| <!-- |
| 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. |
| --> |
| <!DOCTYPE html> |
| |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8"> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags --> |
| |
| <title>Apache Flink 0.10-SNAPSHOT Documentation: General Architecture and Process Model</title> |
| |
| <link rel="shortcut icon" href="http://flink.apache.org/docs/master/page/favicon.ico" type="image/x-icon"> |
| <link rel="icon" href="http://flink.apache.org/docs/master/page/favicon.ico" type="image/x-icon"> |
| |
| <!-- Bootstrap --> |
| <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css"> |
| <link rel="stylesheet" href="http://flink.apache.org/docs/master/page/css/flink.css"> |
| <link rel="stylesheet" href="http://flink.apache.org/docs/master/page/css/syntax.css"> |
| <link rel="stylesheet" href="http://flink.apache.org/docs/master/page/css/codetabs.css"> |
| |
| <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries --> |
| <!-- WARNING: Respond.js doesn't work if you view the page via file:// --> |
| <!--[if lt IE 9]> |
| <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script> |
| <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script> |
| <![endif]--> |
| </head> |
| <body> |
| |
| |
| |
| |
| |
| |
| <!-- Top navbar. --> |
| <nav class="navbar navbar-default navbar-fixed-top"> |
| <div class="container"> |
| <!-- The logo. --> |
| <div class="navbar-header"> |
| <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| </button> |
| <div class="navbar-logo"> |
| <a href="http://flink.apache.org"><img alt="Apache Flink" src="http://flink.apache.org/docs/master/page/img/navbar-brand-logo.jpg"></a> |
| </div> |
| </div><!-- /.navbar-header --> |
| |
| <!-- The navigation links. --> |
| <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> |
| <ul class="nav navbar-nav"> |
| <li><a href="http://flink.apache.org/docs/master/index.html">Overview<span class="hidden-sm hidden-xs"> 0.10</span></a></li> |
| |
| <!-- Setup --> |
| <li class="dropdown"> |
| <a href="http://flink.apache.org/docs/master/setup" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Setup <span class="caret"></span></a> |
| <ul class="dropdown-menu" role="menu"> |
| <li><a href="http://flink.apache.org/docs/master/setup/building.html">Get Flink 0.10-SNAPSHOT</a></li> |
| |
| <li class="divider"></li> |
| <li role="presentation" class="dropdown-header"><strong>Deployment</strong></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/local_setup.html" class="active">Local</a></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/cluster_setup.html">Cluster (Standalone)</a></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/yarn_setup.html">YARN</a></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/gce_setup.html">GCloud</a></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/flink_on_tez.html">Flink on Tez <span class="badge">Beta</span></a></li> |
| |
| <li class="divider"></li> |
| <li><a href="http://flink.apache.org/docs/master/setup/config.html">Configuration</a></li> |
| </ul> |
| </li> |
| |
| <!-- Programming Guides --> |
| <li class="dropdown"> |
| <a href="http://flink.apache.org/docs/master/apis" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Programming Guides <span class="caret"></span></a> |
| <ul class="dropdown-menu" role="menu"> |
| <li><a href="http://flink.apache.org/docs/master/apis/programming_guide.html"><strong>Batch: DataSet API</strong></a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/streaming_guide.html"><strong>Streaming: DataStream API</strong> <span class="badge">Beta</span></a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/python.html">Python API <span class="badge">Beta</span></a></li> |
| |
| <li class="divider"></li> |
| <li><a href="scala_shell.html">Interactive Scala Shell</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/dataset_transformations.html">Dataset Transformations</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/best_practices.html">Best Practices</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/example_connectors.html">Connectors</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/examples.html">Examples</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/local_execution.html">Local Execution</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/cluster_execution.html">Cluster Execution</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/cli.html">Command Line Interface</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/web_client.html">Web Client</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/iterations.html">Iterations</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/java8.html">Java 8</a></li> |
