+1
From: Sijie Guo <si...@apache.org> > Date: Mon, Jun 20, 2016 at 10:11 PM > Subject: [VOTE] Accept DistributedLog into the Apache Incubator > To: general@incubator.apache.org > > > Hello All, > > Following the discussion thread, I would like to call a VOTE on accepting > DistributedLog into the Apache Incubator. > > [] +1 Accept DistributedLog into the Apache Incubator > [] +0 Abstain. > [] -1 Do not accept DistributedLog into the Apache Incubator because ... > > This vote will be open for at least 72 hours. > > The proposal follows, you can also access the wiki page: > https://wiki.apache.org/incubator/DistributedLogProposal > > Here is my +1. > > Thanks, > Sijie > > = Abstract = > DistributedLog is a high-performance replicated log service. It offers > durability, replication and strong consistency, which provides a > fundamental building block for building reliable distributed systems, e.g > replicated-state-machines, general pub/sub systems, distributed databases, > distributed queues and etc. > > See “Building Distributedlog - Twitter’s high performance replicated log > service” for details: > https://blog.twitter.com/2015/building-distributedlog-twitter-s-high-performance-replicated-log-service > > = Proposal = > We propose to contribute DistributedLog codebase and associated artifacts > (e.g. documentation, web-site content etc.) to the Apache Software > Foundation with the intent of forming a productive, meritocratic and open > community around DistributedLog’s continued development, according to the > ‘Apache Way’. > > = Background = > Engineers at Twitter began developing DistributedLog in early 2013. > DistributedLog is described in a Twitter engineering blog post and > presented at the Messaging Meetup in Sep 2015. It has been released as an > Apache-licensed open-source project on GitHub in May 2016. > > DistributedLog is a high-performance replicated log service, which > provides simple stream-oriented abstractions over log-segments and offers > durability, replication and strong consistency for building reliable > distributed systems. The features offered by DistributedLog includes: > > * Simple high-level, stream oriented interface > * Naming and metadata scheme for managing streams and other entities > * Log data management policies, include data segmentation and data > retention > * Fast write pipeline leveraging batching and compression > * Fast read mechanism leveraging long-poll and read-ahead caching > * Service tiers supporting writer fan-in and reader fan-out > * Geo-replicated logs > > DistributedLog’s most important benefit is high-performance with a strong > durability guarantee, making it extremely appropriate for running different > workloads from distributed database journaling to real-time stream > computing. Its modern, layered architecture makes it easy to run the > service tiers in multi-tenant datacenter environments such as Apache Mesos > or cloud environments such as EC2. > > = Rationale = > DistributedLog is designed to provide core fundamental features like > high-performance, durability and strong consistency to anyone who is > building reliable distributed systems, in a simple and efficient way. > > We believe that the ASF is the right venue to foster an open-source > community around DistributedLog’s development. We expect that > DistributedLog will benefit from collaboration with related Apache > projects, and under the auspices of the ASF will attract talented > contributors who will push DistributedLog’s development forward at a faster > pace. > > We believe that the timing is right for DistributedLog’s development to > move to the ASF: DistributedLog has already run in production at Twitter > for 3 years and served various workloads including a distributed database > journal, reliable cross datacenter replication, search ingestion, > andgeneral pub/sub messaging. The project is stable. We are excited to see > where an ASF-based community can take DistributedLog. > > = Current Status = > DistributedLog is a stable project that has been used in production at > Twitter for 3 years. The source code is public at github.com/twitter, > which will seed the Apache git repository. > > = Meritocracy = > We understand the central importance of meritocracy to the Apache Way. We > will work to establish a welcoming, fair and meritocratic community. > Several companies have already expressed interest in this project, and we > intend to invite additional developers to participate. We look forward to > growing a rich user and developer community. > > = Community = > There is a large need for a performant replicated log service for > applications such as distributed databases, distributed transactional > systems, replicated-state-machines and pub/sub messaging/queuing. We want > to attract more developers to the project, and we believe that the ASF’s > open and meritocratic philosophy will help us with this. We note the > success of other similar projects already part of the ASF, like Kafka. > > = Core Developers = > DistributedLog is actively developed within Twitter. Most of the > developers are from Twitter. Many of them are committers or PMC members of > Apache BookKeeper. Others aren’t currently affiliated with ASF so they will > require new ICLAs. > > = Alignment = > DistributedLog is related to several other Apache projects: > > * DistributedLog stores log segments as Ledgers in Apache BookKeeper. > * DistributedLog uses Apache ZooKeeper for naming and metadata management > and tracking the ownership of logs. > * DistributedLog