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              <time title="创建时间：2021-10-17 14:10:18 / 修改时间：22:34:07" itemprop="dateCreated datePublished" datetime="2021-10-17T14:10:18+08:00">2021-10-17</time>
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          <p>码农一个，开发过cdn系统，写过游戏，现在在送外卖。</p>
<h2 id="学历"><a href="#学历" class="headerlink" title="学历"></a>学历</h2><p>本硕：关山口职业技术学校 计算机</p>
<h2 id="技能"><a href="#技能" class="headerlink" title="技能"></a>技能</h2><p>熟悉C／C++<br>熟悉基本数据结构，算法<br>熟悉 linux、微服务、分布式系统开发<br>熟悉Mysql、kafka、redis使用</p>
<h2 id="经历与项目"><a href="#经历与项目" class="headerlink" title="经历与项目"></a>经历与项目</h2><p>做过CDN研发<br>写过游戏后台<br>目前在送外卖</p>
<h2 id="兴趣爱好"><a href="#兴趣爱好" class="headerlink" title="兴趣爱好"></a>兴趣爱好</h2><p>coding<br>旅游<br>跑步</p>

      
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              <time title="创建时间：2021-10-17 14:10:18 / 修改时间：22:56:05" itemprop="dateCreated datePublished" datetime="2021-10-17T14:10:18+08:00">2021-10-17</time>
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          <h1 id="限流的作用"><a href="#限流的作用" class="headerlink" title="限流的作用"></a>限流的作用</h1><p><strong>限流定义：</strong>限制「速率」，或从业务层限制「总数」，被限流的请求，直接进入「降级」fallback 流程(fallback与业务相关)；</p>
<p><strong>使用场景：</strong></p>
<ol>
<li><p>应对突发流量，避免系统被压垮（全局限流和IP限流）。</p>
</li>
<li><p>防刷，防止机器人脚本等频繁调用服务（userID限流和IP限流）</p>
</li>
</ol>
<p><strong>对于应对突发流量避免系统压垮这个情景，可以在以下几方面做具体限流</strong></p>
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<li>业务系统入口(入流量)，比如秒杀活动等系统做限流</li>
<li>系统依赖的外部系统(出流量)，比如某个渠道的支付QPS只有300，我们在访问它的服务对这个渠道做限流(防止雪崩)</li>
<li>核心子系统，比如交易</li>
</ol>
<h1 id="限流的行为"><a href="#限流的行为" class="headerlink" title="限流的行为"></a>限流的行为</h1><p>在接口的请求数达到限流的条件时触发的操作，一般可进行以下行为。</p>
<p>拒绝服务：把多出来的请求拒绝掉</p>
<p>服务降级：关闭或是把后端服务做降级处理。这样可以让服务有足够的资源来处理更多的请求</p>
<p>特权请求：资源不够了，我只能把有限的资源分给重要的用户</p>
<p>延时处理：一般会有一个队列来缓冲大量的请求，这个队列如果满了，那么就只能拒绝用户了，如果这个队列中的任务超时了，也要返回系统繁忙的错误了</p>
<p>弹性伸缩：用自动化运维的方式对相应的服务做自动化的伸缩</p>
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