| <li><a href="http://flink.apache.org/docs/master/apis/hadoop_compatibility.html">Hadoop Compatability <span class="badge">Beta</span></a></li> |
| </ul> |
| </li> |
| |
| <!-- Libraries --> |
| <li class="dropdown"> |
| <a href="http://flink.apache.org/docs/master/libs" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Libraries <span class="caret"></span></a> |
| <ul class="dropdown-menu" role="menu"> |
| <li><a href="http://flink.apache.org/docs/master/libs/spargel_guide.html">Graphs: Spargel</a></li> |
| <li><a href="http://flink.apache.org/docs/master/libs/gelly_guide.html">Graphs: Gelly <span class="badge">Beta</span></a></li> |
| <li><a href="http://flink.apache.org/docs/master/libs/ml/">Machine Learning <span class="badge">Beta</span></a></li> |
| <li><a href="http://flink.apache.org/docs/master/libs/table.html">Relational: Table <span class="badge">Beta</span></a></li> |
| </ul> |
| </li> |
| |
| <!-- Internals --> |
| <li class="dropdown"> |
| <a href="http://flink.apache.org/docs/master/internals" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Internals <span class="caret"></span></a> |
| <ul class="dropdown-menu" role="menu"> |
| <li role="presentation" class="dropdown-header"><strong>Contribute</strong></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/how_to_contribute.html">How to Contribute</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/coding_guidelines.html">Coding Guidelines</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/ide_setup.html">IDE Setup</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/logging.html">Logging</a></li> |
| <li class="divider"></li> |
| <li role="presentation" class="dropdown-header"><strong>Internals</strong></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/general_arch.html">Architecture & Process Model</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/types_serialization.html">Type Extraction & Serialization</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/job_scheduling.html">Jobs & Scheduling</a></li> |
| <li><a href="http://flink.apache.org/docs/master/internals/add_operator.html">How-To: Add an Operator</a></li> |
| </ul> |
| </li> |
| </ul> |
| <form class="navbar-form navbar-right hidden-sm hidden-md" role="search" action="http://flink.apache.org/docs/master/search-results.html"> |
| <div class="form-group"> |
| <input type="text" class="form-control" name="q" placeholder="Search all pages"> |
| </div> |
| <button type="submit" class="btn btn-default">Search</button> |
| </form> |
| </div><!-- /.navbar-collapse --> |
| </div><!-- /.container --> |
| </nav> |
| |
| |
| |
| |
| <!-- Main content. --> |
| <div class="container"> |
| |
| |
| <div class="row"> |
| <div class="col-sm-10 col-sm-offset-1"> |
| <h1>General Architecture and Process Model</h1> |
| |
| |
| |
| <ul id="markdown-toc"> |
| <li><a href="#the-processes" id="markdown-toc-the-processes">The Processes</a></li> |
| <li><a href="#component-stack" id="markdown-toc-component-stack">Component Stack</a></li> |
| <li><a href="#projects-and-dependencies" id="markdown-toc-projects-and-dependencies">Projects and Dependencies</a></li> |
| </ul> |
| |
| <h2 id="the-processes">The Processes</h2> |
| |
| <p>When the Flink system is started, it bring up the <em>JobManager</em> and one or more <em>TaskManagers</em>. The JobManager |
| is the coordinator of the Flink system, while the TaskManagers are the workers that execute parts of the |
| parallel programs. When starting the system in <em>local</em> mode, a single JobManager and TaskManager are brought |
| up within the same JVM.</p> |
| |
| <p>When a program is submitted, a client is created that performs the pre-processing and turns the program |
| into the parallel data flow form that is executed by the JobManager and TaskManagers. The figure below |
| illustrates the different actors in the system very coarsely.</p> |
| |
| <div style="text-align: center;"> |
| <img src="fig/ClientJmTm.svg" alt="The Interactions between Client, JobManager and TaskManager" height="400px" style="text-align: center;" /> |