uses Apache Thrift as its RPC and serialization > framework. > * In the long-term, DistributedLog’s data will be stored in Apache Hadoop > clusters powered by HDFS filesystem for archives and backup. > > = Known Risks = > == Orphaned Products == > DistributedLog is used as the fundamental messaging infrastructure at > Twitter. It has been serving production traffic for online database > systems, search ingestion and a general pub/sub system. Twitter remains > committed to developing and supporting the project. Twitter has a strong > track record in standing behind projects that were contributed to the ASF > by its employees, including Apache Mesos, Apache Aurora, Apache BookKeeper, > Apache Hadoop. There are many companies are interested in using it in > production. > > == Inexperience with Open Source == > The core developers of DistributedLog are committers of Apache BookKeeper. > Although other committers on the initial list are committers or have less > experience with the ASF, they already are active in Apache BookKeeper > community. We are confident that the project can be run in accordance with > Apache principles on an ongoing basis. > > == Homogeneous Developers == > The initial committers are from Twitter. We hope to encourage > contributions from other developers and grow them into committers after > they have had time to continue their contributions. > > == Reliance on Salaried Developers == > Many of DistributedLog’s initial set of committers work full-time on > DistributedLog, and are paid to do so. However, as mentioned elsewhere, we > anticipate growth in the developer community which we hope will include > people from industry, hobbyists, and academics who have an interested in > distributed messaging systems. > > == Relationships with Other Apache Products == > DistributedLog uses Apache BookKeeper to store log segments and Apache > ZooKeeper to store log metadata and manage log namespaces. It provides an > end-to-end solution for replicated logs, to make building reliable > distributed systems much easier. Unlike Kafka or ActiveMQ, DistributedLog > is not a full-fledged pub/sub, queuing or messaging system. Instead, it is > targeting on providing a fundamental building block for other distributed > systems, offering durability, replication and consistency. So it could be > used by other distributed systems, such as transactional log for replicated > state machines (e.g., HDFS NameNode), WAL for distributed databases (e.g. > HBase), Journal for in-memory services (e.g., Kestrel) and even storage > backend for a full-fledged messaging system. > > == An Excessive Fascination with the Apache Brand == > DistributedLog builds on two existing top-level projects, Apache > BookKeeper and Apache ZooKeeper. Some of the core developers actively > participate in both projects and understand well the implications of being > hosted by Apache. We would like this project to build on the same core > values of ASF and to grow a community based on meritocracy. Also, there are > several other projects already hosted by ASF in this space of reliable > messaging and that overlap with DistributedLog in interests and scope. > Consequently, the combination of all these observations makes us believe > that DistributedLog should be hosted by the ASF. > > = Documentation = > Building DistributedLog: Twitter’s high performance replicated log service > ( > https://blog.twitter.com/2015/building-distributedlog-twitter-s-high-performance-replicated-log-service > ) > > Documentation located in http://distributedlog.io. > > = Initial Source = > DistributedLog’s initial source contribution will come from > http://github.com/twitter/distributedlog/. > > = External Dependencies = > DistributedLog depends upon a number of third-party libraries, which we > list below. > > * Apache BookKeeper (Apache Software License v2.0) > * Apache Commons (Apache Software License v2.0) > * Apache Maven (Apache Software License v2.0) > * Apache Thrift (Apache Software License v2.0) > * Apache ZooKeeper (Apache Software License v2.0) > * Google Guava (Apache Software License v2.0) > * Mockito (MIT License) > * Junit (Eclipse Public License 1.0) > * LZ4-java (Apache Software License v2.0) > * SLF4J (MIT License) > * Twitter Finagle (Apache Software License v2.0) > * Twitter Scrooge (Apache Software License v2.0) > * Twitter Util (Apache Software License v2.0) > > = Required Resources = > We request that following resources be created for the project to use: > > == Mailing lists == > * priv...@distributedlog.incubator.apache.org (moderated subscriptions) > * comm...@distributedlog.incubator.apache.org > * d...@distributedlog.incubator.apache.org > * u...@distributedlog.incubator.apache.org > > == Git repository == > https://git.apache.org/distributedlog.git > > == JIRA instance == > JIRA project DLOG (DLOG or DL) > > = Initial Committers = > * Sijie Guo (Apache BookKeeper Committer, Twitter) > * Robin Dhamankar (Apache BookKeeper Committer) > * Leigh Stewart (Twitter) > * Dave Rusek (Twitter) > * Honggang Zhang (Twitter) > * Jordan Bull (Twitter) > * Satish Kotha (Twitter) > * Aniruddha Laud > * Franck Cuny (Twitter) > * Eitan Adler (Twitter) > > == Affiliations == > Most of the initial committers are employees of Twitter, except Robin > Dhamankar and Aniruddha Laud. > > = Sponsors = > == Champion == > Flavio Junqueira > > == Nominated Mentors == > * Flavio Junqueira > * Chris Nauroth > * Henry Saputra > > = Sponsoring Entity = > We ask that the Apache Incubator PMC to sponsor this proposal. > > >
