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Request latencies +due to network instability is one of the prices we have to pay.</p> + +<p>In monolithic applications, modules are all running in one process and there's no such thing as communication issues among +modules. However, with microservice architecture, services are communicating through a network and we have to deal with all +network related issues, such as delays, timeouts, and partition.</p> + +<p>In addition, given more and more services deployed, we can easily lose the sight on how requests flow through +the web of microservices in our applications. How can we monitor the network latencies and flow of requests through our system?</p> + +<h2 id="zipkin">Zipkin</h2> +<blockquote> + <p><a href="http://zipkin.io/";>Zipkin</a> is a distributed tracing system. It helps gather timing data needed to troubleshoot latency +problems in microservice architectures. It manages both the collection and lookup of this data. Zipkinâs design is based +on the Google <a href="http://research.google.com/pubs/pub36356.html";>Dapper paper</a>.[1]</p> +</blockquote> + +<p>ServiceComb integrates with Zipkin to provide automatic tracing, so that users can focus on fulfilling their business requirements.</p> + +<h2 id="instructions">Instructions</h2> +<p>We will use the <a href="https://github.com/ServiceComb/LinuxCon-Beijing-WorkShop";>workshop demo</a> as an example to illustrate how +to apply distributed tracing with Zipkin.</p> + +<h3 id="adding-dependencies">Adding Dependencies</h3> +<p>A microservice written with ServiceComb Java Chassis just need to add one dependency below to its pom.xml.</p> +<div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><dependency></span> + <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span> + <span class="nt"><artifactId></span>handler-tracing-zipkin<span class="nt"></artifactId></span> + <span class="nt"></dependency></span> + +</code></pre> +</div> + +<p>If the microservice is an API gateway with Spring Cloud + Zuul like manager service in the workshop demo, an additional +dependency has to be included.</p> +<div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><dependency></span> + <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span> + <span class="nt"><artifactId></span>spring-cloud-zuul-zipkin<span class="nt"></artifactId></span> + <span class="nt"></dependency></span> +</code></pre> +</div> + +<h3 id="configuring-tracing-handlers-and-collector">Configuring Tracing Handlers And Collector</h3> +<p>In the configuration file <code class="highlighter-rouge">microservice.yaml</code> , apply tracing handlers and add tracing collector address.</p> +<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span> + <span class="s">handler</span><span class="pi">:</span> + <span class="s">chain</span><span class="pi">:</span> + <span class="s">Consumer</span><span class="pi">:</span> + <span class="s">default</span><span class="pi">:</span> <span class="s">tracing-consumer</span> + <span class="s">Provider</span><span class="pi">:</span> + <span class="s">default</span><span class="pi">:</span> <span class="s">tracing-provider</span> + +<span class="s">servicecomb</span><span class="pi">:</span> + <span class="s">tracing</span><span class="pi">:</span> + <span class="s">collector</span><span class="pi">:</span> + <span class="s">address</span><span class="pi">:</span> <span class="s">http://zipkin.servicecomb.io:9411</span> +</code></pre> +</div> + +<p>That's all! After two configuration additions and no change to a single line of code, distributed tracing with Zipkin is +enabled for microservices written with Java chassis.</p> + +<p><strong>Note</strong> If other dependencies in your project also include zipkin (e.g. Spring Cloud), it may cause runtime error due to +conflict of incompatible zipkin versions. In such a case, you may need to explicitly declare the compatible zipkin version +in your pom.</p> + +<h2 id="a-quick-demo">A Quick Demo</h2> +<p>After enabled tracing in the workshop demo, we are able to showcase the tracing capability locally with docker.</p> +<ol> + <li> + <p>Build all docker images of services in the workshop demo with command <code class="highlighter-rouge">mvn package -DskipTests -Pdocker</code> or <code class="highlighter-rouge">mvn package -DskipTests -Pdocker -Pdocker-machine</code> +if you are using <a href="https://www.docker.com/products/docker-toolbox";>Docker Toolbox</a></p> + </li> + <li> + <p>Run <code class="highlighter-rouge">docker-compose up</code> under workshop demo folder</p> + </li> + <li> + <p>Send requests to the demo application like what we did in the video below</p> + </li> + <li> + <p>Open Zipkin website in a browser, which is hosted in a docker container started at step 2, eg. http://docker.container.ip:9411</p> + </li> +</ol> + +<!