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| <meta itemprop="headline" content="1.0.0-m1版本写文件扩展和示例"> |
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| <h1 class="page__title" itemprop="headline">1.0.0-m1版本写文件扩展和示例 |
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| <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> --> |
| <ul class="toc__menu" id="markdown-toc"> |
| <li><a href="#背景" id="markdown-toc-背景">背景</a></li> |
| <li><a href="#全局配置" id="markdown-toc-全局配置">全局配置</a></li> |
| <li><a href="#依赖和代码使用" id="markdown-toc-依赖和代码使用">依赖和代码使用</a></li> |
| <li><a href="#使用spring-boot-starter开发注意事项" id="markdown-toc-使用spring-boot-starter开发注意事项">使用Spring Boot Starter开发注意事项</a></li> |
| <li><a href="#运行示例" id="markdown-toc-运行示例">运行示例</a></li> |
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| <p>微服务框架从0.5.0版本开始支持监控功能Metrics，1.0.0-m1版本正式发布，请通过查看用户手册和<a href="https://github.com/apache/servicecomb-java-chassis/releases">Release Note</a>获取更多信息，我们也会继续追加新特性新功能，欢迎订阅ServiceComb邮件列表(dev-subscribe@servicecomb.apache.org)参与讨论。</p> |
| |
| <h2 id="背景">背景</h2> |
| <p>0.5.0版本的foundation-metrics实现了将采集到的Metrics数据写入文件，在1.0.0-m1中，此功能以Sample的形式移动到了samples/metrics-write-file-sample中；<br /> |
| 从1.0.0-m1版本开始支持输出Operation级别的Metric，因此无法通过固定配置的方式配置日志输出，将采用代码的方式在运行时为每一个Metric自动创建专用的RollingFileAppender。 |
| 示例代码包含如下三个模块：</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Module名</th> |
| <th style="text-align: left">描述</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">metrics-write-file</td> |
| <td style="text-align: left">定期获取Metrics数据写入文件主模块</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">metrics-write-file-config-log4j-springboot</td> |
| <td style="text-align: left">使用Log4j的RollingFileAppender写文件</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">metrics-write-file-config-log4j2-springboot</td> |
| <td style="text-align: left">使用Log4j2的RollingFileAppender写文件</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p><em>暂未提供logback的示例，参考Log4j和Log4j2的例子可以很容易实现</em></p> |
| |
| <h2 id="全局配置">全局配置</h2> |
| <p>与0.5.0类似，需要在microservice.yaml中添加如下配置项：</p> |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">APPLICATION_ID</span><span class="pi">:</span> <span class="s">demo</span> |
| <span class="na">service_description</span><span class="pi">:</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">demoService</span> |
| <span class="na">version</span><span class="pi">:</span> <span class="s">0.0.1</span> |
| |
| <span class="na">servicecomb</span><span class="pi">:</span> |
| <span class="na">metrics</span><span class="pi">:</span> |
| <span class="c1">#1.0.0-m1日志输出间隔配置项，单位毫秒</span> |
| <span class="na">window_time</span><span class="pi">:</span> <span class="m">5000</span> |
| <span class="c1">#如果metric是浮点数，输出结果保留几位小数，默认为1</span> |
| <span class="na">round_places</span><span class="pi">:</span> <span class="m">1</span> |
| <span class="na">file</span><span class="pi">:</span> |
| <span class="c1">#日志根目录</span> |
| <span class="na">root_path</span><span class="pi">:</span> <span class="s">./log/metric/</span> |
| <span class="na">rolling</span><span class="pi">:</span> |
| <span class="c1">#最大保留文件数</span> |
| <span class="na">max_file_count</span><span class="pi">:</span> <span class="m">10</span> |
| <span class="c1">#文件最大大小，单位可以是KB，MB和GB</span> |
| <span class="na">max_file_size </span><span class="pi">:</span> <span class="s">10MB</span> |
| </code></pre></div></div> |
| <p>与0.5.0版本配置的比较：</p> |
| <ol> |
| <li>旧版本使用servicecomb.metrics.polltime(单位秒)配置文件输出间隔，1.0.0-m1版本中旧版本功能仍然存在；</li> |
| <li>新版本添加依赖即启用，因此没有老版本类似servicecomb.metrics.file.enabled开关，这个开关可以用于关闭老版本输出（老版本预定在下一个版本1.0.0-m2中彻底移除）；</li> |
