incubator-general mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Andrew Purtell <>
Subject Re: [VOTE] Phoenix for incubator project
Date Fri, 06 Dec 2013 01:54:51 GMT
+1 (binding)

On Friday, December 6, 2013, Stack wrote:

> Discussion of the Phoenix proposal has settled since its original
> posting on November 7th.  Feedback has been incorporated.
> Let us now move to a vote.
> Should Phoenix become an Apache incubator project?
> [] +1 Accept Phoenix into the Incubator
> [] +0 Don't care whether or which
> [] -1 Do not accept Phoenix into the Incubator because...
> The latest version of the proposal can be found here [1].  It is
> also posted below for your convenience.
> Let the vote run 72 hours.
> Thank you,
> St.Ack
> 1.
> Abstract
> Phoenix is an open source SQL query engine for Apache HBase, a NoSQL data
> store. It is accessed as a JDBC driver and enables querying and managing
> HBase tables using SQL.
> Proposal
> Phoenix is an open source SQL skin over HBase delivered as a
> client-embedded JDBC driver targeting low latency queries over HBase data.
> Phoenix takes your SQL query, compiles it into a series of HBase scans, and
> orchestrates the running of those scans to produce regular JDBC result
> sets. The table metadata is stored in an HBase table and versioned, such
> that snapshot queries over prior versions will automatically use the
> correct schema. Direct use of the HBase API, along with coprocessors and
> custom filters, results in performance on the order of milliseconds for
> small queries, or seconds for tens of millions of rows. Phoenix interfaces
> with both Pig and Map-reduce for the input and output of data.
> Background
> Phoenix initially started as an internal project at to
> efficiently analyze big data stored in HBase. It was open sourced on Github
> about a year ago in Jan 2013. Over time Phoenix, together with HBase as the
> storage tier, has begun to evolve into a general SQL database with support
> for metadata management, secondary indexes, joins, query optimization, and
> multi-tenancy. This is expected to continue as Phoenix implements a
> cost-based query optimizer and potentially transaction support, and
> surfaces new HBase security features such as encryption and cell-level
> security. Phoenix's developer community has also grown to include
> additional companies such as Intel, who have contributed join support to
> Phoenix, as well as Hortonworks, who are in the process of porting Phoenix
> to the 0.96 release of HBase.
> Rationale
> As usage and the number of contributors to Phoenix has grown, we have
> sought for a long-term home for the project, and we believe the Apache
> foundation would be a great fit. Joining Apache would ensure that tried and
> true processes and procedures are in place for the growing number of
> organizations interested in contributing to Phoenix. Phoenix is also a good
> fit for the Apache foundation: Phoenix already interoperates with several
> existing Apache projects (HBase, Hadoop, Pig, BigTop). The Phoenix team is
> familiar with the Apache process and and believes in the Apache mission -
> the team already includes multiple Apache committers.
> Initial Goals
> The initial goals will be to move the existing codebase to Apache and
> integrate with the Apache development process. Once this is accomplished,
> we plan for incremental development and releases that follow the Apache
> guidelines.
> Current Status
> Phoenix has undergone two major and three minor releases (1.0, 1.1, 1.2,
> 2.0, and 2.1) as well as many patch releases. Phoenix is being used in
> production by as well as at other organizations. The Phoenix
> codebase is currently hosted at, which will form the basis of
> the Apache git repository.
> Meritocracy
> The Phoenix project already operates on meritocratic principles. Phoenix
> has several developers from various organizations outside of
> who have contributed major new features. While this process has remained
> mostly informal, as we do not have an official committer list, an implicit
> organization exists in which individuals who contribute major components
> act as maintainers for those modules. If accepted, the Phoenix project
> would include several of these participants as initial committers. We will
> work to identify all committers and PPMC members for the project and to
> operate under the ASF meritocratic principles.
> Community
> Acceptance into the Apache foundation would bolster the already strong user
> and developer community around Phoenix. That community includes many
> contributors from various other companies, and an active mailing list
> composed of hundreds of users.
> Core Developers
> The core developers of our project are listed in our contributors and
> initial PPMC below. Though many are employed at, there is a
> representative cross sampling of other organizations including Intel,
> Hortonworks, and Cloudera.
> Alignment
> Our proposed Phoenix effort aligns closely with Apache HBase. The HBase
> project perimeter is denoted by a simple byte-array based Create, Read,
> Update, Delete and Scan APIs with no current plans to extend beyond this
> bounds. Phoenix complements this with a higher level API in SQL with which
> many are already familiar. At first glance, it may seem that Phoenix should
> just be folded into HBase as a new module. However, the focus of the two
> projects will be quite different, especially as Phoenix matures. With
> secondary indexing and joins just having been introduced into Phoenix, the
> next big frontier will be to implement a cost-based query optimizer. This
> is the heart-and-soul of most relational databases and can can take a
> lifetime to get right.
> HBase is focused on being a scalable data store agnostic to types and
> schema. Phoenix would layer typing, and relational facilities on top of
> this scalable store. By keeping Apache HBase and Phoenix separate, both may
