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From: Arvind Prabhakar <arvind@apache.org>
Date: Tue, 24 Nov 2015 12:08:10 -0800
Message-ID: 
 <CAHUddLMigEL+qgUd+1Ccztq=NKu75T3zWz3CSVOSrLxaCadmMw@mail.gmail.com>
Subject: Re: [VOTE] Accept Kudu into the Apache Incubator
To: general@incubator.apache.org
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+1 (binding)

Regards,
Arvind Prabhakar

On Tue, Nov 24, 2015 at 11:32 AM, Todd Lipcon <todd@apache.org> wrote:

> Hi all,
>
> Discussion on the [DISCUSS] thread seems to have wound down, so I'd like =
to
> call a VOTE on acceptance of Kudu into the ASF Incubator. The proposal is
> pasted below and also available on the wiki at:
> https://wiki.apache.org/incubator/KuduProposal
>
> The proposal is unchanged since the original version, except for the
> addition of Carl Steinbach as a Mentor.
>
> Please cast your votes:
>
> [] +1, accept Kudu into the Incubator
> [] +/-0, positive/negative non-counted expression of feelings
> [] -1, do not accept Kudu into the incubator (please state reasoning)
>
> Given the US holiday this week, I imagine many folks are traveling or
> otherwise offline. So, let's run the vote for a full week rather than the
> traditional 72 hours. Unless the IPMC objects to the extended voting
> period, the vote will close on Tues, Dec 1st at noon PST.
>
> Thanks
> -Todd
> -----
>
> =3D Kudu Proposal =3D
>
> =3D=3D Abstract =3D=3D
>
> Kudu is a distributed columnar storage engine built for the Apache Hadoop
> ecosystem.
>
> =3D=3D Proposal =3D=3D
>
> Kudu is an open source storage engine for structured data which supports
> low-latency random access together with efficient analytical access
> patterns. Kudu distributes data using horizontal partitioning and
> replicates each partition using Raft consensus, providing low
> mean-time-to-recovery and low tail latencies. Kudu is designed within the
> context of the Apache Hadoop ecosystem and supports many integrations wit=
h
> other data analytics projects both inside and outside of the Apache
> Software Foundation.
>
>
>
> We propose to incubate Kudu as a project of the Apache Software Foundatio=
n.
>
> =3D=3D Background =3D=3D
>
> In recent years, explosive growth in the amount of data being generated a=
nd
> captured by enterprises has resulted in the rapid adoption of open source
> technology which is able to store massive data sets at scale and at low
> cost. In particular, the Apache Hadoop ecosystem has become a focal point
> for such =E2=80=9Cbig data=E2=80=9D workloads, because many traditional o=
pen source
> database systems have lagged in offering a scalable alternative.
>
>
>
> Structured storage in the Hadoop ecosystem has typically been achieved in
> two ways: for static data sets, data is typically stored on Apache HDFS
> using binary data formats such as Apache Avro or Apache Parquet. However,
> neither HDFS nor these formats has any provision for updating individual
> records, or for efficient random access. Mutable data sets are typically
> stored in semi-structured stores such as Apache HBase or Apache Cassandra=
.
> These systems allow for low-latency record-level reads and writes, but la=
g
> far behind the static file formats in terms of sequential read throughput
> for applications such as SQL-based analytics or machine learning.
>
>
>
> Kudu is a new storage system designed and implemented from the ground up =
to
> fill this gap between high-throughput sequential-access storage systems
> such as HDFS and low-latency random-access systems such as HBase or
> Cassandra. While these existing systems continue to hold advantages in so=
me
> situations, Kudu offers a =E2=80=9Chappy medium=E2=80=9D alternative that=
 can dramatically
> simplify the architecture of many common workloads. In particular, Kudu
> offers a simple API for row-level inserts, updates, and deletes, while
> providing table scans at throughputs similar to Parquet, a commonly-used
> columnar format for static data.
>
>
>
> More information on Kudu can be found at the existing open source project
> website: http://getkudu.io and in particular in the Kudu white-paper PDF:
> http://getkudu.io/kudu.pdf from which the above was excerpted.
