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Posted to commits@giraph.apache.org by ac...@apache.org on 2013/05/07 00:20:04 UTC
git commit: updated refs/heads/trunk to e495238
Updated Branches:
refs/heads/trunk 56d8e8988 -> e495238bb
GIRAPH-621: Website Documentation: Basic Design Document (aching)
Project: http://git-wip-us.apache.org/repos/asf/giraph/repo
Commit: http://git-wip-us.apache.org/repos/asf/giraph/commit/e495238b
Tree: http://git-wip-us.apache.org/repos/asf/giraph/tree/e495238b
Diff: http://git-wip-us.apache.org/repos/asf/giraph/diff/e495238b
Branch: refs/heads/trunk
Commit: e495238bb16f248c9a100f62f17449f8c381e3b9
Parents: 56d8e89
Author: Avery Ching <ac...@fb.com>
Authored: Mon May 6 15:19:24 2013 -0700
Committer: Avery Ching <ac...@fb.com>
Committed: Mon May 6 15:19:24 2013 -0700
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CHANGELOG | 2 +
src/site/resources/images/ExampleSSSP.svg | 4 +
src/site/site.xml | 6 +-
src/site/xdoc/build.xml | 62 +++++++++++++++
src/site/xdoc/faq.xml | 45 +++++++++++
src/site/xdoc/implementation.xml | 40 ++++++++++
src/site/xdoc/index.xml | 99 +++++++++--------------
src/site/xdoc/intro.xml | 96 +++++++++++++++++++++++
src/site/xdoc/io.xml | 2 +-
9 files changed, 294 insertions(+), 62 deletions(-)
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http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/CHANGELOG
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diff --git a/CHANGELOG b/CHANGELOG
index 0a6e026..b8318b4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,8 @@
Giraph Change Log
Release 1.0.1 - unreleased
+ GIRAPH-621: Website Documentation: Basic Design Document (aching)
+
GIRAPH-658: Remove final modifier from SimpleHiveToEdge.initializeRecords
(majakabiljo)
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/resources/images/ExampleSSSP.svg
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diff --git a/src/site/resources/images/ExampleSSSP.svg b/src/site/resources/images/ExampleSSSP.svg
new file mode 100644
index 0000000..1cdd97f
--- /dev/null
+++ b/src/site/resources/images/ExampleSSSP.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" standalone="yes"?>
+
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+
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/site.xml
----------------------------------------------------------------------
diff --git a/src/site/site.xml b/src/site/site.xml
index 6956772..eb4fa31 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -69,8 +69,12 @@
</menu>
<menu name="User Docs" inherit="top">
+ <item name="Introduction" href="intro.html"/>
+ <item name="Building and Testing" href="build.html"/>
+ <item name="FAQ" href="faq.html"/>
+ <item name="Implementation" href="implementation.html"/>
<item name="Page Rank Example" href="pagerank.html"/>
- <item name="Input/output in Giraph" href="io.html"/>
+ <item name="Input/Output in Giraph" href="io.html"/>
<item name="Aggregators" href="aggregators.html"/>
<item name="Javadoc" href="javadoc_modules.html"/>
<item name="Presentations" href="presentations.html"/>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/build.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/build.xml b/src/site/xdoc/build.xml
new file mode 100644
index 0000000..c31880e
--- /dev/null
+++ b/src/site/xdoc/build.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+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.
