That'd be great to allow different transaction frameworks to plug into
Phoenix. I suspect that transactions are in the same boat as secondary
indexing with a one-size-fits-all approach not being feasible across the
variety of use cases we see. Having a pluggable mechanism would be a good
solution. I've filed PHOENIX-2788 [1] for this work. Though, of course it
helps that a transaction layer works with HBase, much of the integration
work is at the Phoenix level. To get an idea, see [2]. There are several
features missing in HBase that would be precursors to HBASE-11447 IMHO.
Namely support for undo of a Delete [3] and finer timestamp granularity for
Cells [4].
James
[1] https://issues.apache.org/jira/browse/PHOENIX-2788
[2] https://github.com/apache/phoenix/pull/133
[3] https://issues.apache.org/jira/browse/HBASE-11292
[4] https://issues.apache.org/jira/browse/HBASE-8927
On Mon, Mar 21, 2016 at 12:48 PM, Henry Saputra <henry.sapu...@gmail.com>
wrote:
> Hi Pierre,
>
> Thanks for your reply. Yes, I remember Trafodion, but since it is more
> complete solution of SQL + Transaction, I did not mention it as
> comparisons.
>
> But the comment is valid, meaning there were already prior acts about
> Transaction support for NoSQL in Apache, so no reason to "reject" or as
> immediate consolidation of such projects into incubator.
>
>
> - Henry
>
> On Sun, Mar 20, 2016 at 1:34 PM, Pierre Smits <pierre.sm...@gmail.com>
> wrote:
>
> > Hi Henry,
> >
> > It seems you (and several others) are forgetting the Trafodion, which
> also
> > privides transactions on N*SQL solutions, see http trafodion.apache.org
> >
> > Best regards,
> >
> > Pierre Smits
> >
> > ORRTIZ.COM <http://www.orrtiz.com>
> > OFBiz based solutions & services
> >
> > OFBiz Extensions Marketplace
> > http://oem.ofbizci.net/oci-2/
> >
> > On Sat, Mar 19, 2016 at 12:19 AM, Henry Saputra <henry.sapu...@gmail.com
> >
> > wrote:
> >
> > > I know Apache incubator does not play favorite but it is getting
> awkward
> > > that TWO transaction engine for HBase coming to incubator at the same
> > time.
> > >
> > > As most people know, the other one is Tephra, that just coming to
> > incubator
> > > few weeks ago.
> > >
> > > As member of IPMC, I would like to see Omid provide some more details
> > > comparisons about the difference that the project bring, in term of
> > > approach and possible integrations with other ASF projects.
> > >
> > > If possible, I would prefer to see Omid team work together with Tephra
> to
> > > work on working together to make one solid transaction engine for HBase
> > and
> > > later NoSQL databases.
> > >
> > >
> > > - Henry
> > >
> > > On Thu, Mar 17, 2016 at 1:17 PM, Daniel Dai <dai...@gmail.com> wrote:
> > >
> > > > Hi,
> > > >
> > > > I would like to propose Omid as an Apache Incubator project:
> > > >
> > > > https://wiki.apache.org/incubator/OmidProposal
> > > >
> > > > I've posted posted the text of the proposal below:
> > > >
> > > > Thanks,
> > > > Daniel
> > > >
> > > > = Omid Proposal =
> > > >
> > > > === Abstract ===
> > > >
> > > > Omid is a flexible, reliable, high performant and scalable ACID
> > > > transactional framework that allows client applications to execute
> > > > transactions on top of MVCC key/value-based NoSQL datastores
> > > > (currently Apache HBase) providing Snapshot Isolation guarantees on
> > > > the accessed data.
