During query execution, a certain kind of error may show up in the debug logs:

ERROR [o.n.b.f.StateMachineImpl] Client triggered an unexpected error [Neo.DatabaseError.General.UnknownError]: Failed to transmit operation result: Response write failure

"Response write failure" errors are emitted when a connection is terminated while results are being streamed to a driver. Accompanying this error might be other error messages around connection failures, or messages about clients disconnecting while a query is running, such as:

WARN [o.n.b.p.c.f.r.NetworkResponseHandler] Unable to send error back to the client. null

or errors warnings of increases in network aborts.

These errors may indicate network issues or could implicate problematic client-side code where a driver or a session or a transaction is terminated before all results are processed. If these errors occur often, it is best to review client-side code using the driver to ensure drivers, sessions, and transactions are not prematurely terminated.

 

See also: Explanation of logged error "Increase in network aborts detected"