+-->
+
+<document xmlns="http://maven.apache.org/XDOC/2.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
+ <properties>
+ <title>Building and testing</title>
+ </properties>
+
+ <body>
+
+<section name="Building and Testing">
+
+<p>
+You can check out Giraph with <tt>git clone https://github.com/apache/giraph.git</tt>. In order to build and test Giraph, you will need the following:</p>
+<ul>
+ <li>Java 1.6</li>
+ <li>Maven 3 or higher. Giraph uses the <a href="http://sonatype.github.com/munge-maven-plugin/">munge plugin</a>, which requires Maven 3, to support multiple versions of Hadoop. Also, the web site plugin requires Maven 3.</li>
+ <li>One of the supported versions of Apache Hadoop:
+ <ul>
+ <li>YARN version: Apache Hadoop 2.0.3-alpha, other versions may work as well</li>
+ <li>Secure Hadoop versions: Apache Hadoop 0.20.203, 0.20.204, other secure versions may work as well</li>
+ <li>Unsecure Hadoop versions: Apache Hadoop 0.20.1, 0.20.2, 0.20.3. While we provide support for unsecure Hadoop with the maven profile 'hadoop_non_secure', we have been primarily focusing on secure Hadoop releases at this time.</li>
+ <li>Other distributions that included Apache Hadoop reported to work include: Cloudera CDH3u0, CDH3u1</li>
+ </ul>
+ </li>
+</ul>
+
+<p>Use the maven commands with secure Hadoop to:</p>
+<ul>
+ <li>compile (i.e <tt>mvn compile</tt>)</li>
+ <li>package (i.e. <tt>mvn package</tt>)</li>
+ <li>test (i.e. <tt>mvn test</tt>) For testing, one can submit the test to a running Hadoop instance (i.e. <tt>mvn test -Dprop.mapred.job.tracker=localhost:50300</tt>)</li>
+</ul>
+<p>For the non-secure versions of Hadoop, run the maven commands with the
+additional argument <tt>-Dhadoop=non_secure</tt> to enable the maven profile
+<tt>hadoop_non_secure</tt>. An example compilation command is
+<tt>mvn -Dhadoop=non_secure compile</tt>.</p>
+
+</section>
+
+ </body>
+</document>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/faq.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/faq.xml b/src/site/xdoc/faq.xml
new file mode 100644
index 0000000..9f86d10
--- /dev/null
+++ b/src/site/xdoc/faq.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+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.
+-->
+
+<document xmlns="http://maven.apache.org/XDOC/2.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
+ <properties>
+ <title>FAQ</title>
+ </properties>
+
+ <body>
+
+<section name="FAQ">
+
+<p>Here is a list of frequently asked questions.</p>
+<ul>
+ <li>Why does my Giraph job randomly fail after hundreds of supersteps?
+ <ul>
+ <li>In Hadoop 0.20.203.0 onwards, there is a limit on the number of counters one can use, which is set to 120 by default. This limit restricts the number of iterations/supersteps possible in Giraph. This limit can be increased by setting a parameter <tt>mapreduce.job.counters.limit</tt> in job tracker's config file mapred-site.xml.</li>
+ </ul>
+ </li>
+</ul>
+
+</section>
+
+ </body>
+</document>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/implementation.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/implementation.xml b/src/site/xdoc/implementation.xml
new file mode 100644
index 0000000..7b589d2
--- /dev/null
+++ b/src/site/xdoc/implementation.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+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.
+-->
+
+<document xmlns="http://maven.apache.org/XDOC/2.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
+ <properties>
+ <title>Implementation</title>
+ </properties>
+
+ <body>
+
+<section name="Implementation">
+
+<p>Giraph is an Apache open source project. A Giraph computation runs as a Hadoop job, hence any existing Hadoop user can immediately benefit from Giraph. Workers use ZooKeeper to elect a master that will coordinate computation. The graph is loaded and partitioned across workers. The master then dictates when workers should start computing consecutive supersteps. Once the computation has halted, workers save the output. Checkpoints are initiated at user-defined intervals and are used for automatic application restarts when any worker fails. Any worker can act as the master and one will automatically take over if the current master fails.</p>
+
+<p>Giraph offers several mechanisms that help implement graph algorithms at scale. You can input vertices and edges (see the <a href="io.html">input/output</a> section) from any input source. We support several Hadoop input formats as well as Hive tables. Aggregators allow applications to compute a global value from contributing values provided by each vertex, see the <a href="aggregators.html">aggregators</a> section. By default vertex and edge values and messages are stored in workers’ memory. However, you can decide to store the values and messages on disk, for example on a Hadoop cluster with limited memory but ample disk space.</p>
+
+</section>
+
+ </body>
+</document>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/index.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/index.xml b/src/site/xdoc/index.xml
index 47fd8f5..1c74de6 100644
--- a/src/site/xdoc/index.xml
+++ b/src/site/xdoc/index.xml
@@ -27,65 +27,44 @@ under the License.