> > > >
> > > >
> > > > === Proposal ===
> > > >
> > > > Omid is a flexible open-source transactional framework that provides
> > > > ACID transactions with Snapshot Isolation guarantees on top of NoSQL
> > > > datastores. In particular, the current codebase brings the concept of
> > > > transactions to the popular Apache HBase datastore. Omid offers great
> > > > performance, it is highly available, and scalable. Omid's current
> > > > version is able to scale to thousands of clients triggering
> concurrent
> > > > transactions on application data stored in HBase. Omid can scale
> > > > beyond 100K transactions per second on mid-range hardware while
> > > > incurring in a minimal impact on the speed of data access in the
> > > > datastore. We’re currently experimenting with a prototype version
> that
> > > > can improve the performance up to ~380K TPS.
> > > >
> > > >
> > > > Omid has been publicly available as an open-source project in Github
> > > > under Apache License Version 2.0 since 2011 [1]. During these years,
> > > > it has generated certain interest in the open source community,
> > > > especially since the public presentation of the first version in
> > > > Hadoop Summit 2013 [2]. Currently the Github project has 241 Stars
> and
> > > > 93 forks. Yahoo Inc. submits this proposal to the Apache Software
> > > > Foundation with the aim to transfer the Omid project -including its
> > > > source code and documentation- to Apache in order to start the build
> > > > of a stable open source community around it.
> > > >
> > > >
> > > > [1] https://github.com/yahoo/omid
> > > >
> > > > [2] Omid presentation at Hadoop Summit 2013:
> > > >
> > > >
> > >
> >
> https://www.youtube.com/watch?v=Rhdmo9pVGgU&index=68&list=PLSAiKuajRe2luyqLU464Nxz4aQe7EPBus
> > > >
> > > >
> > > > === Background ===
> > > >
> > > > An Omid prototype was first released as an open-source project back
> in
> > > > 2011. Inspired by Google Percolator [1], it offered a lock-free
> > > > approach to transactions in NoSQL datastores (See [2]). However,
> > > > during these years, the design of Omid has evolved significantly.
> > > > Whilst the current open-sourced version maintains many aspects of the
> > > > original implementation, it is the result of a major redesign of the
> > > > first prototype released in 2011.
> > > >
> > > >
> > > > Omid has now a more decentralized design that does not sacrifice the
> > > > consistency and performance of the original version. The current
> > > > design also enables Omid to scale to thousands of clients executing
> > > > transactions concurrently on application data stored in HBase.
> > > > Internally, Omid still utilizes a lock-free approach to support
> > > > multiple concurrent clients. Its design also relies on a centralized
> > > > conflict detection component, the TSO, which now resolves in an
> > > > efficient manner writeset collisions among concurrent transactions
> > > > without having to piggyback commit information to the clients.
> Another
> > > > important benefit of Omid is that it doesn't require any modification
> > > > of the underlying key-value datastore, HBase in this case. Moreover,
> > > > the recently added high availability algorithm allows to eliminate
> the
> > > > single point of failure represented by the TSO in those system
> > > > deployments requiring a higher degree of dependability. Last but not
> > > > least, the provided user API is very simple, mimicking transaction
> > > > managers in the relational world: begin, commit, rollback.
> > > >
> > > >
> > > > Omid is used internally at Yahoo. Sieve, Yahoo’s web-scale content
> > > > management platform powering some of next-generation search and
> > > > personalization products is using Omid as a transaction manager in
> its
> > > > processing pipeline. Sieve essentially acts as a huge processing hub
> > > > between content feeds and serving systems. It provides an environment
> > > > for highly customizable, real-time, streamed information processing,
> > > > with typical discovery-to-service latencies of just a few seconds. In
> > > > terms of scale and availability, Omid’s new design was largely driven
> > > > by Sieve’s requirements.
> > > >
> > > >
> > > > At Yahoo, we are also making an effort to disseminate the current
> > > > status of the project through blog entries (See [3], [4] and [5]) and
> > > > submissions to technical and academic conferences such as ATC 2016,
> > > > Hadoop Summit 2016, HBaseConf 2016. Last but not least, Omid also
> > > > appeared in a TechCrunch article in the last quarter of 2015 (See
> [6])
> > > >
> > > >
> > > > [1] D. Peng and F. Dabek, Large-scale Incremental Processing Using
> > > > Distributed Transactions and Notifications. USENIX Symposium on
> > > > Operating Systems Design and Implementation, 2010
> > > >
> > > > [2] D. Gomez-Ferro, F. Junqueira, I. Kelly, B. Reed, and M. Yabandeh.
