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| <h1 class="title">Write Your 1st Gearpump App</h1> |
| |
| |
| <p>We’ll use <a href="https://github.com/gearpump/gearpump/blob/master/examples/streaming/wordcount/src/main/scala/io/gearpump/streaming/examples/wordcount/">wordcount</a> as an example to illustrate how to write Gearpump applications.</p> |
| |
| <h3 id="mavensbt-settings">Maven/Sbt Settings</h3> |
| |
| <p>Repository and library dependencies can be found at <a href="maven-setting.html">Maven Setting</a>.</p> |
| |
| <h3 id="ide-setup-optional">IDE Setup (Optional)</h3> |
| <p>You can get your preferred IDE ready for Gearpump by following <a href="dev-ide-setup.html">this guide</a>.</p> |
| |
| <h3 id="define-processortask-class-and-partitioner-class">Define Processor(Task) class and Partitioner class</h3> |
| |
| <p>An application is a Directed Acyclic Graph (DAG) of processors. In the wordcount example, We will firstly define two processors <code>Split</code> and <code>Sum</code>, and then weave them together.</p> |
| |
| <h4 id="about-message-type">About message type</h4> |
| |
| <p>User are allowed to send message of type Any(Accept any type except Null, Nothing and Unit).</p> |
| |
| <div class="highlight"><pre><code>case class Message(msg: Any, timestamp: TimeStamp = Message.noTimeStamp) |
| </code></pre></div> |
| |
| <h4 id="split-processor">Split processor</h4> |
| |
| <p>In the Split processor, we simply split a predefined text (the content is simplified for conciseness) and send out each split word to Sum.</p> |
| |
| <p>Scala:</p> |
| |
| <div class="highlight"><pre><code class="language-scala"><span class="k">class</span> <span class="nc">Split</span><span class="o">(</span><span class="n">taskContext</span> <span class="k">:</span> <span class="kt">TaskContext</span><span class="o">,</span> <span class="n">conf</span><span class="k">:</span> <span class="kt">UserConfig</span><span class="o">)</span> <span class="k">extends</span> <span class="nc">Task</span><span class="o">(</span><span class="n">taskContext</span><span class="o">,</span> <span class="n">conf</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">import</span> <span class="nn">taskContext.output</span> |
| |
| <span class="k">override</span> <span class="k">def</span> <span class="n">onStart</span><span class="o">(</span><span class="n">startTime</span> <span class="k">:</span> <span class="kt">StartTime</span><span class="o">)</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="n">self</span> <span class="o">!</span> <span class="nc">Message</span><span class="o">(</span><span class="s">"start"</span><span class="o">)</span> |
| <span class="o">}</span> |
| |
| <span class="k">override</span> <span class="k">def</span> <span class="n">onNext</span><span class="o">(</span><span class="n">msg</span> <span class="k">:</span> <span class="kt">Message</span><span class="o">)</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="nc">Split</span><span class="o">.</span><span class="nc">TEXT_TO_SPLIT</span><span class="o">.</span><span class="n">lines</span><span class="o">.</span><span class="n">foreach</span> <span class="o">{</span> <span class="n">line</span> <span class="k">=></span> |
| <span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="o">(</span><span class="s">"[\\s]+"</span><span class="o">).</span><span class="n">filter</span><span class="o">(</span><span class="k">_</span><span class="o">.</span><span class="n">nonEmpty</span><span class="o">).</span><span class="n">foreach</span> <span class="o">{</span> <span class="n">msg</span> <span class="k">=></span> |
| <span class="n">output</span><span class="o">(</span><span class="k">new</span> <span class="nc">Message</span><span class="o">(</span><span class="n">msg</span><span class="o">,</span> <span class="nc">System</span><span class="o">.</span><span class="n">currentTimeMillis</span><span class="o">()))</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| <span class="n">self</span> <span class="o">!</span> <span class="nc">Message</span><span class="o">(</span><span class="s">"continue"</span><span class="o">,</span> <span class="nc">System</span><span class="o">.</span><span class="n">currentTimeMillis</span><span class="o">())</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| |
| <span class="k">object</span> <span class="nc">Split</span> <span class="o">{</span> |
| <span class="k">val</span> <span class="nc">TEXT_TO_SPLIT</span> <span class="k">=</span> <span class="s">"some text"</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <p>Like Split, every processor extends a <code>TaskActor</code>. The <code>onStart</code> method is called once before any message comes in; <code>onNext</code> method is called to process every incoming message. Note that Gearpump employs the message-driven model and that’s why Split sends itself a message at the end of <code>onStart</code> and <code>onNext</code> to trigger next message processing.</p> |