</properties>
<body>
- <section name="Welcome To Apache Giraph">
- <p>Web and online social graphs have been rapidly growing in size and scale during the past decade. In 2008, Google estimated that the number of web pages reached over a trillion. Online social networking and email sites, including Yahoo!, Google, Microsoft, Facebook, LinkedIn, and Twitter, have hundreds of millions of users and are expected to grow much more in the future. Processing these graphs plays a big role in relevant and personalized information for users, such as results from a search engine or news in an online social networking site.</p>
-
- <p>Graph processing platforms to run large-scale algorithms (such as page rank, shared connections, personalization-based popularity, etc.) have become quite popular. Some recent examples include Pregel and HaLoop. For general-purpose big data computation, the map-reduce computing model has been well adopted and the most deployed map-reduce infrastructure is Apache Hadoop. We have implemented a graph-processing framework that is launched as a typical Hadoop job to leverage existing Hadoop infrastructure, such as Amazon's EC2. Giraph builds upon the graph-oriented nature of Pregel but additionally adds fault-tolerance to the coordinator process with the use of ZooKeeper as its centralized coordination service.</p>
-
- <p>Giraph follows the <a href="http://en.wikipedia.org/wiki/Bulk_synchronous_parallel">bulk-synchronous parallel model</a> relative to graphs where vertices can send messages to other vertices during a given superstep. Checkpoints are initiated by the Giraph infrastructure at user-defined intervals and are used for automatic application restarts when any worker in the application fails. Any worker in the application can act as the application coordinator and one will automatically take over if the current application coordinator fails.</p>
-
- </section>
- <section name="News">
- <!-- TODO: remove 'incubator/' from URL when Apache distribution supports it. -->
- <ul>
- <li><strong>April 9, 2013: Giraph 1.0 is near a release.</strong> The Giraph PPMC is excited to announce that version 1.0 is near a release. We will hopefully complete this release in about a week from now.
- </li>
- <li><strong>February 6, 2012: Giraph 0.1-incubating released.</strong> The Giraph PPMC is excited to announce that version 0.1 has been released. Grab a copy of the release <a href="http://www.apache.org/dyn/closer.cgi/incubator/giraph/">here</a>.
- </li>
- </ul>
- </section>
- <section name="Supported versions of Apache Hadoop">
- <p> Hadoop versions for use with Giraph:
- <ul>
- <li>YARN version: Apache Hadoop 2.0.3-alpha, other versions may work as well</li>
- <li>Secure Hadoop versions: Apache Hadoop 0.20.203, 0.20.204, other secure versions may work as well</li>
- <li>Unsecure Hadoop versions: Apache Hadoop 0.20.1, 0.20.2, 0.20.3. While we provide support for unsecure Hadoop with the maven profile 'hadoop_non_secure', we have been primarily focusing on secure Hadoop releases at this time.</li>
- <li>Other distributions that included Apache Hadoop reported to work include: Cloudera CDH3u0, CDH3u1</li>
- </ul>
- </p>
- </section>
- <section name="Getting involved">
- <p>Giraph is a new project and we're looking to quickly build a community of users and contributors. All types of help is appreciated: contributing patches, writing documentation, posing and answering questions on the mailing list, even <a href="https://issues.apache.org/jira/browse/GIRAPH-4">graphic design</a>. Here's how to get involved with Giraph (or any Apache project):</p>
- <ul>
- <li>Subscribe to the <a href="mail-lists.html">mailing lists</a>, particularly the user and dev list, and follow their activity for a while to get a feel for the state of the project and what the community is working on.</li>
- <li>Browse through <a href="issue-tracking.html">Giraph's JIRA</a>, our issue tracking system, to find issues you may be interested in working on. To help new contributors pitch in quickly, we maintain a <a href="http://bit.ly/newbie_apache_giraph_issues">set of JIRAs</a> that focus on getting new contributors started with the mechanics of generating a patch — downloading the source, changing a couple lines, creating a patch, verifying its correctness, uploading it to JIRA and working with the community — rather that deep technical issues within Giraph itself. These are good issues with which to join the community. See <a href="#Generatingpatches">below</a> for detailed instructions on creating patches.</li>
