wangchangliang1008 opened a new issue #2231: [QUESTION] The same task start twice(任务重复启动) URL: https://github.com/apache/incubator-dolphinscheduler/issues/2231 **Installation machine distribution(安装机器分布)** master: master1、master2 worker: worker1、worker2 alertServer: dolphin1 apiServer: dolphin1 **Describe the question** I have created 200+ tasks to start at 1:00 a.m., and about 60 tasks will run repeatedly every day After observation, master1 and master2 will start a workflow instance respectively, and the interval between the two instances is 1-5 seconds (我创建了200+个任务在凌晨1点定时启动，每天大约会有60个任务重复运行 经过观察，master1和master2会分别会启动一个工作流实例，两个实例启动的间隔时间在1-5秒内) **Which version of DolphinScheduler:** -[1.2.0] **Additional context** Related log description(相关日志描述) in master1/master2 ：dophinscheduler-master-2020-03-XX_XX.0.log no error message find one command id:10021,type:SCHEDULER ... ... submit task : mytask state SUBMITED_SUCCESS complete, instance id 7867 state: RUNNING_EXEUTION **Requirement or improvement How can I ensure that only one instance is generated for each task？THX！
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