> > > > Omid: Lock-free transactional support for distributed data stores. In
> > > > Proc. of ICDE, 2013.
> > > >
> > > > [3]
> > > >
> > >
> >
> http://yahoohadoop.tumblr.com/post/129089878751/introducing-omid-transaction-processing-for
> > > >
> > > > [4]
> > > >
> > >
> >
> http://yahoohadoop.tumblr.com/post/132695603476/omid-architecture-and-protocol
> > > >
> > > > [5]
> > > >
> > >
> >
> http://yahoohadoop.tumblr.com/post/138682361161/high-availability-in-omid
> > > >
> > > > [6]
> > > >
> > >
> >
> http://techcrunch.com/2015/10/01/yahoos-open-source-omid-project-brings-scalable-transaction-processing-to-hbase/
> > > >
> > > >
> > > > === Rationale ===
> > > >
> > > > Programming with ACID (Atomicity, Consistency, Isolation, Durability)
> > > > transactions is very popular and it is featured in relational
> > > > databases. However, in the Big Data ecosystem, applications typically
> > > > use NoSQL datastores, which do not provide ACID transactions. Such
> > > > NoSQL datastores used to give up transactional support for greater
> > > > agility and scalability. However, while early NoSQL data store
> > > > implementations did not include transaction support, the need for
> > > > transactions soon emerged in Big Data applications when accessing
> > > > shared data; for example, transactions are very important for
> > > > modern, scalable systems that process content incrementally.
> > > >
> > > >
> > > > NoSQL datastores -including HBase- don’t provide transactional
> > > > frameworks to coordinate the access to the underlying data for
> > > > preserving consistency. By using Omid, Big Data applications that
> need
> > > > to bundle multiple read and write operations on HBase into logically
> > > > indivisible units of work can execute transactions with ACID
> > > > properties, just as they would use transactions in the relational
> > > > database world. Omid extends the HBase key-value access APl with
> > > > transaction semantics. It can be exercised either directly, or via
> > > > higher level data management API’s. For example, Apache Phoenix
> > > > (SQL-on-top-of-HBase) might use Omid as its transaction management
> > > > component.
> > > >
> > > >
> > > > The following features make Omid an attractive choice for system
> > > > designers and other projects in the Apache community:
> > > >
> > > >
> > > > * Semantics. Omid implements Snapshot Isolation (SI,) supported by
> > > > major SQL and NoSQL technologies (e.g. Google Percolator).
> > > >
> > > >
> > > > * Performance and Scalability. Omid provides a highly scalable,
> > > > lock-free implementation of SI. To the best of our knowledge, it is
> > > > also one of the few open source NoSQL transactional platforms that
> can
> > > > execute more than 100K transactions per second [1]. A new prototype
> > > > still in development can go even further, up to ~380K TPS.
> > > >
> > > >
> > > > * Reliability. Omid has a high-availability (HA) mode, in which the
> > > > core service performing writeset conflict resolution operates as
> > > > primary-backup process pair with automatic failover. The HA support
> > > > has zero overhead on the mainstream operation.
> > > >
> > > >
> > > > * Adaptability. Omid current version provides transactions on data
> > > > stored in Apache HBase. However, Omid’s components are generic enough
> > > > to be adapted to any other key-value NoSQL datasource that supports
> > > > MVCC.
> > > >
> > > >
> > > > * Development. Omid provides a very simple interface that mimics
> > > > standard HBase APIs, making it developer friendly. Only minimal
> > > > extensions to the standard interfaces have been introduced to enable
> > > > transactions.
> > > >
> > > >
> > > > * Simplicity. Omid leverages the HBase infrastructure for managing
> its
> > > > own metadata. It entails no additional services apart from those
> > > > provided and used by HBase.
