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Posted to commits@reef.apache.org by jo...@apache.org on 2015/01/06 03:30:27 UTC
svn commit: r1649719 [4/9] - in /incubator/reef/site: ./ css/ images/
images/logos/ images/profiles/ img/ js/
Added: incubator/reef/site/introduction.html
URL: http://svn.apache.org/viewvc/incubator/reef/site/introduction.html?rev=1649719&view=auto
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--- incubator/reef/site/introduction.html (added)
+++ incubator/reef/site/introduction.html Tue Jan 6 02:30:26 2015
@@ -0,0 +1,460 @@
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+
+ <h1>Introduction to REEF</h1>
+<p>It is instructive to first remind us of how MapReduce works: Hadoop Map-Reduce schedules compute tasks on containers for executing map and reduce functions on record data. The basic structure of a Map-Reduce job is as follows. For each input block, schedule a map task that passes each internal record to a user-defined map function and materializes the output in key-sorted order. Further, assign a user-defined number of reduce tasks to non-overlapping portions of the key-space from the map output, then shuffle it across the network to where the respective reduce task is scheduled. For each reduce task, perform a global key-based sort on the shuffled data, group it by key and call the reduce function on each record group; storing the output in a durable fashion (i.e., HDFS).</p>
+<p>From the perspective of the scheduler, a number of issues arise that must be appropriately handled in order to scale-out to massive datasets. First, each map task should be scheduled close to where the input block resides; ideally on the same machine or rack. Second, failures can occur at the task level at any step; requiring backup tasks to be scheduled or the job being aborted. Third, performance bottlenecks can cause an imbalance in the task-level progress. The scheduler must react to these stragglers by scheduling clones and incorporating the logical task that crosses the finish line first.</p>
+<p>Anyone of these issues can limit the scale-out degree of a Map-Reduce job. In what follows, we perscribe a scheduler framework that provides task life-cycle management mechanisms. Using this framework, we developed a complete version of the Map-Reduce runtime that addresses the above issues. Our framework is designed around three components.</p>
+
+<ol style="list-style-type: decimal">
+
+<li><tt>Driver</tt>: captures the client code embodying the scheduler</li>
+
+<li><tt>Evaluator</tt>: provides a runtime environment on a container.</li>
+
+<li><tt>Task</tt>: encapsulates the task-level client code to be executed in an Evaluator.</li>
+</ol>
+<p>Below, we describe the client facing interfaces to these components. The core REEF control flow design is based on the reactive extensions (Rx), which enforce asynchronous message-passing method signatures. In Rx terms, interfaces are based on an observer pattern, which expose methods that accept messages from a (possibly remote) asynchronous caller.</p>
+<p><br /></br></p>
+
+ <img src="reef-architecture.png" alt="" /></img>
+
+<p><i>A running REEF job with two RunningEvaluators and one RunningTask</i></p>
+<p><br /></br></p>
+<p>The above figure presents the REEF components in terms of a running application, which is written in terms of a Driver and task-specific <tt>Task</tt> modules. The application code is packaged and submitted to a REEF client API, which in turn submits a REEF-AM configuration to YARN. The REEF-AM contains a runtime for launching the <tt>Driver</tt> and client libraries for requesting Evaluators and launching <tt>Activities</tt>. When a request for Evaluators is made, the REEF-AM negotiates containers with the YARN-RM and launches an <tt>Evaluator</tt> runtime on the YARN-NM that hosts the allocated container. In turn, the Driver is given an <tt>Evaluator</tt> object reference, which it uses to submit an <tt>Task</tt>. The <tt>Driver</tt> is also given a <tt>Task</tt> object reference, which it may use to send messages to the <tt>Task</tt> running in the Evaluator. The REEF layer implements these communication channels and encodes the computational life-cycle as state transitions, w
hich are surfaced to the <tt>Driver</tt> in the form of Rx messages.</p>
+<div class="section">
+<div class="section">
+<h3>Computational Life-Cycle<a name="Computational_Life-Cycle"></a></h3>
+<p><br /></br></p>
+
+ <img src="states-horizontal.png" alt="" /></img>
+
+<p><i>States of Evaluator, Contexts, and Activities</i></p>
+<p><br /></br></p>
