KEN-LJQ commented on issue #2231: [QUESTION] The same task start twice(任务重复启动) URL: https://github.com/apache/incubator-dolphinscheduler/issues/2231#issuecomment-605553286 In our situation, the version is [1.1.0], and cluster has 2 master and 3 worker We found that the duplicate process instance 1. Has two row in table `t_tds_process_instance` with different id 2. Those process are shedule by two different master, and in master log, we found this log each `org.apache.dolphinscheduler.server.master.runner.MasterSchedulerThread:[114] - find one command: id: xxxx, type: SCHEDULER`, the command id is different, we belive two command had generated 3. we also check the Quartz with table `QRTZ_JOB_DETAILS`, `QRTZ_CRON_TRIGGER`, `QRTZ_TRIGGER`, and only one record can found So, we think the the problem may happen when the schedule command is generate, but master log can not provide any more information about the job quartz schedule. If you need any more info, we are happy to share
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