qiaozhanwei commented on issue #915: [BUG] When the worker starts, it does not need to load and run the deleted task instance URL: https://github.com/apache/incubator-dolphinscheduler/issues/915#issuecomment-536276734 1, first delete the process instance will delete the corresponding task, the database level cascading delete 2, once the process instance and task instance are deleted, even if the task has reached the zk queue, it will not be scheduled to execute. 3, for non-final process instances and task instances, the service will be fault tolerant when restarting 1，首先删除流程实例会把对应的任务删除，数据库级别的级联删除 2，一旦流程实例和任务实例删除了，就算任务已经到了zk queue中，也不会调度执行 3，对非终态的流程实例和任务实例，服务在重新启动的时候会进行容错
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