>
> =3D=3D Rationale =3D=3D
>
> As described above, Kudu fills an important gap in the open source storag=
e
> ecosystem. After our initial open source project release in September 201=
5,
> we have seen a great amount of interest across a diverse set of users and
> companies. We believe that, as a storage system, it is critical to build =
an
> equally diverse set of contributors in the development community. Our
> experiences as committers and PMC members on other Apache projects have
> taught us the value of diverse communities in ensuring both longevity and
> high quality for such foundational systems.
>
> =3D=3D Initial Goals =3D=3D
>
>  * Move the existing codebase, website, documentation, and mailing lists =
to
> Apache-hosted infrastructure
>  * Work with the infrastructure team to implement and approve our code
> review, build, and testing workflows in the context of the ASF
>  * Incremental development and releases per Apache guidelines
>
> =3D=3D Current Status =3D=3D
>
> =3D=3D=3D=3D Releases =3D=3D=3D=3D
>
> Kudu has undergone one public release, tagged here
> https://github.com/cloudera/kudu/tree/kudu0.5.0-release
>
> This initial release was not performed in the typical ASF fashion -- no
> source tarball was released, but rather only convenience binaries made
> available in Cloudera=E2=80=99s repositories. We will adopt the ASF sourc=
e release
> process upon joining the incubator.
>
>
> =3D=3D=3D=3D Source =3D=3D=3D=3D
>
> Kudu=E2=80=99s source is currently hosted on GitHub at
> https://github.com/cloudera/kudu
>
> This repository will be transitioned to Apache=E2=80=99s git hosting duri=
ng
> incubation.
>
>
>
> =3D=3D=3D=3D Code review =3D=3D=3D=3D
>
> Kudu=E2=80=99s code reviews are currently public and hosted on Gerrit at
> http://gerrit.cloudera.org:8080/#/q/status:open+project:kudu
>
> The Kudu developer community is very happy with gerrit and hopes to work
> with the Apache Infrastructure team to figure out how we can continue to
> use Gerrit within ASF policies.
>
>
>
> =3D=3D=3D=3D Issue tracking =3D=3D=3D=3D
>
> Kudu=E2=80=99s bug and feature tracking is hosted on JIRA at:
> https://issues.cloudera.org/projects/KUDU/summary
>
> This JIRA instance contains bugs and development discussion dating back 2
> years prior to Kudu=E2=80=99s open source release and will provide an ini=
tial seed
> for the ASF JIRA.
>
>
>
> =3D=3D=3D=3D Community discussion =3D=3D=3D=3D
>
> Kudu has several public discussion forums, linked here:
> http://getkudu.io/community.html
>
>
>
> =3D=3D=3D=3D Build Infrastructure =3D=3D=3D=3D
>
> The Kudu Gerrit instance is configured to only allow patches to be
> committed after running them through an extensive set of pre-commit tests
> and code lints. The project currently makes use of elastic public cloud
> resources to perform these tests. Until this point, these resources have
> been internal to Cloudera, though we are currently investing in moving to=
 a
> publicly accessible infrastructure.
>
>
>
> =3D=3D=3D=3D Development practices =3D=3D=3D=3D
>
> Given that Kudu is a persistent storage engine, the community has a high
> quality bar for contributions to its core. We have a firm belief that hig=
h
> quality is achieved through automation, not manual inspection, and hence
> put a focus on thorough testing and build infrastructure to ensure that
> bar. The development community also practices review-then-commit for all
> changes to ensure that changes are accompanied by appropriate tests, are
> well commented, etc.
>
> Rather than seeing these practices as barriers to contribution, we believ=
e
> that a fully automated and standardized review and testing practice makes
> it easier for new contributors to have patches accepted. Any new develope=
r
> may post a patch to Gerrit using the same workflow as a seasoned
> contributor, and the same suite of tests will be automatically run. If th=
e
> tests pass, a committer can quickly review and commit the contribution fr=
om
> their web browser.
>
> =3D=3D=3D Meritocracy =3D=3D=3D
>
> We believe strongly in meritocracy in electing committers and PMC members=
.
> We believe that contributions can come in forms other than just code: for
> example, one of our initial proposed committers has contributed solely in
> the area of project documentation. We will encourage contributions and
> participation of all types, and ensure that contributors are appropriatel=
y
> recognized.
>
> =3D=3D=3D Community =3D=3D=3D
>
> Though Kudu is relatively new as an open source project, it has already
> seen promising growth in its community across several organizations:
>
>  * '''Cloudera''' is the original development sponsor for Kudu.
