Intermittent connection to?


We just upgraded our cluster from 3.1.11 to 3.3.2, everything look smooth except I noticed there are tons of this error in server.log on the coordinator nodes. This message(s) doesn’t really tell anything to us, which side that went wrong.

2019-09-19 08:36:33,155 [qtp1993004305-254] ERROR c.d.dac.server.socket.SocketServlet - Failure in web socket handling. Disconnected
at ~[websocket-common-9.4.15.v20190215.jar:9.4.15.v20190215]
at org.eclipse.jetty.websocket.common.WebSocketSession.onClosed( ~[websocket-common-9.4.15.v20190215.jar:9.4.15.v20190215]
at [jetty-io-9.4.15.v20190215.jar:9.4.15.v20190215]
at [jetty-io-9.4.15.v20190215.jar:9.4.15.v20190215]
at [jetty-io-9.4.15.v20190215.jar:9.4.15.v20190215]
at$ [jetty-io-9.4.15.v20190215.jar:9.4.15.v20190215]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob( [jetty-util-9.4.15.v20190215.jar:9.4.15.v20190215]
at org.eclipse.jetty.util.thread.QueuedThreadPool$ [jetty-util-9.4.15.v20190215.jar:9.4.15.v20190215]
at [na:1.8.0_222]

Any idea?


The error is about sockets being closed unexpectedly, which is not a problem since it can happen when users close browsers for example. We have an internal ticket to stop logging websocket exceptions since its noise that isn’t helpful.

1 Like

Thanks for the response.

So this can be safely ignored.
Got it!

Correct, they can be ignored.