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Posted to commits@samza.apache.org by ya...@apache.org on 2014/12/05 19:52:35 UTC
svn commit: r1643389 [25/27] - in /incubator/samza/site: ./ archive/
community/ contribute/ img/0.8/ img/0.8/learn/ img/0.8/learn/documentation/
img/0.8/learn/documentation/comparisons/
img/0.8/learn/documentation/container/ img/0.8/learn/documentation...
Added: incubator/samza/site/learn/documentation/0.8/jobs/configuration.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/configuration.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/configuration.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/configuration.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,235 @@
+<!DOCTYPE html>
+<!--
+ 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.
+-->
+<html lang="en">
+ <head>
+ <meta charset="utf-8">
+ <title>Samza - Configuration</title>
+ <link href='/css/ropa-sans.css' rel='stylesheet' type='text/css'/>
+ <link href="/css/bootstrap.min.css" rel="stylesheet"/>
+ <link href="/css/font-awesome.min.css" rel="stylesheet"/>
+ <link href="/css/main.css" rel="stylesheet"/>
+ <link href="/css/syntax.css" rel="stylesheet"/>
+ <link rel="icon" type="image/png" href="/img/samza-icon.png">
+ <script src="/js/jquery-1.11.1.min.js"></script>
+ </head>
+ <body>
+ <div class="wrapper">
+ <div class="wrapper-content">
+
+ <div class="masthead">
+ <div class="container">
+ <div class="masthead-logo">
+ <a href="/" class="logo">samza</a>
+ </div>
+ <div class="masthead-icons">
+ <div class="pull-right">
+ <a href="/startup/download"><i class="fa fa-arrow-circle-o-down masthead-icon"></i></a>
+ <a href="https://git-wip-us.apache.org/repos/asf?p=incubator-samza.git;a=tree" target="_blank"><i class="fa fa-code masthead-icon" style="font-weight: bold;"></i></a>
+ <a href="https://twitter.com/samzastream" target="_blank"><i class="fa fa-twitter masthead-icon"></i></a>
+ <!-- this icon only shows in versioned pages -->
+
+
+
+
+ <a href="http://samza.incubator.apache.org/learn/documentation/latest/jobs/configuration.html"><i id="switch-version-button"></i></a>
+ <!-- links for the navigation bar -->
+
+
+ </div>
+ </div>
+ </div><!-- /.container -->
+ </div>
+
+ <div class="container">
+ <div class="menu">
+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
+ <li><a href="/startup/download">Download</a></li>
+ </ul>
+
+ <h1><i class="fa fa-book"></i> Learn</h1>
+ <ul>
+ <li><a href="/learn/documentation/0.8">Documentation</a></li>
+ <li><a href="/learn/documentation/0.8/jobs/configuration-table.html">Configuration</a></li>
+ <li><a href="/learn/documentation/0.8/api/javadocs/">Javadocs</a></li>
+ <li><a href="/learn/tutorials/0.8">Tutorials</a></li>
+ <li><a href="http://wiki.apache.org/samza/FAQ">FAQ</a></li>
+ <li><a href="http://wiki.apache.org/samza">Wiki</a></li>
+ <li><a href="http://wiki.apache.org/samza/PapersAndTalks">Papers & Talks</a></li>
+ <li><a href="http://blogs.apache.org/samza">Blog</a></li>
+ </ul>
+
+ <h1><i class="fa fa-comments"></i> Community</h1>
+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
+ <li><a href="/community/irc.html">IRC</a></li>
+ <li><a href="https://issues.apache.org/jira/browse/SAMZA">Bugs</a></li>
+ <li><a href="http://wiki.apache.org/samza/PoweredBy">Powered by</a></li>
+ <li><a href="http://wiki.apache.org/samza/Ecosystem">Ecosystem</a></li>
+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
+ <h1><i class="fa fa-code"></i> Contribute</h1>
+ <ul>
+ <li><a href="/contribute/rules.html">Rules</a></li>
+ <li><a href="/contribute/coding-guide.html">Coding Guide</a></li>
+ <li><a href="/contribute/projects.html">Projects</a></li>
+ <li><a href="/contribute/design-documents.html">Design Documents</a></li>
+ <li><a href="/contribute/code.html">Code</a></li>
+ <li><a href="https://reviews.apache.org/groups/samza">Review Board</a></li>
+ <li><a href="/contribute/tests.html">Tests</a></li>
+ <li><a href="/contribute/disclaimer.html">Disclaimer</a></li>
+ </ul>
+
+ <h1><i class="fa fa-history"></i> Archive</h1>
+ <ul>
+ <li><a href="/archive/index.html#latest">latest</a></li>
+ <li><a href="/archive/index.html#08">0.8</a></li>
+ <li><a href="/archive/index.html#07">0.7</a></li>
+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>Configuration</h2>
+
+<!--
+ 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.
