哥们，Flink这个异常大家是怎么处理的？Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
The last packet successfully received from the server was 995,464 milliseconds ago. The last packet sent successfully to the server was 995,475 milliseconds ago. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_272] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_272] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_272] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_272] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.send(NativeProtocol.java:593) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:654) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:986) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:921) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1165) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2064) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] … 43 more Caused by: java.net.SocketException: Connection timed out (Write failed) at java.net.SocketOutputStream.socketWrite0(Native Method) ~[?:1.8.0_272] at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111) ~[?:1.8.0_272] at java.net.SocketOutputStream.write(SocketOutputStream.java:155) ~[?:1.8.0_272] at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) ~[?:1.8.0_272] at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) ~[?:1.8.0_272] at com.mysql.cj.protocol.a.SimplePacketSender.send(SimplePacketSender.java:55) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.TimeTrackingPacketSender.send(TimeTrackingPacketSender.java:50) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.send(NativeProtocol.java:584) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:654) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:986) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:921) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1165) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2064) ~[pi-sku-status-1.0-SNAPSHOT.jar:?] … 43 more