| </div> |
| |
| <h2 id="component-stack">Component Stack</h2> |
| |
| <p>An alternative view on the system is given by the stack below. The different layers of the stack build on |
| top of each other and raise the abstraction level of the program representations they accept:</p> |
| |
| <ul> |
| <li> |
| <p>The <strong>runtime</strong> layer receives a program in the form of a <em>JobGraph</em>. A JobGraph is a generic parallel |
| data flow with arbitrary tasks that consume and produce data streams.</p> |
| </li> |
| <li> |
| <p>The <strong>optimizer</strong> and <strong>common api</strong> layer takes programs in the form of operator DAGs. The operators are |
| specific (e.g., Map, Join, Filter, Reduce, …), but are data type agnostic. The concrete types and their |
| interaction with the runtime is specified by the higher layers.</p> |
| </li> |
| <li> |
| <p>The <strong>API layer</strong> implements multiple APIs that create operator DAGs for their programs. Each API needs |
| to provide utilities (serializers, comparators) that describe the interaction between its data types and |
| the runtime.</p> |
| </li> |
| </ul> |
| |
| <div style="text-align: center;"> |
| <img src="fig/stack.svg" alt="The Flink component stack" width="800px" /> |
| </div> |
| |
| <h2 id="projects-and-dependencies">Projects and Dependencies</h2> |
| |
| <p>The Flink system code is divided into multiple sub-projects. The goal is to reduce the number of |
| dependencies that a project implementing a Flink progam needs, as well as to faciltate easier testing |
| of smaller sub-modules.</p> |
| |
| <p>The individual projects and their dependencies are shown in the figure below.</p> |
| |
| <div style="text-align: center;"> |
| <img src="fig/projects_dependencies.svg" alt="The Flink sub-projects and their dependencies" height="600px" style="text-align: center;" /> |
| </div> |
| |
| <p>In addition to the projects listed in the figure above, Flink currently contains the following sub-projects:</p> |
| |
| <ul> |
| <li> |
| <p><code>flink-dist</code>: The <em>distribution</em> project. It defines how to assemble the compiled code, scripts, and other resources |
| into the final folder structure that is ready to use.</p> |
| </li> |
| <li> |
| <p><code>flink-staging</code>: A series of projects that are in an early version. Currently contains |
| among other things projects for YARN support, JDBC data sources and sinks, hadoop compatibility, |
| graph specific operators, and HBase connectors.</p> |
| </li> |
| <li> |
| <p><code>flink-quickstart</code>: Scripts, maven archetypes, and example programs for the quickstarts and tutorials.</p> |
| </li> |
| <li> |
| <p><code>flink-contrib</code>: Useful tools contributed by users. The code is maintained mainly by external contributors. The requirements for code being accepted into <code>flink-contrib</code> are lower compared to the rest of the code.</p> |
| </li> |
| </ul> |
| |
| |
| </div> |
| |
| <div class="col-sm-10 col-sm-offset-1"> |
| <!-- Disqus thread and some vertical offset --> |
| <div style="margin-top: 75px; margin-bottom: 50px" id="disqus_thread"></div> |
| </div> |
| </div> |
| |
| </div><!-- /.container --> |
| |
| <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --> |
| <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script> |
| <!-- Include all compiled plugins (below), or include individual files as needed --> |
| <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script> |
| <script src="http://flink.apache.org/docs/master/page/js/codetabs.js"></script> |
| |
| <!-- Google Analytics --> |
| <script> |
| (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ |
| (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), |
| m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) |
| })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); |
| |
| ga('create', 'UA-52545728-1', 'auto'); |
| ga('send', 'pageview'); |
| </script> |
| |
| <!-- Disqus --> |
| <script type="text/javascript"> |
| var disqus_shortname = 'stratosphere-eu'; |
| (function() { |
| var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; |
| dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js'; |
| (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); |
| })(); |
| </script> |
| </body> |
| </html> |
