背景
Apache DolphinScheduler 定时任务配置采用的 7 位 Crontab 表达式,分别对应秒、分、时、月天、月、周天、年
。
在团队日常开发工作中,工作流的定时调度一般不会细化到秒级别。但历史上出现过因配置的疏忽大意而产生故障时间,如应该配置每分钟执行的工作流被配置长了每秒执行,造成短时间内产生大量工作流实例,对 Apache DolphinScheduler 服务可用性和提交任务的 Hadoop 集群造成影响。
基于此,团队决定将 DolphinScheduler 中定时任务配置模块的 Crontab 表达式做限制,从平台侧杜绝此类事件发生。
方案
我们的方案是从前后端双方面限制 Crontab
表达式的第一位:
- 前端配置选择不提供“每一秒钟”选项
- 服务端接口判断第一位为 * 时,返回错误
前端修改
在前端项目中,秒、分、时 均为统一模版(CrontabTime),因此新增 dolphinscheduler-ui/src/components/crontab/modules/second.tsx
只保留两种模式:intervalTime
和 specificTime
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import _ from 'lodash'
import { defineComponent, onMounted, PropType, ref, toRefs, watch } from 'vue'
import { NInputNumber, NRadio, NRadioGroup, NSelect } from 'naive-ui'
import { useI18n } from 'vue-i18n'
import { ICrontabI18n } from '../types'
import { isStr, specificList } from '../common'
import styles fr