+-->
+
+<p>All Samza jobs have a configuration file that defines the job. A very basic configuration file looks like this:</p>
+
+<div class="highlight"><pre><code class="jproperties"><span class="c"># Job</span>
+<span class="na">job.factory.class</span><span class="o">=</span><span class="s">org.apache.samza.job.local.ThreadJobFactory</span>
+<span class="na">job.name</span><span class="o">=</span><span class="s">hello-world</span>
+
+<span class="c"># Task</span>
+<span class="na">task.class</span><span class="o">=</span><span class="s">samza.task.example.MyJavaStreamerTask</span>
+<span class="na">task.inputs</span><span class="o">=</span><span class="s">example-system.example-stream</span>
+
+<span class="c"># Serializers</span>
+<span class="na">serializers.registry.json.class</span><span class="o">=</span><span class="s">org.apache.samza.serializers.JsonSerdeFactory</span>
+<span class="na">serializers.registry.string.class</span><span class="o">=</span><span class="s">org.apache.samza.serializers.StringSerdeFactory</span>
+
+<span class="c"># Systems</span>
+<span class="na">systems.example-system.samza.factory</span><span class="o">=</span><span class="s">samza.stream.example.ExampleConsumerFactory</span>
+<span class="na">systems.example-system.samza.key.serde</span><span class="o">=</span><span class="s">string</span>
+<span class="na">systems.example-system.samza.msg.serde</span><span class="o">=</span><span class="s">json</span></code></pre></div>
+
+<p>There are four major sections to a configuration file:</p>
+
+<ol>
+<li>The job section defines things like the name of the job, and whether to use the YarnJobFactory or ProcessJobFactory/ThreadJobFactory (See the job.factory.class property in <a href="configuration-table.html">Configuration Table</a>).</li>
+<li>The task section is where you specify the class name for your <a href="../api/overview.html">StreamTask</a>. It’s also where you define what the <a href="../container/streams.html">input streams</a> are for your task.</li>
+<li>The serializers section defines the classes of the <a href="../container/serialization.html">serdes</a> used for serialization and deserialization of specific objects that are received and sent along different streams.</li>
+<li>The system section defines systems that your StreamTask can read from along with the types of serdes used for sending keys and messages from that system. Usually, you’ll define a Kafka system, if you’re reading from Kafka, although you can also specify your own self-implemented Samza-compatible systems. See the <a href="/startup/hello-samza/0.8">hello-samza example project</a>’s Wikipedia system for a good example of a self-implemented system.</li>
+</ol>
+
+<h3 id="required-configuration">Required Configuration</h3>
+
+<p>Configuration keys that absolutely must be defined for a Samza job are:</p>
+
+<ul>
+<li><code>job.factory.class</code></li>
+<li><code>job.name</code></li>
+<li><code>task.class</code></li>
+<li><code>task.inputs</code></li>
+</ul>
+
+<h3 id="configuration-keys">Configuration Keys</h3>
+
+<p>A complete list of configuration keys can be found on the <a href="configuration-table.html">Configuration Table</a> page.</p>
+
+<h2 id="packaging-»"><a href="packaging.html">Packaging »</a></h2>
+
+
+ </div>
+ </div>
+
+ </div><!-- /.wrapper-content -->
+ </div><!-- /.wrapper -->
+
+ <div class="footer">
+ <div class="container">
+ <!-- nothing for now. -->
+ </div>
+ </div>
+
+
+ <script>
+ $( document ).ready(function() {
+ if ( $.fn.urlExists( "/learn/documentation/latest/jobs/configuration.html" ) ) {
+ $("#switch-version-button").addClass("fa fa-history masthead-icon");
+ }
+ });
+
+ /* a function to test whether the url exists or not */
+ (function( $ ) {
+ $.fn.urlExists = function(url) {
+ var http = new XMLHttpRequest();
+ http.open('HEAD', url, false);
+ http.send();
+ return http.status != 404;
+ };
+ }( jQuery ));
+ </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-43122768-1', 'apache.org');
+ ga('send', 'pageview');
+
+ </script>
+ </body>
+</html>
Added: incubator/samza/site/learn/documentation/0.8/jobs/job-runner.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/job-runner.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/job-runner.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/job-runner.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,224 @@
+<!DOCTYPE html>
+<!--
+ 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.
+-->
+<html lang="en">
+ <head>
+ <meta charset="utf-8">
+ <title>Samza - JobRunner</title>
+ <link href='/css/ropa-sans.css' rel='stylesheet' type='text/css'/>
+ <link href="/css/bootstrap.min.css" rel="stylesheet"/>
+ <link href="/css/font-awesome.min.css" rel="stylesheet"/>
+ <link href="/css/main.css" rel="stylesheet"/>
+ <link href="/css/syntax.css" rel="stylesheet"/>
+ <link rel="icon" type="image/png" href="/img/samza-icon.png">
+ <script src="/js/jquery-1.11.1.min.js"></script>
+ </head>
+ <body>
+ <div class="wrapper">
+ <div class="wrapper-content">
+
+ <div class="masthead">
+ <div class="container">
+ <div class="masthead-logo">
+ <a href="/" class="logo">samza</a>
+ </div>
+ <div class="masthead-icons">
+ <div class="pull-right">
+ <a href="/startup/download"><i class="fa fa-arrow-circle-o-down masthead-icon"></i></a>
+ <a href="https://git-wip-us.apache.org/repos/asf?p=incubator-samza.git;a=tree" target="_blank"><i class="fa fa-code masthead-icon" style="font-weight: bold;"></i></a>
+ <a href="https://twitter.com/samzastream" target="_blank"><i class="fa fa-twitter masthead-icon"></i></a>
+ <!-- this icon only shows in versioned pages -->
+
+
+
+
+ <a href="http://samza.incubator.apache.org/learn/documentation/latest/jobs/job-runner.html"><i id="switch-version-button"></i></a>
+ <!-- links for the navigation bar -->
+
+
+ </div>
+ </div>
+ </div><!-- /.container -->
+ </div>
+
+ <div class="container">
+ <div class="menu">
+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
+ <li><a href="/startup/download">Download</a></li>
+ </ul>
+
+ <h1><i class="fa fa-book"></i> Learn</h1>
+ <ul>
+ <li><a href="/learn/documentation/0.8">Documentation</a></li>
+ <li><a href="/learn/documentation/0.8/jobs/configuration-table.html">Configuration</a></li>
+ <li><a href="/learn/documentation/0.8/api/javadocs/">Javadocs</a></li>
+ <li><a href="/learn/tutorials/0.8">Tutorials</a></li>
+ <li><a href="http://wiki.apache.org/samza/FAQ">FAQ</a></li>
+ <li><a href="http://wiki.apache.org/samza">Wiki</a></li>
+ <li><a href="http://wiki.apache.org/samza/PapersAndTalks">Papers & Talks</a></li>
+ <li><a href="http://blogs.apache.org/samza">Blog</a></li>
+ </ul>
+
+ <h1><i class="fa fa-comments"></i> Community</h1>
+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
+ <li><a href="/community/irc.html">IRC</a></li>
+ <li><a href="https://issues.apache.org/jira/browse/SAMZA">Bugs</a></li>
+ <li><a href="http://wiki.apache.org/samza/PoweredBy">Powered by</a></li>
+ <li><a href="http://wiki.apache.org/samza/Ecosystem">Ecosystem</a></li>
+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
+ <h1><i class="fa fa-code"></i> Contribute</h1>
+ <ul>
+ <li><a href="/contribute/rules.html">Rules</a></li>
+ <li><a href="/contribute/coding-guide.html">Coding Guide</a></li>
+ <li><a href="/contribute/projects.html">Projects</a></li>
+ <li><a href="/contribute/design-documents.html">Design Documents</a></li>
+ <li><a href="/contribute/code.html">Code</a></li>
+ <li><a href="https://reviews.apache.org/groups/samza">Review Board</a></li>
+ <li><a href="/contribute/tests.html">Tests</a></li>
+ <li><a href="/contribute/disclaimer.html">Disclaimer</a></li>
+ </ul>
+
+ <h1><i class="fa fa-history"></i> Archive</h1>
+ <ul>
+ <li><a href="/archive/index.html#latest">latest</a></li>
+ <li><a href="/archive/index.html#08">0.8</a></li>
+ <li><a href="/archive/index.html#07">0.7</a></li>
+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>JobRunner</h2>
+
+<!--
+ 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.
