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| <li><a href="#负载均衡策略" id="markdown-toc-负载均衡策略">负载均衡策略</a></li> |
| <li><a href="#限流策略" id="markdown-toc-限流策略">限流策略</a> <ul> |
| <li><a href="#场景描述" id="markdown-toc-场景描述">场景描述</a></li> |
| <li><a href="#注意事项" id="markdown-toc-注意事项">注意事项</a></li> |
| <li><a href="#配置说明" id="markdown-toc-配置说明">配置说明</a></li> |
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| <li><a href="#降级策略" id="markdown-toc-降级策略">降级策略</a> <ul> |
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| <li><a href="#配置说明-1" id="markdown-toc-配置说明-1">配置说明</a></li> |
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| <h2 id="负载均衡策略">负载均衡策略</h2> |
| <p>本章节的内容已过时,新的负载均衡策略说明见<a href="https://docs.servicecomb.io/java-chassis/zh_CN/references-handlers/loadbalance.html">负载均衡</a></p> |
| |
| <h2 id="限流策略">限流策略</h2> |
| <h3 id="场景描述">场景描述</h3> |
| |
| <p>用户在provider端使用限流策略,可以限制指定微服务向其发送请求的频率,达到限制每秒钟最大请求数量的效果。</p> |
| |
| <h3 id="注意事项">注意事项</h3> |
| |
| <ol> |
| <li>限流策略的控制并不是绝对精确的,可能会有少量误差。</li> |
| <li>provider端的流量控制是业务层面的功能,不是安全意义上的流量控制,如需防止DDoS攻击,需要结合其他的一系列措施。</li> |
| <li>流量控制是微服务级的,不是进程级的。</li> |
| </ol> |
| |
| <h3 id="配置说明">配置说明</h3> |
| |
| <p> 限流策略配置在microservice.yaml文件中,相关配置项见表2。要开启服务提供者端的限流策略,还需要在处理链中配置服务端限流handler,并添加pom依赖。</p> |
| |
| <p> microservice.yaml配置示例如下:</p> |
| |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">servicecomb</span><span class="pi">:</span> |
| <span class="na">handler</span><span class="pi">:</span> |
| <span class="na">chain</span><span class="pi">:</span> |
| <span class="na">Provider</span><span class="pi">:</span> |
| <span class="na">default</span><span class="pi">:</span> <span class="s">qps-flowcontrol-provider</span> |
| </code></pre></div></div> |
| |
| <p> 添加handler-flowcontrol-qps的pom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>handler-flowcontrol-qps<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>1.0.0-m1<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| </code></pre></div></div> |
| |
| <p> <strong>表2 QPS流控配置项说明</strong></p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">配置项</th> |
| <th style="text-align: left">默认值</th> |
| <th style="text-align: left">取值范围</th> |
| <th style="text-align: left">是否必选</th> |
| <th style="text-align: left">含义</th> |
| <th style="text-align: left">注意</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">servicecomb.flowcontrol.Provider.qps.enabled</td> |
| <td style="text-align: left">true</td> |
| <td style="text-align: left">true/false</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">是否启用Provider流控</td> |
| <td style="text-align: left">-</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.flowcontrol.Provider.qps.limit.[ServiceName]</td> |
| <td style="text-align: left">2147483647(max int)</td> |
| <td style="text-align: left">(0,2147483647],整形</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">每秒钟允许的请求数</td> |
| <td style="text-align: left">仅支持microservice一个级别的配置</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.flowcontrol.Provider.qps.global.limit</td> |
| <td style="text-align: left">2147483647(max int)</td> |
| <td style="text-align: left">(0,2147483647],整形</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">provider接受请求流量的全局配置</td> |
| <td style="text-align: left">没有具体到微服务的配置时,此配置生效</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2 id="降级策略">降级策略</h2> |
| <h3 id="概念阐述">概念阐述</h3> |
| |
| <p>降级策略是当服务请求异常时,微服务所采用的异常处理策略。降级策略有三个相关的技术概念:“隔离”、“熔断”、“容错”:</p> |
| |
| <p>降级策略有三个相关的技术概念:“隔离”、“熔断”、“容错”:</p> |
| <ul> |
| <li>“隔离”是一种异常检测机制,常用的检测方法是请求超时、并发量过大等。一般的设置参数包括超时时间、同时并发请求个数等。</li> |
| <li>“熔断”是一种异常反应机制,“熔断”依赖于“隔离”。熔断通常基于错误率来实现。一般的设置参数包括统计请求的个数、错误率等。</li> |
| <li>“容错”是一种异常处理机制,“容错”依赖于“熔断”。熔断以后,会调用“容错”的方法。一般的设置参数包括调用容错方法的次数等。</li> |
| </ul> |
| |
| <p>把这些概念联系起来:当”隔离”措施检测到N次请求中共有M次错误的时候,”熔断”不再发送后续请求,调用”容错”处理函数。这个技术上的定义,是和Netflix Hystrix一致的,通过这个定义,非常容易理解它提供的配置项,参考:<a href="https://github.com/Netflix/Hystrix/wiki/Configuration">https://github.com/Netflix/Hystrix/wiki/Configuration</a>。当前ServiceComb提供两种容错方式,分别为返回null值和抛出异常。</p> |
| |
| <h3 id="场景描述-1">场景描述</h3> |
| |
| <p>用户通过配置降级策略,可以设置微服务的异常处理策略。</p> |
| |
| <h3 id="配置说明-1">配置说明</h3> |
| |
| <p> 配置项如表所示。</p> |
| |
| <p> <strong>表3 降级策略相关配置项说明</strong></p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">配置项</th> |
| <th style="text-align: left">默认值</th> |
| <th style="text-align: left">取值范围</th> |
| <th style="text-align: left">是否必选</th> |
| <th style="text-align: left">含义</th> |
| <th style="text-align: left">注意</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">servicecomb.isolation.timeout.enabled</td> |
| <td style="text-align: left">FALSE</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">是否启用超时检测</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.isolation.timeoutInMilliseconds</td> |
