+1 (binding) -C On Wed, Oct 10, 2012 at 9:37 AM, kishore g <g.kish...@gmail.com> wrote: > Hi, > > I would like to call a vote for accepting Helix for incubation in the > Apache Incubator. I have pasted the full proposal below. > > Please cast your vote: > > [ ] +1, bring Helix into Incubator > [ ] +0, I don't care either way, > [ ] -1, do not bring Helix into Incubator, because ... > > This vote will be open for 72 hours and only votes from the Incubator > PMC are binding. > > Thanks, > Kishore G > > > == Abstract == > Helix is a cluster management system for managing partitioned and > replicated resources in distributed data systems. > > == Proposal == > Helix provides an abstraction that separates coordination and > management tasks from functional tasks of a distributed system. The > developer defines the system behavior via a state machine, the > transitions between those states, and constraints on states and > transitions that govern the system’s valid settings. Helix ensures the > distributed system satisfies the state machine, controlling state > changes as appropriate during common operational activities such as > upgrades, component failures, bootstrapping, running maintenance > tasks, and adding capacity. > > == Background == > Helix was developed at LinkedIn to manage large clusters for several > diverse applications, including a distributed, partitioned, > replicated, highly available document store with a master-slave model, > a search service with multiple replicas that are updated atomically > and in near real-time, and a change data capture service for reliably > transporting database changes to caches, other dependent databases and > indexes. > > These services use Helix to reliably manage dozens of clusters in > multiple data centers. These services meet stringent SLAs at large > scale for mission-critical production applications such as search, > social gestures, and profiles. > Helix has proven to be flexible for a wide variety of system > configurations and operational patterns, is easy to integrate, with > pluggable interfaces enabling custom behavior. It depends on Apache > Zookeeper for coordination and tracking of system state across the > cluster, as well as providing fault tolerance. > Helix is written in Java. It was developed internally at LinkedIn to > meet our particular use cases, but will be useful to many > organizations facing a similar need to manage large clusters. > Therefore, we would like to share it the ASF and begin developing a > community of developers and users within Apache. > > == Rationale == > Many organizations can benefit from a generalized cluster management > system such as Helix. While our distributed data systems use-cases for > a very large website like LinkedIn has driven the design of Helix, its > uses are varied and we expect many new use cases to emerge. > > == Current Status == > === Meritocracy === > Our intent with this incubator proposal is to start building a diverse > developer community around Helix following the Apache meritocracy > model. Since Helix was initially developed in late 2011, we have had > fast adoption and contributions by multiple teams at LinkedIn. > We plan to continue support for new contributors and work with those > who contribute significantly to the project to make them committers. > > === Community === > Helix is currently being used internally at LinkedIn and is in > production in that company for customer-facing features. Recent public > presentations of Helix and its goals garnered much interest from > potential contributors. We hope to extend our contributor base > significantly and invite all those who are interested in building > large-scale distributed systems to participate. > To further this goal, we use GitHub issue tracking and branching facilities. > > === Core Developers === > Helix is currently being developed by three engineers at LinkedIn: > Kishore Gopalakrishna, Shi Lu and Jason Zheng, and Adam Silberstein, > an engineer at Trifacta. Kishore, the lead developer and architect, > has experience within Apache as an S4 committer. Shi developed the > partition to node mapping and rebalancing algorithm, cluster admin > APIs, and the health check framework. Jason developed the cluster > controller and most of the test framework. Adam developed the rich > alerting framework that enables cluster-wide, “intelligent“ alerts. > > === Alignment === > The ASF is the natural choice to host the Helix project as its goal of > encouraging community-driven open-source projects fits with our vision > for Helix. Many projects that can benefit from Helix will rely on > Apache ZooKeeper for cluster state management, and can far more easily > achieve their operational goals by using Helix. > > == Known Risks == > === Orphaned Products === > The core developers plan to work full time on the project. There is > very little risk of Helix being abandoned as it is a critical part of > LinkedIn's internal infrastructure and is in production use. > > === Inexperience with Open Source === > Only one of the core developers has experience with open source > development. Kishore has been actively involved with the ASF as a > committer and lead developer of S4. > > === Homogeneous Developers === > The current core developers are all from LinkedIn. However, we hope to > establish a developer community that includes contributors from > several corporations and we are actively encouraging new contributors > via the mailing lists and public presentations of Helix. > > === Reliance on Salaried Developers === > Currently, the developers are paid to do work on Helix. However, once > the project has a community built around it, we expect to get > committers, developers and community from outside the current core > developers. However, because LinkedIn relies on Helix internally, the > reliance on salaried developers is unlikely to change. > > === Relationships with Other Apache Products === > Helix uses Apache ZooKeeper to coordinate its state amongst the > managed cluster components and for leader election to provide fault > tolerance, and uses Apache Maven for build management. > > === An Excessive Fascination with the Apache Brand === > While we respect the reputation of the Apache brand and have no doubts > that it will attract contributors and users, our interest is primarily > to give Helix a solid home as an open source project following an > established development model. We have also given reasons in the > Rationale and Alignment sections. > > == Documentation == > Information about Helix can be found at > [https://github.com/linkedin/helix/wiki]. The following links provide > more information about the project: > > * Home Page: http://linkedin.github.com/helix/ > * Github source: https://github.com/linkedin/helix > * Documentation: https://github.com/linkedin/helix/wiki > * Javadocs: http://linkedin.github.com/helix/apidocs/ > > == Initial Source == > Helix has been under development at LinkedIn since April 2011. It is > currently hosted on github under the Apache license 2 at > [https://github.com/linkedin/helix] > Helix is written in Java. Its source tree is entirely self-contained > and relies on Maven as its build system and dependency resolution > mechanism. > > == External Dependencies == > The dependencies all have Apache compatible licenses. > * log4j > * zookeeper > * xstream > * jackson-core-asl > * jackson-mapper-asl > * commons-io > * commons-cli > * commons-math > * zkclient > * camel-josql > * camel-core > * gentlyweb-utils > * josql > * commons-management > * commons-logging-api > * org.restlet > * com.noelios.restlet > * net.sf.jsqlparser > > Non-Apache build tools that are used by Helix are as follows: > * Cobertura: GNU GPLv2 > Note that Cobertura is optional and is only used for calculating unit > test coverage. > > > == Cryptography == > Not applicable. > > == Required Resources == > === Mailing Lists === > * helix-private for private PMC discussions (with moderated subscriptions) > * helix-dev > * helix-commits > * helix-user > > === Git Directory === > Since Git is now available to be used as primary repo type, Helix > would be available in the git repository instead of svn. > [https://git.apache.org/helix.git] > > === Issue Tracking === > JIRA Helix (HELIX) > > === Other Resources === > The existing code already has unit and integration tests, so we would > like a Jenkins instance to run them whenever a new patch is submitted. > This can be added after project creation. > > == Initial Committers == > * Kishore Gopalakrishna > * Shi Lu > * Zhen Zheng > * Adam Silberstein > * Kapil Surlaker > * Bob Schulman > * Swaroop Jagadish > * Rahul Aggarwal > * Terence Yim > * Santiago Perez > > > == Affiliations == > * Kishore Gopalakrishna (LinkedIn) > * Shi Lu (LinkedIn) > * Jason Zheng (LinkedIn) > * Adam Silberstein (Trifacta) > * Kapil Surlaker (LinkedIn) > * Bob Schulman (LinkedIn) > * Swaroop Jagadish (LinkedIn) > * Rahul Aggarwal (LinkedIn) > * Terence Yim (LinkedIn) > * Santiago Perez (LinkedIn) > > == Sponsors == > === Champion === > * Patrick Hunt (Apache Member) > > === Nominated Mentors === > * Patrick Hunt (Apache Member) > * Mahadev Konar (Apache Member) > * Owen O'Malley (Apache Member) > > === Sponsoring Entity === > We are requesting the Incubator to sponsor this project. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: general-unsubscr...@incubator.apache.org > For additional commands, e-mail: general-h...@incubator.apache.org >
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