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<h1 id="_1">故障注入</h1>
<p>用户在consumer端使用故障注入，可以设置发往指定微服务的请求的时延和错误及其触发概率。</p>
<h2 id="_2">注意事项</h2>
<p>延迟注入请求的延迟时间统一为毫秒。</p>
<h2 id="_3">配置说明</h2>
<p>故障注入配置在microservice.yaml文件中，相关配置项见下表。要开启服务消费者端的故障注入，还需要在处理链中配置消费端故障注入handler，配置示例如下：</p>
<pre><code class="language-yaml">servicecomb:
handler:
chain:
Consumer:
default: loadbalance,fault-injection-consumer
</code></pre>
<p>故障注入配置项说明</p>
<p>[scope]代表故障注入的生效范围，可配置值包括全局配置_global，或指定微服务的服务名[ServiceName]。</p>
<p>[protocol]代表使用的通信协议，可配置值包括rest或highway。</p>
<table>
<thead>
<tr>
<th align="left">配置项</th>
<th align="left">默认值</th>
<th align="left">取值范围</th>
<th align="left">是否必选</th>
<th align="left">含义</th>
<th align="left">注意</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">servicecomb.governance.Consumer.[scope].policy.fault.protocols.[protocol].delay.fixedDelay</td>
<td align="left">无</td>
<td align="left">(0,9223372036854775807]，长整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送延迟注入请求的延迟时间</td>
<td align="left">目前时间单位是毫秒</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[scope].policy.fault.protocols.[protocol].delay.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送延迟注入请求的触发概率</td>
<td align="left"></td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].policy.fault.protocols.[protocol].delay.fixedDelay</td>
<td align="left">无</td>
<td align="left">(0,9223372036854775807]，长整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应schema的延迟注入请求的延迟时间</td>
<td align="left">支持schema级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].policy.fault.protocols.[protocol].delay.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应schema的延迟注入请求的触发概率</td>
<td align="left">支持schema级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].operations.[operation].policy.fault.protocols.[protocol].delay.fixedDelay</td>
<td align="left">无</td>
<td align="left">(0,9223372036854775807]，长整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应operation的延迟注入请求的延迟时间</td>
<td align="left">支持operation级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].operations.[operation].policy.fault.protocols.[protocol].delay.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应operation的延迟注入请求的触发概率</td>
<td align="left">支持operation级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[scope].policy.fault.protocols.[protocol].abort.httpStatus</td>
<td align="left">无</td>
<td align="left">(100,999]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送错误注入请求的http错误码</td>
<td align="left"></td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[scope].policy.fault.protocols.[protocol].abort.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送错误注入请求的触发概率</td>
<td align="left"></td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].policy.fault.protocols.[protocol].abort.httpStatus</td>
<td align="left">无</td>
<td align="left">(100,999]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应schema的错误注入请求的http错误码</td>
<td align="left">支持schema级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].policy.fault.protocols.[protocol].abort.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应schema的错误注入请求的触发概率</td>
<td align="left">支持schema级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].operations.[operation].policy.fault.protocols.[protocol].abort.httpStatus</td>
<td align="left">无</td>
<td align="left">(100,999]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应operation的错误注入请求的http错误码</td>
<td align="left">支持operation级别的配置</td>
</tr>
<tr>
<td align="left">servicecomb.governance.Consumer.[ServiceName].schemas.[schema].operations.[operation].policy.fault.protocols.[protocol].abort.percent</td>
<td align="left">100</td>
<td align="left">(0,100]，整型</td>
<td align="left">否</td>
<td align="left">Consumer端发送到对应operation的错误注入请求的触发概率</td>
<td align="left">支持operation级别的配置</td>
</tr>
</tbody>
</table>
<h2 id="_4">示例代码</h2>
<pre><code>servicecomb:
governance:
Consumer:
_global:
policy:
fault:
protocols:
rest:
delay:
fixedDelay: 5000
percent: 10
</code></pre>
<pre><code>servicecomb:
governance:
Consumer:
ServerFaultTest:
schemas:
schema:
operations:
operation:
policy:
fault:
protocols:
rest:
abort:
httpStatus: 421
percent: 100
</code></pre>
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