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From Chris Nauroth <>
Subject Re: [VOTE] Accept Omid into the Apache Incubator
Date Wed, 23 Mar 2016 22:34:50 GMT
+1 (binding)

--Chris Nauroth

On 3/23/16, 3:31 PM, "Daniel Dai" <> wrote:

>Following the discussion earlier, I'm calling a vote to accept Omid as
>a new Incubator project.
>[ ] +1 Accept Omid into the Incubator
>[ ] +0 Indifferent to the acceptance of Omid
>[ ] -1 Do not accept Omid because ...
>The vote will be open for the next 72 hours.
>= 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. We¹re 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.
>[2] Omid presentation at Hadoop Summit 2013:
>=== 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, Yahoo¹s 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, Omid¹s new design was largely driven
>by Sieve¹s 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.
>=== 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- don¹t 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 API¹s. For example, Apache Phoenix
>(SQL-on-top-of-HBase) might use Omid as its transaction management
>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, Omid¹s components are generic enough
>to be adapted to any other key-value NoSQL datasource that supports
>* 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
>* 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
>[1] See also Haeinsa:
>=== Current Status ===
>Current Omid implementation is available in both, Yahoo¹s internal
>Github repository for internal use at Yahoo as well as in Yahoo¹s
>Github public repository ( Both
>repositories are managed by Omid¹s 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 Yahoo¹s 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"
>( 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
>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 ====
>Yahoo¹s 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 there¹s 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.) They¹re 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
>Omid¹s Github repository: . It will
>be moved under if the project
>is accepted as an Apache Incubator.
>=== Initial Source ===
>Initial source code is currently hosted in Github for general viewing
>and contribution:
>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
>The code will be moved to Apache 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 ( [Apache 2.0]
>JDK7 or OpenJDK 7 ( [Oracle or Openjdk JDK License]
>Google Guava v11.0.2 ( [Apache 2.0]
>Google Guice v3.0 ( [Apache 2.0]
>Testng v6.8.8  ( [Apache 2.0]
>SLF4J ( v1.7.7 [MIT License]
>Netty ( v3.2.6.Final [Apache 2.0]
>Google Protocol Buffers v2.5.0
>( [BSD License]
>Mockito ( v1.9.5 [MIT License]
>LMAX Disruptor v3.2.0 (
>[Apache 2.0]
>Coda Hale/ Dropwizard Metrics v3.0.1
>( [Apache 2.0]
>C.Beust, JCommander v1.35 ( [Apache 2.0]
>Hamcrest v1.3 ( [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 ====
>==== Documentation ====
>==== JIRA instance ====
>=== 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
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