-- Courtesy of embedresponsively.com //--> +<div class="responsive-video-container"> + + <iframe src="https://player.youku.com/embed/XMjg1NzQ3NzUzNg"; frameborder="0" allowfullscreen=""></iframe> + +</div> + +<p>Now we should be able to see Zipkin homepage with a few traced services. +<img src="/assets/images/tracing.1.png" alt="zipkin homepage" class="align-center" /></p> + +<p>If we choose manager and click Find Traces button, some traces will be displayed. Please don't mind the system performance +being not very good, since we are running so many services in docker on a laptop manufactured in 2012. +<img src="/assets/images/tracing.2.png" alt="traces of manager service" class="align-center" /></p> + +<p>We are also able to see the spans of an individual trace by clicking on it. +<img src="/assets/images/tracing.3.png" alt="trace spans of manager service" class="align-center" /></p> + +<p>A more detailed timing information will be displayed if we click on any span in the trace. +<img src="/assets/images/tracing.4.png" alt="span details of manager service" class="align-center" /></p> + +<p>Dependency graph of services can be helpful to gain insight on request flow, if we click on the Dependencies menu. +<img src="/assets/images/tracing.5.png" alt="service dependencies" class="align-center" /></p> + +<h2 id="summary">Summary</h2> +<p>As we can see, adding distributed tracing capability to microservices using ServiceComb is as easy as following 2 simple +steps as shown in the instruction section above. Doing so, we leverage the powerful features provided by Zipkin, such as +analyzing timing data to troubleshoot network latencies among our microservices and gaining insight on our service dependencies.</p> + +<h2 id="references">References</h2> +<ul> + <li>[1] <a href="http://zipkin.io/";>Zipkin</a></li> +</ul> + + + </section> + + <footer class="page__meta"> + + + + + + + + + + <p class="page__taxonomy"> + <strong><i class="fa fa-fw fa-tags" aria-hidden="true"></i> Tags: </strong> + <span itemprop="keywords"> + + + + <a href="/tags/#distributed-tracing" class="page__taxonomy-item" rel="tag">distributed tracing</a><span class="sep">, </span> + + + + <a href="/tags/#zipkin" class="page__taxonomy-item" rel="tag">zipkin</a> + + </span> + </p> + + + + + + + + + <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> Updated:</strong> <time datetime="2017-07-17">July 17, 2017</time></p> + + + + </footer> + + <section class="page__share"> + + <h4 class="page__share-title">Share on</h4> + + + <a href="https://twitter.com/intent/tweet?via=ServiceComb&text=Distributed Tracing with ServiceComb and Zipkin /docs/tracing-with-servicecomb/" class="btn btn--twitter" title="Share on Twitter"><i class="fa fa-fw fa-twitter" aria-hidden="true"></i><span> Twitter</span></a> + + <a href="https://www.facebook.com/sharer/sharer.php?u=/docs/tracing-with-servicecomb/"; class="btn btn--facebook" title="Share on Facebook"><i class="fa fa-fw fa-facebook" aria-hidden="true"></i><span> Facebook</span></a> + + <a href="https://plus.google.com/share?url=/docs/tracing-with-servicecomb/"; class="btn btn--google-plus" title="Share on Google Plus"><i class="fa fa-fw fa-google-plus" aria-hidden="true"></i><span> Google+</span></a> + + <a href="https://www.linkedin.com/shareArticle?mini=true&url=/docs/tracing-with-servicecomb/"; class="btn btn--linkedin" title="Share on LinkedIn"><i class="fa fa-fw fa-linkedin" aria-hidden="true"></i><span> LinkedIn</span></a> +</section> + + + + <nav class="pagination"> + + <a href="/cn/docs/go-to-cloud/" class="pagination--pager" title="åä½åºç¨å©ç¨ServiceCombå®ç°å¾®æå¡ååäºåä¹è·¯ +">Previous</a> + + + <a href="/cn/docs/tracing-with-servicecomb/" class="pagination--pager" title="åºäº ServiceComb å Zipkin çåå¸å¼è°ç¨é¾è¿½è¸ª +">Next</a> + + </nav> + + + </div> + + + <div class="page__comments"> + + + <section id="static-comments"> + + <!-- Start static comments --> + <div class="js-comments"> + + </div> + <!-- End static comments --> + + <!-- Start new comment form --> + <h4 class="page__comments-title">Leave a Comment</h4> + <p class="small">Your email address will not be published. 