+-->
+
+<p>Samza jobs are started using a script called run-job.sh.</p>
+
+<div class="highlight"><pre><code class="bash">samza-example/target/bin/run-job.sh <span class="se">\</span>
+ --config-factory<span class="o">=</span>samza.config.factories.PropertiesConfigFactory <span class="se">\</span>
+ --config-path<span class="o">=</span>file://<span class="nv">$PWD</span>/config/hello-world.properties</code></pre></div>
+
+<p>You provide two parameters to the run-job.sh script. One is the config location, and the other is a factory class that is used to read your configuration file. The run-job.sh script is actually executing a Samza class called JobRunner. The JobRunner uses your ConfigFactory to get a Config object from the config path.</p>
+
+<div class="highlight"><pre><code class="java"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">ConfigFactory</span> <span class="o">{</span>
+ <span class="n">Config</span> <span class="nf">getConfig</span><span class="o">(</span><span class="n">URI</span> <span class="n">configUri</span><span class="o">);</span>
+<span class="o">}</span></code></pre></div>
+
+<p>The Config object is just a wrapper around Map<String, String>, with some nice helper methods. Out of the box, Samza ships with the PropertiesConfigFactory, but developers can implement any kind of ConfigFactory they wish.</p>
+
+<p>Once the JobRunner gets your configuration, it gives your configuration to the StreamJobFactory class defined by the “job.factory” property. Samza ships with three job factory implementations: ThreadJobFactory, ProcessJobFactory and YarnJobFactory. The StreamJobFactory’s responsibility is to give the JobRunner a job that it can run.</p>
+
+<div class="highlight"><pre><code class="java"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">StreamJob</span> <span class="o">{</span>
+ <span class="n">StreamJob</span> <span class="nf">submit</span><span class="o">();</span>
+
+ <span class="n">StreamJob</span> <span class="nf">kill</span><span class="o">();</span>
+
+ <span class="n">ApplicationStatus</span> <span class="nf">waitForFinish</span><span class="o">(</span><span class="kt">long</span> <span class="n">timeoutMs</span><span class="o">);</span>
+
+ <span class="n">ApplicationStatus</span> <span class="nf">waitForStatus</span><span class="o">(</span><span class="n">ApplicationStatus</span> <span class="n">status</span><span class="o">,</span> <span class="kt">long</span> <span class="n">timeoutMs</span><span class="o">);</span>
+
+ <span class="n">ApplicationStatus</span> <span class="nf">getStatus</span><span class="o">();</span>
+<span class="o">}</span></code></pre></div>
+
+<p>Once the JobRunner gets a job, it calls submit() on the job. This method is what tells the StreamJob implementation to start the SamzaContainer. In the case of LocalJobRunner, it uses a run-container.sh script to execute the SamzaContainer in a separate process, which will start one SamzaContainer locally on the machine that you ran run-job.sh on.</p>
+
+<p>This flow differs slightly when you use YARN, but we’ll get to that later.</p>
+
+<h2 id="configuration-»"><a href="configuration.html">Configuration »</a></h2>
+
+
+ </div>
+ </div>
+
+ </div><!-- /.wrapper-content -->
+ </div><!-- /.wrapper -->
+
+ <div class="footer">
+ <div class="container">
+ <!-- nothing for now. -->
+ </div>
+ </div>
+
+
+ <script>
+ $( document ).ready(function() {
+ if ( $.fn.urlExists( "/learn/documentation/latest/jobs/job-runner.html" ) ) {
+ $("#switch-version-button").addClass("fa fa-history masthead-icon");
+ }
+ });
+
+ /* a function to test whether the url exists or not */
+ (function( $ ) {
+ $.fn.urlExists = function(url) {
+ var http = new XMLHttpRequest();
+ http.open('HEAD', url, false);
+ http.send();
+ return http.status != 404;
+ };
+ }( jQuery ));
+ </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-43122768-1', 'apache.org');
+ ga('send', 'pageview');
+
+ </script>
+ </body>
+</html>
Added: incubator/samza/site/learn/documentation/0.8/jobs/logging.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/logging.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/logging.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/logging.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,268 @@
+<!DOCTYPE html>
+<!--
+ 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.
