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| <meta itemprop="headline" content="ServiceComb + Zipkin : 使用篇——自定义追踪"> |
| <meta itemprop="description" content="本篇将介绍如何使用 ServiceComb 和 Zipkin 实现自定义追踪"> |
| <meta itemprop="datePublished" content="January 23, 2019"> |
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| <h1 class="page__title" itemprop="headline">ServiceComb + Zipkin : 使用篇——自定义追踪 |
| </h1> |
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| 少于 1 分钟 阅读 |
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| <h1 id="自定义追踪功能">自定义追踪功能</h1> |
| <p>ServiceComb 支持用户在程序中的指定位置处增加追踪数据，可以实现更细力度的追踪。</p> |
| <h2 id="使用步骤">使用步骤</h2> |
| <p>添加依赖</p> |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>tracing-zipkin<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| </code></pre></div></div> |
| <p>在程序入口或者配置处添加 <code class="highlighter-rouge">@EnableZipkinTracing</code> 注解</p> |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">org.apache.servicecomb.tracing.zipkin.EnableZipkinTracing</span><span class="o">;</span> |
| |
| <span class="nd">@SpringBootApplication</span> |
| <span class="nd">@EnableServiceComb</span> |
| <span class="nd">@EnableZipkinTracing</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorApplication</span> <span class="o">{</span> |
| |
| <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="nc">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span> |
| <span class="nc">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="nc">CalculatorApplication</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">args</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </code></pre></div></div> |
| |
| <p>在服务程序中的调用方法处添加 <code class="highlighter-rouge">@Span</code> 注解</p> |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">org.apache.servicecomb.tracing.Span</span><span class="o">;</span> |
| |
| <span class="nd">@Service</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorServiceImpl</span> <span class="kd">implements</span> <span class="nc">CalculatorService</span> <span class="o">{</span> |
| |
| <span class="cm">/** |
| * {@inheritDoc} |
| */</span> |
| <span class="nd">@Span</span> |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(</span><span class="n">height</span> <span class="o"><=</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">weight</span> <span class="o"><=</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">throw</span> <span class="k">new</span> <span class="nf">IllegalArgumentException</span><span class="o">(</span><span class="s">"Arguments must be above 0"</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kt">double</span> <span class="n">heightInMeter</span> <span class="o">=</span> <span class="n">height</span> <span class="o">/</span> <span class="mi">100</span><span class="o">;</span> |
| <span class="kt">double</span> <span class="n">bmi</span> <span class="o">=</span> <span class="n">weight</span> <span class="o">/</span> <span class="o">(</span><span class="n">heightInMeter</span> <span class="o">*</span> <span class="n">heightInMeter</span><span class="o">);</span> |
| <span class="k">return</span> <span class="nf">roundToOnePrecision</span><span class="o">(</span><span class="n">bmi</span><span class="o">);</span> |
| <span class="o">}</span> |
| |
| <span class="kd">private</span> <span class="kt">double</span> <span class="nf">roundToOnePrecision</span><span class="o">(</span><span class="kt">double</span> <span class="n">value</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="k">new</span> <span class="nf">BigDecimal</span><span class="o">(</span><span class="n">value</span><span class="o">).</span><span class="na">setScale</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="nc">RoundingMode</span><span class="o">.</span><span class="na">HALF_UP</span><span class="o">).</span><span class="na">doubleValue</span><span class="o">();</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </code></pre></div></div> |
| <p>使用限制：自定义跟踪仅支持注解请求线程中的方法调用，且带有<code class="highlighter-rouge">@Span</code>的类必须是spring管理的bean。</p> |
| <h2 id="快速演示">快速演示</h2> |
| <p>下面使用java-chassis/samples/bmi 程序演示，如何使用自定义追踪功能定位应用程序中的问题？</p> |
| <ol> |
| <li>正常运行bmi程序，结果如下<br /> |
| <img src="/assets/images/zipkin/demo-bmi-run.png" alt="正常结果" /> |
| <img src="/assets/images/zipkin/zipkin-track-bmi.png" alt="zipkin正常追踪结果" /></li> |
| <li>在bmi程序的calculator服务的calculate方法处，增加一块进程休眠代码（模拟实际工作中调用当前线程处理其他业务的情景），如下 |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span> |
| |
| <span class="k">try</span><span class="o">{</span> |
| <span class="nc">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">sleep</span><span class="o">(</span><span class="mi">5000</span><span class="o">);</span> |
| <span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">Exception</span> <span class="n">e</span><span class="o">){</span> |
| |
| <span class="o">}</span> |
| |
| <span class="k">if</span> <span class="o">(</span><span class="n">height</span> <span class="o"><=</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">weight</span> <span class="o"><=</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">throw</span> <span class="k">new</span> <span class="nf">IllegalArgumentException</span><span class="o">(</span><span class="s">"Arguments must be above 0"</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="kt">double</span> <span class="n">heightInMeter</span> <span class="o">=</span> <span class="n">height</span> <span class="o">/</span> <span class="mi">100</span><span class="o">;</span> |
| <span class="kt">double</span> <span class="n">bmi</span> <span class="o">=</span> <span class="n">weight</span> <span class="o">/</span> <span class="o">(</span><span class="n">heightInMeter</span> <span class="o">*</span> <span class="n">heightInMeter</span><span class="o">);</span> |
| <span class="k">return</span> <span class="nf">roundToOnePrecision</span><span class="o">(</span><span class="n">bmi</span><span class="o">);</span> |
| <span class="o">}</span> |
| |
| </code></pre></div> </div> |
| </li> |
| <li>运行bmi程序，出现如下异常结果。查看zipkin追踪情况和程序报错信息，可以初步确定问题由 bmi/calculator 服务超时未响应导致<br /> |
| <img src="/assets/images/zipkin/demo-bmi-run-error.png" alt="异常结果" /> |
| <img src="/assets/images/zipkin/zipkin-track-bmi-error.png" alt="zipkin追踪情况" /> |
| <img src="/assets/images/zipkin/error-message.png" alt="程序报错信息" /></li> |
| <li>使用自定义追踪功能，定位问题具体位置 |
| 在calculator服务中配置自定义追踪功能，添加注解 <code class="highlighter-rouge">@Span</code>在calculator服务的方法上 。运行bmi程序，zipkin追踪耗时情况如下。根据span占用的时间戳，可以确定延时问题出现在calculate方法处，点击span，可查看call.path 获取calculate方法的具体位置。 |
| <img src="/assets/images/zipkin/zipkin-customized-track-bmi.png" alt="zipkin追踪异常情况" /> |
| <img src="/assets/images/zipkin/zipkin-track-span.png" alt="span信息信息" /> |
| <h2 id="总结">总结</h2> |
| <p>从上面的示例可以看出，通过配置ServiceComb的自定义追踪功能，可以实现对服务中调用方法、接口的追踪，实现更细力度化的追踪。这对于我们监控服务内部调用、定位服务中的延时问题等非常有帮助。</p> |
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