+1 (binding) On Nov 7, 2013 1:04 PM, "Andreas Neumann" <a...@apache.org> wrote:
> The discussion about the Weave proposal has calmed. As the outcome of the > discussion, we have chosen a new name for the project, Twill. I would like > to call a vote for Twill to become an incubated project. > > The proposal is pasted below, and also available at: > https://wiki.apache.org/incubator/TwillProposal > > Let's keep this vote open for three business days, closing the voting on > Tuesday 11/12. > > [ ] +1 Accept Twill into the Incubator > [ ] +0 Don't care. > [ ] -1 Don't accept Twill because... > > -Andreas. > > = Abstract = > > Twill is an abstraction over Apache Hadoop® YARN that reduces the > complexity of developing distributed applications, allowing developers to > focus more on their business logic. > > = Proposal = > > Twill is a set of libraries that reduces the complexity of developing > distributed applications. It exposes the distributed capabilities of Apache > Hadoop® YARN via a simple and intuitive programming model similar to Java > threads. Twill also has built-in capabilities required by many distributed > applications, such as real-time application logs and metrics collection, > application lifecycle management, and network service discovery. > > = Background = > > Hadoop YARN is a generic cluster resource manager that supports any type of > distributed application. However, YARN’s interfaces are too low level for > rapid application development. It requires a great deal of boilerplate code > even for a simple application, creating a high ramp up cost that can turn > developers away. > > Twill is designed to improve this situation with a programming model that > makes running distributed applications as easy as running Java threads. > With the abstraction provided by Twill, applications can be executed in > process threads during development and unit testing and then be deployed to > a YARN cluster without any modifications. > > Twill also has built-in support for real-time application logs and metrics > collection, delegation token renewal, application lifecycle management, and > network service discovery. This greatly reduces the pain that developers > face when developing, debugging, deploying and monitoring distributed > applications. > > Twill is not a replacement for YARN, it’s a framework that operates on top > of YARN. > > = Rationale = > > Developers who write YARN applications typically find themselves > implementing the same (or similar) boilerplate code over and over again > for every application. It makes sense to distill this common code into a > reusable set of libraries that is perpetually maintained and improved by a > diverse community of developers. > > Twill’s simple thread-like programming model will enable many Java > programmers to develop distributed applications. We believe that this > simplicity will attract developers who would otherwise be discouraged by > complexity, and many new use cases will emerge for the usage of YARN. > > Incubating Twill as an Apache project makes sense because Twill is a > framework built on top of YARN, and Twill uses Apache Zookeeper, HDFS, > Kafka, and other Apache software (see the External Dependencies section). > > = Current Status = > > Twill was initially developed at Continuuity under the name of Weave. The > Weave codebase is currently hosted in a public repository at github.com, > which will seed the Apache git repository after renaming to Twill. > > == Meritocracy == > > Our intent with this incubator proposal is to start building a diverse > developer community around Twill following the Apache meritocracy model. > Since Twill was initially developed in early 2013, we have had fast > adoption and contributions within Continuuity. We are looking forward to > new contributors. We wish to build a community based on Apache's > meritocracy principles, working with those who contribute significantly to > the project and welcoming them to be committers both during the incubation > process and beyond. > > == Community == > > Twill is currently being used internally at Continuuity and is at the core > of our products. We hope to extend our contributor base significantly and > we will invite all who are interested in simplifying the development of > distributed applications to participate. > > == Core Developers == > > Twill is currently being developed by five engineers at Continuuity: > Terence Yim, Andreas Neumann, Gary Helmling, Poorna Chandra and Albert > Shau. > Terence Yim is an Apache committer for Helix, Andreas is an Apache > committer and PMC member for Oozie, and Gary Helmling is an Apache > committer and PMC member for HBase. Poorna Chandra and Albert Shau have > made many contributions to Twill. > > == Alignment == > > The ASF is the natural choice to host the Twill