+1 On Fri, Jun 16, 2017 at 1:41 PM, Bill Graham <billgra...@gmail.com> wrote:
> Hi, > > Based on the discussion on the incubator mailing list[1] I would like to > call a vote to add Heron to the Apache Incubator. > > The full proposal is available below, and is also available on the Apache > Incubator wiki at: > https://wiki.apache.org/incubator/HeronProposal > > Please vote: > [ ] +1, bring Heron into Incubator > [ ] -1, do not bring Heron into Incubator, because... > > The vote will open for 7 days until Friday June 23 at 14:00 PT. > > Thank you > > 1 - > https://lists.apache.org/thread.html/fb91f527ef479bb5df45bf2c9d93b7 > 786c3fa6cdbfeba3128599df79@%3Cgeneral.incubator.apache.org%3E > > > > = Heron Proposal = > > = Abstract = > Heron is a real-time, distributed, fault-tolerant stream processing engine > initially developed by Twitter. > > = Proposal = > > Heron is a real-time stream processing engine built for high performance, > ease of manageability, performance predictability and developer > productivity[1]. We wish to develop a community around Heron to increase > contributions and see Heron thrive in an open forum. > > = Background = > > Heron provides the ability for developers to compose directed acyclic > graphs (DAGs) of real-time query execution logic (i.e. a topology) and > submit the topology to execute on a pluggable job scheduling system (e.g., > Apache Aurora, YARN, Marathon, etc). Users can employ either the native > Heron API or the Apache Storm API to develop the topology. Heron supports > the Storm API for ease of migration, but beyond that Heron’s architecture > differs considerably from Storm’s. > > Users submit a topology to the scheduler using the Heron client, which uses > the Heron binary libraries to deploy all daemons required to run and manage > the topology. The topology therefore has no reliance on centrally managed > Heron services, only on a generic job scheduling system, which lends itself > well to be run on top of Apache Aurora/Mesos or Apache Hadoop/YARN (among > others). > > The scheduler runs each topology as a job consisting of multiple > containers. One of the containers runs the topology master, responsible for > managing the topology. The remaining containers each runs a stream manager > responsible for data routing, a metrics manager that collects and reports > various metrics and a number of processes called Heron instances which run > the user-defined logic on the stream of tuples. Parallelism is achieved via > process-based isolation of Heron instances, which provides predictable > performance while simplifying debugging. The containers are allocated and > managed by the scheduler framework based on resource availability of nodes > in the cluster. The metadata for the topology, such as the physical plan > and execution details, are stored in the pluggable Heron State Manager > (e.g. Apache ZooKeeper). > > = Rationale = > > Heron is a general-purpose, modular and extensible platform that can be > leveraged to support common, real-time analytics use cases. There is an > increasing demand for open-source, scalable real-time analytics systems. We > believe that Heron can be leveraged by other organizations to build > streaming applications that can benefit from its robustness, high > performance, adaptability to cloud environments and ease of use. Moreover, > we hope that open-sourcing Heron will help to further evolve the technology > as the project attracts contributors with diverse backgrounds and areas of > expertise. > > We believe the Apache foundation is a great fit as the long-term home for > Heron, as it provides an established process for community-driven > development and decision making by consensus. This is exactly the model we > want for future Heron development. > > = Initial Goals = > > * Move the existing codebase, website, documentation, and mailing lists to > Apache-hosted infrastructure. > * Integrate with the Apache development process. > * Ensure all dependencies are compliant with Apache License version 2.0. > * Incrementally develop and release per Apache guidelines. > > = Current Status = > > Heron is a stable project used in production at Twitter since 2014 and open > sourced under the ASL v2 license in 2016. The Heron source code is > currently hosted at github.com (https://github.com/twitter/heron), which > will seed the Apache git repository. > > = Meritocracy = > > By submitting this incubator proposal, we’re expressing our intent to build > a diverse developer community around Heron that will conduct itself > according to The Apache Way and use a meritocratic means of building it's > committer base. Several companies and universities have already expressed > interest in and contributed to Heron. Our goal is to grow the Heron > community by encouraging open communication, contribution and participation > of all types, and ensuring that contributors are recognized appropriately. > > = Community = > > Heron is currently being used by Twitter, Google, Machine Zone and > ndustrial.io and has received significant contributions by Microsoft and > Streamlio. By bringing Heron into the Apache ecosystem, we believe we can > attract even more developers who are interested in creating real-time > systems to build the project's contributor base. > > == Core Developers == > > Current core developers are engineers from Twitter, Google, Microsoft and > Streamlio. > > == Alignment == > > Heron utilizes a number of Apache technologies. Heron leverages Apache > ZooKeeper for coordination and has scheduler implementations to integrate > with Apache Mesos, Apache Aurora and Apache Hadoop's YARN (via Apache REEF) > as well as spout implementations to integrate with Apache