Weave is a simple set of libraries that allows you to easily manage distributed applications through an abstraction layer  built on Apache YARN. Weave allows you to use YARN’s distributed capabilities with a programming model that is similar to  running threads. Weave is NOT a replacement for Apache YARN. It is instead a value-added framework that operates on top of Apache YARN.

Weave dramatically simplifies and reduces your development efforts, enabling you to quickly and easily manage your distributed applications through its friendly abstraction layer built on YARN. YARN can normally be quite difficult to use and requires a large ramp up effort, especially since it is built only for MapReduce and is normally meant only for managing batch jobs. YARN, however, can be used as a generalized custom resource management tool that can run any type of job, and could possibly be used for batch jobs, real time jobs, and long running jobs. Unfortunately, YARN’s capabilities are too low level to allow you to quickly develop an application, requiring a great deal of boilerplate code even for simple applications, and its logging output does not become available until the application is finished. This becomes an especially serious issue when managing long running jobs: since those jobs never finish you cannot view the logs, which makes it very difficult to develop and debug such applications. Finally, YARN does not provide standard support for application lifecycle management, communication between containers and the Application Master, and handling application level errors. Continuuity Weave empowers you, the developer, to quickly and easily manage your distributed applications with a much simpler programming model. Using Continuuity Weave, you can easily and quickly build, test, run, and debug your YARN applications, dramatically reducing your development effort and simplifying the management of resources and jobs in your distributed applications.

Continuuity Weave provides you with the following benefits:

• A simplified API for specifying, running and managing applications
• A simplified way to specify and manage the stages of the application lifecycle
• A generic Application Master to better support simple applications
• Simplified archive management
• Log and metrics aggregation for your applications, with improved control over application logs, metrics and errors
• Discovery service

To get started with Weave, visit http://continuuity.github.io/weave/.

Are you interested in making Weave better? Our development model is a simple pull based model with a consensus building phase - similar to the Apache's voting process. If you think that you help make Weave better, add new features or fix bugs in Weave or even if you have an idea on how to improve something that's already there in Weave, here's how you can do t hat.

• Fork weave into your own GitHub repository
• Create a topic branch with an appropriate name
• Work on your favourite feature to your content
• Once you are satisifed, create a pull request by going continuuity/weave project.
• Address all the review comments * Once addressed, the changes will be committed to the continuuity/weave repo.

User Group: https://groups.google.com/d/forum/weave-user

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.