+-->
+<html lang="en">
+ <head>
+ <meta charset="utf-8">
+ <title>Samza - Logging</title>
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+ </div><!-- /.container -->
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+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
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+
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+ </ul>
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+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
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+ <li><a href="http://wiki.apache.org/samza/PoweredBy">Powered by</a></li>
+ <li><a href="http://wiki.apache.org/samza/Ecosystem">Ecosystem</a></li>
+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
+ <h1><i class="fa fa-code"></i> Contribute</h1>
+ <ul>
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+ <li><a href="/contribute/tests.html">Tests</a></li>
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+ </ul>
+
+ <h1><i class="fa fa-history"></i> Archive</h1>
+ <ul>
+ <li><a href="/archive/index.html#latest">latest</a></li>
+ <li><a href="/archive/index.html#08">0.8</a></li>
+ <li><a href="/archive/index.html#07">0.7</a></li>
+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>Logging</h2>
+
+<!--
+ 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.
+-->
+
+<p>Samza uses <a href="http://www.slf4j.org/">SLF4J</a> for all of its logging. By default, Samza only depends on slf4j-api, so you must add an SLF4J runtime dependency to your Samza packages for whichever underlying logging platform you wish to use.</p>
+
+<h3 id="log4j">Log4j</h3>
+
+<p>The <a href="/startup/hello-samza/0.8">hello-samza</a> project shows how to use <a href="http://logging.apache.org/log4j/1.2/">log4j</a> with Samza. To turn on log4j logging, you just need to make sure slf4j-log4j12 is in your SamzaContainer’s classpath. In Maven, this can be done by adding the following dependency to your Samza package project.</p>
+
+<div class="highlight"><pre><code class="xml"><span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>org.slf4j<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>slf4j-log4j12<span class="nt"></artifactId></span>
+ <span class="nt"><scope></span>runtime<span class="nt"></scope></span>
+ <span class="nt"><version></span>1.6.2<span class="nt"></version></span>
+<span class="nt"></dependency></span></code></pre></div>
+
+<p>If you’re not using Maven, just make sure that slf4j-log4j12 ends up in your Samza package’s lib directory.</p>
+
+<h4 id="log4j-configuration">Log4j configuration</h4>
+
+<p>Samza’s <a href="packaging.html">run-class.sh</a> script will automatically set the following setting if log4j.xml exists in your <a href="packaging.html">Samza package’s</a> lib directory.</p>
+
+<div class="highlight"><pre><code class="bash">-Dlog4j.configuration<span class="o">=</span>file:<span class="nv">$base_dir</span>/lib/log4j.xml</code></pre></div>
+
+<p>The <a href="packaging.html">run-class.sh</a> script will also set the following Java system properties:</p>
+
+<div class="highlight"><pre><code class="bash">-Dsamza.log.dir<span class="o">=</span><span class="nv">$SAMZA_LOG_DIR</span> -Dsamza.container.name<span class="o">=</span><span class="nv">$SAMZA_CONTAINER_NAME</span></code></pre></div>
+
+<p>These settings are very useful if you’re using a file-based appender. For example, you can use a daily rolling appender by configuring log4j.xml like this:</p>
+
+<div class="highlight"><pre><code class="xml"><span class="nt"><appender</span> <span class="na">name=</span><span class="s">"RollingAppender"</span> <span class="na">class=</span><span class="s">"org.apache.log4j.DailyRollingFileAppender"</span><span class="nt">></span>
+ <span class="nt"><param</span> <span class="na">name=</span><span class="s">"File"</span> <span class="na">value=</span><span class="s">"${samza.log.dir}/${samza.container.name}.log"</span> <span class="nt">/></span>
+ <span class="nt"><param</span> <span class="na">name=</span><span class="s">"DatePattern"</span> <span class="na">value=</span><span class="s">"'.'yyyy-MM-dd"</span> <span class="nt">/></span>
+ <span class="nt"><layout</span> <span class="na">class=</span><span class="s">"org.apache.log4j.PatternLayout"</span><span class="nt">></span>
+ <span class="nt"><param</span> <span class="na">name=</span><span class="s">"ConversionPattern"</span> <span class="na">value=</span><span class="s">"%d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n"</span> <span class="nt">/></span>
+ <span class="nt"></layout></span>
+<span class="nt"></appender></span></code></pre></div>
+
+<p>Setting up a file-based appender is recommended as a better alternative to using standard out. Standard out log files (see below) don’t roll, and can get quite large if used for logging.</p>
+
+<h4 id="changing-log-levels">Changing log levels</h4>
+
+<p>Sometimes it’s desirable to change the Log4J log level from <code>INFO</code> to <code>DEBUG</code> at runtime so that a developer can enable more logging for a Samza container that’s exhibiting undesirable behavior. Samza provides a Log4j class called JmxAppender, which will allow you to dynamically modify log levels at runtime. The JmxAppender class is located in the samza-log4j package, and can be turned on by first adding a runtime dependency to the samza-log4j package:</p>
+
+<div class="highlight"><pre><code class="xml"><span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>org.apache.samza<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>samza-log4j<span class="nt"></artifactId></span>
+ <span class="nt"><scope></span>runtime<span class="nt"></scope></span>
+ <span class="nt"><version></span>${samza.version}<span class="nt"></version></span>
+<span class="nt"></dependency></span></code></pre></div>
+
+<p>And then updating your log4j.xml to include the appender:</p>
+
+<div class="highlight"><pre><code class="xml"><span class="nt"><appender</span> <span class="na">name=</span><span class="s">"jmx"</span> <span class="na">class=</span><span class="s">"org.apache.samza.logging.log4j.JmxAppender"</span> <span class="nt">/></span></code></pre></div>
+
+<h3 id="log-directory">Log Directory</h3>
+
+<p>Samza will look for the <code>SAMZA_LOG_DIR</code> environment variable when it executes. If this variable is defined, all logs will be written to this directory. If the environment variable is empty, or not defined, then Samza will use <code>$base_dir</code>, which is the directory one level up from Samza’s <a href="packaging.html">run-class.sh</a> script. This environment variable can also be referenced inside log4j.xml files (see above).</p>