Kafka and metrics > implementations to integrate with Scribe. Heron also implements the Apache > Storm user-level API, which allows topologies written against Storm to run > in Heron. We believe that having Heron at Apache will help further the > growth of the streaming compute community, as well as encourage cooperation > and developer cross pollination with other Apache projects. > > = Known Risks = > > == Orphaned Products == > > The risk of the Heron project being abandoned is minimal. It is used in > production at Twitter and Google and other companies are evaluating or > adopting it for production use. > > == Inexperience with Open Source == > > All of the core contributors to the project have considerable experience > with open source software development. Bill Graham[2], Ashvin Agrawal[3] > and Supun Kamburugamuve[4], committers on the project, are PMCs on other > Apache projects and Bill and Ashvin have gone through the Apache incubator > process. Twitter has already donated numerous projects to the ASF (e.g., > Apache Mesos, Apache Aurora, Apache Parquet). We also plan to be mentored > by experienced ASF members that can help with any roadblocks. > > == Homogenous Developers == > > Initial committers come from 5 separate organizations. Our intention is > increase the diversity of contributing developers and their affiliations. > To date github contributions have come from approximately 50 contributors > from outside the Twitter team. > > == Reliance on Salaried Developers == > > It is expected that Heron development will occur on both salaried time and > on volunteer time. The majority of initial committers are paid by their > employers to contribute to this project. We are committed to recruiting > additional committers from other organizations as well as non-salaried > committers to join project. > > == Relationships with Other Apache Products == > > As mentioned in the Alignment section, Heron implements the Apache Storm > API and integrates with multiple Apache schedulers (Apache Mesos, Apache > Aurora and Apache Hadoop's YARN) as well as Apache ZooKeeper and Apache > Thrift. > > == An Excessive Fascination with the Apache Brand == > > Heron's popularity is growing in the streaming compute space and we are > long time supporters of the Apache brand. This proposal is not for the > purpose of generating publicity through. Rather, the primary benefits to > joining Apache are those of community building and open decision making > outlined in the Rationale section. > > == Documentation == > > This proposal exists online as > http://wiki.apache.org/incubator/HeronProposal. Extensive documentation > can > be found on github at https://twitter.github.io/heron and the source code > is well documented. > > == Source and Intellectual Property Submission Plan == > > The Heron codebase is currently hosted on Github: > https://github.com/twitter/heron. During incubation, the codebase will be > migrated to Apache infrastructure. The source code is already ASF 2.0 > licensed. > > == External Dependencies == > > All external libraries have ASF 2.0 compatible licenses except for pylint. > The pylint library is GPL licensed, but is only used for pre-build Python > style checks and is neither bundled with, nor relied upon by, the Heron > source or binary release artifacts. > > == Cryptography == > > Heron does not use any cryptography libraries. > > = Required Resources = > > == Mailing lists == > > * priv...@heron.incubator.apache.org (with moderated subscriptions) > * d...@heron.incubator.apache.org > * comm...@heron.incubator.apache.org > * u...@heron.incubator.apache.org > > == Subversion Directory == > > Git is the preferred source control system: git://git.apache.org/heron > > == Issue Tracking == > > JIRA: Heron (HERON) > > == Initial Committers == > > * Andrew Jorgensen (andrew at andrewjorgensen dot com) > * Ashvin Agrawal (ashvin at apache dot org)* > * Avrilia Floratou (avrilia dot floratou at gmail dot com) > * Bill Graham (billgraham at apache dot org)* > * Brian Hatfield (bmhatfield at gmail dot com) > * Chris Kellogg (cckellogg at gmail dot com) > * Huijun Wu (huijun dot wu dot 2010 at gmail dot com) > * Karthik Ramasamy (karthik at gmail dot com) > * Maosong Fu (maosongfu at gmail dot com) > * Neng Lu(freeneng at gmail dot com) > * Runhang Li (obj dot runhang at gmail dot com) > * Sanjeev Kulkarni (sanjeevrk at gmail dot com) > * Supun Kamburugamuve (supun at apache dot org)* > * Thomas Sun (tom dot ssf at gmail dot com) > * Yaliang Wang (yaliang dot w dot wang at ieee dot org) > > == Affiliations == > > * Andrew Jorgensen (Google) > * Ashvin Agrawal (Microsoft) > * Avrilia Floratou (Microsoft) > * Bill Graham (Twitter) > * Brian Hatfield (Google) > * Chris Kellogg (Twitter) > * Huijun Wu (Twitter) > * Karthik Ramasamy (Streamlio) > * Maosong Fu (Twitter) > * Neng Lu (Twitter) > * Runhang Li (Twitter) > * Sanjeev Kulkarni (Streamlio) > * Supun Kamburugamuve (Indiana University) > * Thomas Sun (Twitter) > * Yaliang Wang (Twitter) > > = Sponsors = > > == Champion == > > * Julien Le Dem (julien at apache dot org) > > == Nominated Mentors == > > * Jake Farrell (jfarrell at apache dot org) > * Jacques Nadeau (jacques at apache dot org) > * Julien Le Dem (julien at apache dot org) > * P. Taylor Goetz (ptgoetz at apache dot org) > > == Sponsoring Entity == > > The Apache Incubator > > == Footnotes == > > * 1 - Papers detailing Heron are available at > http://dl.acm.org/citation.cfm?id=2742788 and > http://sites.computer.org/debull/A15dec/p15.pdf. > * 2 - http://home.apache.org/phonebook.html?uid=billgraham > * 3 - http://home.apache.org/phonebook.html?uid=ashvin > * 4 - http://home.apache.org/phonebook.html?uid=supun >