| |
| <h4 id="sum-processor">Sum Processor</h4> |
| |
| <p>The structure of Sum processor looks much alike. Sum does not need to send messages to itself since it receives messages from Split.</p> |
| |
| <p>Scala:</p> |
| |
| <div class="highlight"><pre><code class="language-scala"><span class="k">class</span> <span class="nc">Sum</span> <span class="o">(</span><span class="n">taskContext</span> <span class="k">:</span> <span class="kt">TaskContext</span><span class="o">,</span> <span class="n">conf</span><span class="k">:</span> <span class="kt">UserConfig</span><span class="o">)</span> <span class="k">extends</span> <span class="nc">Task</span><span class="o">(</span><span class="n">taskContext</span><span class="o">,</span> <span class="n">conf</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">private</span><span class="o">[</span><span class="kt">wordcount</span><span class="o">]</span> <span class="k">val</span> <span class="n">map</span> <span class="k">:</span> <span class="kt">mutable.HashMap</span><span class="o">[</span><span class="kt">String</span>, <span class="kt">Long</span><span class="o">]</span> <span class="k">=</span> <span class="k">new</span> <span class="n">mutable</span><span class="o">.</span><span class="nc">HashMap</span><span class="o">[</span><span class="kt">String</span>, <span class="kt">Long</span><span class="o">]()</span> |
| |
| <span class="k">private</span><span class="o">[</span><span class="kt">wordcount</span><span class="o">]</span> <span class="k">var</span> <span class="n">wordCount</span> <span class="k">:</span> <span class="kt">Long</span> <span class="o">=</span> <span class="mi">0</span> |
| <span class="k">private</span> <span class="k">var</span> <span class="n">snapShotTime</span> <span class="k">:</span> <span class="kt">Long</span> <span class="o">=</span> <span class="nc">System</span><span class="o">.</span><span class="n">currentTimeMillis</span><span class="o">()</span> |
| <span class="k">private</span> <span class="k">var</span> <span class="n">snapShotWordCount</span> <span class="k">:</span> <span class="kt">Long</span> <span class="o">=</span> <span class="mi">0</span> |
| |
| <span class="k">private</span> <span class="k">var</span> <span class="n">scheduler</span> <span class="k">:</span> <span class="kt">Cancellable</span> <span class="o">=</span> <span class="kc">null</span> |
| |
| <span class="k">override</span> <span class="k">def</span> <span class="n">onStart</span><span class="o">(</span><span class="n">startTime</span> <span class="k">:</span> <span class="kt">StartTime</span><span class="o">)</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="n">scheduler</span> <span class="k">=</span> <span class="n">taskContext</span><span class="o">.</span><span class="n">schedule</span><span class="o">(</span><span class="k">new</span> <span class="nc">FiniteDuration</span><span class="o">(</span><span class="mi">5</span><span class="o">,</span> <span class="nc">TimeUnit</span><span class="o">.</span><span class="nc">SECONDS</span><span class="o">),</span> |
| <span class="k">new</span> <span class="nc">FiniteDuration</span><span class="o">(</span><span class="mi">5</span><span class="o">,</span> <span class="nc">TimeUnit</span><span class="o">.</span><span class="nc">SECONDS</span><span class="o">))(</span><span class="n">reportWordCount</span><span class="o">)</span> |
| <span class="o">}</span> |
| |
| <span class="k">override</span> <span class="k">def</span> <span class="n">onNext</span><span class="o">(</span><span class="n">msg</span> <span class="k">:</span> <span class="kt">Message</span><span class="o">)</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(</span><span class="kc">null</span> <span class="o">==</span> <span class="n">msg</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">return</span> |
| <span class="o">}</span> |
| <span class="k">val</span> <span class="n">current</span> <span class="k">=</span> <span class="n">map</span><span class="o">.</span><span class="n">getOrElse</span><span class="o">(</span><span class="n">msg</span><span class="o">.</span><span class="n">msg</span><span class="o">.</span><span class="n">asInstanceOf</span><span class="o">[</span><span class="kt">String</span><span class="o">],</span> <span class="mi">0L</span><span class="o">)</span> |
| <span class="n">wordCount</span> <span class="o">+=</span> <span class="mi">1</span> |
| <span class="n">map</span><span class="o">.</span><span class="n">put</span><span class="o">(</span><span class="n">msg</span><span class="o">.</span><span class="n">msg</span><span class="o">.</span><span class="n">asInstanceOf</span><span class="o">[</span><span class="kt">String</span><span class="o">],</span> <span class="n">current</span> <span class="o">+</span> <span class="mi">1</span><span class="o">)</span> |
| <span class="o">}</span> |
| |