> > > >
> > > >
> > > > * Track Record. As we have mentioned, Omid is already in use by
> > > > very-large-scale production systems at Yahoo. Also, Hortonworks is
> > > > integrating Omid in a metastore implementation for Hive based on
> > > > HBase.
> > > >
> > > > [1] See also Haeinsa:
> https://github.com/vcnc/haeinsa/wiki/Performance
> > > >
> > > >
> > > > === Current Status ===
> > > > Current Omid implementation is available in both, Yahoo’s internal
> > > > Github repository for internal use at Yahoo as well as in Yahoo’s
> > > > Github public repository (https://github.com/yahoo/omid.git). Both
> > > > repositories are managed by Omid’s current developers at Yahoo.
> > > >
> > > > As it is mentioned above, Yahoo is currently using Omid for providing
> > > > transactions in Sieve, a web-scale content management platform that
> > > > powers Yahoo’s next-generation search and personalization products.
> > > >
> > > >
> > > > ==== Meritocracy ====
> > > > The first version of Omid was originally created in 2011 by Maysam
> > > > Yabandeh, Daniel Gomez-Ferro, Ivan B. Kelly, Benjamin Reed and Flavio
> > > > Junqueira at the R&D Scalable Computing Group of Yahoo Labs in Spain.
> > > >
> > > >
> > > > During the years after its inception, Omid has matured to operate at
> > > > Web scale and has been used internally by strategic projects at Yahoo
> > > > such as Sieve. The current base of committers belong to the Yahoo
> team
> > > > that took over the initial Omid prototype and rewrote it to meet the
> > > > high availability and scalability requirements of the Sieve project.
> > > > This base of committers has recently incorporated Hortonworks members
> > > > that helped in the Omid adaptation to HBase 1.x versions.
> > > >
> > > >
> > > > With this initial committer base, we aim to form a larger community
> > > > that can collaborate with new ideas over the current code base. This
> > > > new community will run the project following the "Apache Way"
> > > > (http://apache.org/foundation/governance/). Users and new
> contributors
> > > > will be treated with respect and welcomed. To grow the community, we
> > > > will encourage contributors to provide patches, review code, propose
> > > > new features improvements, talk at conferences such as Hadoop Summit,
> > > > HBaseCon, ApacheCon, etc. Committership and PMC membership will be
> > > > offered according to meritocracy.
> > > >
> > > > ==== Community ====
> > > >
> > > > The public Yahoo Omid repository at Github currently has 241 Stars
> and
> > > > 93 forks, which means that there is an important interest for the
> > > > project in the open-source community, at least compared with other
> > > > similar projects (See https://github.com/yahoo/omid.git).
> > > >
> > > >
> > > > Recently, Hortonworks contributors to the Apache Hive project which
> > > > are working on storing Hive metadata in HBase (Apache Jira HIVE-9452)
> > > > manifested interest in using Omid. We started with them a fruitful
> > > > collaboration that resulted in Omid supporting HBase 1.x versions.
> > > >
> > > >
> > > > Salesforce is also interested in collaborating in doing a Proof of
> > > > Concept for integrating Omid as a pluggable transaction manager in
> > > > Apache Phoenix.
> > > >
> > > >
> > > > Yahoo, Hortonworks and Salesforce participants will constitute the
> > > > initial set of committers and mentors for the proposal.
> > > >
> > > > ==== Core Developers ====
> > > > The core developers of Omid are all skilled software developers and
> > > > research engineers at Yahoo Inc. and Hortonworks with years of
> > > > experiences in their fields. At this moment, developers are
> > > > distributed across U.S. and Israel. The aim is to incorporate more
> > > > committers from different organizations and locations over time.
> > > >
> > > >
> > > > The current set of developers include experienced committers from
> > > > Apache HBase, Hive and Hadoop projects that have been working with us
> > > > in the current codebase found in Github.
> > > >
> > > > Finally, some of the core developers are currently NOT affiliated
> with
> > > > the ASF and would require new ICLAs to be filed.
