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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
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| <a href="/docs/2.9.0/SQL/ODBC/specification" |
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| >Data Types</a> |
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| <a href="/docs/2.9.0/SQL/ODBC/error-codes" |
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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"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"tracingSpi"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.tracing.opencensus.OpenCensusTracingSpi"</span><span class="nt">/></span> |
| <span class="nt"></property></span> |
| |
| <span class="nt"></bean></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"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">></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"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">>(</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> |
| </div> |
| </li> |
| </ol> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="analyzing-trace-data">Analyzing Trace Data</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>A trace is recorded information about the execution of a specific event. |
| Each trace consists of a tree of <em>spans</em>. |
| A span is an individual unit of work performed by the system in order to process the event.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Because of the distributed nature of Ignite, an operation usually involves multiple nodes. |
| Therefore, a trace can include spans from multiple nodes. |
| Each span always contains the information about the node where the corresponding operation was executed.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In the image of the transaction trace presented above, you can see that the trace contains the spans associated with the following operations:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>acquire locks (<code>transactions.colocated.lock.map</code>),</p> |
| </li> |
| <li> |
| <p>get (<code>transactions.near.enlist.read</code>),</p> |
| </li> |
| <li> |
| <p>put (<code>transactions.near.enlist.write</code>),</p> |
| </li> |
| <li> |
| <p>commit (<code>transactions.commit</code>), and</p> |
| </li> |
| <li> |
| <p>close (<code>transactions.close</code>).</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The commit operation, in turn, consists of two operations: prepare and finish.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can click on each span to view the annotations and tags attached to it.</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.0/images/span.png" alt="Span"> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2020 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. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#configuring-tracing">Configuring Tracing</a></li> |
| <li><a href="#enabling-trace-sampling">Enabling Trace Sampling</a> |
| <ul class="sectlevel2"> |
| <li><a href="#using-control-script">Using Control Script</a></li> |
| <li><a href="#programmatically">Programmatically</a></li> |
| </ul> |
| </li> |
| <li><a href="#exporting-traces">Exporting Traces</a></li> |
| <li><a href="#analyzing-trace-data">Analyzing Trace Data</a></li> |
| </ul> |
| |
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