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https://issues.apache.org/jira/browse/KAFKA-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14586445#comment-14586445
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Gwen Shapira commented on KAFKA-2252:
-------------------------------------
Ick! I lost your fix while working on KAFKA-1928. So sorry!
I'll move it back to DEBUG, add another DEBUG for creating connections (for
symmetry), and I think we are good.
> Socket connection closing is logged, but not corresponding opening of socket
> ----------------------------------------------------------------------------
>
> Key: KAFKA-2252
> URL: https://issues.apache.org/jira/browse/KAFKA-2252
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Rosenberg
>
> (using 0.8.2.1)
> We see a large number of "Closing socket connection" logging to the broker
> logs, e.g.:
> {code}
> 2015-06-04 16:49:30,262 INFO [kafka-network-thread-27330-2]
> network.Processor - Closing socket connection to /1.2.3.4.
> 2015-06-04 16:49:30,262 INFO [kafka-network-thread-27330-0]
> network.Processor - Closing socket connection to /5.6.7.8.
> 2015-06-04 16:49:30,695 INFO [kafka-network-thread-27330-0]
> network.Processor - Closing socket connection to /9.10.11.12.
> 2015-06-04 16:49:31,465 INFO [kafka-network-thread-27330-1]
> network.Processor - Closing socket connection to /13.14.15.16.
> 2015-06-04 16:49:31,806 INFO [kafka-network-thread-27330-0]
> network.Processor - Closing socket connection to /17.18.19.20.
> 2015-06-04 16:49:31,842 INFO [kafka-network-thread-27330-2]
> network.Processor - Closing socket connection to /21.22.23.24.
> {code}
> However, we have no corresponding logging for when these connections are
> established. Consequently, it's not very useful to see a flood of closed
> connections, etc. I'd think we'd want to see the corresponding 'connection
> established' messages, also logged as INFO.
> Occasionally, we see a flood of the above messages, and have no idea as to
> whether it indicates a problem, etc. (Sometimes it might be due to an
> ongoing rolling restart, or a change in the Zookeeper cluster).
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