>  * '''Xiaomi''' has been helping to develop and optimize Kudu for a new
> production use case, contributing code, benchmarks, feedback, and
> conference talks.
>  * '''Intel''' has contributed optimizations related to their hardware
> technologies.
>  * '''Dropbox''' has been experimenting with Kudu for a machine monitorin=
g
> use case, and has been contributing bug reports and product feedback.
>  * '''Dremio''' is working on integration with Apache Drill and exploring
> using Kudu in a production use case.
>  * Several community-built Docker images, tutorials, and blog posts have
> sprouted up since Kudu=E2=80=99s release.
>
>
>
> By bringing Kudu to Apache, we hope to encourage further contribution fro=
m
> the above organizations as well as to engage new users and contributors i=
n
> the community.
>
> =3D=3D=3D Core Developers =3D=3D=3D
>
> Kudu was initially developed as a project at Cloudera. Most of the
> contributions to date have been by developers employed by Cloudera.
>
>
>
> Many of the developers are committers or PMC members on other Apache
> projects.
>
> =3D=3D=3D Alignment =3D=3D=3D
>
> As a project in the big data ecosystem, Kudu is aligned with several othe=
r
> ASF projects. Kudu includes input/output format integration with Apache
> Hadoop, and this integration can also provide a bridge to Apache Spark. W=
e
> are planning to integrate with Apache Hive in the near future. We also
> integrate closely with Cloudera Impala, which is also currently being
> proposed for incubation. We have also scheduled a hackathon with the Apac=
he
> Drill team to work on integration with that query engine.
>
> =3D=3D Known Risks =3D=3D
>
> =3D=3D=3D Orphaned Products =3D=3D=3D
>
> The risk of Kudu being abandoned is low. Cloudera has invested a great de=
al
> in the initial development of the project, and intends to grow its
> investment over time as Kudu becomes a product adopted by its customer
> base. Several other organizations are also experimenting with Kudu for
> production use cases which would live for many years.
>
> =3D=3D=3D Inexperience with Open Source =3D=3D=3D
>
> Kudu has been released in the open for less than two months. However, fro=
m
> our very first public announcement we have been committed to open-source
> style development:
>
>  * our code reviews are fully public and documented on a mailing list
>  * our daily development chatter is in a public chat room
>  * we send out weekly =E2=80=9Ccommunity status=E2=80=9D reports highligh=
ting news and
> contributions
>  * we published our entire JIRA history and discuss bugs in the open
>  * we published our entire Git commit history, going back three years (no
> squashing)
>
>
>
> Several of the initial committers are experienced open source developers,
> several being committers and/or PMC members on other ASF projects (Hadoop=
,
> HBase, Thrift, Flume, et al). Those who are not ASF committers have
> experience on non-ASF open source projects (Kiji, open-vm-tools, et al).
>
> =3D=3D=3D Homogenous Developers =3D=3D=3D
>
> The initial committers are employees or former employees of Cloudera.
> However, the committers are spread across multiple offices (Palo Alto, Sa=
n
> Francisco, Melbourne), so the team is familiar with working in a
> distributed environment across varied time zones.
>
>
>
> The project has received some contributions from developers outside of
> Cloudera, and is starting to attract a ''user'' community as well. We hop=
e
> to continue to encourage contributions from these developers and communit=
y
> members and grow them into committers after they have had time to continu=
e
> their contributions.
>
> =3D=3D=3D Reliance on Salaried Developers =3D=3D=3D
>
> As mentioned above, the majority of development up to this point has been
> sponsored by Cloudera. We have seen several community users participate i=
n
> discussions who are hobbyists interested in distributed systems and
> databases, and hope that they will continue their participation in the
> project going forward.
>
> =3D=3D=3D Relationships with Other Apache Products =3D=3D=3D
>
> Kudu is currently related to the following other Apache projects:
>
>  * Hadoop: Kudu provides MapReduce input/output formats for integration
>  * Spark: Kudu integrates with Spark via the above-mentioned input format=
s,
> and work is progressing on support for Spark Data Frames and Spark SQL.
>
>
>
> The Kudu team has reached out to several other Apache projects to start
> discussing integrations, including Flume, Kafka, Hive, and Drill.
