supperchild123 opened a new issue #4071:
URL: https://github.com/apache/incubator-dolphinscheduler/issues/4071
dolphinsheduler1.2.0,任务显示提交成功，不运行。偶发一周平均出现一次，某一两个任务提交成功不运行，其它任务正常执行完成。。
整理报错日志和正常完成任务对比日志如下：
其中 233510d_par_action表master提交成功不运行，
233511d_par_action_full表master执行成功日志，进行比较。 详情可查看附件日志，谢谢。
主要报错信息如下：
####233510d_par_action表worker提交不运行的日志
C:\Users\XuJing\Desktop\ds-log\dolphinscheduler-worker.2020-11-03_00.0.log
(4 hits)
Line 9135: [INFO] 2020-11-03 00:22:57.655
org.apache.dolphinscheduler.common.queue.TaskQueueZkImpl:[211] - consume tasks:
[2_106884_2_233510_176226831,176226829,176226830,
2_106884_2_233511_176226831,176226829,176226830,
2_107020_2_233508_176226831,176226829,176226830],there still have 2 tasks need
to be executed
Line 9136: [ERROR] 2020-11-03 00:22:57.657
org.apache.dolphinscheduler.server.worker.runner.FetchTaskThread:[261] - task
instance is null. task id : 233510
Line 9137: [WARN] 2020-11-03 00:22:57.657
org.apache.dolphinscheduler.server.worker.runner.FetchTaskThread:[188] - remove
task queue : 2_106884_2_233510_176226831,176226829,176226830 due to
taskInstance is null
Line 9138: [INFO] 2020-11-03 00:22:57.657
org.apache.dolphinscheduler.common.queue.TaskQueueZkImpl:[278] - consume task
/dolphinscheduler/tasks_queue/2_106884_2_233510_176226831,176226829,176226830
ds配置任务流程图：
<img width="397" alt="1605511243(1)"
src="https://user-images.githubusercontent.com/74525943/99223434-72cbfb00-281f-11eb-93bc-336be3e1e935.png";>
详情请查看附件日志，谢谢。
[dolphinscheduler-worker.2020-11-03_00.0.log](https://github.com/apache/incubator-dolphinscheduler/files/5544639/dolphinscheduler-worker.2020-11-03_00.0.log)
[510&511对比.txt](https://github.com/apache/incubator-dolphinscheduler/files/5544637/510.511.txt)
[dolphinscheduler-master.2020-11-03_00.0.log](https://github.com/apache/incubator-dolphinscheduler/files/5544638/dolphinscheduler-master.2020-11-03_00.0.log)
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