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From: Todd Lipcon <todd@cloudera.com>
Date: Wed, 14 May 2014 09:59:52 -0700
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Subject: Re: [PROPOSAL] Parquet
To: general@incubator.apache.org
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Proposal looks good to me! Eagerly awaiting the vote.

-Todd


On Mon, May 12, 2014 at 10:02 AM, Chris Aniszczyk <caniszczyk@gmail.com>wrote:

> We would like to propose Parquet as an Apache Incubator project.
> https://wiki.apache.org/incubator/ParquetProposal
>
> Feel free to comment, we'll go for a vote in a week or two or whenever
> consensus has been reached on the proposal.
>
> I've posted posted the text of the proposal below:
>
> == Abstract ==
> Parquet is a columnar storage format for Hadoop.
>
> == Proposal ==
>
> We created Parquet to make the advantages of compressed, efficient columnar
> data representation available to any project in the Hadoop ecosystem,
> regardless of the choice of data processing framework, data model, or
> programming language.
>
> == Background ==
>
> Parquet is built from the ground up with complex nested data structures in
> mind, and uses the repetition/definition level approach to encoding such
> data structures, as popularized by Google Dremel (
> https://blog.twitter.com/2013/dremel-made-simple-with-parquet). We believe
> this approach is superior to simple flattening of nested name spaces.
>
> Parquet is built to support very efficient compression and encoding
> schemes. Parquet allows compression schemes to be specified on a per-column
> level, and is future-proofed to allow adding more encodings as they are
> invented and implemented. We separate the concepts of encoding and
> compression, allowing parquet consumers to implement operators that work
> directly on encoded data without paying decompression and decoding penalty
> when possible.
>
> == Rationale ==
>
> Parquet is built to be used by anyone. We believe that an efficient,
> well-implemented columnar storage substrate should be useful to all
> frameworks without the cost of extensive and difficult to set up
> dependencies.
>
> Furthermore, the rapid growth of Parquet community is empowered by open
> source. We believe the Apache foundation is a great fit as the long-term
> home for Parquet, as it provides an established process for
> community-driven development and decision making by consensus. This is
> exactly the model we want for future Parquet development.
>
> == Initial Goals ==
>
> * Move the existing codebase to Apache
> * Integrate with the Apache development process
> * Ensure all dependencies are compliant with Apache License version 2.0
> * Incremental development and releases per Apache guidelines
>
> == Current Status ==
>
> Parquet has undergone 2 major releases:
> https://github.com/Parquet/parquet-format/releases of the core format and
> 22 releases: https://github.com/Parquet/parquet-mr/releases of the
> supporting set of Java libraries.
>
> The Parquet source is currently hosted at GitHub, which will seed the
> Apache git repository.
>
> === Meritocracy ===
>
> We plan to invest in supporting a meritocracy. We will discuss the
> requirements in an open forum. Several companies have already expressed
> interest in this project, and we intend to invite additional developers to
> participate. We will encourage and monitor community participation so that
> privileges can be extended to those that contribute.
>
> === Community ===
>
> There is a large need for an advanced columnar storage format for Hadoop.
> Parquet is being used in production by many organizations (see
> https://github.com/Parquet/parquet-mr/blob/master/PoweredBy.md)
>
>  * Cloudera: https://twitter.com/HenryR/statuses/324222874011451392
>  * Criteo: https://twitter.com/julsimon/statuses/312114074911666177
>  * Salesforce: https://twitter.com/TwitterOSS/statuses/392734610116726784
>  * Stripe: https://twitter.com/avibryant/statuses/391339949250715648
>  * Twitter: https://twitter.com/J_/statuses/315844725611581441
>
> By bringing Parquet into Apache, we believe that the community will grow
> even bigger.
>
> === Core Developers ===
>
> Parquet was initially developed as a collaboration between Twitter,
> Cloudera and Criteo.
>
> See
>
> https://blog.twitter.com/2013/announcing-parquet-10-columnar-storage-for-hadoop
>
> === Alignment ===
>
> We believe that having Parquet at Apache will help further the growth of
> the big-data community, as it will encourage cooperation within the greater
> ecosystem of projects spawned by Apache Hadoop. The alignment is also
> beneficial to other Apache communities (such as Hadoop, Hive, Avro).
>
> == Known Risks ==
>
> === Orphaned Products ===
>
