packets.go:32:unexpected EOF & Write TCP 192.168.3.90:3306:broken pipe

This is a created article in which the information may have evolved or changed. Golang the connection pool implemented here provides only the Setmaxopenconns and Setmaxidleconns methods for connection pooling configuration. One problem with the process is that the database itself has a time-out setting for the connection, and if the time-out is reached, the database will unilaterally disconnect, and then access with the connection in the connection pool will be an error.
Packets.go:32:unexpected EOF
Packets.go:118:write TCP 192.168.3.90:3306:broken Pipe

All errors above are the output of the go-sql-drive itself, and sometimes bad connection errors occur. After several requests, the connection pool will reopen the new connection. This is no problem.

http://blog.csdn.net/kenkao/article/details/47857795