+<p>The Figure above describes the state transitions for (a) <tt>Evaluator</tt> and <tt>Context</tt> and (b) <tt>Task</tt> components. Each state transition is associated with an object reference that is surfaced to the <tt>Driver</tt> in an Rx-style interface. For instance, when the YARN-RM notifies the REEF-AM of an allocated container, the <tt>Driver</tt> is given an <tt>AllocatedEvaluator</tt> object; containing methods for adding configurations (i.e., for data services, see below) and file resources, and submit methods that bootstraps the <tt>Evaluator</tt> runtime on the YARN-NM. When an <tt>Evaluator</tt> bootstrap successfully completes, the <tt>Driver</tt> is given an <tt>ActiveContext</tt> object, which can be used to launch <tt>Activities</tt> or to initiate a close, which triggers a shutdown event at the <tt>Evaluator</tt> runtime and a subsequent container release at the YARN-RM. If at any point a failure occurs, the <tt>Driver</tt> is passed a <tt>FailedEvaluator</tt> o
bject; containing an exception trace when possible.</p>
+<p>Recall that the <tt>Driver</tt> launches a <tt>Task</tt> on a submit method call from the <tt>ActiveContext</tt> reference. This state transition is denoted in the Figure above by the edge labeled submit; spanning the two state machines. The REEF-AM passes a <tt>RunningActivity</tt> object to the <tt>Driver</tt> after receiving confirmation of a successful <tt>Task</tt> start or resume. The <tt>Driver</tt> may use the <tt>RunningActivity</tt> reference to close or suspend the execution; triggering a <tt>CompletedActivity</tt> or <tt>SuspendedActivity</tt> object reference to the <tt>Driver</tt>. The <tt>SuspendedActivity</tt> object contains a memento used to resume the execution on some (possibly alternative) <tt>ActiveContext</tt>. Exceptions during the <tt>Task</tt> execution are surfaced to the <tt>Driver</tt> in the form of a <tt>FailedActivity</tt>, which contains the actual exception object.</p></div>
+<div class="section">
+<h3>Task Component<a name="Task_Component"></a></h3>
+<p>A <tt>Task</tt> encapsulates the task work of a job. The client interface contains a single synchronous call method that takes an optional memento argument and returns a byte array, which will be packaged with the <tt>CompletedActivity</tt> object surfaced to the <tt>Driver</tt>. An exception may be thrown at any point during the call method; returning control back to the <tt>Evaluator</tt>, which packages the exception and sends it to the <tt>Driver</tt> where it is surfaced as a <tt>FailedActivity</tt>. The <tt>Evaluator</tt> periodically performs a heartbeat with the REEF-AM to convey its status information. A <tt>Task</tt> can optionally implement a method interface that, when called, returns a (bounded) byte array, which the <tt>Evaluator</tt> includes in its heartbeat to the REEF-AM and surfaced to the <tt>Driver</tt>.</p></div></div>
+ </div>
+ </div>
+ </div>
+
+ <hr/>
+
+ <footer>
+ <div class="container-fluid">
+ <div class="row-fluid">
+ <p >Copyright © 2015.
+ All rights reserved.
+
+ </p>
+ </div>
+
+
+<div class="container-fluid">
+ <div class="row-fluid">
+ <a href="http://www.apache.org">Apache Software Foundation</a>
+ </div>
+</div>
+
+<div class="row span12">Apache REEF, REEF, Apache, the Apache feather logo, and the Apache REEF logo are trademarks
+ of The Apache Software Foundation. All other marks mentioned may be trademarks or registered
+ trademarks of their respective owners.</div>
+
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Added: incubator/reef/site/issue-tracker.html
URL: http://svn.apache.org/viewvc/incubator/reef/site/issue-tracker.html?rev=1649719&view=auto
==============================================================================
--- incubator/reef/site/issue-tracker.html (added)
+++ incubator/reef/site/issue-tracker.html Tue Jan 6 02:30:26 2015
@@ -0,0 +1,427 @@
+<!DOCTYPE html>
+<!--
+ | Generated by Apache Maven Doxia at 2015-01-02
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+</li>
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+ <img class="builtBy" alt="Built by Maven" src="./images/logos/maven-feather.png" />
+ </a>
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+ <div id="bodyColumn" class="span10" >
+
+ <h1>Issue Tracker</h1>
+<p>Please visit the <a class="externalLink" href="https://issues.apache.org/jira/browse/REEF">ASF JIRA</a> website for the most updated issues.</p>
+ </div>
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+ <footer>
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+ All rights reserved.
