Hi, A client woker auto stoppped, and has this error message, do u know why this happen? 16/05/18 03:34:37 INFO Worker: Master with url spark://master:7077 requested this worker to reconnect. 16/05/18 03:34:37 INFO Worker: Not spawning another attempt to register with the master, since there is an attempt scheduled already. 16/05/18 03:34:37 INFO Worker: Master with url spark://master:7077 requested this worker to reconnect. 16/05/18 03:34:37 INFO Worker: Not spawning another attempt to register with the master, since there is an attempt scheduled already. 16/05/18 03:34:37 ERROR Worker: Worker registration failed: Duplicate worker ID