| <span class="k">override</span> <span class="k">def</span> <span class="n">onStop</span><span class="o">()</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(</span><span class="n">scheduler</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">scheduler</span><span class="o">.</span><span class="n">cancel</span><span class="o">()</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| |
| <span class="k">def</span> <span class="n">reportWordCount</span><span class="o">()</span> <span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="k">val</span> <span class="n">current</span> <span class="k">:</span> <span class="kt">Long</span> <span class="o">=</span> <span class="nc">System</span><span class="o">.</span><span class="n">currentTimeMillis</span><span class="o">()</span> |
| <span class="nc">LOG</span><span class="o">.</span><span class="n">info</span><span class="o">(</span><span class="n">s</span><span class="s">"Task ${taskContext.taskId} Throughput: ${(wordCount - snapShotWordCount, (current - snapShotTime) / 1000)} (words, second)"</span><span class="o">)</span> |
| <span class="n">snapShotWordCount</span> <span class="k">=</span> <span class="n">wordCount</span> |
| <span class="n">snapShotTime</span> <span class="k">=</span> <span class="n">current</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <p>Besides counting the sum, we also define a scheduler to report throughput every 5 seconds. The scheduler should be cancelled when the computation completes, which could be accomplished overriding the <code>onStop</code> method. The default implementation of <code>onStop</code> is a no-op.</p> |
| |
| <h4 id="partitioner">Partitioner</h4> |
| |
| <p>A processor could be parallelized to a list of tasks. A <code>Partitioner</code> defines how the data is shuffled among tasks of Split and Sum. Gearpump has already provided two partitioners</p> |
| |
| <ul> |
| <li><code>HashPartitioner</code>: partitions data based on the message’s hashcode</li> |
| <li><code>ShufflePartitioner</code>: partitions data in a round-robin way.</li> |
| </ul> |
| |
| <p>You could define your own partitioner by extending the <code>Partitioner</code> trait and overriding the <code>getPartition</code> method.</p> |
| |
| <div class="highlight"><pre><code class="language-scala"><span class="k">trait</span> <span class="nc">Partitioner</span> <span class="k">extends</span> <span class="nc">Serializable</span> <span class="o">{</span> |
| <span class="k">def</span> <span class="n">getPartition</span><span class="o">(</span><span class="n">msg</span> <span class="k">:</span> <span class="kt">Message</span><span class="o">,</span> <span class="n">partitionNum</span> <span class="k">:</span> <span class="kt">Int</span><span class="o">)</span> <span class="k">:</span> <span class="kt">Int</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <h3 id="define-taskdescription-and-appdescription">Define TaskDescription and AppDescription</h3> |
| |
| <p>Now, we are able to write our application class, weaving the above components together.</p> |
| |
| <p>The application class extends <code>App</code> and `ArgumentsParser which make it easier to parse arguments and run main functions.</p> |
| |
| <div class="highlight"><pre><code class="language-scala"><span class="k">object</span> <span class="nc">WordCount</span> <span class="k">extends</span> <span class="nc">App</span> <span class="k">with</span> <span class="nc">ArgumentsParser</span> <span class="o">{</span> |
| <span class="k">private</span> <span class="k">val</span> <span class="nc">LOG</span><span class="k">:</span> <span class="kt">Logger</span> <span class="o">=</span> <span class="nc">LogUtil</span><span class="o">.</span><span class="n">getLogger</span><span class="o">(</span><span class="n">getClass</span><span class="o">)</span> |
| <span class="k">val</span> <span class="nc">RUN_FOR_EVER</span> <span class="k">=</span> <span class="o">-</span><span class="mi">1</span> |
| |
| <span class="k">override</span> <span class="k">val</span> <span class="n">options</span><span class="k">:</span> <span class="kt">Array</span><span class="o">[(</span><span class="kt">String</span>, <span class="kt">CLIOption</span><span class="o">[</span><span class="kt">Any</span><span class="o">])]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span> |
| <span class="s">"split"</span> <span class="o">-></span> <span class="nc">CLIOption</span><span class="o">[</span><span class="kt">Int</span><span class="o">](</span><span class="s">"<how many split tasks>"</span><span class="o">,</span> <span class="n">required</span> <span class="k">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">defaultValue</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="mi">1</span><span class="o">)),</span> |