project as its goal of > encouraging community-driven open source projects fits with our vision for > Twill. > > Additionally, many other projects with which we are familiar and expect > Twill to integrate with, such as ZooKeeper, YARN, HDFS, log4j, and others > mentioned in the External Dependencies section are Apache projects, and > Twill will benefit by close proximity to them. > > = Known Risks = > > == Orphaned Products == > > There is very little risk of Twill being orphaned, as it is a key part of > Continuuity’s products. The core Twill developers plan to continue to work > on Twill, and Continuuity has funding in place to support their efforts > going forward. > Many other Big Data companies can benefit from Twill, and we have already > received interest from various entities that would like to use and > contribute to Twill. > > == Inexperience with Open Source == > > Several of the core developers have experience with open source > development. Terence Yim, Andreas Neumann and Gary Helmling are currently > Apache committers for Helix, Oozie and HBase respectively > Homogeneous Developers > > The current core developers are all Continuuity employees. However, we > intend to establish a developer community that includes independent and > corporate contributors. We are encouraging new contributors via our mailing > lists, public presentations, and personal contacts, and we will continue to > do so. Various entities have already expressed interest in becoming > involved with Twill. > > == Reliance on Salaried Developers == > > Currently, these developers are paid to work on Twill. Once the project has > built a community, we expect to attract committers, developers and > community > other than the current core developers. However, because Continuuity > products use Twill internally, the reliance on salaried developers is > unlikely to change, at least in the near term. > > == Relationships with Other Apache Products == > > Twill is deeply integrated with Apache projects. Twill uses Apache YARN as > its underlying resource management and task scheduling system and Apache > Zookeeper for coordination. In addition, Twill uses Apache HDFS and Apache > Kafka. A number of other Apache projects are Twill dependencies and are > listed in the External Dependencies section. > > == An Excessive Fascination with the Apache Brand == > > While we respect the reputation of the Apache brand and have no doubt that > it will attract contributors and users, our interest is primarily to give > Twill a solid home as an open source project following an established > development model. We have also given additional reasons in the Rationale > and Alignment sections. > > = Documentation = > > The current documentation for Weave is at > https://github.com/continuuity/weave. > This will be adapted to the new name Twill. > > = Initial Source = > > The Weave codebase is currently hosted at > https://github.com/continuuity/weave. Weave will be renamed to Twill to > seed the Apache git repository. > > = External Dependencies = > > The dependencies all have Apache-compatible licenses: > * avro (Apache 2.0) > * hadoop (Apache 2.0) > * gson (Apache 2.0) > * guava-libraries (Apache 2.0) > * hbase (Apache 2.0) > * hdfs (Apache 2.0) > * kafka (Apache 2.0) > * netty (Apache 2.0) > * snappy-java (Apache 2.0) > * yarn (Apache 2.0) > * zookeeper (Apache 2.0) > * asm (BSD) > * junit (EPL v1.0) > * logback (EPL v1.0 ) > * slf4j (MIT) > > = Cryptography = > > Twill will depend on secure Hadoop, which can optionally use Kerberos. > > = Required Resources = > > == Mailing Lists == > > * twill-private for private PMC discussions (with moderated subscriptions) > * twill-dev for technical discussions among contributors > * twill-commits for notification about commits > > == Subversion Directory == > > Git is the preferred source control system: git://git.apache.org/twill > > == Issue Tracking == > > JIRA Twill (TWILL) > > == Other Resources == > > The existing code already has unit tests, so we would like a Hudson > instance to run them whenever a new patch is submitted. This can be added > after project creation. > > = Initial Committers = > > * Terence Yim > * Andreas Neumann > * Gary Helmling > * Poorna Chandra > * Albert Shau > > = Affiliations = > > * Terence Yim (Continuuity) > * Andreas Neumann (Continuuity) > * Gary Helmling (Continuuity) > * Poorna Chandra (Continuuity) > * Albert Shau (Continuuity) > > = Sponsors = > > == Champion == > > Vinod K <vinodkv at apache dot org> (Apache Member) > > == Nominated Mentors == > > * Arun C Murthy <acmurthy at apache dot org> > * Tom White <tomwhite at apache dot org> > * Patrick Hunt <phunt at apache dot org> > * Andrei Savu <asavu at apache dot org> > > == Sponsoring Entity == > > We are requesting that the Incubator sponsor this project. >