> > > >
> > > >
> > > > === Alignment ===
> > > > Omid enhances with transactions the already successful Apache HBase
> > > > datastore project. We have collaborated with other developers inside
> > > > and outside Yahoo which are involved in the Apache HBase community,
> so
> > > > we have had reliable feedback from them.
> > > >
> > > > Although Omid brings value into HBase, the design of the current
> > > > version provides a general transaction scheme that can potentially be
> > > > adapted to other MVCC key-value datastores such as Apache Cassandra.
> > > >
> > > >
> > > > Apache Phoenix is also a potential target. Phoenix is a SQL layer on
> > > > top of HBase that can potentially integrate Omid in order to provide
> > > > the well-know concept of transactions to Phoenix-based applications.
> > > >
> > > >
> > > > === Known Risks ===
> > > > ==== Orphaned products ====
> > > > Yahoo’s Research and Search organizations have been taking care of
> > > > Omid development since the first prototype creation in 2011. Yahoo
> has
> > > > a long history participating in open-source projects, and has been
> > > > also a long time contributor to the Apache community. For example, in
> > > > Apache, Yahoo is an important contributor in many projects in the
> > > > Hadoop ecosystem such as HBase, Pig, Storm or YARN, and has also
> > > > open-sourced other well-known projects outside Hadoop, such as
> > > > Zookeeper or Bookkeeper. So it is in the best interest of Yahoo make
> > > > Omid also a successful open-source Apache product. If this happens,
> we
> > > > are sure that a larger community will be formed around the project in
> > > > a relatively short period of time, contributing to the
> diversification
> > > > and stabilization of the base of committers.
> > > >
> > > >
> > > > ==== Inexperience with Open Source ====
> > > > This project has long standing experienced mentors and interested
> > > > contributors from Apache HBase, Hive and Phoenix to help us moving
> > > > through the open source process. We are actively working with
> > > > experienced Apache community members to improve our project and
> > > > further testing.
> > > >
> > > > ==== Homogeneous Developers ====
> > > > Omid has been supported by Yahoo since its inception in 2011.
> However,
> > > > all current committers are employed by their respective companies
> > > > shown in the Affiliations section.
> > > >
> > > >
> > > > ==== Reliance on Salaried Developers ====
> > > >
> > > > All the current developers are paid by their employers to contribute
> > > > to this project. Yahoo developers will also continuing maintaining
> the
> > > > internal Omid repository at their company.
> > > >
> > > > Of course, other developers are welcomed to contribute to this
> project
> > > > after it is open sourced in Apache.
> > > >
> > > > ==== Relationships with Other Apache Product ====
> > > >
> > > > Current Omid incarnation serves transactional contexts to
> applications
> > > > storing their data in HBase. However Omid design potentially allows
> to
> > > > be adapted to serve transactions on top of other MVCC-based key-value
> > > > datastores in Apache community such as Cassandra.
> > > >
> > > >
> > > > As a transactional framework, many other Apache projects such as
> > > > Apache Spark, Apache Phoenix, Apache Storm, Apache Flink could
> > > > potentially benefit from Omid to get transactional contexts. In
> > > > particular, Apache Phoenix -a SQL layer on top of HBase- might use
> > > > Omid as its transaction management component. Once we open source
> Omid
> > > > as an Apache project, we expect to generate more interest in the
> > > > surrounded communities.
> > > >
> > > >
> > > > Very recently, a new incubator proposal for a similar project called
> > > > Tephra, has been submitted to the ASF. We think this is good for the
> > > > Apache community, and we believe that there’s room for both proposals
> > > > as the design of each of them is based on different principles (e.g.
> > > > Omid does not require to maintain the state of ongoing transactions
> on
> > > > the server-side component) and due to the fact that both -Tephra and
> > > > Omid- have also gained certain traction in the open-source community.
> > > >
> > > >
> > > > With regard to the Apache projects that Omid uses, apart from HBase,
> > > > Omid relies on Apache Zookeeper and Curator projects in order to
> > > > coordinate the (re)connection of transaction managers (acting as
> > > > clients) to the conflict resolution component for transactions
> (server
> > > > side.) They’re also used in order to coordinate the master and backup
> > > > replicas in high availability scenarios.
