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Posted to commits@reef.apache.org by jo...@apache.org on 2015/02/17 08:02:53 UTC
svn commit: r1660305 [6/14] - in /incubator/reef/site: ./ css/ images/
Modified: incubator/reef/site/introduction.html
URL: http://svn.apache.org/viewvc/incubator/reef/site/introduction.html?rev=1660305&r1=1660304&r2=1660305&view=diff
==============================================================================
--- incubator/reef/site/introduction.html (original)
+++ incubator/reef/site/introduction.html Tue Feb 17 07:02:52 2015
@@ -1,392 +1,407 @@
-<!DOCTYPE html>
-<!--
- | Generated by Apache Maven Doxia at 2015-01-23
- | 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="20150123" />
- <meta http-equiv="Content-Language" content="en" />
- <title>Apache REEF - Introduction to REEF</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>
-
-
- </head>
- <body class="topBarEnabled">
-
-
-
-
-
- <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">
- <span class="icon-bar"></span>
- <span class="icon-bar"></span>
- <span class="icon-bar"></span>
- </a>
-
- <ul class="nav">
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">Apache REEF <b class="caret"></b></a>
- <ul class="dropdown-menu">
-
- <li> <a href="index.html" title="Overview">Overview</a>
-</li>
-
- <li> <a href="faq.html" title="FAQ">FAQ</a>
-</li>
-
- <li> <a href="license.html" title="License">License</a>
-</li>
-
- <li> <a href="downloads.html" title="Downloads">Downloads</a>
-</li>
- </ul>
- </li>
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">Documentation <b class="caret"></b></a>
- <ul class="dropdown-menu">
-
- <li> <a href="introduction.html" title="Introduction to REEF">Introduction to REEF</a>
-</li>
-
- <li> <a href="tutorial.html" title="REEF Tutorial">REEF Tutorial</a>
-</li>
-
- <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>
-
- <li> <a href="wake.html" title="Wake">Wake</a>
-</li>
-
- <li> <a href="api.html" title="API">API</a>
-</li>
- </ul>
- </li>
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">Contribution <b class="caret"></b></a>
- <ul class="dropdown-menu">
-
- <li> <a href="contributing.html" title="Contributing">Contributing</a>
-</li>
-
- <li> <a href="committer-guide.html" title="Committer Guide">Committer Guide</a>
-</li>
-
- <li> <a href="coding-guideline.html" title="Coding Guideline">Coding Guideline</a>
-</li>
- </ul>
- </li>
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">Community <b class="caret"></b></a>
- <ul class="dropdown-menu">
-
- <li> <a href="team.html" title="Team">Team</a>
-</li>
-
- <li> <a href="mailing-list.html" title="Mailing List">Mailing List</a>
-</li>
-
- <li> <a href="issue-tracker.html" title="Issue Tracker">Issue Tracker</a>
-</li>
-
- <li> <a href="powered-by.html" title="Powered By">Powered By</a>
-</li>
- </ul>
- </li>
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">ASF <b class="caret"></b></a>
- <ul class="dropdown-menu">
-
- <li> <a href="http://incubator.apache.org/" title="Apache Incubator">Apache Incubator</a>
-</li>
-
- <li> <a href="http://www.apache.org/foundation/" title="Apache Foundation">Apache Foundation</a>
-</li>
-
- <li> <a href="http://www.apache.org/foundation/how-it-works.html" title="How Apache Works">How Apache Works</a>
-</li>
-
- <li> <a href="http://www.apache.org/licenses/LICENSE-2.0.html" title="The Apache License">The Apache License</a>
-</li>
-
- <li> <a href="http://www.apache.org/foundation/sponsorship.html" title="Sponsoring Apache">Sponsoring Apache</a>
-</li>
-
- <li> <a href="http://www.apache.org/foundation/thanks.html" title="Thanks">Thanks</a>
-</li>
- </ul>
- </li>
- </ul>
-
-
-
- <ul class="nav pull-right">
- <li class="dropdown">
- <a href="#" class="dropdown-toggle" data-toggle="dropdown">External Links <b class="caret"></b></a>
- <ul class="dropdown-menu">
- <li> <a href="https://github.com/apache/incubator-reef" title="Apache REEF Github">Apache REEF Github</a>
-</li>
- <li> <a href="http://www.apache.org" title="Apache">Apache</a>
-</li>
- <li> <a href="http://incubator.apache.org/" title="Apache Incubator">Apache Incubator</a>
-</li>
- </ul>
- </li>
- </ul>
-
- </div>
-
- </div>
- </div>
- </div>
-
- <div class="container-fluid">
