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Marcin Grzejszczak
2017-08-29 10:49:18 +02:00
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<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>3.&nbsp;Sampling</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="_features.html" title="2.&nbsp;Features"><link rel="next" href="_instrumentation.html" title="4.&nbsp;Instrumentation"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.&nbsp;Sampling</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="_features.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="_instrumentation.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_sampling" href="#_sampling"></a>3.&nbsp;Sampling</h1></div></div></div><p>In distributed tracing the data volumes can be very high so sampling
<title>4.&nbsp;Sampling</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="_features.html" title="3.&nbsp;Features"><link rel="next" href="_instrumentation.html" title="5.&nbsp;Instrumentation"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.&nbsp;Sampling</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="_features.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="_instrumentation.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_sampling" href="#_sampling"></a>4.&nbsp;Sampling</h1></div></div></div><p>In distributed tracing the data volumes can be very high so sampling
can be important (you usually don&#8217;t need to export all spans to get a
good picture of what is happening). Spring Cloud Sleuth has a
<code class="literal">Sampler</code> strategy that you can implement to take control of the
@@ -23,4 +23,4 @@ For backwards compatibility reasons we&#8217;re not changing the property name.<
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">new</span> AlwaysSampler();
}</pre><div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Tip"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="images/tip.png"></td><th align="left">Tip</th></tr><tr><td align="left" valign="top"><p>You can set the HTTP header <code class="literal">X-B3-Flags</code> to <code class="literal">1</code> or when doing messaging you can
set <code class="literal">spanFlags</code> header to <code class="literal">1</code>. Then the current span will be forced to be exportable
regardless of the sampling decision.</p></td></tr></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="_features.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="_instrumentation.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">2.&nbsp;Features&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="spring-cloud-sleuth.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;4.&nbsp;Instrumentation</td></tr></table></div></body></html>
regardless of the sampling decision.</p></td></tr></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="_features.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="_instrumentation.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.&nbsp;Features&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="spring-cloud-sleuth.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;5.&nbsp;Instrumentation</td></tr></table></div></body></html>