Ekaterina Chernousova created KAFKA-13427:
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Summary: Max connections per listener are not blocked
Key: KAFKA-13427
URL: https://issues.apache.org/jira/browse/KAFKA-13427
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 2.7.0
Reporter: Ekaterina Chernousova
According to the documentation, new connections should be blocked if the
listener-level limit max connections (listener.name.example.max.connections) is
reached except it's an inter-broker listener.
[http://kafka.apache.org/documentation/#brokerconfigs_max.connections]
However, it seems an external listener is treated the same way as inter-broker
listener which is connections are being accepted and then some connections with
lower priority are closed.
When I was running some workloads with the
listener.name.example.max.connections limit in play, I didn't see any
toomanyconnections exceptions, from clients side it was connections were
established and disconnected later.
After checking the source code
[https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/network/SocketServer.scala#L715]
I don't see the listener-level max connections limit is being checked before
accepting a connection.
Setting a lower priority as I'm not sure if it's a documentation error or a
bug, please let me know if I missed something, thanks!
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