- <div id="banner">
- <div class="pull-left">
- <a href="./" id="bannerLeft">
- <img src="REEFLogo.png" />
- </a>
- </div>
- <div class="pull-right"> <a href="http://incubator.apache.org/" id="bannerRight">
- <img src="ApacheIncubator.png" />
- </a>
- </div>
- <div class="clear"><hr/></div>
- </div>
-
- <div id="breadcrumbs">
- <ul class="breadcrumb">
-
-
- <li class="">
- <a href="index.html" title="Apache REEF">
- Apache REEF</a>
- <span class="divider">|</span>
- </li>
- <li class="active ">Introduction to REEF</li>
-
-
-
-
- </ul>
- </div>
-
-
- <div class="row-fluid">
- <div id="leftColumn" class="span2">
- <div class="well sidebar-nav">
-
-
- <ul class="nav nav-list">
- <li class="nav-header">Apache REEF</li>
-
- <li>
-
- <a href="index.html" title="Overview">
- <i class="none"></i>
- Overview</a>
- </li>
-
- <li>
-
- <a href="faq.html" title="FAQ">
- <i class="none"></i>
- FAQ</a>
- </li>
-
- <li>
-
- <a href="license.html" title="License">
- <i class="none"></i>
- License</a>
- </li>
-
- <li>
-
- <a href="downloads.html" title="Downloads">
- <i class="none"></i>
- Downloads</a>
- </li>
- <li class="nav-header">Documentation</li>
-
- <li class="active">
-
- <a href="#"><i class="none"></i>Introduction to REEF</a>
- </li>
-
- <li>
-
- <a href="tutorial.html" title="REEF Tutorial">
- <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>
-
- <a href="glossary.html" title="Glossary">
- <i class="none"></i>
- Glossary</a>
- </li>
-
- <li>
-
- <a href="tang.html" title="Tang">
- <i class="none"></i>
- Tang</a>
- </li>
-
- <li>
-
- <a href="wake.html" title="Wake">
- <i class="none"></i>
- Wake</a>
- </li>
-
- <li>
-
- <a href="api.html" title="API">
- <i class="none"></i>
- API</a>
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- <i class="none"></i>
- Contributing</a>
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- <i class="none"></i>
- Committer Guide</a>
- </li>
-
- <li>
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- <a href="coding-guideline.html" title="Coding Guideline">
- <i class="none"></i>
- Coding Guideline</a>
- </li>
- <li class="nav-header">Community</li>
-
- <li>
-
- <a href="team.html" title="Team">
- <i class="none"></i>
- Team</a>
- </li>
-
- <li>
-
- <a href="mailing-list.html" title="Mailing List">
- <i class="none"></i>
- Mailing List</a>
- </li>
-
- <li>
-
- <a href="issue-tracker.html" title="Issue Tracker">
- <i class="none"></i>
- Issue Tracker</a>
- </li>
-
- <li>
-
- <a href="powered-by.html" title="Powered By">
- <i class="none"></i>
- Powered By</a>
- </li>
- <li class="nav-header">ASF</li>
-
- <li>
-
- <a href="http://incubator.apache.org/" class="externalLink" title="Apache Incubator">
- <i class="none"></i>
- Apache Incubator</a>
- </li>
-
- <li>
-
- <a href="http://www.apache.org/foundation/" class="externalLink" title="Apache Foundation">
- <i class="none"></i>
- Apache Foundation</a>
- </li>
-
- <li>
-
- <a href="http://www.apache.org/foundation/how-it-works.html" class="externalLink" title="How Apache Works">
- <i class="none"></i>
- How Apache Works</a>
- </li>
-
- <li>
-
- <a href="http://www.apache.org/licenses/LICENSE-2.0.html" class="externalLink" title="The Apache License">
- <i class="none"></i>
- The Apache License</a>
- </li>
-
- <li>
-
- <a href="http://www.apache.org/foundation/sponsorship.html" class="externalLink" title="Sponsoring Apache">
- <i class="none"></i>
- Sponsoring Apache</a>
- </li>
-
- <li>
-
- <a href="http://www.apache.org/foundation/thanks.html" class="externalLink" title="Thanks">
- <i class="none"></i>
- Thanks</a>
- </li>
- </ul>
-
-
-
- <hr />
-
- <div id="poweredBy">
- <div class="clear"></div>
- <div class="clear"></div>
- <div class="clear"></div>
- <div class="clear"></div>
- <a href="http://maven.apache.org/" title="Built by Maven" class="poweredBy">
- <img class="builtBy" alt="Built by Maven" src="./images/logos/maven-feather.png" />
- </a>
- </div>
- </div>
- </div>
-
-
- <div id="bodyColumn" class="span10" >
-
- <h1>Introduction to REEF</h1>
+<!DOCTYPE html>
+<!--
+ | Generated by Apache Maven Doxia at 2015-02-17
+ | 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="20150217" />
+ <meta http-equiv="Content-Language" content="en" />
+ <title>Apache REEF - Introduction to REEF</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>
