title: Kafka standalone error: WARN Attempting to send response via channel for which there is no open connection, connection id 0 (kafka.network.Processor)
body: <p>I install kafka on a standalone server and try to stream data to mongodb.
  when start kafka service, bin/kafka-server-start.sh config/server.properties
  I had a warning: 
  WARN Attempting to send response via channel for which                                                                         there is no open connection, connection id 0 (kafka.network.Processor)</p>
  
  <p>Even though, there is no problem for data entered at producer and displayed at consumer.</p>
  
  <p>but I think this cause the data write to mongodb. I have no data write to mongodb after start data streaming.</p>
  
  <p>anyone can help with this issue? Thank you so much.</p>