[GitHub] [dolphinscheduler] garyganyang edited a comment on issue #5528: [Bug][server] task instance can not run.

[GitBox <gi...@apache.org>]

garyganyang edited a comment on issue #5528:
URL: https://github.com/apache/dolphinscheduler/issues/5528#issuecomment-868977662


   im running 1.3.6, while i run python with threading, something like below:
   ```
   java version "1.8.0_231"
   Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
   ```
   ```
   import threading
   thread_list = []
   t = threading.Thread(target=predict_and_save, args=[mysql_conn, sql, df, 0, mid - 1])
   thread_list.append(t)
   t = threading.Thread(target=predict_and_save, args=[mysql_conn, sql, df, mid - 1, len(df) - 1])
   thread_list.append(t)
   for t in thread_list:
       t.setDaemon(True)
       t.start()
   for t in thread_list:
       t.join()
   ```
   and i encounter the same exception
   
   [ERROR] 2021-06-26 17:39:28.687  - [taskAppId=TASK-7-112-2132]:[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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