garyganyang commented 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:
```
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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