| <span class="s">"sum"</span> <span class="o">-></span> <span class="nc">CLIOption</span><span class="o">[</span><span class="kt">Int</span><span class="o">](</span><span class="s">"<how many sum tasks>"</span><span class="o">,</span> <span class="n">required</span> <span class="k">=</span> <span class="kc">false</span><span class="o">,</span> <span class="n">defaultValue</span> <span class="k">=</span> <span class="nc">Some</span><span class="o">(</span><span class="mi">1</span><span class="o">))</span> |
| <span class="o">)</span> |
| |
| <span class="k">def</span> <span class="n">application</span><span class="o">(</span><span class="n">config</span><span class="k">:</span> <span class="kt">ParseResult</span><span class="o">)</span> <span class="k">:</span> <span class="kt">StreamApplication</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="k">val</span> <span class="n">splitNum</span> <span class="k">=</span> <span class="n">config</span><span class="o">.</span><span class="n">getInt</span><span class="o">(</span><span class="s">"split"</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">sumNum</span> <span class="k">=</span> <span class="n">config</span><span class="o">.</span><span class="n">getInt</span><span class="o">(</span><span class="s">"sum"</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">partitioner</span> <span class="k">=</span> <span class="k">new</span> <span class="nc">HashPartitioner</span><span class="o">()</span> |
| <span class="k">val</span> <span class="n">split</span> <span class="k">=</span> <span class="nc">Processor</span><span class="o">[</span><span class="kt">Split</span><span class="o">](</span><span class="n">splitNum</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">sum</span> <span class="k">=</span> <span class="nc">Processor</span><span class="o">[</span><span class="kt">Sum</span><span class="o">](</span><span class="n">sumNum</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">app</span> <span class="k">=</span> <span class="nc">StreamApplication</span><span class="o">(</span><span class="s">"wordCount"</span><span class="o">,</span> <span class="nc">Graph</span><span class="o">[</span><span class="kt">Processor</span><span class="o">[</span><span class="k">_</span> <span class="k"><:</span> <span class="kt">Task</span><span class="o">]</span>, <span class="kt">Partitioner</span><span class="o">](</span><span class="n">split</span> <span class="o">~</span> <span class="n">partitioner</span> <span class="o">~></span> <span class="n">sum</span><span class="o">),</span> <span class="nc">UserConfig</span><span class="o">.</span><span class="n">empty</span><span class="o">)</span> |
| <span class="n">app</span> |
| <span class="o">}</span> |
| |
| <span class="k">val</span> <span class="n">config</span> <span class="k">=</span> <span class="n">parse</span><span class="o">(</span><span class="n">args</span><span class="o">)</span> |
| <span class="k">val</span> <span class="n">context</span> <span class="k">=</span> <span class="nc">ClientContext</span><span class="o">()</span> |
| <span class="k">val</span> <span class="n">appId</span> <span class="k">=</span> <span class="n">context</span><span class="o">.</span><span class="n">submit</span><span class="o">(</span><span class="n">application</span><span class="o">(</span><span class="n">config</span><span class="o">))</span> |
| <span class="n">context</span><span class="o">.</span><span class="n">close</span><span class="o">()</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <p>We override <code>options</code> value and define an array of command line arguments to parse. We want application users to pass in masters’ hosts and ports, the parallelism of split and sum tasks, and how long to run the example. We also specify whether an option is <code>required</code> and provide <code>defaultValue</code> for some arguments.</p> |
| |
| <p>Given the <code>ParseResult</code> of command line arguments, we create <code>TaskDescription</code>s for Split and Sum processors, and connect them with <code>HashPartitioner</code> using DAG API. The graph is wrapped in an <code>AppDescrition</code> , which is finally submit to master.</p> |
| |
| <h3 id="submit-application">Submit application</h3> |
| |
| <p>After all these, you need to package everything into a uber jar and submit the jar to Gearpump Cluster. Please check <a href="commandline.html">Application submission tool</a> to command line tool syntax.</p> |
| |
| <h3 id="advanced-topic">Advanced topic</h3> |
| <p>For a real application, you definitely need to define your own customized message passing between processors. |
| Customized message needs customized serializer to help message passing over wire. |
| Check <a href="dev-custom-serializer.html">this guide</a> for how to customize serializer.</p> |
| |
| <h3 id="gearpump-for-non-streaming-usage">Gearpump for Non-Streaming Usage</h3> |
| <p>Gearpump is also able to as a base platform to develop non-streaming applications. See <a href="dev-non-streaming-example.html">this guide</a> on how to use Gearpump to develop a distributed shell.</p> |
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