> The risk of the Parquet project being abandoned is minimal. There are many
> organizations using Parquet in production, including Twitter, Cloudera,
> Stripe, and Salesforce (
> http://blog.cloudera.com/blog/2013/10/parquet-at-salesforce-com/).
>
> === Inexperience with Open Source ===
>
> Parquet has existed as a healthy open source for one year. During that
> time, we have curated an open-source community successfully, attracting
> over 40 contributors (see
> https://github.com/Parquet/parquet-mr/graphs/contributors) from a diverse
> group of companies.
> Several of the core contributors to the project are deeply familiar with
> OSS and Apache specifically: Julien Le Dem is the current PMC Chair for
> Apache Pig, and Dmitriy Ryaboy, Aniket Mokashi, and Jonathan Coveney are
> also Apache Pig committers with contributions to several other Apache
> projects. Todd Lipcon and Tom White are committers to Apache Hadoop and
> multiple other related projects. Brock Noland is a Hive committer.
>
> === Homogenous Developers ===
>
> The initial committers come from a number of companies and countries.
> Parquet has an active community of developers, and we are committed to
> recruiting additional committers based on their contributions to the
> project. The java library component alone has contributions from 31
> individual github accounts, 14 of which contributed over 1000 lines of
> code.
>
> === Reliance on Salaried Developers ===
>
> It is expected that Parquet development will occur on both salaried time
> and on volunteer time, after hours. The majority of initial committers are
> paid by their employers to contribute to this project. However, they are
> all passionate about the project, and we are confident that the project
> will continue even if no salaried developers contribute to the project. As
> evidence of this statement, we present the GitHub punchcard (see
> https://github.com/Parquet/parquet-mr/graphs/punch-card) showing that a
> lot
> of activity happens on weekends. We are committed to recruiting additional
> committers including non-salaried developers.
>
> === Relationships with Other Apache Products ===
>
> As mentioned in the Alignment section, Parquet is closely related to
> Hadoop, Pig, Avro, Thrift, YARN and Mesos in a numerous ways. We look
> forward to collaborating with those communities, as well as other Apache
> communities (including Apache S4 which focuses on stateful low-latency
> processing).
>
> === An Excessive Fascination with the Apache Brand ===
>
> Parquet is an already healthy and well known open source project. This
> proposal is not for the purpose of generating publicity. Rather, the
> primary benefits to joining Apache are those outlined in the Rationale
> section.
>
> == Documentation ==
>
> Documentation is currently located as README markdown files:
>
> * https://github.com/Parquet/parquet-format
> * https://github.com/Parquet/parquet-mr
>
> == Source and Intellectual Property Submission Plan ==
>
> The Parquet codebase is currently hosted on Github:
> https://github.com/Parquet.
>
> This is the exact codebase that we would migrate to the Apache foundation.
>
> == External Dependencies ==
>
>  * Junit: EPL
>  * Apache Commons: ALv2
>  * Apache Thrift: ALv2
>  * Apache Maven: ALv2
>  * Apache Avro: ALv2
>  * Apache Hadoop: ALv2
>  * Google Guava: ALv2
>
> == Cryptography ==
>
> We do not expect Parquet to be a controlled export item due to the use of
> encryption.
>
> == Required Resources ==
>
> === Mailing lists ===
>
>  * parquet-dev
>  * parquet-user
>
> == Subversion Directory ==
>
> Git is the preferred source control system: git://git.apache.org/parquet
>
> == Issue Tracking ==
>
> JIRA: Parquet (PARQUET)
>
> == Initial Committers ==
>
>  * Aniket Mokashi
>  * Brock Noland
>  * Chris Aniszczyk <zx@twitter.com>
>  * Dmitriy Ryaboy <dmitriy@twitter.com>
>  * Jake Farrell
>  * Julien Le Dem <julien@apache.org>
>  * Lukas Nalezenec
>  * Marcel Kornacker
>  * Mickael Lacour
>  * Nong Li
>  * Remy Pecqueur
>  * Tianshuo Deng
>  * Tom White
>
> == Affiliations ==
>
>  * Aniket Mokashi - Twitter
>  * Brock Noland - Cloudera
>  * Chris Aniszczyk - Twitter
>  * Dmitriy Ryaboy - Twitter
>  * Jake Farrell
>  * Julien Le Dem - Twitter
>  * Lukas Nalezenec
>  * Marcel Kornacker - Cloudera
>  * Mickael Lacour - Criteo
>  * Nong Li - Cloudera
>  * Remy Pecqueur - Criteo
>  * Tianshuo Deng - Twitter
>  * Tom White - Cloudera
>
> == Sponsors ==
>
> === Champion ===
>
>  * Todd Lipcon
>
> === Nominated Mentors ===
>
>  * Tom White
>  * Chris Mattmann
>  * Jake Farrell
>
> === Sponsoring Entity ===
>
> The Apache Incubator
>
> --
> Cheers,
>
> Chris Aniszczyk
> http://aniszczyk.org
> +1 512 961 6719
>


-- 
Todd Lipcon
Software Engineer, Cloudera

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