+
+
+ </head>
+ <body class="topBarEnabled">
+
+
+
+
+
+ <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">
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ </a>
+
+ <ul class="nav">
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Apache REEF <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+
+ <li> <a href="index.html" title="Overview">Overview</a>
+</li>
+
+ <li> <a href="faq.html" title="FAQ">FAQ</a>
+</li>
+
+ <li> <a href="license.html" title="License">License</a>
+</li>
+
+ <li> <a href="downloads.html" title="Downloads">Downloads</a>
+</li>
+
+ <li> <a href="apidocs/0.10.0-incubating/index.html" title="0.10.0-incubating API">0.10.0-incubating API</a>
+</li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Documentation <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+
+ <li> <a href="introduction.html" title="Introduction to REEF">Introduction to REEF</a>
+</li>
+
+ <li> <a href="tutorial.html" title="REEF Tutorial">REEF Tutorial</a>
+</li>
+
+ <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>
+
+ <li> <a href="wake.html" title="Wake">Wake</a>
+</li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Contribution <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+
+ <li> <a href="contributing.html" title="Contributing">Contributing</a>
+</li>
+
+ <li> <a href="committer-guide.html" title="Committer Guide">Committer Guide</a>
+</li>
+
+ <li> <a href="coding-guideline.html" title="Coding Guidelines">Coding Guidelines</a>
+</li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Community <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+
+ <li> <a href="team.html" title="Team">Team</a>
+</li>
+
+ <li> <a href="mailing-list.html" title="Mailing List">Mailing List</a>
+</li>
+
+ <li> <a href="issue-tracker.html" title="Issue Tracker">Issue Tracker</a>
+</li>
+
+ <li> <a href="powered-by.html" title="Powered By">Powered By</a>
+</li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">ASF <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+
+ <li> <a href="http://www.apache.org/foundation/" title="Apache Software Foundation">Apache Software Foundation</a>
+</li>
+
+ <li> <a href="http://www.apache.org/foundation/how-it-works.html" title="How Apache Works">How Apache Works</a>
+</li>
+
+ <li> <a href="http://incubator.apache.org/" title="Apache Incubator">Apache Incubator</a>
+</li>
+
+ <li> <a href="http://www.apache.org/licenses/LICENSE-2.0.html" title="Apache License">Apache License</a>
+</li>
+
+ <li> <a href="http://www.apache.org/foundation/sponsorship.html" title="Sponsorship">Sponsorship</a>
+</li>
+
+ <li> <a href="http://www.apache.org/foundation/thanks.html" title="Thanks">Thanks</a>
+</li>
+ </ul>
+ </li>
+ </ul>
+
+
+
+ <ul class="nav pull-right">
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">External Links <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li> <a href="https://github.com/apache/incubator-reef" title="Apache REEF GitHub">Apache REEF GitHub</a>
+</li>
+ <li> <a href="http://www.apache.org" title="Apache">Apache</a>
+</li>
+ <li> <a href="http://incubator.apache.org/" title="Apache Incubator">Apache Incubator</a>
+</li>
+ </ul>
+ </li>
+ </ul>
+
+ </div>
+
+ </div>
+ </div>
+ </div>
+
+ <div class="container-fluid">
+ <div id="banner">
+ <div class="pull-left">
+ <a href="./" id="bannerLeft">
+ <img src="REEFLogo.png" />
+ </a>
+ </div>
+ <div class="pull-right"> <a href="http://incubator.apache.org/" id="bannerRight">
+ <img src="ApacheIncubator.png" />
+ </a>
+ </div>
+ <div class="clear"><hr/></div>
+ </div>
+
+ <div id="breadcrumbs">
+ <ul class="breadcrumb">
+
+
+ <li class="">
+ <a href="index.html" title="Apache REEF">
+ Apache REEF</a>
+ <span class="divider">|</span>
+ </li>
+ <li class="active ">Introduction to REEF</li>
+
+
+
+
+ </ul>
+ </div>
+
+
+ <div class="row-fluid">
+ <div id="leftColumn" class="span2">
+ <div class="well sidebar-nav">
+
+
+ <ul class="nav nav-list">
+ <li class="nav-header">Apache REEF</li>
+
+ <li>
+
+ <a href="index.html" title="Overview">
+ <i class="none"></i>
+ Overview</a>
+ </li>
+
+ <li>
+
+ <a href="faq.html" title="FAQ">
+ <i class="none"></i>
+ FAQ</a>
+ </li>
+
+ <li>
+
+ <a href="license.html" title="License">
