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--><h2 id="重要注意事项" tabindex="-1"><a class="header-anchor" href="#重要注意事项" aria-hidden="true">#</a> 重要注意事项</h2><ul><li>触发器从注册时开始生效，不对已有的历史数据进行处理。<strong>即只有成功注册触发器之后发生的写入请求才会被触发器侦听到。</strong></li><li>触发器目前采用<strong>同步触发</strong>，所以编写时需要保证触发器效率，否则可能会大幅影响写入性能。<strong>您需要自己保证触发器内部的并发安全性</strong>。</li><li>集群中<strong>不能注册过多触发器</strong>。因为触发器信息全量保存在 ConfigNode 中，并且在所有 DataNode 都有一份该信息的副本。</li><li><strong>建议注册触发器时停止写入</strong>。注册触发器并不是一个原子操作，注册触发器时，会出现集群内部分节点已经注册了该触发器，部分节点尚未注册成功的中间状态。为了避免部分节点上的写入请求被触发器侦听到，部分节点上没有被侦听到的情况，我们建议注册触发器时不要执行写入。</li><li>触发器将作为进程内程序执行，如果您的触发器编写不慎，内存占用过多，由于 IoTDB 并没有办法监控触发器所使用的内存，所以有 OOM 的风险。</li><li>持有有状态触发器实例的节点宕机时，我们会尝试在另外的节点上恢复相应实例，在恢复过程中我们会调用一次触发器类的 restore 接口，您可以在该接口中实现恢复触发器所维护的状态的逻辑。</li><li>触发器 JAR 包有大小限制，必须小于 min(<code>config_node_ratis_log_appender_buffer_size_max</code>, 2G)，其中 <code>config_node_ratis_log_appender_buffer_size_max</code> 是一个配置项，具体含义可以参考 IOTDB 配置项说明。</li><li><strong>不同的 JAR 包中最好不要有全类名相同但功能实现不一样的类</strong>。例如：触发器 trigger1、trigger2 分别对应资源 trigger1.jar、trigger2.jar。如果两个 JAR 包里都包含一个 <code>org.apache.iotdb.trigger.example.AlertListener</code> 类，当 <code>CREATE TRIGGER</code> 使用到这个类时，系统会随机加载其中一个 JAR 包中的类，最终导致触发器执行行为不一致以及其他的问题。</li></ul></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/1.1/docs/zh/UserGuide/Trigger/Notes.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!----></a></div><div class="meta-item git-info"><!----><!----></div></footer><nav class="page-nav"><a href="/zh/UserGuide/V1.1.x/Trigger/Trigger-Management.html" class="nav-link prev" aria-label="管理触发器"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->管理触发器</div></a><a href="/zh/UserGuide/V1.1.x/Trigger/Configuration-Parameters.html" class="nav-link next" aria-label="配置参数"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">配置参数<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/1.1</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2023 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"> We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. </p></footer></div><!--]--><!--]--><!----><!--]--></div>
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