+
+ </p>
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+
+<div class="container-fluid">
+ <div class="row-fluid">
+ <a href="http://www.apache.org">Apache Software Foundation</a>
+ </div>
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+<div class="row span12">Apache REEF, REEF, Apache, the Apache feather logo, and the Apache REEF logo are trademarks
+ of The Apache Software Foundation. All other marks mentioned may be trademarks or registered
+ trademarks of their respective owners.</div>
+
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+ </footer>
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+</html>
Added: incubator/reef/site/issue-tracking.html
URL: http://svn.apache.org/viewvc/incubator/reef/site/issue-tracking.html?rev=1649719&view=auto
==============================================================================
--- incubator/reef/site/issue-tracking.html (added)
+++ incubator/reef/site/issue-tracking.html Tue Jan 6 02:30:26 2015
@@ -0,0 +1,430 @@
+<!DOCTYPE html>
+<!--
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+ | Rendered using Apache Maven Fluido Skin 1.3.1
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+ <meta charset="UTF-8" />
+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+ <meta name="Date-Revision-yyyymmdd" content="20150106" />
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+ <title>Apache REEF - Issue Tracking</title>
+ <link rel="stylesheet" href="./css/apache-maven-fluido-1.3.1.min.css" />
+ <link rel="stylesheet" href="./css/site.css" />
+ <link rel="stylesheet" href="./css/print.css" media="print" />
+
+
+ <script type="text/javascript" src="./js/apache-maven-fluido-1.3.1.min.js"></script>
+
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+ <body class="topBarEnabled">
+
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+
+ <div id="topbar" class="navbar navbar-fixed-top ">
+ <div class="navbar-inner">
+ <div class="container-fluid">
+ <a data-target=".nav-collapse" data-toggle="collapse" class="btn btn-navbar">
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+ </a>
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+ <ul class="nav">
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+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Apache REEF <b class="caret"></b></a>
+ <ul class="dropdown-menu">
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+</li>
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+</li>
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+ <li> <a href="reef-examples.html" title="Further REEF Examples">Further REEF Examples</a>
+</li>
+
+ <li> <a href="glossary.html" title="Glossary">Glossary</a>
+</li>
+
+ <li> <a href="tang.html" title="Tang">Tang</a>
+</li>
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+ <li> <a href="wake.html" title="Wake">Wake</a>
+</li>
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+ <li> <a href="apidocs/index.html" title="API (0.10-incubating-SNAPSHOT)">API (0.10-incubating-SNAPSHOT)</a>
+</li>
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+ <ul class="dropdown-menu">
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+ <ul class="dropdown-menu">
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+</li>
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+</li>
+
+ <li> <a href="coding-guideline.html" title="Coding Guideline">Coding Guideline</a>
+</li>
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+ <ul class="dropdown-menu">
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+</li>
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+</li>
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+</li>
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+</li>
+ <li> <a href="http://incubator.apache.org/" title="Apache Incubator">Apache Incubator</a>
+</li>
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+
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+ <div id="banner">
+ <div class="pull-left">
+ <a href="./" id="bannerLeft">
+ <img src="REEFLogo.png" />
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+ <img src="ApacheIncubator.png" />
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+ <ul class="breadcrumb">
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+ Apache REEF</a>
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+
+
+
+
+ </ul>
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+ <div class="well sidebar-nav">
+
+
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+ </li>
+
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+
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+ <i class="none"></i>
+ REEF Tutorial</a>
+ </li>
+
+ <li>
+
+ <a href="reef-examples.html" title="Further REEF Examples">
+ <i class="none"></i>
+ Further REEF Examples</a>
+ </li>
+
+ <li>
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+ <i class="none"></i>
+ Glossary</a>
+ </li>
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+
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+ <i class="none"></i>
+ Tang</a>
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+ Wake</a>
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+ Committer Guide</a>
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+ Apache Foundation</a>
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+ <i class="none"></i>
+ How Apache Works</a>
+ </li>
+
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+
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+ <i class="none"></i>
+ The Apache License</a>
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+ Sponsoring Apache</a>
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+ <div id="bodyColumn" class="span10" >
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+ <div class="section">
+<h2>Issue Tracking<a name="Issue_Tracking"></a></h2><a name="Issue_Tracking"></a>
+<p>No issue management system is defined. Please check back at a later date.</p></div>
+ </div>
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+ <p >Copyright © 2015.
+ All rights reserved.
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+ </p>
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+
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+<div class="container-fluid">
+ <div class="row-fluid">
+ <a href="http://www.apache.org">Apache Software Foundation</a>
+ </div>
+</div>
+
+<div class="row span12">Apache REEF, REEF, Apache, the Apache feather logo, and the Apache REEF logo are trademarks
+ of The Apache Software Foundation. All other marks mentioned may be trademarks or registered
+ trademarks of their respective owners.</div>
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