+
+<h3 id="garbage-collection-logging">Garbage Collection Logging</h3>
+
+<p>Samza will automatically set the following garbage collection logging setting, and will output it to <code>$SAMZA_LOG_DIR/gc.log</code>.</p>
+
+<div class="highlight"><pre><code class="bash">-XX:+PrintGCDateStamps -Xloggc:<span class="nv">$SAMZA_LOG_DIR</span>/gc.log</code></pre></div>
+
+<h4 id="rotation">Rotation</h4>
+
+<p>In older versions of Java, it is impossible to have GC logs roll over based on time or size without the use of a secondary tool. This means that your GC logs will never be deleted until a Samza job ceases to run. As of <a href="http://www.oracle.com/technetwork/java/javase/2col/6u34-bugfixes-1733379.html">Java 6 Update 34</a>, and <a href="http://www.oracle.com/technetwork/java/javase/7u2-relnotes-1394228.html">Java 7 Update 2</a>, <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6941923">new GC command line switches</a> have been added to support this functionality. If GC log file rotation is supported by the JVM, Samza will also set:</p>
+
+<div class="highlight"><pre><code class="bash">-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles<span class="o">=</span>10 -XX:GCLogFileSize<span class="o">=</span>10241024</code></pre></div>
+
+<h3 id="yarn">YARN</h3>
+
+<p>When a Samza job executes on a YARN grid, the <code>$SAMZA_LOG_DIR</code> environment variable will point to a directory that is secured such that only the user executing the Samza job can read and write to it, if YARN is <a href="http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/ClusterSetup.html">securely configured</a>.</p>
+
+<h4 id="stdout">STDOUT</h4>
+
+<p>Samza’s <a href="../yarn/application-master.html">ApplicationMaster</a> pipes all STDOUT and STDERR output to logs/stdout and logs/stderr, respectively. These files are never rotated.</p>
+
+<h2 id="reprocessing-»"><a href="reprocessing.html">Reprocessing »</a></h2>
+
+
+ </div>
+ </div>
+
+ </div><!-- /.wrapper-content -->
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+ <!-- nothing for now. -->
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+
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+ <script>
+ $( document ).ready(function() {
+ if ( $.fn.urlExists( "/learn/documentation/latest/jobs/logging.html" ) ) {
+ $("#switch-version-button").addClass("fa fa-history masthead-icon");
+ }
+ });
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Added: incubator/samza/site/learn/documentation/0.8/jobs/packaging.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/packaging.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/packaging.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/packaging.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,211 @@
+<!DOCTYPE html>
+<!--
+ 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.
+-->
+<html lang="en">
+ <head>
+ <meta charset="utf-8">
+ <title>Samza - Packaging</title>
+ <link href='/css/ropa-sans.css' rel='stylesheet' type='text/css'/>
+ <link href="/css/bootstrap.min.css" rel="stylesheet"/>
+ <link href="/css/font-awesome.min.css" rel="stylesheet"/>
+ <link href="/css/main.css" rel="stylesheet"/>
+ <link href="/css/syntax.css" rel="stylesheet"/>
+ <link rel="icon" type="image/png" href="/img/samza-icon.png">
+ <script src="/js/jquery-1.11.1.min.js"></script>
+ </head>
+ <body>
+ <div class="wrapper">
+ <div class="wrapper-content">
+
+ <div class="masthead">
+ <div class="container">
+ <div class="masthead-logo">
+ <a href="/" class="logo">samza</a>
+ </div>
+ <div class="masthead-icons">
+ <div class="pull-right">
+ <a href="/startup/download"><i class="fa fa-arrow-circle-o-down masthead-icon"></i></a>
+ <a href="https://git-wip-us.apache.org/repos/asf?p=incubator-samza.git;a=tree" target="_blank"><i class="fa fa-code masthead-icon" style="font-weight: bold;"></i></a>
+ <a href="https://twitter.com/samzastream" target="_blank"><i class="fa fa-twitter masthead-icon"></i></a>
+ <!-- this icon only shows in versioned pages -->
+
+
+
+
+ <a href="http://samza.incubator.apache.org/learn/documentation/latest/jobs/packaging.html"><i id="switch-version-button"></i></a>
+ <!-- links for the navigation bar -->
+
+
+ </div>
+ </div>
+ </div><!-- /.container -->
+ </div>
+
+ <div class="container">
+ <div class="menu">
+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
+ <li><a href="/startup/download">Download</a></li>
+ </ul>
+
+ <h1><i class="fa fa-book"></i> Learn</h1>
+ <ul>
+ <li><a href="/learn/documentation/0.8">Documentation</a></li>
+ <li><a href="/learn/documentation/0.8/jobs/configuration-table.html">Configuration</a></li>
+ <li><a href="/learn/documentation/0.8/api/javadocs/">Javadocs</a></li>
+ <li><a href="/learn/tutorials/0.8">Tutorials</a></li>
+ <li><a href="http://wiki.apache.org/samza/FAQ">FAQ</a></li>
+ <li><a href="http://wiki.apache.org/samza">Wiki</a></li>
+ <li><a href="http://wiki.apache.org/samza/PapersAndTalks">Papers & Talks</a></li>
+ <li><a href="http://blogs.apache.org/samza">Blog</a></li>
+ </ul>
+
+ <h1><i class="fa fa-comments"></i> Community</h1>
+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
+ <li><a href="/community/irc.html">IRC</a></li>
+ <li><a href="https://issues.apache.org/jira/browse/SAMZA">Bugs</a></li>
+ <li><a href="http://wiki.apache.org/samza/PoweredBy">Powered by</a></li>
+ <li><a href="http://wiki.apache.org/samza/Ecosystem">Ecosystem</a></li>
+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
+ <h1><i class="fa fa-code"></i> Contribute</h1>
+ <ul>
+ <li><a href="/contribute/rules.html">Rules</a></li>
+ <li><a href="/contribute/coding-guide.html">Coding Guide</a></li>
+ <li><a href="/contribute/projects.html">Projects</a></li>
+ <li><a href="/contribute/design-documents.html">Design Documents</a></li>
+ <li><a href="/contribute/code.html">Code</a></li>
+ <li><a href="https://reviews.apache.org/groups/samza">Review Board</a></li>
+ <li><a href="/contribute/tests.html">Tests</a></li>
+ <li><a href="/contribute/disclaimer.html">Disclaimer</a></li>
+ </ul>
+
+ <h1><i class="fa fa-history"></i> Archive</h1>
+ <ul>
+ <li><a href="/archive/index.html#latest">latest</a></li>
+ <li><a href="/archive/index.html#08">0.8</a></li>
+ <li><a href="/archive/index.html#07">0.7</a></li>
+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>Packaging</h2>
+
+<!--
+ 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.
