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<title>1.&nbsp;Introduction</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="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi__additional_resources.html" title="2.&nbsp;Additional Resources"></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">1.&nbsp;Introduction</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__additional_resources.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_introduction" href="#_introduction"></a>1.&nbsp;Introduction</h1></div></div></div><p>Spring Cloud Sleuth implements a distributed tracing solution for <a class="link" href="http://cloud.spring.io" target="_top">Spring Cloud</a>.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_terminology" href="#_terminology"></a>1.1&nbsp;Terminology</h2></div></div></div><p>Spring Cloud Sleuth borrows <a class="link" href="http://research.google.com/pubs/pub36356.html" target="_top">Dapper&#8217;s</a> terminology.</p><p><span class="strong"><strong>Span</strong></span>: The basic unit of work. For example, sending an RPC is a new span, as is sending a response to an RPC.
<title>1.&nbsp;Introduction</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="multi_pr01.html" title=""><link rel="next" href="multi__additional_resources.html" title="2.&nbsp;Additional Resources"></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">1.&nbsp;Introduction</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_pr01.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__additional_resources.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_introduction" href="#_introduction"></a>1.&nbsp;Introduction</h1></div></div></div><p>Spring Cloud Sleuth implements a distributed tracing solution for <a class="link" href="http://cloud.spring.io" target="_top">Spring Cloud</a>.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_terminology" href="#_terminology"></a>1.1&nbsp;Terminology</h2></div></div></div><p>Spring Cloud Sleuth borrows <a class="link" href="http://research.google.com/pubs/pub36356.html" target="_top">Dapper&#8217;s</a> terminology.</p><p><span class="strong"><strong>Span</strong></span>: The basic unit of work. For example, sending an RPC is a new span, as is sending a response to an RPC.
Spans are identified by a unique 64-bit ID for the span and another 64-bit ID for the trace the span is a part of.
Spans also have other data, such as descriptions, timestamped events, key-value annotations (tags), the ID of the span that caused them, and process IDs (normally IP addresses).</p><p>Spans can be started and stopped, and they keep track of their timing information.
Once you create a span, you must stop it at some point in the future.</p><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>The initial span that starts a trace is called a <code class="literal">root span</code>. The value of the ID