xingchun-chen opened a new issue #2350: [BUG] master fault tolerance error URL: https://github.com/apache/incubator-dolphinscheduler/issues/2350 1. Start one master1 and two workers 2. Task setting timing, executed once every 1 minute, online timing 3. There are 3 workflow instances running on the master1 service, and the task shell_task_1 of the workflow instance is also in the "running" state. 4. Start the master2 service, the host of the workflow instance changes from master1 to master2, and the task shell_task_1 also starts fault-tolerant processing, as shown in the following figure, and finally shell_task_1 is executed 3 times: =============================================== 1.启动一台master1 ， 2台worker 2.任务设置定时，1分钟执行一次，上线定时 3.有3个工作流实例在master1服务上运行，其中工作流实例的任务shell_task_1也处于“正在运行”状态 4.启动master2服务，工作流实例的host从master1变为master2，任务shell_task_1也开始容错处理，如下图所示，最终shell_task_1被执行3次： ===============================================    **Which version of Dolphin Scheduler:** -[refactor-worker]
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