| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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. |
| --> |
| Apache REEF™ - a `stdlib` for Big Data |
| ============================================= |
| Apache REEF™ (Retainable Evaluator Execution Framework) is a library for developing portable applications for cluster resource managers such as [Apache Hadoop™ YARN][YARN] or [Apache Mesos™][Mesos]. Apache REEF drastically simplifies development of those resource managers through the following features: |
| |
| Features |
| -------- |
| * **Centralized Control Flow:** Apache REEF turns the chaos of a distributed application into events in a single machine, the Job Driver. Events include container allocation, Task launch, completion and failure. For failures, Apache REEF makes every effort of making the actual `Exception` thrown by the Task available to the Driver. |
| * **Task runtime:** Apache REEF provides a Task runtime called Evaluator. Evaluators are instantiated in every container of a REEF application. Evaluators can keep data in memory in between Tasks, which enables efficient pipelines on REEF. |
| * **Support for multiple resource managers:** Apache REEF applications are portable to any supported resource manager with minimal effort. Further, new resource managers are easy to support in REEF. |
| * **.NET and Java API:** Apache REEF is the only API to write YARN or Mesos applications in .NET. Further, a single REEF application is free to mix and match Tasks written for .NET or Java. |
| * **Plugins:** Apache REEF allows for plugins (called "Services") to augment its feature set without adding bloat to the core. REEF includes many Services, such as a name-based communications between Tasks, MPI-inspired group communications (`Broadcast`, `Reduce`, `Gather`, ...) and data ingress. |
| |
| REEF @ Apache Big Data 2016 |
| --------------------------- |
| |
| <iframe src="http://www.slideshare.net/slideshow/embed_code/key/1HgrkEUWqqD2x1" width="595" height="485" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC; border-width:1px; margin-bottom:5px; max-width: 100%;"> </iframe> |
| |
| Latest Release |
| -------------- |
| The latest release of Apache REEF is ${currentStableVersion}. Please go to the [downloads] page to find out more. |
| |
| [YARN]: https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/YARN.html |
| [Mesos]: https://mesos.apache.org/ |
| [downloads]: downloads.html |