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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/compute/compute.adoc" target="_blank">Edit</a>
<h1>Distributed Computing</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Apache Ignite 3 provides an API for distributing computations across cluster nodes in a balanced and fault-tolerant manner. You can submit individual tasks for execution from Java and .NET clients.</p>
</div>
<div class="paragraph">
<p>You can use Java or .NET client to execute compute jobs. Make sure the required classes are deployed to the cluster before executing code.</p>
</div>
<div class="paragraph">
<p>Here is how you can execute a simple compute job:</p>
</div>
<code-tabs><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="kd">private</span> <span class="kt">void</span> <span class="nf">example</span><span class="o">()</span> <span class="o">{</span>
<span class="nc">IgniteClient</span> <span class="n">client</span> <span class="o">=</span> <span class="n">client</span><span class="o">();</span>
<span class="nc">IgniteCompute</span> <span class="n">compute</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="na">compute</span><span class="o">();</span>
<span class="nc">Set</span><span class="o">&lt;</span><span class="nc">ClusterNode</span><span class="o">&gt;</span> <span class="n">nodes</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">HashSet</span><span class="o">&lt;&gt;(</span><span class="n">client</span><span class="o">.</span><span class="na">clusterNodes</span><span class="o">());</span>
<span class="n">compute</span><span class="o">.</span><span class="na">execute</span><span class="o">(</span><span class="n">nodes</span><span class="o">,</span> <span class="nc">NodeNameJob</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="s">"Hello"</span><span class="o">);</span>
<span class="o">}</span>
<span class="kd">private</span> <span class="kd">static</span> <span class="kd">class</span> <span class="nc">NodeNameJob</span> <span class="kd">implements</span> <span class="nc">ComputeJob</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">&gt;</span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">execute</span><span class="o">(</span><span class="nc">JobExecutionContext</span> <span class="n">context</span><span class="o">,</span> <span class="nc">Object</span><span class="o">...</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">context</span><span class="o">.</span><span class="na">ignite</span><span class="o">().</span><span class="na">name</span><span class="o">()</span> <span class="o">+</span> <span class="s">"_"</span> <span class="o">+</span> <span class="n">args</span><span class="o">[</span><span class="mi">0</span><span class="o">];</span>
<span class="o">}</span>
<span class="o">}</span></code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
Unlike Ignite 2, jobs are not serialized. Only the class name and arguments are sent to the node.
</td>
</tr>
</table>
</div></code-tab><code-tab data-tab='.NET'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="n">IIgniteClient</span> <span class="n">client</span> <span class="p">=</span> <span class="n">Client</span><span class="p">;</span>
<span class="n">ICompute</span> <span class="n">compute</span> <span class="p">=</span> <span class="n">client</span><span class="p">.</span><span class="n">Compute</span><span class="p">;</span>
<span class="n">IList</span><span class="p">&lt;</span><span class="n">IClusterNode</span><span class="p">&gt;</span> <span class="n">nodes</span> <span class="p">=</span> <span class="k">await</span> <span class="n">Client</span><span class="p">.</span><span class="nf">GetClusterNodesAsync</span><span class="p">();</span>
<span class="kt">string</span> <span class="n">res</span> <span class="p">=</span> <span class="k">await</span> <span class="n">compute</span><span class="p">.</span><span class="n">ExecuteAsync</span><span class="p">&lt;</span><span class="kt">string</span><span class="p">&gt;(</span><span class="n">nodes</span><span class="p">,</span> <span class="n">jobClassName</span><span class="p">:</span> <span class="s">"org.foo.bar.NodeNameJob"</span><span class="p">,</span> <span class="s">"Hello!"</span><span class="p">);</span></code></pre>
</div>
</div></code-tab></code-tabs>
</div>
</div>
<div class="sect1">
<h2 id="colocated-computations">Colocated Computations</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In Apache Ignite 3 you can execute colocated computation with <code>executeColocated</code> method. When you do it, the compute task is guaranteed to be executed on the nodes that hold the specified key. This can significantly reduce execution time if your tasks require data.</p>
</div>
<div class="paragraph">
<p>In this example we will need a table to colocate:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="n">executeSql</span><span class="o">(</span><span class="s">"CREATE TABLE test (k int, v int, CONSTRAINT PK PRIMARY KEY (k))"</span><span class="o">);</span>
<span class="n">executeSql</span><span class="o">(</span><span class="s">"INSERT INTO test(k, v) VALUES (1, 101)"</span><span class="o">);</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>And we will execute a simple task:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>class GetNodeNameJob implements ComputeJob&lt;String&gt; {
@Override
public String execute(JobExecutionContext context, Object... args) {
return context.ignite().name();
}
}</pre>
</div>
</div>
<code-tabs><code-tab data-tab='Tuple'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">String</span> <span class="n">actualNodeName</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">compute</span><span class="o">()</span>
<span class="o">.</span><span class="na">executeColocated</span><span class="o">(</span><span class="s">"PUBLIC.test"</span><span class="o">,</span> <span class="nc">Tuple</span><span class="o">.</span><span class="na">create</span><span class="o">(</span><span class="nc">Map</span><span class="o">.</span><span class="na">of</span><span class="o">(</span><span class="s">"k"</span><span class="o">,</span> <span class="mi">1</span><span class="o">)),</span> <span class="nc">GetNodeNameJob</span><span class="o">.</span><span class="na">class</span><span class="o">)</span>
<span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="nc">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">);</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">actualNodeName</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Mapper'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">String</span> <span class="n">actualNodeName</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">compute</span><span class="o">()</span>
<span class="o">.</span><span class="na">executeColocated</span><span class="o">(</span><span class="s">"PUBLIC.test"</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="nc">Mapper</span><span class="o">.</span><span class="na">of</span><span class="o">(</span><span class="nc">Integer</span><span class="o">.</span><span class="na">class</span><span class="o">),</span> <span class="nc">GetNodeNameJob</span><span class="o">.</span><span class="na">class</span><span class="o">)</span>
<span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="nc">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">);</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">actualNodeName</span><span class="o">);</span></code></pre>
</div>
</div></code-tab></code-tabs>
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© 2022 The Apache Software Foundation.<br/>
Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation.
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