- <li>Try out the examples and play with Giraph on your cluster. Be sure to ask questions on the mailing list or open new JIRAs if you run into issues with your particular configuration.</li>
- </ul>
- </section>
- <section name="Releases">
- <!-- TODO: remove 'incubator/' from URL when Apache distribution supports it. -->
- <p>Official releases of Giraph may be downloaded from an <a href="http://www.apache.org/dyn/closer.cgi/incubator/giraph/">Apache mirror</a>. Soon we will also publish our release artifacts to Apache's Maven repositories to make it easier to include Giraph in your projects.</p>
- </section>
- <section name="Building and testing">
- <p>You will need the following:</p>
- <ul>
- <li>Java 1.6</li>
- <li>Maven 3 or higher. Giraph uses the <a href="http://sonatype.github.com/munge-maven-plugin/">munge plugin</a>, which requires Maven 3, to support multiple versions of Hadoop. Also, the web site plugin requires Maven 3.</li>
- </ul>
-
- <p>Use the maven commands with secure Hadoop to:
- <ul>
- <li>compile (i.e <tt>mvn compile</tt>)</li>
- <li>package (i.e. <tt>mvn package</tt>)</li>
- <li>test (i.e. <tt>mvn test</tt>) For testing, one can submit the test to a running Hadoop instance (i.e. <tt>mvn test -Dprop.mapred.job.tracker=localhost:50300</tt>)</li>
- </ul>
- For the non-secure versions of Hadoop, run the maven commands with the
- additional argument <tt>-Dhadoop=non_secure</tt> to enable the maven profile
- <tt>hadoop_non_secure</tt>. An example compilation command is
- <tt>mvn -Dhadoop=non_secure compile</tt>.</p>
- </section>
- <section name="Notes">
- Counter limit: In Hadoop 0.20.203.0 onwards, there is a limit on the number of counters one can use, which is set to 120 by default. This limit restricts the number of iterations/supersteps possible in Giraph. This limit can be increased by setting a parameter <tt>mapreduce.job.counters.limit</tt> in job tracker's config file mapred-site.xml.
- </section>
+
+ <section name="Distributed graph processing with Giraph">
+<p><i>Giraph</i> (pronounced like the animal giraffe) is an iterative graph processing system. As an exemple use case, Facebook uses Giraph to analyze its social graph in production. Giraph is motivated by the Turing Award winning [<a href="#turing">1</a>] elegant Bulk Synchronous Parallel (BSP) model of distributed computation by Valiant [<a href="#bsp">2</a>], and the Pregel graph processing system [<a href="#pregel">3</a>] from Google that evidenced that an appropriately extended BSP model is useful for large-scale graph computation. Giraph distinguishes itself by being an open source, scalable graph processing platform with a growing community of users worldwide. You are welcome to explore the <i>User Docs</i> menu above that explain how to process graphs with Giraph.</p>
+</section>
+
+
+<section name="News">
+
+<ul>
+ <li>Official releases of Giraph may be downloaded from an <a href="http://www.apache.org/dyn/closer.cgi/incubator/giraph/">Apache mirror</a>. Soon we will also publish our release artifacts to Apache's Maven repositories to make it easier to include Giraph in your projects.</li>
+ <li><strong>April 9, 2013: Giraph 1.0 is near a release.</strong> The Giraph PPMC is excited to announce that version 1.0 is near a release. We will hopefully complete this release in about a week from now.</li>
+ <li><strong>February 6, 2012: Giraph 0.1-incubating released.</strong> The Giraph PPMC is excited to announce that version 0.1 has been released. Grab a copy of the release <a href="http://www.apache.org/dyn/closer.cgi/incubator/giraph/">here</a>.</li>
+</ul>
+
+</section>
+
+<section name="Getting involved">
+
+<p>Giraph is a new project and we're looking to quickly build a community of users and contributors. All types of help is appreciated: contributing patches, writing documentation, posing and answering questions on the mailing list, even <a href="https://issues.apache.org/jira/browse/GIRAPH-4">graphic design</a>. Here's how to get involved with Giraph (or any Apache project):</p>
