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Ismael Juma commented on KAFKA-5595: ------------------------------------ I haven't checked this in detail, but a possibility: 1. There is an inflight response for client c 2. There is a disconnection and reconnection from client c causing us to lose the channel state 3. Client c sends another request 4. Because we lost the channel state and we don't drain the response queue on disconnections, we may allow 2 inflight responses for the same connection 5. Under the right set of circumstances, this could lead to the IllegalStateException reported Am I missing something? > Illegal state in SocketServer; attempt to send with another send in progress > ---------------------------------------------------------------------------- > > Key: KAFKA-5595 > URL: https://issues.apache.org/jira/browse/KAFKA-5595 > Project: Kafka > Issue Type: Bug > Reporter: Jason Gustafson > > I have seen this a couple times, but I'm not sure the conditions associated > with it. > {code} > java.lang.IllegalStateException: Attempt to begin a send operation with prior > send operation still in progress. > at > org.apache.kafka.common.network.KafkaChannel.setSend(KafkaChannel.java:138) > at org.apache.kafka.common.network.Selector.send(Selector.java:248) > at kafka.network.Processor.sendResponse(SocketServer.scala:488) > at kafka.network.Processor.processNewResponses(SocketServer.scala:466) > at kafka.network.Processor.run(SocketServer.scala:431) > at java.lang.Thread.run(Thread.java:748) > {code} > Prior to this event, I see a lot of this message in the logs (always for the > same connection id): > {code} > Attempting to send response via channel for which there is no open > connection, connection id 7 > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029)