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From Apache Wiki <>
Subject [Incubator Wiki] Update of "FluoProposal" by ChristopherTubbs
Date Tue, 19 Apr 2016 17:15:30 GMT
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The "FluoProposal" page has been changed by ChristopherTubbs:

Create Fluo Proposal

New page:
= Fluo Proposal =

== Abstract ==

Fluo is a distributed system for incrementally processing large data sets stored in Accumulo.

== Proposal ==

Fluo is a distributed transaction and notification system that enables the incremental processing
of large data sets. Its transaction system allows for concurrent, cross-node updates to data
stored in Accumulo. Its notification system enables developers to write code to be executed
when observed data changes. Fluo provides a core API to perform transactional updates using
minimalistic get/set methods. Fluo also provides a higher order recipes API that builds on
the core API to support more complex methods for transactional updates.

== Background ==

Several frameworks exist for batch (i.e Spark, MapReduce) and stream (i.e Storm, Spark Streaming)
processing of data. While batch and stream processing have strong use cases, they are not
suited for joining incoming data in real-time to a large existing data set. To fill this need,
Google developed an incremental processing system called Percolator and described it in the
paper, ''Large-scale Incremental Processing Using Distributed Transactions and Notifications''<<FootNote(USENIX

== Rationale ==

Fluo fills the need for cross-row (and cross-node) transactions in Accumulo by providing it
with an open source implementation of Percolator. Fluo also satisfies a gap in Accumulo’s
ability to incrementally process data. Fluo also provides a novel recipes API which offers
higher level abstractions for transactional updates.

== Current Status ==

Fluo currently exists as an open source project on GitHub and has been in active development
since 2013. The project has made an alpha release and two beta releases. The major features
of Fluo outlined in this proposal have been implemented. Several example Fluo applications
have been created and run successfully on clusters (up to 24 nodes).

=== Meritocracy ===

The Fluo project operates as a meritocracy and will continue to do so because we feel that
a project comprised of a diverse set of committers will thrive. Therefore, we welcome new
contributors and encourage them on their path to committership.

=== Community ===

Fluo is currently being used by a subset of the Accumulo community. The initial developers
have been responsive to external contributions through pull requests and issues on GitHub.
As Fluo releases a stable 1.0 version that is production-ready, we expect this community to
grow. To encourage growth, we have created a project website with documentation, given talks
at Meetups and the Accumulo Summit, and engaged with new users on GitHub and the Fluo mailing

=== Core Developers ===

The project was started by Keith Turner (an Apache Member and committer/PMC on Gora and Accumulo)
in 2013, and the development has primarily consisted of his and Mike Walch’s continued efforts.
Additional developers have contributed over time, which has led to new committers.

=== Alignment ===

Fluo is closely linked to the Accumulo community, and fits well within the larger Hadoop ecosystem
at Apache. Fluo utilizes several Apache projects, such as Accumulo, YARN, Twill, and ZooKeeper.
Enabling closer collaboration between these communities through its coexistence within the
ASF would help further drive the success of them all.

In addition to our technical ties to other ASF projects, our development philosophy aligns
with Apache philosophies. Based on our experience with existing Apache projects, we are interested
in establishing formal governance with a PMC and community bylaws, which we feel would best
be done within Apache.

== Known Risks ==

=== Orphaned Products ===

Fluo could be orphaned if the project fails to gain adoption and the core developers abandon
their interest (this is not anticipated). This risk can be mitigated by attracting more committers
and developing further documentation to ease adoption.

=== Inexperience with Open Source ===

Fluo has been an open source project on GitHub from the start of its development. Several
Fluo developers are committers on other ASF projects as well as open source projects outside
ASF, and understand open source development.

=== Homogeneous Developers ===

The initial committers work for different employers. We hope add more developers from other
employers and industries.

=== Reliance on Salaried Developers ===

While most of the initial committers are paid to work on Fluo, there have been many contributions
from developers working independently.

=== Relationships with Other Apache Products ===

Fluo uses Accumulo, Hadoop (HDFS & YARN), Twill, ZooKeeper, Curator, Thrift, and various
Commons libraries. During development, contributions have been made to some of these Apache
projects to better support Fluo use cases.

=== Apache Brand ===

While we recognize the impact of the Apache brand, we feel that Fluo would fit well in Apache
because of its relationship to other Apache projects and because we share the ASF values of
meritocracy and community over code.

== Documentation ==

Information about Fluo can be found on the project website at This includes:

 * General documentation -
 * API documentation -
 * Release notes -
 * Blog posts -

== Initial Source ==

The initial source code is publicly available as an open source project on GitHub at

Supplemental repositories also exist on GitHub at and some of those
will become part of the initial code base (perhaps in separate repositories).

== Source and Intellectual Property Submission Plan ==

All of the Fluo’s source code is available under the Apache License, Version 2.

The Fluo logo was designed and contributed to the Fluo project, for use by the project, and
the contributors would like it to remain the logo of the project within the ASF, granting
any necessary rights to the ASF, while continuing to use the logo on Fluo-related historical
sites and project pages (such as Fluo’s current GitHub site).

== External Dependencies ==

Fluo has made it a point from its beginning to use dependencies which are compatible with
the expectations of an ASF project. The following are its current dependencies, grouped by

Apache License, Version 2.0
 * accumulo
 * commons-{collections,configuration,io}
 * curator
 * dropwizard metrics
 * easymock
 * guava
 * hadoop
 * jcommander
 * maven
 * thrift
 * twill
 * zookeeper

BSD License (2-Clause)
 * HdrHistogram

Eclipse Public License - v 1.0
 * junit (not bundled)
 * logback (binary bundling only)

MIT License (Expat)
 * slf4j

== Cryptography ==


== Required Resources ==

=== Mailing Lists ===

   * private at
   * dev at
   * notifications at

=== Git Repository ===

     (The developers will use a git-based site for project documentation in the ''asf-site''
branch of the repo.)

=== Issue Tracking ===

     (Currently, the developers rely on GitHub issues. If possible, GitHub integration for
issue tracking would be preferred. If this is possible, the Fluo developers could work with
INFRA to transfer the existing GitHub repositories to the Apache GitHub organization to bring
the existing GitHub issues.)

=== Continuous Integration ===

   * Travis CI on the GitHub mirror is fine (flag set to build only if ''.travis.yml'' file
is present)

== Initial Committers ==

 * Keith Turner (kturner at apache dot org)
 * Mike Walch (mike.walch at ptech-llc dot com)
 * Corey Nolet (cjnolet at apache dot org)
 * Christopher Tubbs (ctubbsii at apache dot org)
 * Josh Elser (elserj at apache dot org)

== Affiliations ==

 * Keith Turner (Peterson Technologies, ASF Member, Accumulo PMC, Gora PMC)
 * Mike Walch (Peterson Technologies)
 * Corey Nolet (Tetra Concepts LLC, Accumulo PMC)
 * Christopher Tubbs (U.S. Government, ASF Member, Accumulo PMC)
 * Josh Elser (Hortonworks, ASF Member, Accumulo PMC, Calcite PMC, IPMC)

== Sponsors ==

=== Champion ===

 * Billie Rinaldi (billie at apache dot org) has volunteered to be our Champion

=== Nominated Mentors ===

 * Billie Rinaldi (billie at apache dot org)
 * Benson Margulies (bimargulies at apache dot org)
 * Lewis John McGibbney (lewiscmc at apache dot org)
 * Chris Mattmann (mattmann at apache dot org)

=== Sponsoring Entity ===

 * The Fluo team requests sponsorship from the Incubator PMC

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