        === Cryptography ===
        (not applicable)
        === Required Resources ===
        ** Mailing Lists **
        We plan to use the following mailing lists:
        As StreamPipes is targeted to a non-technical audience, we see a dedicated user mailing
list as an important requirement to help users.
        ** Subversion directory **
        (not applicable)
        ** Git repositories **
        We would like to use Git for source code management and enable Github mirroring functionality.
        As we plan to merge some of the repos described above to simplify the release process
we ask to create the following source repositories:
        * streampipes (containing backend + UI)
        * streampipes-extensions (containing modules that can be dynamically installed at
runtime: pipeline elements and connect adapters)
        * streampipes-website (containing docs + website)
        ** Issue tracking **
        JIRA ID: StreamPipes
        === Initial Committers ===
        List of initial committers in alphabetical order:
        * Christofer Dutz (christofer.dutz at c-ware dot de)
        * Dominik Riemer (dominik dot riemer at gmail dot com)
        * Johannes Tex (tex at fzi dot de)
        * Patrick Wiener (wiener at fzi dot de)
        * Philipp Zehnder (zehnder at fzi dot de)
        === Sponsors ===
        ** Champion **
        * Christofer Dutz (christofer.dutz at c-ware dot de)
        ** Mentors **
        * Christofer Dutz (christofer.dutz at c-ware dot de)
        * Julian Feinauer (Jfeinauer at apache dot org)
        * Kenneth Knowles (kenn at apache dot org)
        * Justin Mclean (justin at classsoftware dot com)
        * Jean-Baptiste Onofré (jb at nanthrax dot net)
        ** Sponsoring Entity **
        The Apache Incubator
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