>
>
>
> Kudu integrates with Impala, which is also being proposed for incubation.
>
>
>
> Kudu is already collaborating on ValueVector, a proposed TLP spinning out
> from the Apache Drill community.
>
>
>
> We look forward to continuing to integrate and collaborate with these
> communities.
>
> =3D=3D=3D An Excessive Fascination with the Apache Brand =3D=3D=3D
>
> Many of the initial committers are already experienced Apache committers,
> and understand the true value provided by the Apache Way and the principl=
es
> of the ASF. We believe that this development and contribution model is
> especially appropriate for storage products, where Apache=E2=80=99s
> community-over-code philosophy ensures long term viability and
> consensus-based participation.
>
> =3D=3D Documentation =3D=3D
>
>  * Documentation is written in AsciiDoc and committed in the Kudu source
> repository:
>
>  * https://github.com/cloudera/kudu/tree/master/docs
>
>
>
>  * The Kudu web site is version-controlled on the =E2=80=98gh-pages=E2=80=
=99 branch of the
> above repository.
>
>  * A LaTeX whitepaper is also published, and the source is available with=
in
> the same repository.
>  * APIs are documented within the source code as JavaDoc or C++-style
> documentation comments.
>  * Many design documents are stored within the source code repository as
> text files next to the code being documented.
>
> =3D=3D Source and Intellectual Property Submission Plan =3D=3D
>
> The Kudu codebase and web site is currently hosted on GitHub and will be
> transitioned to the ASF repositories during incubation. Kudu is already
> licensed under the Apache 2.0 license.
>
>
>
> Some portions of the code are imported from other open source projects
> under the Apache 2.0, BSD, or MIT licenses, with copyrights held by autho=
rs
> other than the initial committers. These copyright notices are maintained
> in those files as well as a top-level NOTICE.txt file. We believe this to
> be permissible under the license terms and ASF policies, and confirmed vi=
a
> a recent thread on general@incubator.apache.org .
>
>
>
> The =E2=80=9CKudu=E2=80=9D name is not a registered trademark, though bef=
ore the initial
> release of the project, we performed a trademark search and Cloudera=E2=
=80=99s
> legal counsel deemed it acceptable in the context of a data storage engin=
e.
> There exists an unrelated open source project by the same name related to
> deployments on Microsoft=E2=80=99s Azure cloud service. We have been in c=
ontact
> with legal counsel from Microsoft and have obtained their approval for th=
e
> use of the Kudu name.
>
>
>
> Cloudera currently owns several domain names related to Kudu (getkudu.io,
> kududb.io, et al) which will be transferred to the ASF and redirected to
> the official page during incubation.
>
>
>
> Portions of Kudu are protected by pending or published patents owned by
> Cloudera. Given the protections already granted by the Apache License, we
> do not anticipate any explicit licensing or transfer of this intellectual
> property.
>
> =3D=3D External Dependencies =3D=3D
>
> The full set of dependencies and licenses are listed in
> https://github.com/cloudera/kudu/blob/master/LICENSE.txt
>
> and summarized here:
>
>  * '''Twitter Bootstrap''': Apache 2.0
>  * '''d3''': BSD 3-clause
>  * '''epoch JS library''': MIT
>  * '''lz4''': BSD 2-clause
>  * '''gflags''': BSD 3-clause
>  * '''glog''': BSD 3-clause
>  * '''gperftools''': BSD 3-clause
>  * '''libev''': BSD 2-clause
>  * '''squeasel''':MIT license
>  * '''protobuf''': BSD 3-clause
>  * '''rapidjson''': MIT
>  * '''snappy''': BSD 3-clause
>  * '''trace-viewer''': BSD 3-clause
>  * '''zlib''': zlib license
>  * '''llvm''': University of Illinois/NCSA Open Source (BSD-alike)
>  * '''bitshuffle''': MIT
>  * '''boost''': Boost license
>  * '''curl''': MIT
>  * '''libunwind''': MIT
>  * '''nvml''': BSD 3-clause
>  * '''cyrus-sasl''': Cyrus SASL license (BSD-alike)
>  * '''openssl''': OpenSSL License (BSD-alike)
>
>  * '''Guava''': Apache 2.0
>  * '''StumbleUpon Async''': BSD
>  * '''Apache Hadoop''': Apache 2.0
>  * '''Apache log4j''': Apache 2.0
>  * '''Netty''': Apache 2.0
>  * '''slf4j''': MIT
>  * '''Apache Commons''': Apache 2.0
>  * '''murmur''': Apache 2.0
>
>
> '''Build/test-only dependencies''':
>
>  * '''CMake''': BSD 3-clause
>  * '''gcovr''': BSD 3-clause
>  * '''gmock''': BSD 3-clause
>  * '''Apache Maven''': Apache 2.0
>  * '''JUnit''': EPL
>  * '''Mockito''': MIT
>
> =3D=3D Cryptography =3D=3D
>
> Kudu does not currently include any cryptography-related code.