+-->
+
+<p>The <a href="job-runner.html">JobRunner</a> page talks about run-job.sh, and how it’s used to start a job either locally (ProcessJobFactory/ThreadJobFactory) or with YARN (YarnJobFactory). In the diagram that shows the execution flow, it also shows a run-container.sh script. This script, along with a run-am.sh script, are what Samza actually calls to execute its code.</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">bin/run-am.sh
+bin/run-container.sh
+</code></pre></div>
+<p>The run-container.sh script is responsible for starting the <a href="../container/samza-container.html">SamzaContainer</a>. The run-am.sh script is responsible for starting Samza’s application master for YARN. Thus, the run-am.sh script is only used by the YarnJob, but both YarnJob and ProcessJob use run-container.sh.</p>
+
+<p>Typically, these two scripts are bundled into a tar.gz file that has a structure like this:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">bin/run-am.sh
+bin/run-class.sh
+bin/run-job.sh
+bin/run-container.sh
+lib/*.jar
+</code></pre></div>
+<p>To run a Samza job, you un-zip its tar.gz file, and execute the run-job.sh script, as defined in the JobRunner section. There are a number of interesting implications from this packaging scheme. First, you’ll notice that there is no configuration in the package. Second, you’ll notice that the lib directory contains all JARs that you’ll need to run your Samza job.</p>
+
+<p>The reason that configuration is decoupled from your Samza job packaging is that it allows configuration to be updated without having to re-build the entire Samza package. This makes life easier for everyone when you just need to tweak one parameter, and don’t want to have to worry about which branch your package was built from, or whether trunk is in a stable state. It also has the added benefit of forcing configuration to be fully resolved at runtime. This means that that the configuration for a job is resolved at the time run-job.sh is called (using –config-path and –config-provider parameters), and from that point on, the configuration is immutable, and passed where it needs to be by Samza (and YARN, if you’re using it).</p>
+
+<p>The second statement, that your Samza package contains all JARs that it needs to run, means that a Samza package is entirely self contained. This allows Samza jobs to run on independent Samza versions without conflicting with each other. This is in contrast to Hadoop, where JARs are pulled in from the local machine that the job is running on (using environment variables). With Samza, you might run your job on version 0.7.0, and someone else might run their job on version 0.8.0. There is no problem with this.</p>
+
+<h2 id="yarn-jobs-»"><a href="yarn-jobs.html">YARN Jobs »</a></h2>
+
+
+ </div>
+ </div>
+
+ </div><!-- /.wrapper-content -->
+ </div><!-- /.wrapper -->
+
+ <div class="footer">
+ <div class="container">
+ <!-- nothing for now. -->
+ </div>
+ </div>
+
+
+ <script>
+ $( document ).ready(function() {
+ if ( $.fn.urlExists( "/learn/documentation/latest/jobs/packaging.html" ) ) {
+ $("#switch-version-button").addClass("fa fa-history masthead-icon");
+ }
+ });
+
+ /* a function to test whether the url exists or not */
+ (function( $ ) {
+ $.fn.urlExists = function(url) {
+ var http = new XMLHttpRequest();
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Added: incubator/samza/site/learn/documentation/0.8/jobs/reprocessing.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/reprocessing.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/reprocessing.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/reprocessing.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,262 @@
+<!DOCTYPE html>
+<!--
+ 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
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+ See the License for the specific language governing permissions and
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+<html lang="en">
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+ <script src="/js/jquery-1.11.1.min.js"></script>
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+
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+ </div>
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+ <a href="/startup/download"><i class="fa fa-arrow-circle-o-down masthead-icon"></i></a>
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+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
+ <li><a href="/startup/download">Download</a></li>
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+ <li><a href="http://wiki.apache.org/samza">Wiki</a></li>
+ <li><a href="http://wiki.apache.org/samza/PapersAndTalks">Papers & Talks</a></li>
+ <li><a href="http://blogs.apache.org/samza">Blog</a></li>
+ </ul>
+
+ <h1><i class="fa fa-comments"></i> Community</h1>
+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
+ <li><a href="/community/irc.html">IRC</a></li>
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+ <li><a href="http://wiki.apache.org/samza/PoweredBy">Powered by</a></li>
+ <li><a href="http://wiki.apache.org/samza/Ecosystem">Ecosystem</a></li>
+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
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+ <ul>
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+ <li><a href="/archive/index.html#07">0.7</a></li>
+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>Reprocessing previously processed data</h2>
+
+<!--
+ 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.
