3-4 - Client sending request timed out

Possible Reason

1. The number of client connections is too high, the response is slow, and the request cannot be sent to the server in time.
2. Some reasons for the network.

Troubleshooting and resolution steps

1. Whether the network is normal.
2. You can use some third-party tools or jstack [PID] > jstack.log to analyze the stack information and locate it.