| <td style="text-align: left">30000</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">超时时间阈值</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.isolation.maxConcurrentRequests</td> |
| <td style="text-align: left">10</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">最大并发数阈值</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.enabled</td> |
| <td style="text-align: left">TRUE</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">是否启用熔断措施</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.forceOpen</td> |
| <td style="text-align: left">FALSE</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">不管失败次数,都进行熔断</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.forceClosed</td> |
| <td style="text-align: left">FALSE</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">任何时候都不熔断</td> |
| <td style="text-align: left">当与forceOpen同时配置时,forceOpen优先。</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.sleepWindowInMilliseconds</td> |
| <td style="text-align: left">15000</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">熔断后,多长时间恢复</td> |
| <td style="text-align: left">恢复后,会重新计算失败情况。注意:如果恢复后的调用立即失败,那么会立即重新进入熔断。</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.requestVolumeThreshold</td> |
| <td style="text-align: left">20</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">10s内统计错误发生次数阈值,超过阈值则触发熔断</td> |
| <td style="text-align: left">由于10秒还会被划分为10个1秒的统计周期,经过1s中后才会开始计算错误率,因此从调用开始至少经过1s,才会发生熔断。</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.circuitBreaker.errorThresholdPercentage</td> |
| <td style="text-align: left">50</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">错误率阈值,达到阈值则触发熔断</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.fallback.enabled</td> |
| <td style="text-align: left">TRUE</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">是否启用出错后的故障处理措施</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.fallback.maxConcurrentRequests</td> |
| <td style="text-align: left">10</td> |
| <td style="text-align: left">-</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">并发调用容错处理措施(servicecomb.fallbackpolicy.policy)的请求数,超过这个值则不再调用处理措施,直接返回异常</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| <tr> |
| <td style="text-align: left">servicecomb.fallbackpolicy.policy</td> |
| <td style="text-align: left">throwexception</td> |
| <td style="text-align: left">returnnulll | throwexception</td> |
| <td style="text-align: left">否</td> |
| <td style="text-align: left">出错后的处理策略</td> |
| <td style="text-align: left"> </td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p class="notice--warning"><strong>注意:</strong> 谨慎使用servicecomb.isolation.timeout.enabled=true。因为系统处理链都是异步执行,中间处理链的返回,会导致后面处理链的逻辑处理效果丢失。尽可能将servicecomb.isolation.timeout.enabled保持默认值false,并且正确设置网络层超时时间servicecomb.request.timeout=30000。</p> |
| |
| <h2 id="示例代码">示例代码</h2> |
| |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">servicecomb</span><span class="pi">:</span> |
| <span class="na">handler</span><span class="pi">:</span> |
| <span class="na">chain</span><span class="pi">:</span> |
| <span class="na">Consumer</span><span class="pi">:</span> |
| <span class="na">default</span><span class="pi">:</span> <span class="s">bizkeeper-consumer</span> |
| <span class="na">isolation</span><span class="pi">:</span> |
| <span class="na">Consumer</span><span class="pi">:</span> |
| <span class="na">timeout</span><span class="pi">:</span> |
| <span class="na">enabled</span><span class="pi">:</span> <span class="no">true</span> |
| <span class="na">timeoutInMilliseconds</span><span class="pi">:</span> <span class="m">30000</span> |
| <span class="na">circuitBreaker</span><span class="pi">:</span> |
| <span class="na">Consumer</span><span class="pi">:</span> |
| <span class="na">sleepWindowInMilliseconds</span><span class="pi">:</span> <span class="m">15000</span> |
| <span class="na">requestVolumeThreshold</span><span class="pi">:</span> <span class="m">20</span> |
| <span class="na">fallback</span><span class="pi">:</span> |
| <span class="na">Consumer</span><span class="pi">:</span> |
| <span class="na">enabled</span><span class="pi">:</span> <span class="no">true</span> |
| <span class="na">fallbackpolicy</span><span class="pi">:</span> |
| <span class="na">Consumer</span><span class="pi">:</span> |
| <span class="na">policy</span><span class="pi">:</span> <span class="s">throwexception</span> |
| </code></pre></div></div> |
| |
| <blockquote> |
| <p><strong>说明:</strong></p> |
| |
| <p>降级策略需要启用服务治理能力,对应的服务提供者的handler是<code class="language-plaintext highlighter-rouge">bizkeeper-provider</code>,服务消费者的handler是<code class="language-plaintext highlighter-rouge">bizkeeper-consumer</code>。如果省略了<code class="language-plaintext highlighter-rouge">Consumer:</code>/<code class="language-plaintext highlighter-rouge">Provider:</code>,策略将无法配置成功,此时服务治理将以默认配置生效。</p> |
| </blockquote> |
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