+
+<ul>
+ <li>Subscribe to the <a href="mail-lists.html">mailing lists</a>, particularly the user and dev list, and follow their activity for a while to get a feel for the state of the project and what the community is working on.</li>
+ <li>Browse through <a href="issue-tracking.html">Giraph's JIRA</a>, our issue tracking system, to find issues you may be interested in working on. To help new contributors pitch in quickly, we maintain a <a href="http://bit.ly/newbie_apache_giraph_issues">set of JIRAs</a> that focus on getting new contributors started with the mechanics of generating a patch — downloading the source, changing a couple of lines, creating a patch, verifying its correctness, uploading it to JIRA and working with the community — rather than deep technical issues within Giraph itself. These are good issues with which to join the community. Take a look at the section on <a href="generating_patches.html">generating patches</a> for detailed instructions on creating patches.</li>
+ <li>Try out the examples and play with Giraph on your cluster. Be sure to ask questions on the mailing list or open new JIRAs if you run into issues with your particular configuration.</li>
+</ul>
+
+</section>
+
+
+<section name="References">
+
+<ol>
+<li id="turing">Leslie Valiant: The 2010 A.M. Turing Award (<a href="http://amturing.acm.org/award_winners/valiant_2612174.cfm">link</a>)</li>
+<li id="bsp">Leslie Valiant: A bridging model for parallel computation. Communications of the ACM, Vol. 33(8) (1990) pp. 103-111 (<a href="http://dl.acm.org/citation.cfm?id=79173.79181">link</a>)</li>
+<li id="pregel">Grzegorz Malewicz, Matthew H. Austern, Aart J.C Bik, James C. Dehnert, Ilan Horn, Naty Leiser, Grzegorz Czajkowski: Pregel: a system for large-scale graph processing. ACM SIGMOD International Conference on Management of Data (2010) pp. 135-146 (<a href="http://dl.acm.org/citation.cfm?id=1807184">link</a>)</li>
+</ol>
+
+</section>
+
</body>
</document>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/intro.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/intro.xml b/src/site/xdoc/intro.xml
new file mode 100644
index 0000000..fc7cc1e
--- /dev/null
+++ b/src/site/xdoc/intro.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+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.
+-->
+
+<document xmlns="http://maven.apache.org/XDOC/2.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
+ <properties>
+ <title>Introduction to Giraph</title>
+ </properties>
+
+ <body>
+
+ <section name="Introduction">
+<p>Giraph is an iterative graph processing system.</p>
+
+<p>The input to a Giraph computation is a graph composed of vertices and directed edges, see Figure <a href="#Figure1">1</a>. For example vertices can represent people, and edges friend requests. Each vertex stores a <i>value</i>, so does each edge. The input, thus, not only determines the graph topology, but also the initial values of vertices and edges.</p>
+
+<p>As an example, consider a computation that finds the distance from a predetermined <i>source person s</i> to any person in the social graph. In this computation, the value of an edge is a floating point number denoting distance between adjacent people. The value of a vertex v is also a floating point number, representing an upper bound on the distance along a shortest path from the predetermined vertex s to v. The initial value of the predetermined source vertex s is 0, and the initial value for any other vertex is infinity.</p>
+
+<p>
+<table border="0" class="image" align="center" width="60%">
+<tr><td><img src="images/ExampleSSSP.svg" /></td></tr>
+<tr><td class="caption" id="Figure1">Figure 1: An illustration of an execution of a single source shortest paths algorithm in Giraph. The input is a chain graph with three vertices (black) and two edges (green). The values of edges are 1 and 3 respectively. The algorithm computes distances from the leftmost vertex. The initial values of vertices are 0, ∞ and ∞ (top row). Distance upper bounds are sent as messages (blue), resulting in updates to vertex values (successive rows going down). The execution lasts three supersteps (separated by red lines).
