Yanwenjingcn opened a new issue #5722:
URL: https://github.com/apache/dolphinscheduler/issues/5722
**Which version of Dolphin Scheduler:**
-[1.3.6]
The following errors often appear in the log，It will not affect the success
or failure of the task, but will affect the printing of the log
[ERROR] 2021-06-30 07:02:36.924 -
[taskAppId=TASK-78-10550712-14319202]:[384] - null
java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at java.lang.String.join(String.java:2503)
at
org.apache.dolphinscheduler.server.worker.task.AbstractTask.logHandle(AbstractTask.java:129)
at
org.apache.dolphinscheduler.server.worker.task.AbstractCommandExecutor.flush(AbstractCommandExecutor.java:557)
at
org.apache.dolphinscheduler.server.worker.task.AbstractCommandExecutor.lambda$parseProcessOutput$1(AbstractCommandExecutor.java:378)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
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