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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/monitoring-metrics/tracing.adoc" target="_blank">Edit</a>
<h1>Tracing</h1>
<div id="preamble">
<div class="sectionbody">
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<div class="title">Warning</div>
</td>
<td class="content">
This feature is experimental.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>A number of APIs in Ignite are instrumented for tracing with OpenCensus.
You can collect distributed traces of various tasks executed in your cluster and use this information to diagnose latency problems.</p>
</div>
<div class="paragraph">
<p>We suggest you get familiar with OpenCensus tracing documentation before reading this chapter: <a href="https://opencensus.io/tracing/" class="bare" target="_blank" rel="noopener">https://opencensus.io/tracing/</a>.</p>
</div>
<div class="paragraph">
<p>The following Ignite APIs are instrumented for tracing:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Discovery</p>
</li>
<li>
<p>Communication</p>
</li>
<li>
<p>Exchange</p>
</li>
<li>
<p>Transactions</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>To view traces, you must export them into an external system.
You can use one of the OpenCensus exporters or write your own, but in any case, you will have to write code that registers an exporter in Ignite.
Refer to <a href="#exporting-traces">Exporting Traces</a> for details.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-tracing">Configuring Tracing</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Enable OpenCensus tracing in the node configuration. All nodes in the cluster must use the same tracing configuration.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"tracingSpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.tracing.opencensus.OpenCensusTracingSpi"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setTracingSpi</span><span class="o">(</span><span class="k">new</span> <span class="n">org</span><span class="o">.</span><span class="na">apache</span><span class="o">.</span><span class="na">ignite</span><span class="o">.</span><span class="na">spi</span><span class="o">.</span><span class="na">tracing</span><span class="o">.</span><span class="na">opencensus</span><span class="o">.</span><span class="na">OpenCensusTracingSpi</span><span class="o">());</span>
<span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
</div>
</div></code-tab></code-tabs>
</div>
</div>
<div class="sect1">
<h2 id="enabling-trace-sampling">Enabling Trace Sampling</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When you start your cluster with the above configuration, Ignite does not collect traces.
You have to enable trace sampling for a specific API at runtime.
You can turn trace sampling on and off at will, for example, only for the period when you are troubleshooting a problem.</p>
</div>
<div class="paragraph">
<p>You can do this in two ways:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>via the control script from the command line</p>
</li>
<li>
<p>programmatically</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Traces are collected at a given probabilistic sampling rate.
The rate is specified as a value between 0.0 and 1.0 inclusive: <code>0</code> means no sampling, <code>1</code> means always sampling.</p>
</div>
<div class="paragraph">
<p>When the sampling rate is set to a value greater than 0, Ignite collects traces.
To disable trace collection, set the sampling rate to 0.</p>
</div>
<div class="paragraph">
<p>The following sections describe the two ways of enabling trace sampling.</p>
</div>
<div class="sect2">
<h3 id="using-control-script">Using Control Script</h3>
<div class="paragraph">
<p>Go to the <code>{IGNITE_HOME}/bin</code> directory of your Ignite installation.
Enable experimental commands in the control script:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="shell"><span class="nb">export </span><span class="nv">IGNITE_ENABLE_EXPERIMENTAL_COMMAND</span><span class="o">=</span><span class="nb">true</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Enable tracing for a specific API:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="shell">./control.sh <span class="nt">--tracing-configuration</span> <span class="nb">set</span> <span class="nt">--scope</span> TX <span class="nt">--sampling-rate</span> 1</code></pre>
</div>
</div>
<div class="paragraph">
<p>Refer to the <a href="/docs/2.9.0/control-script#tracing-configuration">Control Script</a> sections for the list of all parameters.</p>
</div>
</div>
<div class="sect2">
<h3 id="programmatically">Programmatically</h3>
<div class="paragraph">
<p>Once you start the node, you can enable trace sampling as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
<span class="n">ignite</span><span class="o">.</span><span class="na">tracingConfiguration</span><span class="o">().</span><span class="na">set</span><span class="o">(</span>
<span class="k">new</span> <span class="nc">TracingConfigurationCoordinates</span><span class="o">.</span><span class="na">Builder</span><span class="o">(</span><span class="nc">Scope</span><span class="o">.</span><span class="na">TX</span><span class="o">).</span><span class="na">build</span><span class="o">(),</span>
<span class="k">new</span> <span class="nc">TracingConfigurationParameters</span><span class="o">.</span><span class="na">Builder</span><span class="o">().</span><span class="na">withSamplingRate</span><span class="o">(</span><span class="mi">1</span><span class="o">).</span><span class="na">build</span><span class="o">());</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>--scope</code> parameter specifies the API you want to trace.
The following APIs are instrumented for tracing:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>DISCOVERY</code> — discovery events</p>
</li>
<li>
<p><code>EXCHANGE</code> — exchange events</p>
</li>
<li>
<p><code>COMMUNICATION</code> — communication events</p>
</li>
<li>
<p><code>TX</code> — transactions</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The <code>--sampling-rate</code> is the probabilistic sampling rate, a number between <code>0</code> and <code>1</code>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>0</code> means no sampling,</p>
</li>
<li>
<p><code>1</code> means always sampling.</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="exporting-traces">Exporting Traces</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To view traces, you need to export them to an external backend using one of the available exporters.