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As Docker does not pull image from remote every time it starts up a container. Hence, the Docker does not know whether the image updated or not. There are two solutions for this:</p> + + <p>(1) Use different image tag every time you upload a image.</p> + + <p>(2) Delete the image in the backend manually.</p> + + <p>P.S. If you use the Huawei Cloudâs orchestration, you can avoid this by setting <em>imagePullPolicy</em> to <em>Always</em>.</p> + </li> + <li> + <p><strong>Q: We encountered this error when using Huawei Public Cloud: <em>WARN com.huaewi.paas.monitor.DataFactory: Upload monitor data error.</em> The configuration we use is as follows:</strong></p> + + <div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span> + <span class="s">monitor</span><span class="pi">:</span> + <span class="s">handler</span><span class="pi">:</span> + <span class="s">chain</span><span class="pi">:</span> + <span class="s">Provider</span><span class="pi">:</span> + <span class="s">default</span><span class="pi">:</span> <span class="s">bizkeeper-provider</span> +</code></pre> + </div> + + <p>A: There are mistakes in your configuration files. <code class="highlighter-rouge">handler</code> should be the child of <code class="highlighter-rouge">cse</code> instead of <code class="highlighter-rouge">monitor</code>. The right configuration should be as follows:</p> + + <div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">cse</span><span class="pi">:</span> + <span class="s">handler</span><span class="pi">:</span> + <span class="s">chain</span><span class="pi">:</span> + <span class="s">Provider</span><span class="pi">:</span> + <span class="s">default</span><span class="pi">:</span> <span class="s">bizkeeper-provider</span> +</code></pre> + </div> + </li> +</ol> + + + </section> + + <footer class="page__meta"> + + + + + + </footer> + + + + + + </div> + + + </article> + + + +</div> + + + <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> + <div align="center" style="margin: 0 0;"> + <ins class="adsbygoogle" + style="display:block; border-bottom: initial;" + data-ad-client="ca-pub-7328585512091257" + data-ad-slot="3049671934" + data-ad-format="auto"></ins> + </div> + + <div class="page__footer"> + <footer> + <!-- start custom footer snippets --> + +<!-- end custom footer snippets --> + <div class="container"> + <div class="row justify-content-md-center"> + + <div class="col"> + <ul> + <p class="header">Resources</p> + <li><a href="/docs/quick-start/">Quick Start</a></li> + <li><a href="/users/user-guide/">User Guide</a></li> + <li><a href="/slides/">Slides</a></li> + <li><a href="/users/faq/">Common Questions</a></li> + </ul> + </div> + <div class="col"> + <ul> + <p class="header">Contribute</p> + <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/issues/new?title=Issue with _faqs/huawei-cloud-faq.md">Report a Doc Issue</a></li> + <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/edit/master/_faqs/huawei-cloud-faq.md";>Edit This Page on Github</a></li> + <li><a href="/developers/submit-codes/">Code Submit Guide</a></li> + </ul> + </div> + <div class="col"> + <ul class="social-icons"> + <p class="header">Community</p> + <li> + <a href="https://groups.google.com/forum/#!forum/servicecomb-developers"; target="_blank"><span class="group">Dev</span></a> | + <a href="https://groups.google.com/forum/#!forum/servicecomb-users"; target="_blank">User</span></a> + </li> + <li> + <a href="http://github.com/ServiceComb"; target="_blank"><span class="github">Github</span></a> + </li> + <li> + <a href="https://twitter.com/ServiceComb"; target="_blank"><span class="twitter">Twitter</span></a> + </li> + <li> + <a href="/feed.xml" target="_blank"><span class="rss">Feed</span></a> + </li> + </ul> + </div> + </div> +</div> +<div class="page__footer-bottom"> + <div>© 2017 Apache incubator ServiceComb. 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This can refer to the <em>manger</em> implementation of <a href="https://github.com/ServiceComb/LinuxCon-Beijing-WorkShop";>LinuxCon-Beijing-Workshop</a>.</p> + </li> + <li> + <p><strong>Q: Do gateway need to configure assembly like the other microservices? Is <em>/maven/gateway</em> the default path of the docker maven plugin?</strong></p> + + <p>A: Yes. Docker maven plugin relies on the assembly files to generate docker image. <em>/maven</em> is the default path of docker maven plugin and <em>/gateway</em> is the path defined in the assembly file.</p> + </li> + <li> + <p><strong>Q: Are there any restrictions of the return type of our API? Should it be the type of ResponseEntity?