+ <i class="none"></i>
+ License</a>
+ </li>
+
+ <li>
+
+ <a href="downloads.html" title="Downloads">
+ <i class="none"></i>
+ Downloads</a>
+ </li>
+
+ <li>
+
+ <a href="apidocs/0.10.0-incubating/index.html" title="0.10.0-incubating API">
+ <i class="none"></i>
+ 0.10.0-incubating API</a>
+ </li>
+ <li class="nav-header">Documentation</li>
+
+ <li class="active">
+
+ <a href="#"><i class="none"></i>Introduction to REEF</a>
+ </li>
+
+ <li>
+
+ <a href="tutorial.html" title="REEF Tutorial">
+ <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>
+
+ <a href="glossary.html" title="Glossary">
+ <i class="none"></i>
+ Glossary</a>
+ </li>
+
+ <li>
+
+ <a href="tang.html" title="Tang">
+ <i class="none"></i>
+ Tang</a>
+ </li>
+
+ <li>
+
+ <a href="wake.html" title="Wake">
+ <i class="none"></i>
+ Wake</a>
+ </li>
+ <li class="nav-header">Contribution</li>
+
+ <li>
+
+ <a href="contributing.html" title="Contributing">
+ <i class="none"></i>
+ Contributing</a>
+ </li>
+
+ <li>
+
+ <a href="committer-guide.html" title="Committer Guide">
+ <i class="none"></i>
+ Committer Guide</a>
+ </li>
+
+ <li>
+
+ <a href="coding-guideline.html" title="Coding Guidelines">
+ <i class="none"></i>
+ Coding Guidelines</a>
+ </li>
+ <li class="nav-header">Community</li>
+
+ <li>
+
+ <a href="team.html" title="Team">
+ <i class="none"></i>
+ Team</a>
+ </li>
+
+ <li>
+
+ <a href="mailing-list.html" title="Mailing List">
+ <i class="none"></i>
+ Mailing List</a>
+ </li>
+
+ <li>
+
+ <a href="issue-tracker.html" title="Issue Tracker">
+ <i class="none"></i>
+ Issue Tracker</a>
+ </li>
+
+ <li>
+
+ <a href="powered-by.html" title="Powered By">
+ <i class="none"></i>
+ Powered By</a>
+ </li>
+ <li class="nav-header">ASF</li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/" class="externalLink" title="Apache Software Foundation">
+ <i class="none"></i>
+ Apache Software Foundation</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/how-it-works.html" class="externalLink" title="How Apache Works">
+ <i class="none"></i>
+ How Apache Works</a>
+ </li>
+
+ <li>
+
+ <a href="http://incubator.apache.org/" class="externalLink" title="Apache Incubator">
+ <i class="none"></i>
+ Apache Incubator</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/licenses/LICENSE-2.0.html" class="externalLink" title="Apache License">
+ <i class="none"></i>
+ Apache License</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/sponsorship.html" class="externalLink" title="Sponsorship">
+ <i class="none"></i>
+ Sponsorship</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/thanks.html" class="externalLink" title="Thanks">
+ <i class="none"></i>
+ Thanks</a>
+ </li>
+ </ul>
+
+
+
+ <hr />
+
+ <div id="poweredBy">
+ <div class="clear"></div>
+ <div class="clear"></div>
+ <div class="clear"></div>
+ <div class="clear"></div>
+ <a href="http://maven.apache.org/" title="Built by Maven" class="poweredBy">
+ <img class="builtBy" alt="Built by Maven" src="./images/logos/maven-feather.png" />
+ </a>
+ </div>
+ </div>
+ </div>
+
+
+ <div id="bodyColumn" class="span10" >
+
+ <!-- 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. --><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>
@@ -420,35 +435,36 @@
<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>
-
+<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
+ <a href="http://www.apache.org/">The Apache Software Foundation</a>.
+ 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>
<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>
-
-
- </div>
- </footer>
- </body>
-</html>
+ trademarks of their respective owners.</div>
+
+
+ </div>
+ </footer>
+ </body>
+</html>
\ No newline at end of file
Modified: incubator/reef/site/issue-tracker.html
URL: http://svn.apache.org/viewvc/incubator/reef/site/issue-tracker.html?rev=1660305&r1=1660304&r2=1660305&view=diff
==============================================================================
--- incubator/reef/site/issue-tracker.html (original)
+++ incubator/reef/site/issue-tracker.html Tue Feb 17 07:02:52 2015
@@ -1,421 +1,437 @@
-<!DOCTYPE html>
-<!--
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- | Rendered using Apache Maven Fluido Skin 1.3.1
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