> evolve independently and at different rates. Though the focus of the two
> projects is different, the relationship between them is very positive and
> mutually beneficial. New features in HBase will be leveraged in Phoenix as
> it makes sense to surface these in a SQL paradigm. In addition, Phoenix may
> drive new features in HBase, as evidenced by the new type system recently
> introduced into HBase. This will enable better interoperability between
> Apache Hive, standalone HBase uses case, and Phoenix by defining a standard
> serialization format.
> Phoenix can be divided into a front end and a back end. The front end is
> delivered as a JDBC driver and contains, among other things, the SQL parser
> and query planner. The front end is currently written for the HBase client
> API but could be extended to support other data stores in the Apache
> family.
> The back end is, currently, HBase specific components for pushing as much
> work to the server as possible. However, if there were sufficient interest
> to build them, contributions to Phoenix of new back ends for other data
> stores in the Apache family would be feasible.
> Other projects exists that perform SQL over HBase data (such as Apache
> Hive), however these products do not provide the same low latency query
> capabilities as Phoenix. Instead, they are more oriented around maximizing
> throughput for batched operations. Phoenix opens the door to a completely
> new set of use cases for Apache HBase that demand a more interactive user
> experience.
> There are also a number of related Apache projects and dependencies that
> are mentioned in the Relationships with Other Apache products section.
> Known Risks
> Orphaned Products
> Given the current level of investment in Phoenix - the risk of the project
> being abandoned is minimal. All current and planned HBase use cases at
> go through Phoenix. In addition, both Intel and Hortonworks
> plan to include Phoenix in their distributions. Other companies have
> devoted significant internal infrastructure investment in Phoenix.
> Inexperience with Open Source
> Phoenix has existed as a healthy open source project for almost a year.
> During that time, James, Mujtaba, and others have successfully fostered an
> open-source community, attracting users and developers from a diverse group
> of companies including Intel, Intuit, Bloomberg, Tagged, and Hortonworks.
> Although neither are committers on other Apache projects, both James and
> Mujtaba have experience working with and contributing to other Apache
> projects.
> Homogenous Developers
> The initial list of committers includes developers from several
> institutions, including Salesforce, Intel, and Hortonworks.
> Reliance on Salaried Developers
> Like most open source projects, Phoenix receives substantial support from
> salaried developers. A large fraction of Phoenix development is supported
> by In addition, those working from within corporations and
> universities often devote “after hours” or spare time to the project. We
> will continue our efforts to ensure stewardship of the project to be
> independent of salaried developers.
> Relationship with Other Apache Products
> Although Phoenix provides a higher level abstraction than Apache HBase by
> hiding its client APIs, Phoenix relies on Apache HBase for both storing and
> retrieving data. It also inter-operates with Apache HBase by allowing
> existing data, not created by Phoenix, to be queried. In addition, both
> Apache Pig and Hadoop are supported for data input and output. Finally, the
> Phoenix is included and installable through Apache Bigtop and the build and
> test suite are run through Apache Maven.
> Phoenix offers an alternative query engine to Apache Hadoop (MapReduce).
> Unlike MapReduce, Phoenix is designed for lower-latency, OLTP, and
> interactive workloads. This makes the projects complimentary as users may
> run MapReduce and Phoenix side-by-side.
> We plan to increase the interoperability between Phoenix, Apache Hive, and
> standalone Apache HBase usage by standardizing on a new type system that
> has been introduced in the current major release of HBase. By all these
> products adopting this new serialization format, interoperability between
> them will take a big step forward.
> In addition, we plan to explore providing lower level APIs for other
> products such as Apache Drill to plug into when querying HBase data so that
> they get the performance benefits of using Phoenix.
> A Excessive Fascination with the Apache Brand
> Phoenix is already a healthy and relatively 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
> Additional documentation on Phoenix may be found on its github website:
> Phoenix overview:
> Phoenix wiki:
> Phoenix road map:
> Phoenix issue tracking:
> Phoenix codebase:
> Phoenix SQL language reference:
> Phoenix performance:
> User group:
> Initial Source
> The Phoenix codebase is currently hosted on Github:
> Source and Intellectual Property Submission Plan
> Currently, the Phoenix codebase is distributed under a BSD license. Upon
> entering Apache, the Phoenix license will be migrated to the Apache 2.0
> License.
> External Dependencies
> Beyond relying on Apache HBase, Phoenix has the following external
> dependencies:
> ANTLR 3.5 (BSD license:
> Sqlline 1.1.2 (BSD license:
> Open CSV 2.3 (Apache 2.0 license)
> Upon acceptance to the incubator, we would begin a thorough analysis of all
> transitive dependencies to verify this information and introduce license
> checking into the build and release process by integrating with Apache Rat.
> Required Resources
> Mailing list
> We will migrate the existing Phoenix mailing lists as follows:
> -->
> -->

Best regards,

   - Andy

Problems worthy of attack prove their worth by hitting back. - Piet Hein
(via Tom White)

  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message