+</td></tr>
+</table>
+</p>
+
+<p></p>
+
+<p>Computation proceeds as a sequence of iterations, called <i>supersteps</i> in BSP. Initially, every vertex is <i>active</i>. In each superstep each active vertex invokes the <i>Compute method</i> provided by the user. The method implements the graph algorithm that will be executed on the input graph. Intuitively, you should think like a vertex when designing a Giraph algorithm. The Compute method:</p>
+<p><ul>
+<li>receives messages sent to the vertex in the previous superstep,</li>
+<li>computes using the messages, and the vertex and outgoing edge values, which may result in modifications to the values, and</li>
+<li>may send messages to other vertices.</li>
+</ul></p>
+<p>The Compute method does not have direct access to the values of other vertices and their outgoing edges. Inter-vertex communication occurs by sending messages.</p>
+
+<p>In our single-source shortest paths example, a Compute method will: (1) find the minimum value arriving on any message, (2) if that value is less than the current value of the vertex, then (3) the minimum will be adopted as the vertex value, and (4) the value plus the edge value will be sent along every outgoing edge. See a simplified code in Figure <a href="#Figure2">2</a> and a complete Java implementation <a href="https://github.com/apache/giraph/blob/trunk/giraph-examples/src/main/java/org/apache/giraph/examples/SimpleShortestPathsVertex.java">here</a>.</p>
+
+<p>
+<table border="0" class="image" align="center" width="70%">
+<tr><td>
+<source>
+ public void compute(Iterable<DoubleWritable> messages) {
+ double minDist = Double.MAX_VALUE;
+ for (DoubleWritable message : messages) {
+ minDist = Math.min(minDist, message.get());
+ }
+ if (minDist < getValue().get()) {
+ setValue(new DoubleWritable(minDist));
+ for (Edge<LongWritable, FloatWritable> edge : getEdges()) {
+ double distance = minDist + edge.getValue().get();
+ sendMessage(edge.getTargetVertexId(), new DoubleWritable(distance));
+ }
+ }
+ voteToHalt();
+ }
+</source></td></tr>
+<tr><td class="caption" id="Figure2">Figure 2: The Compute method for a single source shortest paths computation. Each vertex in the graph executes this method at each superstep. The method computes a minimum distance arriving on messages and can send distances along each edge.
+</td></tr>
+</table>
+</p>
+
+<p></p>
+
+<p>There is a <i>barrier</i> between consecutive supersteps. By this we mean that: (1) the messages sent in any current superstep get delivered to the destination vertices only in the next superstep, and (2) vertices start computing the next superstep after every vertex has completed computing the current superstep.</p>
+
+<p>The graph can be mutated during computation by adding or removing vertices or edges. Our example shortest paths algorithm does not mutate the graph.</p>
+
+<p>Values are retained across barriers. That is, the value of any vertex or edge at the beginning of a superstep is equal to the corresponding value at the end of the previous superstep, when graph topology is not mutated. For example, when a vertex has set the distance upper bound to D, then at the beginning of the next superstep the distance upper bound will still be equal D. Of course the vertex can modify the value of the vertex and of the outgoing edges during any superstep.</p>
+
+<p>Any vertex can stop computing after any superstep. The vertex simply declares that it does not want to be active anymore. However, any incoming message will make the vertex active again.</p>
+
+<p>The computation halts after the vertices have voted to halt and there are no messages in flight. Each vertex outputs some local information, which usually amounts to the final vertex value.</p>
+ </section>
+
+ </body>
+</document>
http://git-wip-us.apache.org/repos/asf/giraph/blob/e495238b/src/site/xdoc/io.xml
----------------------------------------------------------------------
diff --git a/src/site/xdoc/io.xml b/src/site/xdoc/io.xml
index 76f610b..38c74e0 100644
--- a/src/site/xdoc/io.xml
+++ b/src/site/xdoc/io.xml
@@ -22,7 +22,7 @@
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">
<properties>
- <title>Input/output in Giraph</title>
+ <title>Input/Output in Giraph</title>
</properties>
<body>