> > > >
> > > >
> > > > ==== An Excessive Fascination with the Apache Brand ====
> > > >
> > > > We are applying to the Incubator process because we think that it is
> > > > the logical next step for the Omid project after we open-sourced the
> > > > code in Github some years ago. Yahoo has a long-standing history of
> > > > contributing to Apache projects. The developers and contributors
> > > > understand the implications of making it an Apache project, and
> > > > strongly believe that the growing community can benefit from the
> > > > Apache environment, ecosystem, and infrastrastructure.
> > > >
> > > >
> > > > === Documentation ===
> > > > Current documentation about the project is available in the wiki of
> > > > Omid’s Github repository: https://github.com/yahoo/omid/wiki . It
> will
> > > > be moved under https://omid.incubator.apache.org/docs if the project
> > > > is accepted as an Apache Incubator.
> > > >
> > > > === Initial Source ===
> > > > Initial source code is currently hosted in Github for general viewing
> > > > and contribution:
> > > >
> > > > https://github.com/yahoo/omid.git
> > > >
> > > >
> > > > Omid source code is written in Java code (99%) mixed with some shell
> > > > script (1%) in order to configure and trigger the execution of main
> > > > components.
> > > >
> > > >
> > > > The code will be moved to Apache http://git.apache.org/ if accepted
> as
> > > > an Incubator project.
> > > >
> > > > === Source and Intellectual Property Submission Plan ===
> > > >
> > > > The current Omid License for the code published in Github is Apache
> > > > 2.0. If Omid fulfills and passes the conditions for being an
> Incubator
> > > > project in the ASF, the source code will be transitioned via the
> > > > Software Grant Agreement onto the ASF infrastructure and in turn made
> > > > available under the Apache License, version 2.0.
> > > >
> > > > === External Dependencies ===
> > > >
> > > >
> > > > The required external dependencies that are not Apache projects are
> > > > all Apache licenses or other compatible Licenses:
> > > >
> > > > Maven & Maven plugins (http://maven.apache.org/) [Apache 2.0]
> > > >
> > > > JDK7 or OpenJDK 7 (http://java.com/) [Oracle or Openjdk JDK License]
> > > >
> > > > Google Guava v11.0.2 (https://github.com/google/guava) [Apache 2.0]
> > > >
> > > > Google Guice v3.0 (https://github.com/google/guice/wiki) [Apache
> 2.0]
> > > >
> > > > Testng v6.8.8 (http://testng.org) [Apache 2.0]
> > > >
> > > > SLF4J (http://www.slf4j.org/) v1.7.7 [MIT License]
> > > >
> > > > Netty (http://netty.io) v3.2.6.Final [Apache 2.0]
> > > >
> > > > Google Protocol Buffers v2.5.0
> > > > (https://developers.google.com/protocol-buffers/) [BSD License]
> > > >
> > > > Mockito (http://mockito.org/) v1.9.5 [MIT License]
> > > >
> > > > LMAX Disruptor v3.2.0 (https://lmax-exchange.github.io/disruptor/)
> > > > [Apache 2.0]
> > > >
> > > > Coda Hale/Yammer.com Dropwizard Metrics v3.0.1
> > > > (http://metrics.dropwizard.io/3.1.0/) [Apache 2.0]
> > > >
> > > > C.Beust, JCommander v1.35 (http://jcommander.org/) [Apache 2.0]
> > > >
> > > > Hamcrest v1.3 (http://hamcrest.org/JavaHamcrest/) [BSD License]
> > > >
> > > >
> > > > === Cryptography ===
> > > > Omid project does not use cryptography itself. However, Apache HBase
> > > > -the datastore on top of which Omid works in its current version-
> uses
> > > > standard APIs and tools for SSH and SSL communication where
> necessary.