+-->
+
+<p>From time to time you may want to deploy a new version of your Samza job that computes results differently. Perhaps you fixed a bug or introduced a new feature. For example, say you have a Samza job that classifies messages as spam or not-spam, using a machine learning model that you train offline. Periodically you want to deploy an updated version of your Samza job which includes the latest classification model.</p>
+
+<p>When you start up a new version of your job, a question arises: what do you want to do with messages that were previously processed with the old version of your job? The answer depends on the behavior you want:</p>
+
+<ol>
+<li><p><strong>No reprocessing:</strong> By default, Samza assumes that messages processed by the old version don’t need to be processed again. When the new version starts up, it will resume processing at the point where the old version left off (assuming you have <a href="../container/checkpointing.html">checkpointing</a> enabled). If this is the behavior you want, there’s nothing special you need to do.</p></li>
+<li><p><strong>Simple rewind:</strong> Perhaps you want to go back and re-process old messages using the new version of your job. For example, maybe the old version of your classifier marked things as spam too aggressively, so you now want to revisit its previous spam/not-spam decisions using an improved classifier. You can do this by restarting the job at an older point in time in the stream, and running through all the messages since that time. Thus your job starts off reprocessing messages that it has already seen, but it then seamlessly continues with new messages when the reprocessing is done.</p></li>
+</ol>
+
+<p>This approach requires an input system such as Kafka, which allows you to jump back in time to a previous point in the stream. We discuss below how this works in practice.</p>
+
+<ol>
+<li><strong>Parallel rewind:</strong> This approach avoids a downside of the <em>simple rewind</em> approach. With simple rewind, any new messages that appear while the job is reprocessing old data are queued up, and are processed when the reprocessing is done. The queueing delay needn’t be long, because Samza can stream through historical data very quickly, but some latency-sensitive applications need to process messages faster.</li>
+</ol>
+
+<p>In the <em>parallel rewind</em> approach, you run two jobs in parallel: one job continues to handle live updates with low latency (the <em>real-time job</em>), while the other is started at an older point in the stream and reprocesses historical data (the <em>reprocessing job</em>). The two jobs consume the same input stream at different points in time, and eventually the reprocessing job catches up with the real-time job.</p>
+
+<p>There are a few details that you need to think through before deploying parallel rewind, which we discuss below.</p>
+
+<h3 id="jumping-back-in-time">Jumping Back in Time</h3>
+
+<p>A common aspect of the <em>simple rewind</em> and <em>parallel rewind</em> approaches is: you have a job which jumps back to an old point in time in the input streams, and consumes all messages since that time. You achieve this by working with Samza’s checkpoints.</p>
+
+<p>Normally, when a Samza job starts up, it reads the latest checkpoint to determine at which offset in the input streams it needs to resume processing. If you need to rewind to an earlier time, you do that in one of two ways:</p>
+
+<ol>
+<li>You can stop the job, manipulate its last checkpoint to point to an older offset, and start the job up again. Samza includes a command-line tool called <a href="../container/checkpointing.html#toc_0">CheckpointTool</a> which you can use to manipulate checkpoints.</li>
+<li>You can start a new job with a different <em>job.name</em> or <em>job.id</em> (e.g. increment <em>job.id</em> every time you need to jump back in time). This gives the job a new checkpoint stream, with none of the old checkpoint information. You also need to set <a href="../container/checkpointing.html">samza.offset.default=oldest</a>, so that when the job starts up without checkpoint, it starts consuming at the oldest offset available.</li>
+</ol>
+
+<p>With either of these approaches you can get Samza to reprocess the entire history of messages in the input system. Input systems such as Kafka can retain a large amount of history — see discussion below. In order to speed up the reprocessing of historical data, you can increase the container count (<em>yarn.container.count</em> if you’re running Samza on YARN) to boost your job’s computational resources.</p>
+
+<p>If your job maintains any <a href="../container/state-management.html">persistent state</a>, you need to be careful when jumping back in time: resetting a checkpoint does not automatically change persistent state, so you could end up reprocessing old messages while using state from a later point in time. In most cases, a job that jumps back in time should start with an empty state. You can reset the state by deleting the changelog topic, or by changing the name of the changelog topic in your job configuration.</p>
+
+<p>When you’re jumping back in time, you’re using Samza somewhat like a batch processing framework (e.g. MapReduce) — with the difference that your job doesn’t stop when it has processed all the historical data, but instead continues running, incrementally processing the stream of new messages as they come in. This has the advantage that you don’t need to write and maintain separate batch and streaming versions of your job: you can just use the same Samza API for processing both real-time and historical data.</p>
+
+<h3 id="retention-of-history">Retention of history</h3>
+
+<p>Samza doesn’t maintain history itself — that is the responsibility of the input system, such as Kafka. How far back in time you can jump depends on the amount of history that is retained in that system.</p>
+
+<p>Kafka is designed to keep a fairly large amount of history: it is common for Kafka brokers to keep one or two weeks of message history accessible, even for high volume topics. The retention period is mostly determined by how much disk space you have available. Kafka’s performance <a href="http://engineering.linkedin.com/kafka/benchmarking-apache-kafka-2-million-writes-second-three-cheap-machines">remains high</a> even if you have terabytes of history.</p>
+
+<p>There are two different kinds of history which require different configuration:</p>
+
+<ul>
+<li><strong>Activity events</strong> are things like user tracking events, web server log events and the like. This kind of stream is typically configured with a time-based retention, e.g. a few weeks. Events older than the retention period are deleted (or archived in an offline system such as HDFS).</li>
+<li><strong>Database changes</strong> are events that show inserts, updates and deletes in a database. In this kind of stream, each event typically has a primary key, and a newer event for a key overwrites any older events for the same key. If the same key is updated many times, you’re only really interested in the most recent value. (The <a href="../container/state-management.html">changelog streams</a> used by Samza’s persistent state fall in this category.)</li>
+</ul>
+
+<p>In a database change stream, when you’re reprocessing data, you typically want to reprocess the entire database. You don’t want to miss a value just because it was last updated more than a few weeks ago. In other words, you don’t want change events to be deleted just because they are older than some threshold. In this case, when you’re jumping back in time, you need to rewind to the <em>beginning of time</em>, to the first change ever made to the database (known in Kafka as “offset 0”).</p>