</strong></p> + + <p>A: No, examples can refer to <a href="https://github.com/ServiceComb/java-chassis/blob/master/integration-tests/springmvc-tests/src/test/java/io/servicecomb/demo/springmvc/tests/SpringMvcIntegrationTestBase.java#L145";>the implementation of integration-test</a> in java-chassis.</p> + </li> + <li> + <p><strong>Q: Our API can not be accessed after microservices are up. It just returns <em>404 Not Found</em>. The codes we use is as follows:</strong></p> + + <div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@RestController</span> +<span class="nd">@RestSchema</span><span class="o">(</span><span class="n">schemaId</span> <span class="o">=</span> <span class="s">"worker"</span><span class="o">)</span> +<span class="kd">public</span> <span class="kd">class</span> <span class="nc">WorkerController</span> <span class="o">{</span> + <span class="nd">@RequestMapping</span><span class="o">(</span><span class="n">value</span><span class="o">=</span><span class="s">"/count"</span><span class="o">,</span> <span class="n">method</span><span class="o">=</span><span class="n">RequestMethod</span><span class="o">.</span><span class="na">GET</span><span class="o">)</span> + <span class="kd">public</span> <span class="kt">int</span> <span class="nf">getWorkerNumbers</span><span class="o">()</span> <span class="o">{</span> + <span class="o">...</span> + <span class="o">}</span> +<span class="o">}</span> +</code></pre> + </div> + + <p>A: Without specifying the base path, ServiceComb will use the classname as the base path. Hence, the path should be <code class="highlighter-rouge">/WorkerController/count</code> in the previous code. If you want to access path like <code class="highlighter-rouge">/count</code>, you need to specify base path as <code class="highlighter-rouge">/</code> as follows:</p> + <div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@RequestMapping</span><span class="o">(</span><span class="n">value</span> <span class="o">=</span> <span class="s">"/"</span><span class="o">)</span> +<span class="kd">public</span> <span class="kd">class</span> <span class="nc">WorkerController</span> <span class="o">{}</span> +</code></pre> + </div> + </li> + <li> + <p><strong>Q: What's the default base path if I have not declared the value of RequestMapping annotation?</strong></p> + + <p>A: Supposed the class name of your controller is <em>HelloController</em>, the base path is /HelloController.</p> + </li> +</ol> + + + </section> + + <footer class="page__meta"> + + + + + + </footer> + + + + + + </div> + + + </article> + + + +</div> + + + <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> + <div align="center" style="margin: 0 0;"> + <ins class="adsbygoogle" + style="display:block; border-bottom: initial;" + data-ad-client="ca-pub-7328585512091257" + data-ad-slot="3049671934" + data-ad-format="auto"></ins> + </div> + + <div class="page__footer"> + <footer> + <!-- start custom footer snippets --> + +<!-- end custom footer snippets --> + <div class="container"> + <div class="row justify-content-md-center"> + + <div class="col"> + <ul> + <p class="header">Resources</p> + <li><a href="/docs/quick-start/">Quick Start</a></li> + <li><a href="/users/user-guide/">User Guide</a></li> + <li><a href="/slides/">Slides</a></li> + <li><a href="/users/faq/">Common Questions</a></li> + </ul> + </div> + <div class="col"> + <ul> + <p class="header">Contribute</p> + <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/issues/new?title=Issue with _faqs/faq.md">Report a Doc Issue</a></li> + <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/edit/master/_faqs/faq.md";>Edit This Page on Github</a></li> + <li><a href="/developers/submit-codes/">Code Submit Guide</a></li> + </ul> + </div> + <div class="col"> + <ul class="social-icons"> + <p class="header">Community</p> + <li> + <a href="https://groups.google.com/forum/#!forum/servicecomb-developers"; target="_blank"><span class="group">Dev</span></a> | + <a href="https://groups.google.com/forum/#!forum/servicecomb-users"; target="_blank">User</span></a> + </li> + <li> + <a href="http://github.com/ServiceComb"; target="_blank"><span class="github">Github</span></a> + </li> + <li> + <a href="https://twitter.com/ServiceComb"; target="_blank"><span class="twitter">Twitter</span></a> + </li> + <li> + <a href="/feed.xml" target="_blank"><span class="rss">Feed</span></a> + </li> + </ul> + </div> + </div> +</div> +<div class="page__footer-bottom"> + <div>© 2017 Apache incubator ServiceComb. 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