OpenCensus supports a number of exporters out-of-the-box, and you can write a custom one.
Refer to the <a href="https://opencensus.io/exporters/" target="_blank" rel="noopener">OpenCensus Exporters</a> for details.</p>
</div>
<div class="paragraph">
<p>In this section, we will show how to export traces to <a href="https://zipkin.io" target="_blank" rel="noopener">Zipkin</a>.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Follow <a href="https://zipkin.io/pages/quickstart.html" target="_blank" rel="noopener">this guide</a> to launch Zipkin on your machine.</p>
</li>
<li>
<p>Register <code>ZipkinTraceExporter</code> in the application where you start Ignite:</p>
<div class="openblock">
<div class="content">
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="c1">//register Zipkin exporter</span>
<span class="nc">ZipkinTraceExporter</span><span class="o">.</span><span class="na">createAndRegister</span><span class="o">(</span>
<span class="nc">ZipkinExporterConfiguration</span><span class="o">.</span><span class="na">builder</span><span class="o">().</span><span class="na">setV2Url</span><span class="o">(</span><span class="s">"http://localhost:9411/api/v2/spans"</span><span class="o">)</span>
<span class="o">.</span><span class="na">setServiceName</span><span class="o">(</span><span class="s">"ignite-cluster"</span><span class="o">).</span><span class="na">build</span><span class="o">());</span>
<span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">().</span><span class="na">setClientMode</span><span class="o">(</span><span class="kc">true</span><span class="o">)</span>
<span class="o">.</span><span class="na">setTracingSpi</span><span class="o">(</span><span class="k">new</span> <span class="n">org</span><span class="o">.</span><span class="na">apache</span><span class="o">.</span><span class="na">ignite</span><span class="o">.</span><span class="na">spi</span><span class="o">.</span><span class="na">tracing</span><span class="o">.</span><span class="na">opencensus</span><span class="o">.</span><span class="na">OpenCensusTracingSpi</span><span class="o">());</span>
<span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span>
<span class="c1">//enable trace sampling for transactions with 100% sampling rate</span>
<span class="n">ignite</span><span class="o">.</span><span class="na">tracingConfiguration</span><span class="o">().</span><span class="na">set</span><span class="o">(</span>
<span class="k">new</span> <span class="nc">TracingConfigurationCoordinates</span><span class="o">.</span><span class="na">Builder</span><span class="o">(</span><span class="nc">Scope</span><span class="o">.</span><span class="na">TX</span><span class="o">).</span><span class="na">build</span><span class="o">(),</span>
<span class="k">new</span> <span class="nc">TracingConfigurationParameters</span><span class="o">.</span><span class="na">Builder</span><span class="o">().</span><span class="na">withSamplingRate</span><span class="o">(</span><span class="mi">1</span><span class="o">).</span><span class="na">build</span><span class="o">());</span>
<span class="c1">//create a transactional cache</span>
<span class="nc">IgniteCache</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">&gt;</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span>
<span class="o">.</span><span class="na">getOrCreateCache</span><span class="o">(</span><span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">&gt;(</span><span class="s">"myCache"</span><span class="o">)</span>
<span class="o">.</span><span class="na">setAtomicityMode</span><span class="o">(</span><span class="nc">CacheAtomicityMode</span><span class="o">.</span><span class="na">TRANSACTIONAL</span><span class="o">));</span>
<span class="nc">IgniteTransactions</span> <span class="n">transactions</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">transactions</span><span class="o">();</span>
<span class="c1">// start a transaction</span>
<span class="k">try</span> <span class="o">(</span><span class="nc">Transaction</span> <span class="n">tx</span> <span class="o">=</span> <span class="n">transactions</span><span class="o">.</span><span class="na">txStart</span><span class="o">())</span> <span class="o">{</span>
<span class="c1">//do some operations</span>
<span class="n">cache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="s">"test value"</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">cache</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="n">cache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="s">"second value"</span><span class="o">);</span>
<span class="n">tx</span><span class="o">.</span><span class="na">commit</span><span class="o">();</span>
<span class="o">}</span>
<span class="k">try</span> <span class="o">{</span>
<span class="c1">//This code here is to wait until the trace is exported to Zipkin.</span>
<span class="c1">//If your application doesn't stop here, you don't need this piece of code.</span>
<span class="nc">Thread</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="mi">5_000</span><span class="o">);</span>
<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">InterruptedException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
<span class="n">e</span><span class="o">.</span><span class="na">printStackTrace</span><span class="o">();</span>
<span class="o">}</span></code></pre>
</div>
</div>
</div>
</div>
</li>
<li>
<p>Open <a href="http://localhost:9411/zipkin" class="bare" target="_blank" rel="noopener">http://localhost:9411/zipkin</a> in your browser and click the search icon.</p>
<div class="openblock">
<div class="content">
<div class="paragraph">
<p>This is what a trace of the transaction looks like:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="/docs/2.9.0/images/trace_in_zipkin.png" alt="trace in zipkin">
</div>
</div>
</div>