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https://issues.apache.org/jira/browse/KAFKA-5595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16087999#comment-16087999
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Ismael Juma commented on KAFKA-5595:
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[~rsivaram], this is a pretty rare case, we only saw two log entries for the
ISE after a lot of log entries for closed channels. Also, the kernel tends to
favouring reusing ports that have just been released (based on our experience
with port conflicts in tests). So, I think it seems possible, although I am not
sure.
> 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}
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