> > > >
> > > > === Required Resources ===
> > > > We request that following resources be created for the project to
> use:
> > > >
> > > > ==== Mailing lists ====
> > > >
> > > > omid-private (moderated subscriptions)
> > > >
> > > > omid-commits (commit notification)
> > > > omid-dev (technical discussions)
> > > >
> > > > ==== Git repository ====
> > > > https://github.com/apache/incubator-omid
> > > >
> > > > ==== Documentation ====
> > > > https://omid.incubator.apache.org/docs/
> > > >
> > > > ==== JIRA instance ====
> > > > https://issues.apache.org/jira/browse/omid
> > > >
> > > > === Initial Committers ===
> > > >
> > > > * Daniel Dai, Hortonworks (daijy<AT>hortonworks<DOT>com)
> > > >
> > > >
> > > > * Alan Gates, Hortonworks, (gates<AT>hortonworks<DOT>com)
> > > >
> > > >
> > > > * Lars Hofhansl, Salesforce (larsh<AT>apache<DOT>org)
> > > >
> > > >
> > > > * Flavio P. Junqueira, Confluent (fpj<AT>apache<DOT>org)
> > > >
> > > >
> > > > * Igor Katkov (katkovi<AT>yahoo-inc<DOT>com)
> > > >
> > > >
> > > > * Francis C. Liu (fcliu<AT>yahoo-inc<DOT>com)
> > > >
> > > > * Thejas Nair, Hortonworks (thejas<AT>hortonworks<DOT>com)
> > > >
> > > >
> > > > * Francisco Perez-Sorrosal (fperez<AT>yahoo-inc<DOT>com)
> > > >
> > > >
> > > > * Sameer Paranjpye (sparanjpye<AT>yahoo<DOT>com)
> > > >
> > > >
> > > > * Ohad Shacham (ohads<AT>yahoo-inc<DOT>com)
> > > >
> > > > * James Taylor, Salesforce (jamestaylor<AT>apache<DOT>org>)
> > > >
> > > >
> > > > === Additional Interested Contributors ===
> > > > * Ivan Kelly (ivank<AT>apache<DOT>org)
> > > >
> > > > * Maysam Yabandeh (myabandeh<AT>dropbox<DOT>com)
> > > >
> > > >
> > > > === Affiliations ===
> > > >
> > > > * Edward Bortnikov, Yahoo Inc.
> > > >
> > > >
> > > > * Daniel Dai, Hortonworks
> > > >
> > > >
> > > > * Flavio P. Junqueira, Confluent
> > > >
> > > >
> > > > * Igor Katkov, Yahoo Inc.
> > > >
> > > >
> > > > * Ivan Kelly, Midokura
> > > >
> > > >
> > > > * Francis C. Liu, Yahoo Inc.
> > > >
> > > >
> > > > * Sameer Paranjpye, Arimo
> > > >
> > > > * Francisco Perez-Sorrosal, Yahoo Inc.
> > > >
> > > >
> > > > * Ohad Shacham, Yahoo Inc.
> > > >
> > > >
> > > > * Maysam Yabandeh, Dropbox Inc.
> > > >
> > > >
> > > > === Sponsors ===
> > > >
> > > > ==== Champion ====
> > > >
> > > > Daniel Dai, Hortonworks (daijy<AT>hortonworks<DOT>com)
> > > >
> > > > ==== Nominated Mentors ====
> > > >
> > > > Alan Gates, Hortonworks, (gates<AT>hortonworks<DOT>com)
> > > >
> > > > Lars Hofhansl, Salesforce (larsh<AT>apache<DOT>org)
> > > >
> > > > Flavio P. Junqueira, Confluent (fpj<AT>apache<DOT>org)
> > > >
> > > > Thejas Nair, Hortonworks (thejas<AT>hortonworks<DOT>com)
> > > >
> > > > James Taylor, Salesforce (jamestaylor<AT>apache<DOT>org>)
> > > >
> > > >
> > > > ==== Sponsoring Entity ====
> > > > Apache Incubator PMC
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: general-unsubscr...@incubator.apache.org
> > > > For additional commands, e-mail: general-h...@incubator.apache.org
> > > >
> > > >
> > >
> >
>