>
> =3D=3D Required Resources =3D=3D
>
> =3D=3D=3D Mailing lists =3D=3D=3D
>
>  * private@kudu.incubator.apache.org (PMC)
>  * commits@kudu.incubator.apache.org (git push emails)
>  * issues@kudu.incubator.apache.org (JIRA issue feed)
>  * dev@kudu.incubator.apache.org (Gerrit code reviews plus dev discussion=
)
>  * user@kudu.incubator.apache.org (User questions)
>
>
> =3D=3D=3D Repository =3D=3D=3D
>
>  * git://git.apache.org/kudu
>
> =3D=3D=3D Gerrit =3D=3D=3D
>
> We hope to continue using Gerrit for our code review and commit workflow.
> The Kudu team has already been in contact with Jake Farrell to start
> discussions on how Gerrit can fit into the ASF. We know that several othe=
r
> ASF projects and podlings are also interested in Gerrit.
>
>
>
> If the Infrastructure team does not have the bandwidth to support Gerrit,
> we will continue to support our own instance of Gerrit for Kudu, and make
> the necessary integrations such that commits are properly authenticated a=
nd
> maintain sufficient provenance to uphold the ASF standards (e.g. via the
> solution adopted by the AsterixDB podling).
>
> =3D=3D Issue Tracking =3D=3D
>
> We would like to import our current JIRA project into the ASF JIRA, such
> that our historical commit messages and code comments continue to referen=
ce
> the appropriate bug numbers.
>
> =3D=3D Initial Committers =3D=3D
>
>  * Adar Dembo adar@cloudera.com
>  * Alex Feinberg alex@strlen.net
>  * Andrew Wang wang@apache.org
>  * Dan Burkert dan@cloudera.com
>  * David Alves dralves@apache.org
>  * Jean-Daniel Cryans jdcryans@apache.org
>  * Mike Percy mpercy@apache.org
>  * Misty Stanley-Jones misty@apache.org
>  * Todd Lipcon todd@apache.org
>
> The initial list of committers was seeded by listing those contributors w=
ho
> have contributed 20 or more patches in the last 12 months, indicating tha=
t
> they are active and have achieved merit through participation on the
> project. We chose not to include other contributors who either have not y=
et
> contributed a significant number of patches, or whose contributions are f=
ar
> in the past and we don=E2=80=99t expect to be active within the ASF.
>
> =3D=3D Affiliations =3D=3D
>
>  * Adar Dembo - Cloudera
>  * Alex Feinberg - Forward Networks
>  * Andrew Wang - Cloudera
>  * Dan Burkert - Cloudera
>  * David Alves - Cloudera
>  * Jean-Daniel Cryans - Cloudera
>  * Mike Percy - Cloudera
>  * Misty Stanley-Jones - Cloudera
>  * Todd Lipcon - Cloudera
>
> =3D=3D Sponsors =3D=3D
>
> =3D=3D=3D Champion =3D=3D=3D
>
>  * Todd Lipcon
>
> =3D=3D=3D Nominated Mentors =3D=3D=3D
>
>  * Jake Farrell - ASF Member and Infra team member, Acquia
>  * Brock Noland - ASF Member, StreamSets
>  * Michael Stack - ASF Member, Cloudera
>  * Jarek Jarcec Cecho - ASF Member, Cloudera
>  * Chris Mattmann - ASF Member, NASA JPL and USC
>  * Julien Le Dem - Incubator PMC, Dremio
>  * Carl Steinbach - ASF Member, LinkedIn
>
> =3D=3D=3D Sponsoring Entity =3D=3D=3D
>
> The Apache Incubator
>

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