| <li>新版本无需配置servicecomb.metrics.filename_prefix，默认为微服务的appId.serviceName；</li> |
| <li>新版本增加了对rolling file的设置，这些配置在老版本是配置在日志的xml或properties文件里的。</li> |
| </ol> |
| |
| <h2 id="依赖和代码使用">依赖和代码使用</h2> |
| <ol> |
| <li>首先需要引入metrics-write-file模块，这个模块包含了获取Metrics数据并转化为指定格式后写文件的逻辑： |
| <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.samples<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>metrics-write-file<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| </code></pre></div> </div> |
| <p><em>也可以参考其中的实现修改代码或复制代码到项目中。</em></p> |
| </li> |
| <li>metrics-write-file模块不包含动态生成写文件RollingFileAppender的代码，根据项目实际使用的日志实现，如果是log4j，拷贝metrics-write-file-log4j-springboot模块中的Log4JMetricsFileWriter，如果是log4j2，拷贝metrics-write-file-log4j2-springboot模块中的Log4J2MetricsFileWriter。 <br /> |
| <em>也可以参考其中的实现修改代码或自己实现FileWriter。</em></li> |
| </ol> |
| |
| <h2 id="使用spring-boot-starter开发注意事项">使用Spring Boot Starter开发注意事项</h2> |
| <p>Java Chassis集成了Spring Boot Starter，如果使用Spring Boot Starter启动微服务同时又使用Log4j作为日志实现，则需要处理依赖问题，请参考samples/metrics-write-file-sample/metrics-write-file-log4j-springboot项目：</p> |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="c"><!--need exclusion log4j-over-slf4j--></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.springframework.boot<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>spring-boot-starter<span class="nt"></artifactId></span> |
| <span class="nt"><exclusions></span> |
| <span class="nt"><exclusion></span> |
| <span class="nt"><groupId></span>org.slf4j<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>log4j-over-slf4j<span class="nt"></artifactId></span> |
| <span class="nt"></exclusion></span> |
| <span class="nt"></exclusions></span> |
| <span class="nt"></dependency></span> |
| |
| <span class="c"><!--servicecomb spring boot starter--></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>spring-boot-starter-provider<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| </code></pre></div></div> |
| <p>Spring Boot Starter中包含了log4j-over-slf4j，这个Log Bridge并没有完全实现log4j的所有接口，包括RollingFileAppender，所以我们需要排除它让slf4j直接调用log4j而不是这个Log Bridge，请确定这种排除对你的系统不会有影响，关于log4j-over-slf4j的更多信息可以参考<a href="https://www.slf4j.org/legacy.html#log4j-over-slf4j">这篇文章</a>。</p> |
| |
| <h2 id="运行示例">运行示例</h2> |
| <p>metrics-write-file-config-log4j-springboot和metrics-write-file-config-log4j2-springboot都是可以直接运行的示例项目，使用ServiceApplication启动完成后，观察输出目录target/metric/下会生成很多Metrics文件，如果在浏览器中刷新几下http://localhost:8080/f 请求，则可以看到对应的Operation的Metrics文件也会在目录下自动生成。 <br /> |
| <img src="/assets/images/MetricsWriteFileResult.png" alt="MetricsWriteFileResult" /></p> |
| |
| <h2 id="q--a">Q & A</h2> |
| <ol> |
| <li> |
| <p>在新的1.0.0-m1版本里，我是否还需要在日志配置文件（例如log4j2.xml） 中追加任何修改吗？<br /> |
| 不需要，会在运行态自动为metric生成对应的RollingFileAppender，并且这个Appender与你日志配置的Appenders没有任何关系。</p> |
| </li> |
| <li> |
| <p>我发现Log4J2MetricsFileWriter中创建RollingFileAppender是使用一个标记为过期的createAppender方法，为什么不使用新的的newBuilder … build模式？<br /> |
| 开发的时候发现newBuilder … build与微服务框架存在某种冲突导致不可用，另外，官方文档的<a href="https://logging.apache.org/log4j/2.x/manual/customconfig.html">示例代码</a>仍然使用的是createAppender，缺乏资料也给定位问题造成了一定的麻烦；我们未来会去改进，已标记TODO。</p> |
| </li> |
| <li> |
| <p>集成后出现RollingFileAppender抛ClassNotFoundException之类的错误？<br /> |
| 众所周知，Java开发主流都使用slf4j或jcl做为日志框架，然后桥接具体的日志实现，例如log4j、log4j2和logback，通过配置文件初始化日志组件，达到随意更换弱绑定的效果，并不推荐编码方式创建日志组件。 |
| 但由于1.0.0-m1版本开始支持Operation级别的Metric输出，不同的微服务Operation不同，并且单Operation会有15+以上的Metric，因此手动配置已不具备可操作性，必须通过Coding的方式动态生成RollingFileAppender。 |
| 如果你的项目中包含类似log4j-over-slf4j这样的Bridging依赖，就很可能会出现这样的问题，请使用mvn dependency:tree检查。</p> |
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