+
+<p>Fortunately this can be done efficiently, using a Kafka feature called <a href="http://kafka.apache.org/documentation.html#compaction">log compaction</a>. </p>
+
+<p>For example, imagine your database contains counters: every time something happens, you increment the appropriate counters and update the database with the new counter values. Every update is sent to the changelog, and because there are many updates, the changelog stream will take up a lot of space. With log compaction turned on, Kafka deduplicates the stream in the background, keeping only the most recent counter value for each key, and deleting any old values for the same counter. This reduces the size of the stream so much that you can keep the most recent update for every key, even if it was last updated long ago.</p>
+
+<p>With log compaction enabled, the stream of database changes becomes a full copy of the entire database. By jumping back to offset 0, your Samza job can scan over the entire database and reprocess it. This is a very powerful way of building scalable applications.</p>
+
+<h3 id="details-of-parallel-rewind">Details of Parallel Rewind</h3>
+
+<p>If you are taking the <em>parallel rewind</em> approach described above, running two jobs in parallel, you need to configure them carefully to avoid problems. In particular, some things to look out for:</p>
+
+<ul>
+<li>Make sure that the two jobs don’t interfere with each other. They need different <em>job.name</em> or <em>job.id</em> configuration properties, so that each job gets its own checkpoint stream. If the jobs maintain <a href="../container/state-management.html">persistent state</a>, each job needs its own changelog (two different jobs writing to the same changelog produces undefined results).</li>
+<li>What happens to job output? If the job sends its results to an output stream, or writes to a database, then the easiest solution is for each job to have a separate output stream or database table. If they write to the same output, you need to take care to ensure that newer data isn’t overwritten with older data (due to race conditions between the two jobs).</li>
+<li>Do you need to support A/B testing between the old and the new version of your job, e.g. to test whether the new version improves your metrics? Parallel rewind is ideal for this: each job writes to a separate output, and clients or consumers of the output can read from either the old or the new version’s output, depending on whether a user is in test group A or B.</li>
+<li>Reclaiming resources: you might want to keep the old version of your job running for a while, even when the new version has finished reprocessing historical data (especially if the old version’s output is being used in an A/B test). However, eventually you’ll want to shut it down, and delete the checkpoint and changelog streams belonging to the old version.</li>
+</ul>
+
+<p>Samza gives you a lot of flexibility for reprocessing historical data, and you don’t need to program against a separate batch processing API to take advantage of it. If you’re mindful of these issues, you can build a data system that is very robust, but still gives you lots of freedom to change your processing logic in future.</p>
+
+<h2 id="application-master-»"><a href="../yarn/application-master.html">Application Master »</a></h2>
+
+
+ </div>
+ </div>
+
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Added: incubator/samza/site/learn/documentation/0.8/jobs/yarn-jobs.html
URL: http://svn.apache.org/viewvc/incubator/samza/site/learn/documentation/0.8/jobs/yarn-jobs.html?rev=1643389&view=auto
==============================================================================
--- incubator/samza/site/learn/documentation/0.8/jobs/yarn-jobs.html (added)
+++ incubator/samza/site/learn/documentation/0.8/jobs/yarn-jobs.html Fri Dec 5 18:52:32 2014
@@ -0,0 +1,202 @@
+<!DOCTYPE html>
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
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+ 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.
+-->
+<html lang="en">
+ <head>
+ <meta charset="utf-8">
+ <title>Samza - YARN Jobs</title>
+ <link href='/css/ropa-sans.css' rel='stylesheet' type='text/css'/>
+ <link href="/css/bootstrap.min.css" rel="stylesheet"/>
+ <link href="/css/font-awesome.min.css" rel="stylesheet"/>
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+ <link rel="icon" type="image/png" href="/img/samza-icon.png">
+ <script src="/js/jquery-1.11.1.min.js"></script>
+ </head>
+ <body>
+ <div class="wrapper">
+ <div class="wrapper-content">
+
+ <div class="masthead">
+ <div class="container">
+ <div class="masthead-logo">
+ <a href="/" class="logo">samza</a>
+ </div>
+ <div class="masthead-icons">
+ <div class="pull-right">
+ <a href="/startup/download"><i class="fa fa-arrow-circle-o-down masthead-icon"></i></a>
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+ </div><!-- /.container -->
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+ <h1><i class="fa fa-rocket"></i> Getting Started</h1>
+ <ul>
+ <li><a href="/startup/hello-samza/0.8">Hello Samza</a></li>
+ <li><a href="/startup/download">Download</a></li>
+ </ul>
+
+ <h1><i class="fa fa-book"></i> Learn</h1>
+ <ul>
+ <li><a href="/learn/documentation/0.8">Documentation</a></li>
+ <li><a href="/learn/documentation/0.8/jobs/configuration-table.html">Configuration</a></li>
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+ <li><a href="http://blogs.apache.org/samza">Blog</a></li>
+ </ul>
+
+ <h1><i class="fa fa-comments"></i> Community</h1>
+ <ul>
+ <li><a href="/community/mailing-lists.html">Mailing Lists</a></li>
+ <li><a href="/community/irc.html">IRC</a></li>
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+ <li><a href="/community/committers.html">Committers</a></li>
+ </ul>
+
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+ </ul>
+ </div>
+
+ <div class="content">
+ <!--
+ 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.
+-->
+
+<h2>YARN Jobs</h2>
+
+<!--
+ 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.
+-->
+
+<p>When you define <code>job.factory.class=org.apache.samza.job.yarn.YarnJobFactory</code> in your job’s configuration, Samza will use YARN to execute your job. The YarnJobFactory will use the YARN_HOME environment variable on the machine that run-job.sh is executed on to get the appropriate YARN configuration, which will define where the YARN resource manager is. The YarnJob will work with the resource manager to get your job started on the YARN cluster.</p>
+
+<p>If you want to use YARN to run your Samza job, you’ll also need to define the location of your Samza job’s package. For example, you might say:</p>
+
+<div class="highlight"><pre><code class="jproperties"><span class="na">yarn.package.path</span><span class="o">=</span><span class="s">http://my.http.server/jobs/ingraphs-package-0.0.55.tgz</span></code></pre></div>
+
+<p>This .tgz file follows the conventions outlined on the <a href="packaging.html">Packaging</a> page (it has bin/run-am.sh and bin/run-container.sh). YARN NodeManagers will take responsibility for downloading this .tgz file on the appropriate machines, and untar'ing them. From there, YARN will execute run-am.sh or run-container.sh for the Samza Application Master, and SamzaContainer, respectively.</p>
+
+<!-- TODO document yarn.container.count and other key configs -->
+
+<h2 id="logging-»"><a href="logging.html">Logging »</a></h2>
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